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Data Mining in Genomics & Proteomics
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Family Medicine & Medical Science Research
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International Journal of Advance Innovations, Thoughts & Ideas
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Obesity & Weight Loss Therapy
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OMICS Journal of Radiology
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Pain & Relief 
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Reproductive System & Sexual Disorders
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Sleep Disorders & Therapy
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Spine
Stem Cell Research & Therapy
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Telecommunications System & Management
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Clinical
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Data Mining in Genomics & Proteomics
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Health & Medical Informatics
Metabolomics:Open Access
OMICS Journal of Radiology
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political Sciences & public affairs
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Socialomics
Tourism & Hospitality

Life  Sciences
Advanced Techniques in Biology & Medicine
Advancements in Genetic Engineering
Advances in Crop Science & Technology
Advances in Dairy Research
Aging Science
Agrotechnology
Air & Water Borne Diseases
Antivirals & Antiretrovirals
Autism-Open Access
Bacteriology & Parasitology
Biochemistry & Physiology: Open Access
Biochemistry and Analytical Biochemistry
Bioenergetics
Bioengineering & Biomedical Science
Biofertilizers & Biopesticides
Biological Systems- Open Access
Biometrics & Biostatistics
Biomolecular Research & Therapeutics
Bioremediation & Biodegradation
Biosafety
Biosafety & Health Education
Biosensors & Bioelectronics
Biotechnology & Biomaterials
Bioterrorism & Biodefense
Cell & Developmental Biology
Current Synthetic & Systems Biology
Entomology, Ornithology & Herpetology
Enzyme Engineering
Fermentation Technology
Fertilization: In Vitro - IVF-Worldwide
Fisheries and Aquaculture Journal
Forest Research: Open Access
Fungal Genomics and Biology
Gene Technology
Glycobiology
Horticulture
Homeopathy & Ayurvedic Medicine
Marine Science: Research & Development
Membrane Science & Technology
Microbial & Biochemical Technology
Molecular Biology
Molecular Imaging & Dynamics
Nanomedicine & Biotherapeutic Discovery
Nanomedicine & Nanotechnology
Nutrition & Food Sciences
Plant Pathology & Microbiology
Primatology
Probiotics & Health
Rice Research: Open Access
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Sociology and Criminology-Open Access
Tissue Science & Engineering
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Transcriptomics: Open Access
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Advances in Automobile Engineering
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Civil & Environmental Engineering
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Electrical & Electronics
Food Processing & Technology
Geology and Geosciences
Geophysics & Remote sensing
Industrial Engineering & Management
Information Technology & Software Engineering
International Journal of Advance Innovations, Thoughts & Ideas
Irrigation and Drainage Systems Engineering
Material Sciences & Engineering
Powder Metallurgy & Mining
Telecommunications System & Management
Textile Science & Engineering

Medical Sciences
Addiction Research & Therapy
Allergy & Therapy
Alternative & Integrative Medicine
Alzheimer’s Disease & Parkinsonism
Anaplastology
Anatomy & Physiology
Ancient Diseases & Preventive Remedies
Andrology
Arthritis
Autacoids
Bioceramics Development and Applications
Biology and Medicine
Blood & Lymph
Blood Disorders & Transfusion
Bone Marrow Research
Brain Disorders & Therapy
Cardiovascular Diseases & Diagnosis
Cloning & Transgenesis
Community Medicine & Health Education
Dentistry
Depression and Anxiety
Diabetes & Metabolism
Emergency Medicine
Endocrinology & Metabolic Syndrome
Epidemiology: Open Access
Family Medicine & Medical Science Research
Gastrointestinal & Digestive System
General Medicine
General Practice
Genetic Syndromes & Gene Therapy
Gynecology& Obstetrics
Global Economics
Gerontology & Geriatrics Research
Hematology & Thromboembolic Diseases
Hair: Therapy & Transplantation
Health Care : Current Reviews
Hereditary Genetics
Human Genetics & Embryology
Hypertension-Open Access
International Journal of Genomic Medicine
Internal Medicine
International Journal of Physical Medicine & Rehabilitation
Leukemia
Liver
Medical & Surgical Urology
Medical Diagnostic Methods
Medical Microbiology & Diagnosis
Metabolic Syndrome
Molecular Biology
Molecular Biomarkers & Diagnosis
Molecular and Genetic Medicine
Mycobacterial Diseases
Neonatal Biology
Nephrology & Therapeutics
Neurological Disorders
Novel Physiotherapies
Nuclear Medicine & Radiation Therapy
Nursing & Care
Nutritional Disorders & Therapy
Obesity & Weight Loss Therapy
Occupational Medicine & Health Affairs
Oral Health and Dental Management
Oral Hygiene & Health
Orthopedic & Muscular System
Osteoporosis & Physical Activity
Otolaryngology
Pain & Relief
Palliative Care & Medicine
Pancreatic Disorders & Therapy
Pediatrics & Therapeutics
Primary Health Care: Open Access
Psychological Abnormalities in Children
Psychology & Psychotherapy
Reproductive System & Sexual Disorders
Rheumatology: Current Research
Sleep Disorders & Therapy
Spine
Sports Medicine & Doping Studies
Steroids & Hormonal Science
Surgery: Current Research
Thyroid Disorders & Therapy
Translational Medicine
Trauma & Treatment
Tropical Medicine and Surgery
Vascular Medicine & surgery
Women's Health Care
Yoga & Physical Therapy
» Conferences
 
Upcoming Conferences

2nd International Conference and Exhibition on Pathology, August 05-07, 2013 Las Vegas, USA

International Conference on Integrative Biology Summit, August 05-07, 2013 Las Vegas, USA

2ndInternational Conference on Translational Medicine, August 05-07, 2013 Chicago, USA


International Conference and Exhibition on Predictive, Preventive and Personalized Medicine & Molecular Diagnostics, August 05-07, 2013 Chicago, USA
2nd International Conference on Biodiversity & Sustainable Energy Development, August 12-14, 2013 Raleigh, USA

International Conference on Genetic Engineering & Genetically Modified Organisms, August 12-14, 2013 Raleigh, USA

4th World Congress on Diabetes & Metabolism, August 14-16, 2013 Chicago, USA

International Conference on Radiology and Imaging, August 14-16, 2013 Chicago, USA

2nd International Conference and Exhibition on Orthopedics & Rheumatology, August 19-21, 2013 Las Vegas, USA

International Conference on Dental & Oral Health, August 19-21, 2013 Las Vegas, USA

International Conference and Exhibition on Physical Medicine & Rehabilitation, August 19-21, 2013 Las Vegas, USA

International Conference on Molecular Epidemiology and Evolutionary Genetics, August 21-23, 2013 Miami, USA

International Conference on Oceanography, August 21-23, 2013 Orlando, USA

International Conference on Biodefense & Natural Disasters, August 21-23, 2013 Miami, USA

World Congress on Endocrinology, August 26-28, 2013 Raleigh, USA

2nd International Conference on Hydrology and Groundwater Expo, August 26-27, 2013 Raleigh, USA

2nd International Conference on Tissue Science & Regenerative Medicine, August 26-28, 2013 Raleigh, USA

International Conference on Omics Studies, September 04-06, 2013 Orlando-FL, USA

International Symposia on Entomology , September 04-06, 2013 Miami, USA

2nd International Conference on Surgery & Anesthesia, September 16-18, 2013 Las Vegas, USA

2nd International Conference on Clinical Microbiology & Microbial Genomics , September 16-18, 2013 Las Vegas, USA

2nd International Conference and Exhibition on Biowaivers & Biosimilars, September 23-25, 2013 Raleigh, USA

4th World Congress on Biotechnology, September 23-25, 2013 Raliegh, USA

International Conference on Hematology & Blood Disorders, September 23-25, 2013 Raliegh, USA

International Conference on Psychology, Autism and Alzheimer's Disease, September 30-October 01, 2013 San Antonio, USA

International Conference and Exhibition on Mechanical & Aerospace Engineering, September 30-October 02, 2013 San Antonio, USA

2nd International Summit on Toxicology, October 07-09, 2013 Las Vegas, USA

International Conference and Exhibition on Biochemical & Molecular Engineering, October 07-09, 2013 San Antonio, USA

International Conference and Exhibition on Lasers, Optics & Photonics, October 07-09, 2013 San Antonio, USA

2nd International Conference and Exhibition on Materials Science & Engineering, October 07-09, 2013 Las Vegas, USA

2nd International Conference on Clinical & Cellular Immunology, October 15-17, 2013 Las Vegas, USA

2nd International Conference on Medicinal Chemistry & Computer Aided Drug Designing, October 15-17, 2013 Las Vegas, USA

4th International Conference and Exhibition on Analytical & Bioanalytical Techniques, October 15-17, 2013 Las Vegas, USA

International Conference and Exhibition on Pharmacognosy, Phytochemistry and Natural Products, October 21-23, 2013 Hyderabad, India

3rd World Congress on Cancer Science & Therapy, October 21-23, 2013 California, USA

3rd International Conference on Pharmaceutical Regulatory Affairs, October 21-23, 2013 California, USA

2nd International Conference and Exhibition on Cell & Gene Therapy October 23-25, 2013 Orlando, USA

2nd International Conference and Exhibition on Probiotics & Functional Foods, October 23-25, 2013 Orlando, USA

International Conference on HIV/AIDS, STDs, & STIs October 24-25, 2013 Orlando-FL, USA

International Conference on Fermentation Technology, Bioprocess and Cell Culture, October 28-30, 2013 Kansas City, USA

2nd International Conference and Exhibition on Food Processing & Technology, October 28-30, 2013 Kansas City, USA

International Conference on Functional and Comparative Genomics & Pharmacogenomics, November 12-14, 2013 Chicago, USA

2nd International Conference and Exhibition on Cosmetology & Trichology, November 12-14, 2013 Chicago, USA

2nd International Summit on GMP, QA & QC, November 12-14, 2013 Chicago, USA

2nd International Conference and Exhibition on Pharmacovigilance & Clinical Trials, November 18-19, 2013 San Antonio, USA

International Summit on Clinical Pharmacy & Dispensing, November 18-20, 2013 San Antonio, USA

World Congress on Petrochemistry and Chemical Engineering, November 18-20, 2013 San Antonio, USA

3rd World Congress on Virology, November 20-22, 2013 Baltimore, USA

International Congress on Bacteriology and Infectious diseases, November 20-22, 2013 Baltimore, USA

3rd World Congress on Cell Science & Stem Cell Research, November 20-22, 2013 San Antonio, USA

2nd International Conference and Exhibition on Obesity & Weight Management, December 02-04, 2013 Las Vegas, USA

International Conference on Nursing & Emergency Medicine, December 02-04, 2013 Las Vegas, USA

3rd International Conference on Nanotek & Expo, December 02-04, 2013 Las Vegas, USA

International Conference and Exhibition on Traditional & Alternative Medicine, December 09-11, 2013 Hyderabad, India

2nd International Conference on Agricultural & Horticultural Sciences, February 03-05, 2014 Hyderabad, India





Previous Conferences Organized/Co-organized
2nd International Conference on Nephrology & Therapeutics, July 29-31, 2013 Las Vegas, USA
3rd International Conference on Vaccines & Vaccination, July 29-31, 2013 Las Vegas, USA

2nd International Conference on Earth Science & Climate Change, July 22-24, 2013 Las Vegas, USA

2nd International Conference and Exhibition on Addiction Research & Therapy, July 22-24, 2013 Las Vegas, USA

International Conference on Animal & Dairy Sciences, July 23-24, 2013 Las Vegas, USA

3rd International Conference on Proteomics & Bioinformatics, July 15-17, 2013 Philadelphia Center City, USA

2nd International Conference and Exhibition on Nutritional Science & Therapy, July 15-17, 2013 Philadelphia, USA

4th International Conference on Biomarkers & Clinical Research, July 15-17, 2013 Philadelphia, USA


2nd International Conference and Exhibition on Biosensors & Bioelectronics, June 17-19, 2013 Chicago, USA

2nd International Conference and Exhibition on Neurology & Therapeutics, June 17-19, 2013 Chicago, USA

2nd International Conference on Gastroenterology & Urology, June 10-12, 2013 Chicago, USA

2nd International Conference and Exhibition on Biometrics & Biostatistics, June 10-12, 2013 Chicago, USA

4th World Congress on Bioavailability & Bioequivalence, May 20-22, 2013 Beijing, China

3rd International Conference on Clinical & Experimental Ophthalmology, April 15-17, 2013 Chicago, USA

3rd International Conference on Clinical & Experimental Cardiology, April 15-17, 2013 Chicago, USA

3rd International Conference on Clinical & Experimental Dermatology, April 15-17, 2013 Chicago, USA

2ndInternational Conference and Exhibition on Metabolomics & Systems Biology, April 08-10, 2013 Chicago, USA

3rd International Conference and Exhibition on Pharmaceutics & Novel Drug Delivery Systems, April 08-10, 2013 Chicago, USA

International Exhibition and Conference on Water Technologies, Environmental Technologies & Renewable Energy, February 13-14, 2013 Mumbai, India

International Conference and Exhibition on Obesity and Weight Management, December 03-05, 2012 DoubleTree by Hilton Philadelphia, USA

International Summit on GMP & GCP: USA, Europe, Japan, Asia Pacific, December 03-05, 2012 DoubleTree by Hilton Philadelphia Center City, USA

International Conference on QA, QC and Validation, December 03-05, 2013 DoubleTree by Hilton Philadelphia Center City, USA

2nd International Conference on Nanotek and Expo, December 03-05, 2012 at DoubleTree by Hilton Philadelphia Center City, USA

International Conference on Hair Transplantation & Trichology November 26-28, 2012 San Antonio, USA

International Conference on Anesthesia & Perioperative Care November 26-28, 2012 San Antonio, USA

International Toxicology Summit & Expo November 26-28, 2012 Hilton San Antonio Airport, USA

International Conference and Exhibition on Surgery & Transplantation November 26-28, 2012 San Antonio, USA

International Conference and Exhibition on Food Processing and Technology November 22-24, 2012 Hyderabad, India

3rd International Conference and Exhibition on Analytical & Bioanalytical Techniques November 22-24, 2012 Hyderabad International Convention Center, India

2ndInternational Conference and Exhibition on Pharmaceutical Regulatory Affairs November 23-24, 2012 HICC Hyderabad, India

International Conference and Exhibition on Cosmetology & Cosmetics November 23-24, 2012 HICC Hyderabad, India

Global Biofuels and Bioproducts Summit November 19-21, 2012 San Antonio, USA

International Conference on Genetic Syndromes & GeneTherapy November 19-21, 2012 at Hilton San Antonio Airport, USA

International Conference and Exhibition on Probiotics-2012, November 19–21, 2012, Hilton San Antonio Airport, USA

2nd World Congress on Cell Science & Stem Cell Research November 12-14, 2012 San Antonio, USA

International Conference on Clinical Microbiology & Microbial Genomics November12-14, 2012 San Antonio, USA

International Conference on Regenerative and Functional Medicine November 12-14, 2012 San Antonio, USA

International Conference and Exhibition on Computer Aided Drug Design & QSAR October 29-31, 2012 Chicago, USA
International Conference on Pulmonary & Respiratory Medicine August 27-29, 2012 Philadelphia, USA.

International Expo & Conference on Analytrix & HPLC October 22-24, 2012 Hilton Northbrook, Chicago, USA

International Conference and Expo on Material science and Engineering October 22-24, 2012 DoubleTree by Hilton Chicago-North Shore, USA

International Conference on Clinical and Cellular Immunology October 22-24, 2012 DoubleTree by Hilton Chicago-North Shore, USA

International Conference on Forensic Research & Technology October 15-17, 2012 DoubleTree by Hilton Chicago-North Shore, USA

International Conference and Exhibition on Otolaryngology October 15-17, 2012 DoubleTree by Hilton Chicago-North Shore, USA

International conference on Biothreats and Biodefense October 15-17, 2012 DoubleTree by Hilton Chicago-North Shore, USA

International Conference on Tissue Science and Engineering October 1-3, 2012 DoubleTree by Hilton Chicago-North Shore, USA

International conference and Exhibition on Pharmacovigilance and Clinical Trials October 1-3, 2012 DoubleTree by Hilton Chicago-North Shore, USA

International Conference on Emerging Cell Therapies October 1-3, 2012 DoubleTree by Hilton Chicago-North Shore, USA

Omics International Integrative Biology summit October 1-3, 2012 DoubleTree by Hilton Chicago-North Shore, USA

3rdWorld Congress on Diabetes & Metabolism September 24-26, 2012 Marriott Convention Center, Hyderabad, India

2ndInternational Conference on Pediatrics & Gynecology September 24-26, 2012, Hyderabad Marriott Hotel & Convention Centre , Hyderabad, India

International Conference on Translational medicine September 17-19,2012 Holiday Inn San Antonio, Texas, USA

3rd World Congress on Biotechnology September 13-15, 2012 HICC, Hyderabad, India

International Conference on Biodiversity & Sustainable Energy Development September 14-15, 2012 Hyderabad, India

International Conference on Hotel and Business Management September 14-15, 2012 Hyderabad International Convention Center, India

International Conference on Agricultural & Horticultural Sciences September 14-15, 2012 Hyderabad International Convention Center, India

International Conference on Hydrology and Groundwater Expo September 10-12, 2012 San Antonio, USA

2nd World Congress on Cancer Science & Therapy September 10-12, 2012 San Antonio, USA

International Conference and Exhibition on Biowaivers and Biosimilars September 10-12, 2012 San Antonio, TX, USA

International Conference on Central Nervous System September 5-7, 2012 Double by Hilton Philadephia, USA.

International Conference on Occupational Health and Safety Summit September 5-7, 2012 Philadelphia, USA

International Conference and Exhibition on pathology August 27-29, 2012 Philadelphia, USA

International Conference and Exhibition on Nutritional Science & Therapy-2012 August 27-29, 2012 Philadelphia, USA

International Conference and Exhibition on Addiction Research & Therapy Aug 20-22, 2012 Las Vegas, USA

2nd World Congress on Virology Aug 20-22, 2012 Las Vegas, USA

International Conference and Exhibition on Nephrology and Therapeutics August 20-22, 2012, Chicago Chicago, USA

2nd International Conference on Vaccines & Vaccination August 20-22, 2012 at Chicago, USA.

World Congress on Earth Science & Climate Change 21–22 Aug 2012, Chicago, USA 20-22 Aug 2012 Las Vegas, USA

International Conference and Exhibition on Orthopedics Aug 13th–15th, 2012 Chicago, USA

International Conference and Exhibition on Rheumatology and Therapeutics Aug 14–15, 2012 at Chicago, USA

3rd International Conference on Biomarkers & Clinical Research July 2-4, 2012 Las Vegas, USA

2nd International Conference on Proteomics & Bioinformatics July 2-4, 2012 Las Vegas, USA

International Conference and Exhibition on Neurology & Therapeutics May 14-16, 2012 Las Vegas, USA

International Conference and Exhibition on Biosensors & Bioelectronics May 14-16, 2012 Las Vegas, USA.

3rd World Congress on Bioavailability & Bioequivalence: Pharmaceutical R & D Summit March 26-28, 2012 Marriott Hotel, Hyderabad, India

International Conference & Exhibition on Nanotechnology and Nanomedicine March 12-14, 2012 Omaha, USA

World Congress on Gastroenterology and Urology March 12-14, 2012 Omaha, USA

International Conference & Exhibition on Biometrics & Biostatistics March 5-7, 2012 Omaha, USA

2nd World Congress on Clinical & Experimental Dermatology March 5-7, 2012 Omaha Marriott, USA

2nd World Congress on Clinical & Experimental Cardiology March 5-7, 2012 Omaha Marriott, USA

2nd World Congress on Clinical & Experimental Ophthalmology March 5-7, 2012 Omaha Marriott, USA

International Conference and Exhibition on Metabolomics & Systems Biology February 20-22, 2012 San Francisco, USA

2nd World Congress on Pharmaceutics & Novel Drug Delivery Systems February 20-22, 2012 San Francisco, USA

2nd world Congress on Analytical and Bioanalytical Techniques 16-17 December 2011San franscico, USA.

2nd World Congress on Diabetes & Metabolism 6-8 December 2011 Philadelphia, USA.

International Conference on Pediatrics & Gynecology 6-8 December 2011 Philadelphia, USA.

International Conference and Exhibition on Cell Science & Stem Cell Research 29 Nov-1 Dec 2011 Philadelphia, USA.

2nd World Congress on Biotechnology 29 Nov -1 Dec 2011 Philadelphia, USA.

International Conference and Exhibition on Vaccines & Vaccination 22-24 November 2011 Philadelphia, USA.

2nd World Congress on Biomarkers & Clinical Research 12-14 September 2011 Baltimore, USA.

International Conference and Exhibition on Virology 5-7 September 2011 Baltimore, USA.

International Conference and Exhibition on Pharmaceutical Regulatory Affairs 6-7 September 2011 Baltimore, USA.

International Conference and Exhibition on Cancer Science & Therapy 15-17 August 2011 Las Vegas, USA.

International Conference on Clinical Research: Dermatology, Ophthalmology and Cardiology 5-6 July 2011 San Francisco, USA.

International Conference & Exhibition on Proteomics & Bioinformatics 6-8 June 2011 HICC, Hyderabad, India.

International Conference & Exhibition on Pharmaceutical Biotechnology 6-8 June 2011 HICC, Hyderabad, India.

2nd World Congress on Bioavailability & Bioequivalence: Pharmaceutical R & D Summit 6-8 June 2011 Las Vegas, USA.

International Conference on Pharmaceutics & Novel Drug Delivery Systems 7-8 June Las Vegas, USA.

World Congress on Biotechnology 21-23 March 2011 Hyderabad, India.

International Conference on Diabetes and Metabolism 13-14 December 2010 Santa Clara, USA.

International Conference on Biomarkers & Clinical Research 22-23 November 2010 Santa Clara, USA

International Conference and Exhibition on Analytical and Bioanalytical Techniques: Pharmaceutical R & D Summit 01 - 03 November 2010 Hyderabad, India

International Conference & Exhibition on Bioequivalence & Bioavailability 2010, Pharmaceutical R & D Summit March 01-03, 2010.

Integrating Glycomics with other Omics in Cancer Detection and Diagnosis, January 19-20, 2010, Stanford University School of Medicine.

3rd World Congress of Gene-2009, December 1-7, 2009.

7th Annual World Congress of International Drug Discovery Science & Technology, October 22-25.

2nd WSA-2009, July 18-20, 2009

1st CCSB-2009, February 16-17, 2009

2nd PRICPS-4th AOHUPO, June 22-26, 2008

95th ISCA, January 5-8, 2008
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Review Article Open Access
 
Periodontitis and Preterm Low Birth Weight: Is there any Association?
1Faculty of Medicine, Comenius University in Bratislava, Bratislava, Slovakia Trapezanlidis Michaela1*, 2Head of the Department of Dentistry, Slovak Medical University, Bratislava, Slovakia Straka Michal2 and 3Pavol Jozef Šafárik University in Košice, Košice, Slovakia Kotrán Milan3
 
Corresponding Author : Trapezanlidis Michaela
Faculty of Medicine
Comenius University in Bratislava
Bratislava, Slovakia
Email: trapezanlidismichaela@gmail.com
 
Received October 08, 2011; Accepted December 14, 2011; Published December 16, 2011
 
Citation: Michaela T, Michal S, Milan K (2011) Periodontitis and Preterm Low Birth Weight: Is there any Association? Reproductive Sys Sexual Disord S2:001. doi: 10.4172/2161-038X.S2-001
 
Copyright: © 2011 Sahli E, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
 
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Abstract
 

The aim of this paper is to indicate possible etiopathogenetic associations between destructive periodontitis in pregnant women and preterm low birth-weight deliveries. Strong pro-inflammatory potential of chronic periodontitis may attack the whole organism of the future mothers. The destructive inflammatory character of various forms of periodontitis with its bacterial, cytokinal and proteolytic expressions can raise the pro-inflammatory and proteolytic status in the fetoplacental unit and cause premature rupture of chorioplacental membranes. In our study, there are presented possible associations of both states manifested through bacterial, mediatory, genetic, proteolytic and oxidative mechanisms. The majority of other papers report associations of individual ethiopathogenetic mechanisms, by means of which chronic destructive inflammation of periodontium negatively afflicts the feto-placental structures. In spite of wide research in this field, causal associations have not yet been unanimously proven.

 
Introduction
 
There are two major types of periodontal diseases: gingivitis and periodontitis. While gingivitis is inflammation afflicting the gingival part of the periodontium, periodontitis is a bacterial disease manifested with presence of anti-inflammatory response; a reaction to the presence of periodontal pathogens in the periodontium. The antiinflammatory response of periodontal tissues can have an impact on other tissues and organs due to penetration of the microorganisms from the periodontium into the bloodstream; an inflammatory reaction in individuals with weakened immunity is stimulated. Temporary bacteraemia and penetration of various germs into the bloodstream can occur e.g. during medical examination with a periodontal probe, or during chewing, or simple dental hygiene procedures, such as tooth brushing, flossing, etc. [1-2]. Periodontitis is a serious inflammatory disease connected with osteolysis, destruction of periodontal ligaments and formation of periodontal pockets filled with anaerobic bacteria. For advanced stages and forms, penetration of the most virulent strains and bacteria into the periodontal structures is typical. Prolongation of the chronic process increases the total pro-inflammatory status of the organism and enables dissemination of bacteria, virulent components and other inflammatory mediators by blood. The surrounding tissues are often invaded with periodontal pathogens and bacteraemia is caused with hematogenous spreading of these pathogens into distal tissues and organisms [3]. Nowadays periodontitis is seen as a serious systemic disease. It afflicts pregnant women when the periodontal pathogens with their virulent toxins overcome fetoplacental barriers, attack the fetal membranes and cause a preterm labor [4,5].
 
Definition and Epidemiology
 
Preterm low birth weight (PLBW) children, preterm ruptures of membranes (PROM) and Intrauterine Growth Retardation Syndrome (IUGRS) are serious prenatal and perinatal complications that are sometimes hard to distinguish. According to a WHO report the incidence of preterm low birth weight infants varies from 8% in Europe up to 26.2 % in South-Eastern Asia [6]. PLBW children are designated as infants born before the 37th week of gestation with body weight less than 2500 g. Total morbidity in further development of these children is considerably higher and presents serious medical, social, and economic problems. A chronic oral infection is just one of the possible contributors to preterm low birth weight. Other risk factors can be infections of the urogenital tract, mainly bacterial vaginosis, chorioamniotitis, mother’s age, race, diabetes, high blood pressure, alcohol abuse, tobacco smoking, low socio-economic status, as well as previous deliveries of PLBW infants [4,5,7,8].
 
Besides increased mortality in neonatal and perinatal periods, total morbidity in further development of these children is a serious medical and social problem. Preservation of etiological factors, prevention, and introduction of new preventive and therapeutic programs can save society considerable financial resources [8]. It is necessary to mention that PLBW infants can suffer various psychomotor neurological disorders, damage of cognitive functions, congenital anomalies, respiratory diseases and overall retardation of the individual [6,9].
 
Ethiopathogenesis of PLBW Children
 
Nowadays etiopathogenic problems of PLBW and PROM are mostly considered to be a matter of infection and immunity, with destructive periodontitis during pregnancy seen as one of the possible ethiopathogenetic factors of its development. Increased numbers of preterm low birth weight children are connected in some epidemiological studies with the severity of destructive changes in the periodontium [10]. In other studies, periodontitis in future mothers is not considered to be a possible risk factor in development of preterm low birth weight infants [11]. During the last trimester of fetal development, the whole fetoplacental unit gets prepared for the coming labor. In fetal membranes, myometrium and amniotic space, competent immune cells and substances of catabolic character start to accumulate to induce uterine contractions and the right timing of rupture of chorioplacental membranes followed by definite expulsion of the fetus from the mother’s body. These mechanisms seem to be centrally controlled and timed by hormones and immunity. They are needed because the fetus disposes of half of the father’s proteins, which behave as antibodies with regard to developing HLA of the fetus. Delivery is the only effective mechanism able to solve this situation [3,7,12]. Immunologically and hormonally controlled proteolysis of the fetal membranes is caused by progressive accumulation of monocytes, fibroblasts and other pro-inflammatory altered imunocytes which increase production of pro-inflammatory mediators in the fetoplacental unit. These destructive and proteolytic substances mainly include the pro-inflammatory lipid mediators PGE2, TNF-alpha, IL- 1,-2 -6,-8 and others. Increased concentration of pro-inflammatory cells and substances stimulate formation of metalloproteinases, which catabolize extracellular matrix, collagen, elastin and other protein components of fetal membranes. The physiological proteolysis of fetal membranes, induced by destructive and altered remodeling, pushes these membranes to self-destruction leading to their rupture and subsequent delivery [12,13].
 
Periodontitis and its Effect on the Organism
 
Chronic periodontitis has a huge virulent and infectious potential due to periodontal pockets filled with anaerobic bacteria and their toxins. The walls of periodontal pockets are covered with a layer of subgingival biofilms formed by specially organized antibacterial substances. To destroy bacteria in subgingival biofilm, thousand times higher concentrations are needed. Due to these facts application of antibacterial medication requires subgingival mechanical depuration by means of professional dental hygiene [14,15]. It was detected that even during common mastication and oral hygiene, bacteria and their toxins and various pro-inflammatory substances and mediators penetrate into the bloodstream. In advanced and serious periodontitis, release of LPS endotoxins and prostaglandins is a serious and healththreatening issue [1-3,16-18].
 
The whole timing and destructive activity of several components leading to rupture of placental membranes is determined by the described mechanism. It is obvious that proteolysis of these membranes is strongly influenced by the pro-inflammatory activity of various cells, immunologically active substances arising mainly in the progressively changing fetoplacental unit. This mechanism can be stimulated and accelerated by existing infection [19-21].
 
Today there is enough evidence that historically understood dental (oral) focal infection presented in a form of transient bacteria has to be supplemented by new scientific knowledge which will confirm penetration of various bacterial products, pro-inflammatory mediators and substances into the bloodstream with their subsequent possible impact on other body structures and organs as well as their stimulation of a pro-inflammatory status of several tissues or even the whole organism. However it is obvious even today that these mechanisms cannot be unified and generalized because they undergo very complicated and individually modulated immunological processes with complicated genetic, epigenetic and environmental interactions. This complicated system is probably a reason why not all studies from this field bring equal results and confirm associations of these diseases in a positive way [22-25].
 
Periodontitis and its Possible Etiopathogenic Consequences on Preterm Deliveries
 
On the basis of given facts, the following etiopathogenic mechanisms (caused by oral infection and inducing increased prevalence of preterm born infants with low birth weight) are suggested:
 
Bacteria and their toxins (LPS-toxins) can penetrate into the fetoplacental unit
 
Where they form colonies, infect the fetoplacental structures, and induce inflammatory processes followed by a preterm delivery. As for periodontal bacterial pathogens participating in preterm deliveries, the Porphyromonas gingivalis are mostly associated. The immune homeostasis of the fetus, its environment and membranes can be altered through different mechanisms. The mentioned microbes were found in amniotic water of mothers in danger of preterm deliveries. The trophoblast infection /HTR-8/ was reported to be able to modulate production of cytokines via P. gingivalis and influence on the course of pregnancy [26]. Increased production of pro-inflammatory cytokines and restriction of fetal growth after infection was detected even in animal experiments [27]. Possible associations between preterm deliveries and periodontal pathogens, periodontal status and PGE2 concentration in crevicular fluid have long been reported [12].
 
The possible decreased expression of growth and development of determining genes and factors caused by Campylobacter rectus infection is reported in another study [28]. Other review studies see the results of associations between periodontal infection and preterm deliveries of low birth weight infants to be rather controversial and require further research [29].
 
Cytokines and other pro-inflammatory mediators
 
Increased serum concentrations of pro-inflammatory cytokines / IL-1-beta, PGE2/ in future mothers afflicted with periodontitis have been confirmed in several studies [13,14,27,30,31].
 
In some studies an increased concentration of cytokines in gingival crevicular fluid over a certain level is considered to be a limiting factor of association with these diseases [12]. However no significantly important associations in production of pro-inflammatory mediators and markers have been detected by some other authors [32].
 
Genetic polymorphisms of immunologically active substances
 
Some genetic polymorphisms of pro-inflammatory mediators can be associated with preterm low birth weight deliveries. It is supposed that identical or similar polymorphisms can induce periodontitis. These associations can be mainly in polymorph forms of interleukins-1 and their antagonists [33]. In similar correlations other immunological substances and their receptors are also tested. Research in this field is expected to make progress in the near future [34].
 
Increased oxidation and decreased concentrations of antioxidants in the last trimester
 
In women in the last trimester of pregnancy, a decreased concentration of antioxidants and higher systemic and crevicular levels of oxidative substances have been detected [35]. Destructive periodontitis is a rich source of strong oxidative substances, as their production is the basic antibacterial mechanism of destruction and elimination of periodontal bacteria. However, if this process is prolonged and is not stopped early by immune mechanisms, oxidants can destroy periodontal tissues and penetrate into the bloodstream and afflict distal organs and tissues [36].
 
Hormonal influences
 
An increased formation of progesterone and estrogens stimulates formation of prostaglandins, mainly PGE2, which have significant pro-inflammatory effects on periodontal tissues. The permeability and dilatation of vessels and their subsequent exudation is increased by these hormones. One result of hormonal changes is pregnancy gingivitis with prevalence from 37 to 100 per cent [37,38]. If the mentioned changes stimulated by hormones occur in pregnant women with incipient or already developed periodontitis, further deterioration of the disease is highly probable. No changes of bacterial profiles of periodontal bacterial pathogens in the last trimester of pregnancy have been confirmed [38,39].
 
Intracellular granulocyte infection
 
Interesting facts about intracellular granulatocyte infection induced by M-cells in Payer’s patches have been presented by Nishihara. According to him intracellular granulocytes can be contaminated with an intestinal non-pathogenic infection leading to functional damage of mitochondria and other specialized compartments. These immunological diseases can be diagnosed and listed under diseases of the autoimmune system. According to Nishihra, infection is spread to other tissues and organs with contaminated leukocytes. Production of CRP, anti-nuclear antigen and IgE is stimulated. An intracellular infection can be caused by eating food cooler than 37 degrees Celsius, or by mouth breathing. Such studies have to be further examined and verified [40,41].
 
Results and Comparisons of Epidemiologic Studies
 
At the beginning it should be noted that results of epidemiological studies dealing with associations between periodontitis in pregnant women and preterm low birth weight deliveries are not unanimous and neither positive nor negative associations have definitely been confirmed, although the number of positive studies is much higher. Positive studies state that future mothers suffering periodontitis run a statistically significantly higher risk of preterm low birth delivery. In some studies these states are divided into preterm deliveries, low birth weight deliveries and deliveries of infants with retarded growth [4,14,42].
 
However association between periodontitis in pregnant women and an increased prevalence of preterm deliveries is not unanimously confirmed in all studies. Some studies deny etiopathogenetic associations and require further long-term and sophisticated research [43-45].
 
Impact of Periodontal Therapy on Development of Preterm Deliveries of Infants
 
At present periodontal anaerobic infection during pregnancy is considered a possible risk factor in preterm deliveries of low birth weight infants. Chronic and destructive periodontitis is associated with increased levels of serum and local pro-inflammatory mediators as well as transient bacteraemias. Anaerobic infection and its toxins in periodontal pockets or already invaded bacteria and increased amounts of pro-inflammatory cytokines can penetrate into the bloodstream through damaged endothelium, ulcerated mucosa or during mastication and invade distal tissues of the organism [13,23,46].
 
In spite of dozens of various studies, it is still an open question to what extent periodontological therapy can influence the development and course of preterm deliveries with low birth weight infants. The protective effects of periodontal scaling on the prevalence of preterm deliveries are referred to in some studies [47-49]. A 3.8-fold reduction of preterm deliveries, a decreased amount of periodontal bacteria and a local decrease of IL-1-beta as well as decreased serum IL-6 concentrations are reported in another study [50]. Conventional periodontal scaling reduced preterm deliveries before the 37th week of gestation in 5 %; in a group of women treated with metronidazole, the reduction was only 3.3 % [47].
 
However not all studies have confirmed a beneficial effect of periodontal therapy on the development and course of preterm deliveries of low birth weight infants and values connected with them. There is high variability among the results. These associations are denied by other authors [51-53]. Similarly, from a statistical viewpoint some studies have not confirmed periodontitis as an important risk factor in the development of preterm low birth weight infants in pregnant women [54]. Nor has research of periodontitis progress unanimously confirmed an association between progress of periodontitis and an increased risk of preterm delivery of low birth weight, although other authors refer to this association as a positive one [21].
 
Heterogeneous results of studies can also be conditioned by the existence of several risk factors which have to be taken into consideration in their evaluation and which cannot always be eliminated. Among the most serious risk factors is infection of the lower part of the urogenital tract, mainly bacterial vaginosis, which can cause chorioamniotitis and subsequent rupture of amniotic membranes. Other possible factors contributing to increased prevalence of preterm low birth weight infants which have to be mentioned and in future studies taken into consideration is the age of mothers, previous preterm deliveries, as well as education.
 
Conclusion
 
In this review study possible etiopathogenetic associations between chronic periodontitis in pregnant women and preterm deliveries of low birth weight infants were outlined. It is obvious that destructive periodontitis is a serious inflammatory disease with impact on the whole organism. In spite of the fact that several etiopathogenetic associations between both examined diseases were confirmed, the exact cause has not definitely been proven. For evaluation of results stated in the studies it is necessary to establish unified diagnostic criteria of periodontitis as well as the grades and severity of periodontal diseases. These factors as well as adequate periodontological therapy have to be taken into consideration in the evaluation of individual studies and their results. The importance of appropriate research into this field with the application of multivariable statistic methods cannot be overlooked.
 
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