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Volume 7, Issue 2 (Suppl) J Biotechnol Biomater
ISSN: 2155-952X JBTBM, an open access journal Biomaterials 2017
March 27-28, 2017
2nd Annual Conference and Expo on
March 27-28, 2017 Madrid, Spain
The use of silica nano-particles and microwave irradiation in dental PMMA repairs: Experimental
investigation into the mechanical properties and dimensional stability of the repaired PMMA after aging
Nour El Houda Kharbech
University of Monastir, Tunisia
Statement of the Problem: Despite ceaseless evolutions in the dental practice, PMMA resin has managed to keep a prime position in
the panoply of dental materials. Yet, this material is far from being perfect. Concerns are constantly reiterated throughout literature
about its lack of mechanical resistance which results in frequent fracture and fatigue failures of dentures. This fracture creates
inconvenience to both the patient and the dentist thus it could be considered as a failure of the executed treatment, in addition
to further frequently unnoticed consequences regarding the incurred costs to the community of the dentures’ repair. Despite the
wide range of solutions suggested to repair the damaged denture and to avoid its further fracture, a consensus seems not to be
established yet. Recently, the use of microwave irradiation and nanofillers including silica nanoparticles with PMMA denture-resin
has attracted researchers’ attention thus it showed encouraging results in different studies but their efficiency for repairs need to be
further investigated.
Methodology & Theoretical Orientation: An in vitro study was carried out to investigate the flexural strength, fracture toughness
and dimensional stability of 120 repaired PMMA samples after aging in artificial saliva. Autopolymerizing resin was used to repair
them following four methods. For the first group, autopolymerizing resin was used alone. In the second, samples were post-treated
with microwave irradiations. In the third, the autopolymerizing resin was filled with 2% nanosilica. For the fourth group, the second
and the third approaches were combined.
Findings: The investigatedmechanical properties showed higher mean-values when silica nanoparticles and/or microwave irradiation
were used compared to the repair with autopolymerizing resin alone. The dimensional variation rates were under 0.03% for all the
groups.
Conclusion & Significance: The combination of autopolymerizing resin filled with 2% silica nanoparticles and post polymerization
treatment with microwave irradiation showed the highest mechanical properties without affecting the dimensional stability of the
repaired samples.
Biography
Nour El Houda Kharbech is Young Researcher at the Faculty of Dental Medicine of Monastir in Tunisia. She is a Member of the Tunisian Association of Dental Researches
and the Tunisian Red Crescent. She received a Doctoral degree in Dental Medicine from Dental Medicine Faculty in Monastir, Tunisia, recently. Her current field placement
is with the Department of Biomaterial in Dental Medicine Faculty at the University of Monastir. She is interested in introduction of nanofillers in the dental field, behavior of
PMMA resin under oral conditions,in vitro simulation of oral conditions and removable dental restorations’ problems caused by the material of fabrication.
Nour El Houda Kharbech, J Biotechnol Biomater 2017, 7:2 (Suppl)