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Objectives. The purpose of this study was to investigate respectively the effect of microwave irradiation post polymerization treatment, filling the repair resin with 2%wt. pretreated silica nanoparticles and the combined effect of nano-silica addition and microwave irradiation on the flexural strength and the linear dimensional stability of repaired Polymethyl Methcrylate denture base resin after accelerated aging. Methods. Sixty specimens, fabricated with heat-polymerized resin, were cut in the middle with a 3 mm gap between the cut-shorts. The cut-edges were prepared with one of the following designs: Round, Ogee or Lap. For repair, an autopolymerizing resin was used. In the first group, the repair-resin was used alone. In the second, the repaired specimens were additionally subjected to microwave irradiation after polymerization. In the third group, the repair-resin was filled with 2%wt. pretreated nano-silica. In the fourth group the repair-method combined the use of silica nanoparticles and microwave irradiation post treatment. After aging in artificial saliva, dimensional variation rates were calculated and a three point bending test was performed to investigate the flexural strength. Then, Specimens were observed in a stereooptical microscope to determine the fracture mode. Data were analyzed by one-way-ANOVA followed by Tukey’s tests (α=0.05). Results. Statistically Significant differences were noted in the flexural strength mean-values between the four repair-methods. The dimensional variation rates were under 0.03% for all the groups. A dominant cohesive fracture mode was noted when silica nanoparticles were used. Significance. The combination of autopolymerizing resin filled with 2%wt silica nanoparticles and post polymerization treatment with microwave irradiation showed the highest flexural strength mean-values without affecting the dimensional stability of the repaired specimens. Since the repair executed with silica nanoparticles’ filled resin proved to offer a sufficient bonding to the old resin, focus should be on the amelioration of the strength of the nano-filled repair-resin itself in order to further improve the mechanical properties of the repair. Correspondence to: Kharbech Nour el houda, Department of dental Biomaterials, Faculty of dental medicine, University of Monastir; Tunisia. Address: Avicenne Avenue, 5019 Monastir, Tunisia, Tel: 00 216 50 96 82 44; E-mail: nour19@live.fr

oral health and care

The use of Silica nanoparticles and microwave irradiation with Polymethyl Methcrylate denture base resin: Experimental investigation into the flexural strength and linear dimensional stability after repair and accelerated aging