Effect of cavity preparation on the flexural strengths of acrylic resin repairs
AUTOR(ES)
Elhadiry, Safa Salim, Yunus, Norsiah, Ariffin, Yusnidar Tajul
FONTE
Journal of Applied Oral Science
DATA DE PUBLICAÇÃO
2010-12
RESUMO
OBJECTIVE: To investigate the effect of cavity preparation on the flexural strength of heat-curing denture resin when repaired with an auto-curing resin. MATERIAL AND METHODS: Ninety-six rectangular specimens (64x10x2.5 mm) prepared from heat-curing denture base resin (Meliodent) were randomly divided into four groups before repair. One group was left intact as control. Each repair specimen was sectioned into two; one group was repaired using the conventional repair method (Group 1). Two groups had an additional transverse cavity (2x3.5x21.5 mm) prepared prior to the repair; one repaired with (Group 2) and one without glass-fiber reinforcement (Group 3). A three-point flexural bending test according to the ISO 1567:1999 specification8 for denture base polymers was carried out on all groups after 1, 7 and 30 days of water immersion. Statistical analysis was carried out using two-way ANOVA, Kruskal Wallis and post-hoc Mann Whitney tests. RESULTS: The highest flexural strength was observed in the control group. Control and conventional repairs group (Group 1) showed reduction in the flexural strength 30 days after water immersion. No significant change in the strength was observed for Groups 2 and 3 where the repair joints were similarly prepared with additional transverse cavity. CONCLUSION: Repaired specimens showed lower flexural strength values than intact heat-curing resin. Cavity preparation had no significant effect on the flexural strength of repair with water immersion.
Documentos Relacionados
- Flexural strength of acrylic resin repairs processed by different methods: water bath, microwave energy and chemical polymerization
- Effect of incorporation of 2-tert-butylaminoethyl methacrylate on flexural strength of a denture base acrylic resin
- Influence of incorporation of fluoroalkyl methacrylates on roughness and flexural strength of a denture base acrylic resin
- The Effect of Experimental Denture Cleanser Solution Ricinus communis on Acrylic Resin Properties
- Effect of different solutions on color stability of acrylic resin-based dentures