An in vitro Study of Fracture Resistance of Composite Overlay in Endodontically-Treated Maxillary Permolars with Mesio-Occluso-Distal (MOD) Cavity Restored with Fibr Reinforced Composite (Nulite F) and Posterior Packable Composite (3M- P60)
Abstract:
There are many restorative designs for root canal treated maxillary premolars. One of these treatments is overlay composite with fiber-reinforced composite. The aim of the present study was to compare the fracture resistance of endodontically-treated maxillary permolars with MOD cavities restored using fiber-reinforced composite and posterior packable composite (3M-P60). Seventy-two sound maxillary permolars with the same size were chosen and randomly divided into six groups of 12. Group 1: intact teeth; Group2: Root canal treated teeth with MOD cavity; Groups 3 and group 4: Root canal treated teeth with MOD cavity preparation for direct fiber-reinforced (Nulite F) composite Onlay using Nulite F2 linear (group 3: at 90° degree of force, group 4: at 45° degree of force) Groups 5 and 6: these groups were prepared in the same way as groups 3 and 4, differing in that these specimens were restored by 3M-P60 composite instead of Nulite F. (group 5: at 90° degree of force, group 6: at 45° degree of force). ANOVA and Comparison multiple tests were used for statistical analysis.The mean fracture resistance obtained was: Group 1:2.092 KN; Group 2:0.862 KN Group3: 1.639KN; Group 4:0.806 KN; Group 5: 1.314KN; Group 6: 0.615 KN. Except for groups 4 and 6, the p-value showed significant difference among the others. The destructive effects of oblique (shear) forces are more than vertical forces. Cavity form and existence of marginal ridge are other factors that are effective on fracture resistance. Endodontically-treated maxillary premolars with MOD cavities could be successfully restored by fiber-reinforced composite, but this is not recommended for persons with para-functional inhibitions.
Language:
Persian
Published:
Jundishapur Scientific Medical Journal, Volume:6 Issue: 3, 2008
Page:
356
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