Fracture resistance of weakened premolars restored with different preheated bulk fill composites (A comparative in vitro study)
Paper Details
Fracture resistance of weakened premolars restored with different preheated bulk fill composites (A comparative in vitro study)
Abstract
Objective: This was performed to evaluate the preheating effect of different bulk fill composite materials on the fracture resistance of the maxillary premolars. A 64 caries & crack-free maxillary premolar teeth were divided into groups and subgroups with eight teeth each: group 1, sound unprepared teeth; group 2, teeth received (MOD) cavity and left unrestored; group 3-A, restored with Filtek TM bulk fill posterior restoration; group 3-B, restored with preheated Filtek TM bulk fill posterior restoration; group 4-A, restored with Beautifil –Bulk ™ composite; group 4-B, restored with preheated Beautifil –Bulk ™ composite; group 5-A, restored with Tertic Evo Ceram® Bulk Fill composite; and group 5-B, restored with preheated Tertic Evo Ceram® Bulk Fill composite. The teeth subjected to compression load with the long axis of the teeth until fractured using a universal testing machine. The data were statistically analyzed using one-way ANOVA, LSD test and t-test. The specimens in groups 3–5 were examined to evaluate the mode of failure. Group 1 showed the highest fracture resistance compared with other groups at room temperature and preheated composite materials. The differences among groups were statistically highly significant (P<0.01).Group 2 showed the lowest fracture resistance. Among the restored groups, group 4 recorded the highest fracture resistance than others, and statistically significant difference was found (P<0.05).No statistically significant differences were found (P<0.05) among the restored groups when preheated composite materials were used. No statistically differences were found (P<0.05) among the subgroups except group 5-A at room temperature and group 5-B at 54±1 °C.
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Othman H. Abdulhameed, Zainab M. Abdul-Ameer (2018), Fracture resistance of weakened premolars restored with different preheated bulk fill composites (A comparative in vitro study); IJB, V13, N4, October, P237-247
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