Fracture resistance of weakened premolars restored with different preheated bulk fill composites (A comparative in vitro study)

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Research Paper 01/10/2018
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Fracture resistance of weakened premolars restored with different preheated bulk fill composites (A comparative in vitro study)

Othman H. Abdulhameed, Zainab M. Abdul-Ameer
Int. J. Biosci.13( 4), 237-247, October 2018.
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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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