Citation Information :
Kamath AK, Kudva AR, Eram A, Sreekantan PM, Kini S. Comparative Evaluation of Fracture Resistance of Posterior Teeth Restored Using Three New Composite Materials: An In Vitro Study. World J Dent 2023; 14 (7):608-612.
Aim: The Aim of this study was to evaluate the fracture resistance of premolar teeth restored using three new composite materials.
Materials and methods: A total of 75 noncarious maxillary premolars, divided into five groups of 15 in each group were subjected to mechanical tests to evaluate their resistance to fracture. Group I consisted of Intact teeth. Group II received [mesio-occlusal distal (MOD)] cavity preparation and was left unrestored, group III received (MOD) preparation restored with evereX posterior. Teeth in group IV received (MOD) preparation and were restored with smart dentin replacement. Teeth in group V received (MOD) cavity preparation and were restored with 3M Filtek bulk-fill. The restored teeth were then subjected to compressive axial load in a mechanical testing appliance which was then subjected to thermocycling for 500 cycles at temperatures of 5 and 55° C.
Results: The fracture resistance was found to be maximum in group III samples and was least in group II. The comparative evaluation showed significant statistical differences in fracture resistance determined in various groups studied.
Conclusion: Under compression loading and within the limitations of this study, it was found that the everX posterior increased the resistance to fracture almost similar to that of sound teeth. EverX posterior showed the same fracture toughness as a healthy intact tooth. The samples containing smart dentin replacement (SDR) and 3M had fracture resistance lower than the natural unprepared tooth.
Clinical significance: The newer tooth-colored restorative materials demonstrated good fracture toughness and better biocompatibility when compared to previously used dental materials.
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