engleski

INFLUENCE OF DIFFERENT CORONAL RESTORATION TECHNIQUES ON FRACTURE RESISTANCE OF ENDODONTICALLY TREATED TOOTH

Aim: This research evaluates the fracture resistance of endodontically treated teeth with extensive MOD cavities based on different types of restorative material. The purpose of this study is to determine whether short fiber reinforced composite resign (SFRC) can compensate the loss of dental tissue in extensive MOD cavities or if crown placement is fully necessary. Materials and methods: In the study, 40 extracted molars were divided into four groups (n = 10). One group (CG) was left intact to serve as a control. Teeth inside the three experimental groups received extensive MOD cavity preparation and root canal treatment. The approximal tooth surfaces were restored with hybrid composite by using the incremental technique. The specimens were prepared and restored with their respective core materials as follows: (i) EX - EverX Posterior (GC Japan) + high-level microhybrid com- posite ; (ii) BF - Filtek One Bulk Fill (3M, USA) + high-rise microhybrid composite ; (iii) GIC - Fuji II LC (GC Japan) + high-level microhybrid composite. Restored teeth were embedded into resin molds and subjected to thermocycling. The specimens were scanned with an extraoral scanner to evaluate the tooth surface for the stress calculation. Fracture resistance was tested using the universal testing machine. The results were statistically analysed using ANOVA and Tukey’s HDS post hoc tests. Results: The control group (CG) showed a significant difference from experimental groups within maximum and break force (p < 0.01). The only difference between the experimental groups was made between the EX group and the GIC group where the maximum force values were statistically significantly lower in the SIC group compared to the EX (p < 0.05). Conclusion: The greatest fracture resistance was demonstrated by the control group (CG), while the SFRC restoration did not show a significant difference in resistance compared to other groups. The most probable cause may be MOD preparation with an isthmus greater than 2/3 of the vestibulooral width.

short fiber-reinforced composite ; fracture resistance ; maximum force ; breakIng force ; pressure strength ; breaking strength ; post endodontic restoration

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