FRACTURE RESISTANCE OF ROOT-FILLED TEETH AFTER CAVITY PREPARATION WITH CONVENTIONAL BURS, Er:YAG AND Er,Cr:YSGG LASERS
Purpose: The aim of the present study is to compare the fracture resistance of teeth after access cavity preparation with conventional rotary burs, Er:YAG and Er,Cr:YSGG lasers.
Materials and Methods: Fifty five intact mandibular molars were divided into 3 negative groups (groups 1, 2, 3; n = 5 for each), 3 study groups (groups 4, 5, 6; n = 10 for each) and 1 positive control group (intact teeth; n = 10). Access cavities of groups 1, 2 and 3 were prepared with conventional burs, Er:YAG laser and Er,Cr:YSGG laser respectively. After root canal obturation, their coronal portions were left non-restored. Access cavities of groups 4, 5 and 6 were prepared by using the same equipment but their coronal portions were restored with composite resinafter root canal obturation. Following thermocycling, fracture strength was evaluated with a Universal Testing Machine. Mean force at which each sample is fractured was recorded in Newton unit and statistically analyzed
Results: Fracture resistance of group 7 (intact teeth) was significantly higher than all other groups (p<0.001). Differences among the fracture resistance values of groups 4, 5 and 6 were not significantly different but they were significantly higher than thoseof groups 1, 2 and 3 (p< 0.001). No significant difference was found between Groups 1, 2 and 3.
Conclusion: Preparing access cavities with either laser or burhas no effect on the fracture resistance of teeth with root canal treatment.
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