Fracture resistance of root-filled teeth after cavity preparation with conventional burs

Year 2018, Volume: 52 Issue: 2, 59 - 63, 01.05.2018

Uğur Aydın Fatih Aksoy Samet Tosun

Abstract

Purpose
The aim of the present study is to compare the fracture resistance of teeth after
access cavity preparation with conventional rotary burs, Erbium-doped yttrium
aluminum garnet laser (Er:YAG) and Erbium, cromium: yttrium scandium gallium
garnet laser (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 those of 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 bur has no effect on the fracture
resistance of teeth with root canal treatment.

Keywords

Bur, cavity preparation, Er, Cr:YSGG, Er:YAG, fracture resistance

References

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