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

PurposeThe aim of the present study is to compare the fracture resistance of teeth afteraccess cavity preparation with conventional rotary burs, Erbium-doped yttriumaluminum garnet laser (Er:YAG) and Erbium, cromium: yttrium scandium galliumgarnet laser (Er,Cr:YSGG) lasers.Materials and methodsFifty 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 controlgroup (intact teeth; n=10). Access cavities of groups 1, 2 and 3 were prepared withconventional burs, Er:YAG laser and Er,Cr:YSGG laser respectively. After root canalobturation, 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 wererestored with composite resinafter root canal obturation. Following thermocycling,fracture strength was evaluated with a Universal Testing Machine. Mean force at whicheach sample is fractured was recorded in Newton unit and statistically analyzed.ResultsFracture resistance of group 7 (intact teeth) was significantly higher than all othergroups (p<0.001). Differences among the fracture resistance values of groups 4, 5 and 6were not significantly different but they were significantly higher than those of groups1, 2 and 3 (p<0.001). No significant difference was found between Groups 1, 2 and 3.ConclusionPreparing access cavities with either laser or bur has no effect on the fractureresistance of teeth with root canal treatment.

Keywords:

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

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ISSN: 2630-6158
Yayın Aralığı: Yılda 3 Sayı
Başlangıç: 1967
Yayıncı: İstanbul Üniversitesi

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