The aim of this study is to determine the effect of different lengths of post space preparation on the incidence of root crack formation using micro-computed tomography (micro-CT).
Forty-two single and straight-rooted human lower premolar teeth were used. Teeth were randomly divided into 2 groups (n = 21). All teeth were scanned using micro-CT before and after the canal shaping, followed by filling with gutta-percha and a resin-based root canal sealer. Different lengths of post space [1/2 (Group 1) and 2/3 (Group 2)] of the canal length] were prepared for the teeth in Group 1 and Group 2. Teeth were again scanned with micro-CT.
After the post space preparation, no new microcrack formation was observed. As a result of the propagation of microcracks detected in the first scan, completed fractures were detected in 3 teeth in Group 1 and in 2 teeth in Group 2.
It can be concluded that the different lengths of post space preparation did not affect the incidence of microcrack formation in root dentin.