Abstract
To evaluate the potential effects of endodontic procedures (instrumentation and filling) on crack initiation and propagation in apical dentine. Forty extracted single-rooted premolars with two canals were selected, 1.5mm of the apex was ground perpendicular to the long axis of the tooth and the surface polished. The specimens were divided into 4 groups. The buccal canals of groups A, B and C were enlarged to size 40 with manual K-files. Group A was filled with gutta-percha using lateral condensation and vertical compaction without sealer. Group B was filled with the same method as group A except only lateral condensation was used. Group C was left unfilled, while group D was left unprepared and unfilled. Images of the resected surface were taken after resection (baseline), after canal preparation, after filling and after 4-week storage. The images were then inspected for cracks originating from the canal. A significant effect of preparation on crack initiation (P<0.05) and no significant effect of filling (P>0.05) or 4-week storage on crack initiation (P>0.05) was found (logistic regression). Fisher's exact test revealed a significant effect of filling on crack propagation (P<0.05) and no effect of 4-week storage on crack propagation (P>0.05). Root canal procedures can potentially initiate and propagate cracks from within the root canal in the apical region.
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