Comparison of the Frequency of Dentinal Microcracks after Apical Resection in the Roots with Cast and Fiber Posts

Endodontically treated teeth are prone to fracture and cracks. Accordingly, different types of posts are used to increase the fracture resistance of teeth. This study was performed to compare the dentinal microcracks in resected roots with cast and fiber posts.
This experimental study was conducted on 40 single-canal premolars extracted for orthodontic or periodontal reasons. Initially, the teeth were examined under an endodontic microscope for microcracks and mounted using acrylic and randomly assigned into two groups: cast post and fiber post (n=20 teeth per group), 24 h after endodontic treatment. A metal crown was made for the teeth after post cementation in each group. Finally, teeth were cut (3 mm apical) using a diamond fissure bur perpendicular to the longitudinal axis of the root. The samples were examined for the presence or absence of microcracks using an endodontic microscope. The Chi-square test and Fisher’s exact test were used to analyze the data.
Based on the obtained results, the frequencies of dentinal microcracks were 30% and 40% in the apically resected roots with cast and fiber posts, respectively.
The frequencies of dentinal microcracks were similar in cast post and fiber post groups.