پزشکی بالینی ابن سینا (Dec 2013)
Comparison of the Fracture Resistance of 3 Different Posts in Restoring Extensively Damaged Primary Maxillary Incisors
Abstract
Introduction & Objective: The management of mutilated primary incisors in early childhood caries is a clinical challenge. This study's purpose was to compare the resistance strength of 3 different types of posts in restoring broken primary incisors: (1) composite posts, (2) ortho-dontic wire posts and (3) quartz fiber posts. Materials & Methods: This semi experimental in vitro study was performed on 27 extracted human primary maxillary incisors. The coronal portion of specimens was sectioned 1-mm above the cementoenamel junction. Complete pulpectomy was performed for all specimens. The post space was created using a straight fissure bur approximately 3 mm. Samples were randomly divided into 3 groups. Group 1(composite posts and composite core), group 2(quartz fiber posts and composite core) and group 3 (orthodontic γ wire posts and composite core). Mounted specimens were subjected for fracture strength on an instron testing ma-chine at 45 angles. Results: Mean fracture strength value for group 1 was 248.9±72.36 N, group 2 was 446.7±116.4 N and group 3 was 365.6±31.3. This result showed significant differences among the three groups.Conclusion: Quartz fiber posts showed greater fracture strength for extensively damaged primary incisors than composite posts and orthodontic wire posts.
