Comparison of the Fracture Resistance of 3 Different Posts in Restoring Extensively Damaged Primary Maxillary Incisors

Introduction & 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. 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? wire posts and composite core). Mounted specimens were subjected for fracture strength on an instron testing ma-chine at 45 angles. 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. Quartz fiber posts showed greater fracture strength for extensively damaged primary incisors than composite posts and orthodontic wire posts.