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Influence of post-thickness and material on the fracture strength of teeth with reduced coronal structure

2013; Medknow; Volume: 16; Issue: 2 Linguagem: Inglês

10.4103/0972-0707.108196

0974-5203

Ataís Bacchi, Mateus Bertolini Fernandes dos Santos, MarceleJardim Pimentel, ConradoReinoldes Caetano, Mário AlexandreCoelho Sinhoreti, Rafael LeonardoXediek Consani,

Dental Radiography and Imaging

Purpose: To evaluate the fracture strength of endodontically treated teeth with reduced coronal structure reinforced with glass-fiber posts and cast posts and core (nickel-chromium alloy) with different thickness. Materials and Methods: Forty maxillary central incisors were sectioned at 1 mm of the cementoenamel junction and endodontically treated. The teeth were divided into four groups ( n = 10) and restored with cast post and core and glass-fiber posts with diameters of 1.5 mm and 1.1 mm. The fracture strength was evaluated using a Universal Testing Machine (Instron 1144) at 45° of angulation. The results were submitted to analysis of variance two-way and Tukey's test ( P < 0.05). The failure mode was also evaluated. Results: Cast post and core were statistically superior to the glass-fiber posts with the self-post diameter ( P = 0.001). When the self-post material was considered, no significant difference was observed between the two post-diameters ( P = 0.749). The glass-fiber post-groups presented more fractures in the cervical third than the cast post and core groups. Conclusion: Teeth restored with cast post and cores present higher fracture strength than those reinforced with glass-fiber posts. An increased post-thickness does not increase the fracture strength. Glass-fiber posts lead to less severe fractures.