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Mechanical behavior of endodontically restored canine teeth: Effects of ferrule, post material and shape

套圈 材料科学 牙冠(牙科) 锥面 复合材料 桥台 牙本质 根管 牙冠伸长术 牙周纤维 牙科 口腔正畸科 结构工程 光学 工程类 物理 光纤 医学
作者
Pietro Ausiello,S Ciaramella,Massimo Martorelli,Antonio Lanzotti,Fernando Zarone,David C. Watts,Antonio Gloria
出处
期刊:Dental Materials [Elsevier]
卷期号:33 (12): 1466-1472 被引量:45
标识
DOI:10.1016/j.dental.2017.10.009
摘要

To assess the effect of a ferrule design with specific post material-shape combinations on the mechanical behavior of post-restored canine teeth.Micro-CT scan images of an intact canine were used to create a 3-D tessellated CAD model, from which the shapes of dentin, pulp and enamel were obtained and geometric models of post-endodontically restored teeth were created. Two types of 15mm post were evaluated: a quartz fiber post with conical-tapered shape, and a carbon (C) fiber post with conical-cylindrical shape. The abutment was created around the coronal portion of the posts and 0.1mm cement was added between prepared crown and abutment. Cement was also added between the post and root canal and a 0.25mm periodontal ligament was modeled around the root. Four models were analysed by Finite Element (FE) Analysis: with/without a ferrule for both types of post material and shape. A load of 50N was applied at 45° to the longitudinal axis of the tooth, acting on the palatal surface of the crown. The maximum normal stress criterion was adopted as a measure of potential damage.Models without a ferrule showed greater stresses (16.3MPa) than those for models with a ferrule (9.2MPa). With a ferrule, stress was uniformly distributed along the abutment and the root, with no critical stress concentration. In all models, the highest stresses were in the palatal wall of the root. Models with the C-fiber post had higher stress than models with the quartz fiber posts. The most uniform stress distribution was with the combination of ferrule and quartz fiber post.The FE analysis confirmed a beneficial ferrule effect with the combination of ferrule and quartz fiber post, with tapered shape, affording no critical stress concentrations within the restored system.
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