Aslam Ayesha, Khan Danish Azeem, Hassan Syed Hammad, Ahmed Bilal
Dent Update. 2017 May;44(5):448-50, 453-4, 456. doi: 10.12968/denu.2017.44.5.448.
All dental restorations are liable to failure during function. Failure could be biologic, aesthetic, mechanical or a combination. Ceramic restorations in particular, including metal-ceramics, are prone to mechanical fracture, especially the fracture of veneering porcelain. Fracture of a metal-ceramic restoration jeopardizes function as well as aesthetics. It is equally onerous to manage for both patient and dentist. Optimal management of such cases requires a detailed knowledge of the aetiology behind this phenomenon. The current paper aims to highlight possible causative factors involved in the mechanical failures of metal-ceramic restorations. Clinical relevance: Ceramic fracture in metal-ceramic crowns and fixed partial dentures is routinely encountered in dental clinics. Knowledge of the aetiology is required to diagnose and manage such cases accurately as well as to avoid these errors in future.
所有牙科修复体在功能使用过程中都有失败的可能。失败可能是生物学、美学、机械方面的，或者是多种因素的综合。特别是陶瓷修复体，包括金属烤瓷修复体，容易发生机械性断裂，尤其是饰面瓷的断裂。金属烤瓷修复体的断裂会危及功能和美观。这对患者和牙医来说处理起来都同样棘手。对此类病例的最佳处理需要详细了解这一现象背后的病因。本文旨在强调金属烤瓷修复体机械性失败可能涉及的致病因素。临床相关性：在牙科诊所中，金属烤瓷冠和固定局部义齿的陶瓷断裂是常有的情况。需要了解病因才能准确诊断和处理此类病例，并在未来避免这些失误。
