Jankar Ajit S, Kale Yogesh, Kangane Suresh, Ambekar Anand, Sinha Manish, Chaware Sachin
Department of Prosthodontics, MIDSR, Dental College, Latur, Maharashtra, India.
Department of Pedodontics & Preventive Dentistry, MIDSR, Dental College, Latur, Maharashtra, India.
J Int Oral Health. 2014 Feb;6(1):48-54. Epub 2014 Feb 26.
Ceramic veneer fracture has occurred mainly at the incisal edge of the veneer because of greater stress. This study compares and evaluates the fracture resistance ceramic veneers with three different incisal preparations.
MATERIALS & METHODS: 15 human permanent maxillary central incisor extracted were selected which were divided into three groups of 5 each having a different Incial design Preparation. Group 1: No Incisal reduction with facio- incisal bevel, Group 2 : 1 mm incisal reduction with butt joint, Group 3 : 1 mm incisal reduction with 1 mm height of Palatal chamfer. It was found that Group III had greater fracture resistance as compared to Group I and Group II. Group I had least fracture resistance as compared to Group II and III. Group II had greater fracture resistance as compared to Group I but less than Group III.
Ceramic veneer with 1mm incisal reduction with 1mm height of palatal chamfer showed highest fracture resistance as compared to 1mm incisal reduction with butt joint and no incisal reduction with facial-incisal bevel, in order to achieve better esthetic and functional results.
The palatal chamfer margin results in preservation of some peripheral enamel layer, which eliminates the micro leakage at the palatal margin-restoration interface and also effectively counteracting shear stress. This design provides a definite seat for cementation. How to cite the article: Jankar AS, Kale Y, Kangane S, Ambekar A, Sinha M, Chaware S. Comparative evaluation of fracture resistance of Ceramic Veneer with three different incisal design preparations - An In-vitro Study. J Int Oral Health 2014;6(1):48-54.
由于应力较大，陶瓷贴面骨折主要发生在贴面的切缘处。本研究比较并评估了三种不同切端预备方式的陶瓷贴面的抗折性。
选取15颗拔除的人类上颌恒中切牙，分为三组，每组5颗，每组有不同的切端设计预备方式。第1组：无切端磨除，有唇面-切端斜面；第2组：切端磨除1mm，对接；第3组：切端磨除1mm，腭侧有1mm高的切角。结果发现，与第1组和第2组相比，第3组具有更大的抗折性。与第2组和第3组相比，第1组的抗折性最低。与第1组相比，第2组具有更大的抗折性，但低于第3组。
与切端磨除1mm对接和无切端磨除唇面-切端斜面相比，切端磨除1mm且腭侧有1mm高切角的陶瓷贴面显示出最高的抗折性，以便获得更好的美学和功能效果。
腭侧切角边缘可保留一些周边釉质层，消除腭侧边缘-修复体界面处的微渗漏，并有效抵消剪切应力。这种设计为粘接提供了一个确定的位置。如何引用本文：Jankar AS, Kale Y, Kangane S, Ambekar A, Sinha M, Chaware S. 三种不同切端设计预备方式的陶瓷贴面抗折性的比较评价——一项体外研究。《国际口腔健康杂志》2014；6(1):48 - 54。
