Hwang J W, Yang J H
Department of Prosthodontics, College of Dentistry and Dental Research Institute, Seoul National University, 28 Tonkon-Dong Chongro-Gu, Seoul, 110-749, Korea.
J Oral Rehabil. 2001 Jul;28(7):678-83. doi: 10.1046/j.1365-2842.2001.00731.x.
The purpose of this study was to compare the fracture resistance of copy-milled and conventional In-Ceram crowns. Four groups of 10 uniform sized all-ceramic anterior crowns were fabricated for this test: (1) In-Ceram Spinell (2) In-Ceram Alumina (3) Celay In-Ceram Spinell, and (4) Celay In-Ceram Alumina crowns. All specimens were cemented on stainless steel master die with resin cement and stored in 37 degrees C water for one day prior to loading into a universal testing machine. Using a steel ball at a crosshead speed of 0.5 mm min-1, the crowns were loaded at 30 degrees C angle until catastrophic failure occurred. Mean fracture strength was analysed and compared. Under the conditions of this study and the materials used, the following conclusions were drawn: 1. The strength of Celay In-Ceram anterior crowns had a slightly higher fracture strength than conventional In-Ceram crowns. 2. In-Ceram Alumina crowns had a significantly higher fracture strength than In-Ceram Spinell crowns in both conventional and copy milling methods.
本研究的目的是比较复制研磨型和传统In-Ceram全瓷冠的抗折性。为此试验制作了四组每组10个尺寸一致的全瓷前牙冠：（1）In-Ceram尖晶石全瓷冠（2）In-Ceram氧化铝全瓷冠（3）Celay复制研磨型In-Ceram尖晶石全瓷冠，以及（4）Celay复制研磨型In-Ceram氧化铝全瓷冠。所有试件均用树脂粘结剂粘结在不锈钢代型上，并在加载到万能试验机之前在37℃水中储存一天。使用钢球，以0.5毫米/分钟的十字头速度，在30℃角度下对全瓷冠加载直至发生灾难性破坏。分析并比较平均抗折强度。在本研究条件及所使用材料的情况下，得出以下结论：1. Celay复制研磨型In-Ceram前牙冠的强度比传统In-Ceram全瓷冠的抗折强度略高。2. 无论是传统制作方法还是复制研磨方法，In-Ceram氧化铝全瓷冠的抗折强度均显著高于In-Ceram尖晶石全瓷冠。
