School of Dentistry, Universidad del Valle, Cali, Colombia.
J Prosthodont. 2012 Jul;21(5):340-5. doi: 10.1111/j.1532-849X.2011.00837.x. Epub 2012 Feb 28.
The aim of this study was to analyze the survival rate and failure mode of IPS leucite-reinforced ceramic onlays and partial veneer crowns regarding thickness under the following clinical conditions: vital versus nonvital teeth, tooth location, and type of opposing dentition.
Teeth were prepared according to established guidelines for ceramic onlays and partial veneer crowns. Before cementation, the restorations were measured for occlusal thickness at the central fossa, mesial, and distal marginal ridges, and functional and nonfunctional cusps. A total of 210 ceramic restorations were cemented in 99 patients within a mean observation period of 2.9 ± 1.89 years. The mode of failure was classified and evaluated as (1) adhesive, (2) cohesive, (3) combined failure, (4) decementation, (5) tooth sensitivity, and (6) pulpal necrosis. Kaplan, log-rank, and Cox regression tests were used for statistical analysis.
The failure rate was 3.33% (7/210). Increased material thickness produced less probability of failures. Vital teeth were less likely to fail than nonvital teeth. Second molars were five times more susceptible to failure than first molars. Tooth sensitivity postcementation and the type of opposing dentition were not statistically significant in this study.
In this study, thickness of the restorations, tooth vitality, and location of teeth in the dental arch influenced restoration failures.
本研究旨在分析在以下临床情况下，IPS 锂基陶瓷嵌体和部分贴面冠的存活率和失败模式：活髓牙与死髓牙、牙位和对颌牙类型。
根据陶瓷嵌体和部分贴面冠的既定指南制备牙齿。在粘固之前，在中央窝、近中和远中边缘嵴以及功能和非功能尖顶处测量修复体的咬合厚度。在平均 2.9±1.89 年的观察期内，将 210 个陶瓷修复体粘固在 99 名患者的牙齿中。将失败模式分类并评估为：（1）黏附性，（2）内聚性，（3）联合性，（4）脱粘，（5）牙敏感，和（6）牙髓坏死。采用 Kaplan、log-rank 和 Cox 回归检验进行统计分析。
失败率为 3.33%（7/210）。增加材料厚度可降低失败的可能性。活髓牙比死髓牙更不容易失败。第二磨牙比第一磨牙更容易发生失败，其失败风险是第一磨牙的五倍。本研究中，粘固后牙敏感和对颌牙类型与失败无关。
在这项研究中，修复体的厚度、牙齿活力和牙弓中的位置影响了修复体的失败。
