Malament K A, Socransky S S
Tufts University School of Dental Medicine; and Forsyth Dental Center, Boston, Mass., USA.
J Prosthet Dent. 1999 Jun;81(6):662-7. doi: 10.1016/s0022-3913(99)70104-6.
The influence of different restorative design features on the long-term survival of Dicor glass-ceramic restorations is not well understood.
This study examined the relationship of different types of restorations and methods of preparation with the survival of Dicor glass-ceramic restorations functioning in vivo.
A total of 1444 Dicor glass-ceramic restorations were placed on the teeth of 417 adults. Failure was defined as a restoration that required remake because of material fracture. Survival of restorations of different types and with different methods of preparation was described by using Kaplan Meier survivor functions. Statistical significance between restoration type and preparation method was determined with the log rank test.
Probability of survival of a typical partial coverage restoration was 92% at 11.3 years. There was no statistically significant difference between the survival of inlay or onlay restorations. For the 91 cores used for pulpless teeth, none failed over a total cumulative monitoring period of 419 years. There was no significant difference in survival of acid-etched Dicor restorations that were placed on shoulder or chamfer preparations. Thickness measured at the midpoint of the labial, lingual, mesial, distal, and midocclusal surfaces did not relate to risk of failure.
The majority of Dicor glass-ceramic partial coverage inlay and onlay restorations and cores survived over time. Survival of restorations with either chamfer or shoulder preparations did not differ whether the restoration was acid-etched. Thickness of the restoration measured at the midaxial point of each surface did not relate to survival.
不同修复设计特征对Dicor玻璃陶瓷修复体长期存留率的影响尚未完全明确。
本研究探讨了不同类型修复体及预备方法与体内行使功能的Dicor玻璃陶瓷修复体存留率之间的关系。
共对417名成年人的牙齿进行了1444颗Dicor玻璃陶瓷修复体修复。失败定义为因材料断裂而需要重新制作的修复体。采用Kaplan-Meier生存函数描述不同类型及不同预备方法的修复体的存留情况。使用对数秩检验确定修复体类型和预备方法之间的统计学显著性差异。
典型部分覆盖修复体在11.3年时的存留概率为92%。嵌体或高嵌体修复体的存留率之间无统计学显著性差异。对于用于无髓牙的91个桩核，在总计419年的累积监测期内均未失败。置于肩台或斜面预备上的酸蚀Dicor修复体的存留率无显著差异。在唇面、舌面、近中面、远中面及牙合面中点测量的厚度与失败风险无关。
大多数Dicor玻璃陶瓷部分覆盖嵌体、高嵌体修复体及桩核随时间推移得以存留。无论修复体是否酸蚀，斜面或肩台预备的修复体的存留率无差异。在每个表面中轴线点测量的修复体厚度与存留率无关。
