Fages Michel, Raynal Jacques, Tramini Paul, Cuisinier Frédéric Jg, Durand Jean-Cédric
Int J Prosthodont. 2017 November/December;30(6):556–560. doi: 10.11607/ijp.5132. Epub 2017 Oct 30.
The objective of the present study was to analyze the clinical outcomes of 447 monoblock ceramic chairside computer-aided design/computer-aided manufacture (CAD/CAM) reconstructions over a 7-year functional period. Of these reconstructions, 212 were peripheral crowns and 235 were endocrowns.
The restorations were placed between 2003 and 2008 in a total of 323 patients. They were created using a chairside CAD/CAM method and the same materials in all cases. All of the crowns were manufactured and glued during the same clinical session by the same practitioner. Data were descriptively analyzed and survival probabilities were calculated using Kaplan-Meier statistics.
Of the 447 restorations, only 6 failures occurred, resulting in a success rate of 98.66%. All of the failures were the result of a partial ceramic fracture. Of the six ceramic fractures, five appeared on peripheral crowns and one on an endocrown. All fractures appeared in the first 24 months, including two in the first month. Log-rank test comparing incidence rates between crowns and endocrowns showed no significant differences (P = .08).
This survival rate study reinforced the use of CAD/CAM full ceramic crowns and endocrowns on molars, showing a much more favorable survival rate for endocrowns.
本研究的目的是分析447个整体式陶瓷椅旁计算机辅助设计/计算机辅助制造（CAD/CAM）修复体在7年功能期内的临床结果。在这些修复体中，212个是外周冠，235个是嵌体冠。
这些修复体于2003年至2008年期间放置在总共323例患者体内。它们采用椅旁CAD/CAM方法制作，且所有病例均使用相同材料。所有牙冠均由同一名医生在同一临床诊疗过程中制作并粘结。对数据进行描述性分析，并使用Kaplan-Meier统计方法计算生存率。
在447个修复体中，仅出现6例失败，成功率为98.66%。所有失败均为陶瓷部分断裂所致。在这6例陶瓷断裂中，5例出现在外周冠，1例出现在嵌体冠。所有断裂均发生在最初24个月内，其中2例发生在第一个月。比较冠和嵌体冠发病率的对数秩检验显示无显著差异（P = 0.08）。
这项生存率研究支持在磨牙上使用CAD/CAM全瓷冠和嵌体冠，结果显示嵌体冠的生存率更有利。
