Department of Prosthodontics, School of Dentistry, University Medical Center Freiburg, Freiburg, Germany.
J Oral Rehabil. 2013 Aug;40(8):609-17. doi: 10.1111/joor.12075. Epub 2013 Jun 8.
The aim of this prospective randomised controlled clinical trial was to evaluate the clinical outcome of shrinkage-free ZrSiO4 -ceramic full-coverage crowns on premolars and molars in comparison with conventional gold crowns over a 5-year period. Two hundred and twenty-three patients were included and randomly divided into two treatment groups. One hundred and twenty-three patients were restored with 123 ZrSiO4 -ceramic crowns, and 100 patients received 100 gold crowns, which served as the control. All crowns were conventionally cemented with glass-ionomer cement. After an observation period of 6, 12, 24, 36, 48 and 60 months, the survival probability (Kaplan-Meier) for the shrinkage-free ZrSiO4 -ceramic crowns was 98·3%, 92·0%, 84·7%, 79% and 73·2% and for the gold crowns, 99%, 97·9%, 95·7%, 94·6% and 92·3%, respectively. The difference between the test and control group was statistically significant (P = 0·0027). The gold crowns showed a better marginal integrity with less marginal discoloration than the ceramic crowns. The most common failure in the ceramic crown group was fracture of the crown. The 60-month results of this prospective randomised controlled clinical trial suggest that the use of these shrinkage-free ZrSiO4 -ceramic crowns in posterior tooth restorations cannot be recommended.
本前瞻性随机对照临床试验的目的是评估在 5 年期间，ZrSiO4 陶瓷全冠在前磨牙和磨牙上的临床效果是否优于传统金冠。将 223 例患者纳入并随机分为两组。123 例患者用 123 个 ZrSiO4 陶瓷冠修复，100 例患者用 100 个金冠作为对照。所有冠均用玻璃离子水门汀常规粘固。经过 6、12、24、36、48 和 60 个月的观察期后，ZrSiO4 陶瓷无收缩冠的存活率（Kaplan-Meier）分别为 98.3%、92.0%、84.7%、79%和 73.2%，金冠分别为 99%、97.9%、95.7%、94.6%和 92.3%。实验组和对照组之间的差异具有统计学意义（P=0.0027）。金冠的边缘完整性优于陶瓷冠，边缘变色较少。陶瓷冠组最常见的失败是冠折。这项前瞻性随机对照临床试验的 60 个月结果表明，在后牙修复中使用这些无收缩 ZrSiO4 陶瓷冠不能被推荐。
