Functional Anatomy Research Center, Laboratorio di Anatomia Funzionale dell’Apparato Stomatognatico, Dipartimento di Morfologia Umana e Scienze Biomediche – Città Studi, Università degli Studi di Milano, Milano, Italy.
Clinics (Sao Paulo). 2011;66(12):2063-70. doi: 10.1590/s1807-59322011001200011.
Zirconia-based prostheses are commonly used for aesthetic crown and fixed restorations, although follow-up data are limited, especially for implant-supported crowns. The aim of this study was to evaluate the three-year clinical results of the installation of 463 zirconia core crowns by a general dental private practice.
This study followed 142 patients (69 men and 73 women; aged 28-82 years) who had received 248 single crowns (202 tooth-supported, 36 implant-supported) and 225 multiple units of up to six elements (81 tooth-supported, 144 implant-supported). Clinical events, including fracture and loss of retention, secondary caries, and marginal integrity, were recorded. The overall failure rate was computed for the fractured and lost prostheses. Aesthetic, functional, and biological properties were rated, and patient satisfaction was investigated.
During the three-year follow-up period, four patients were lost from the study (18 crowns, 4% of the total crowns). Three of the zirconia prostheses suffered fractures in more than three units (11 crowns; one- vs. three-year follow-up, p<0.05, Wilcoxon signed-rank test), and the cumulative prosthesis survival rate was 98.2%. Twelve units lost retention and were re-cemented, and no secondary caries of the abutment teeth were reported. The aesthetic, functional, and biological properties were generally well-rated, and there were no differences between tooth- and implant-supported crowns. The lowest scores were given regarding the anatomical form of the crowns, as some minor chipping was reported. Relatively low scores were also given for the periodontal response and the adjacent mucosa. Overall, patient satisfaction was high.
At the three-year follow-up, the zirconia-core crowns appeared to be an effective clinical solution as they had favorable aesthetic and functional properties. Only the marginal fit of the prostheses should be improved upon.
氧化锆基修复体常用于美学冠和固定修复，但随访数据有限，尤其是对于种植体支持的冠。本研究旨在评估一家私人牙科诊所安装 463 个氧化锆核冠三年的临床效果。
本研究随访了 142 名患者（69 名男性和 73 名女性；年龄 28-82 岁），他们接受了 248 个单冠（202 个牙支持，36 个种植体支持）和 225 个多达六个单元的多个单位（81 个牙支持，144 个种植体支持）。记录了临床事件，包括骨折和固位丧失、继发龋和边缘完整性。计算了断裂和丢失修复体的总失败率。评价了美学、功能和生物学性能，并调查了患者满意度。
在三年的随访期间，有 4 名患者失访（18 个冠，占总冠的 4%）。三个氧化锆修复体有三个以上单位骨折（11 个冠；一年与三年随访，p<0.05，Wilcoxon 符号秩检验），累积修复体存活率为 98.2%。有 12 个单位失去固位力并重新粘固，未报告基牙继发龋。美学、功能和生物学性能普遍评价良好，牙支持和种植体支持的冠之间无差异。冠的解剖形态评分最低，报告了一些轻微的崩瓷。牙周反应和相邻黏膜的评分也相对较低。总的来说，患者满意度很高。
在三年的随访中，氧化锆核冠似乎是一种有效的临床解决方案，因为它们具有良好的美学和功能特性。仅需改进修复体的边缘适合性。
