Monaco Carlo, Caldari Mauro, Scotti Roberto
Int J Prosthodont. 2015 May-Jun;28(3):236-8. doi: 10.11607/ijp.4023.
The aim of this retrospective cohort study was to evaluate the clinical performance of tooth-supported zirconia-based fixed dental prostheses (FDPs) made by 15 members of the Italian Academy of Prosthetic Dentistry over a time period of up to 5 years.
Ninety-eight patients were treated with a total of 137 zirconia-based FDPs in anterior and posterior regions using primarily chamfer or knife-edge tooth preparations. The cohort group with parafunctional habits was compared with patients without parafunctional habits according to the esthetic, functional, and biologic United States Public Health Service criteria modified by the FDI World Dental Federation.
The estimated cumulative survival of all restorations was 94.70% ± 1.25% standard error (SE), whereas the estimated cumulative success decreased to 89.78% ± 2.58 SE. Mechanical failures, including three zirconia framework fractures, two hairline cracks, nine chippings, and one delamination of the ceramic veneering, were recorded during the 1- to 5-year observation period. An odds ratio of 2.02 (95% confidence interval: 0.67 to 6.12) showed a moderate association between parafunction and failure.
Zirconia-based tooth-supported FDPs showed promising clinical results over a period of up to 5 years. Technical complications were more commonly detected in patients with parafunctional habits.
这项回顾性队列研究的目的是评估意大利口腔修复学会15名成员制作的牙支持氧化锆基固定义齿（FDP）在长达5年的时间内的临床性能。
98例患者共接受了137颗氧化锆基FDP修复，修复部位包括前牙区和后牙区，主要采用肩台或刃状牙体预备。根据由国际牙科联合会修改的美国公共卫生服务美学、功能和生物学标准，将有异常功能习惯的队列组与无异常功能习惯的患者进行比较。
所有修复体的估计累积生存率为94.70%±1.25%标准误（SE），而估计累积成功率降至89.78%±2.58 SE。在1至5年的观察期内记录到机械故障，包括3例氧化锆框架骨折、2例发丝状裂纹、9例崩瓷和1例陶瓷贴面分层。优势比为2.02（95%置信区间：0.67至6.12），表明异常功能与修复体失败之间存在中度关联。
牙支持氧化锆基FDP在长达5年的时间内显示出良好的临床效果。技术并发症在有异常功能习惯的患者中更常见。
