Nejatidanesh Farahnaz, Moradpoor Hedayat, Savabi Omid
Dental Materials Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Department of Prosthodontics, Kermanshah University of Medical Sciences, Kermanshah, Iran.
Clin Oral Investig. 2016 Jan;20(1):169-78. doi: 10.1007/s00784-015-1479-3. Epub 2015 Apr 25.
Zirconia-based restorations have been increasingly used on implant and teeth abutments, but the evidence about clinical outcomes of these restorations is limited. The aim of this study was to assess up to 7-year clinical outcomes of implant- and tooth-supported zirconia-based single crowns.
In this retrospective study, 261 patients with 556 single crowns supported by either teeth (324) or implants (232) were examined during 3- to 7-year follow-up (mean observation of 60.70 months for tooth and 59.20 months for implant-supported crowns). California Dental Association (CDA) quality evaluation system was used to evaluate the restorations. Soft tissue status was assessed using plaque and gingival index scores, bleeding on probing, and pocket depth. Patient and professional satisfaction were evaluated by visual analog scale (VAS).
The 5-year Kaplan-Meier survival probability was 98.3 and 97.3 for implant- and tooth-supported crowns, respectively. In regard to CDA rating, most of the crowns were ranked as either excellent or acceptable (99.5 %). The recorded failures were replacement of the crown due to porcelain chipping (3), implant failure (1), and teeth extraction (5). Soft tissue parameters were not affected by the restorations compare to control teeth. The VAS was high for both patients and clinicians.
Zirconia-based single crowns on both tooth and implant abutments showed promising clinical performance in this up to 7-year follow-up.
The zirconia-based single crowns can be used clinically for tooth- and implant-supported restorations.
基于氧化锆的修复体已越来越多地用于种植体和牙基台上，但关于这些修复体临床效果的证据有限。本研究的目的是评估种植体和牙支持的基于氧化锆的单冠修复长达7年的临床效果。
在这项回顾性研究中，对261例患者的556个单冠进行了检查，这些单冠由牙齿（324个）或种植体（232个）支持，随访时间为3至7年（牙齿支持的冠平均观察60.70个月，种植体支持的冠平均观察59.20个月）。采用加利福尼亚牙科协会（CDA）质量评估系统对修复体进行评估。使用菌斑和牙龈指数评分、探诊出血和牙周袋深度评估软组织状况。通过视觉模拟量表（VAS）评估患者和专业人员的满意度。
种植体支持的冠和牙齿支持的冠5年的Kaplan-Meier生存率分别为98.3%和97.3%。关于CDA评级，大多数冠被评为优秀或可接受（99.5%）。记录的失败情况包括因瓷片崩裂而更换冠（3例）、种植体失败（1例）和拔牙（5例）。与对照牙相比，修复体对软组织参数没有影响。患者和临床医生的VAS评分都很高。
在这项长达7年的随访中，基于氧化锆的牙齿和种植体基台单冠均显示出良好的临床性能。
基于氧化锆的单冠可在临床上用于牙齿和种植体支持的修复。
