Assistant Teacher, Department of Prosthodontics, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia.
Professor, Division of Dental Biomaterials, Center for Dental and Oral Medicine, Clinic for Reconstructive Dentistry, University of Zürich, Zürich, Switzerland.
J Prosthet Dent. 2022 Dec;128(6):1258-1264. doi: 10.1016/j.prosdent.2021.02.034. Epub 2021 Apr 24.
Monolithic zirconia restorations have been evaluated with in vitro studies, but limited clinical evidence of their longevity and reliability is available.
The purpose of this clinical study was to evaluate the clinical performance of posterior multiunit glazed monolithic zirconia fixed dental prostheses.
A total of 20 participants received 33 monolithic posterior zirconia fixed dental prostheses (Zolid white; Amann Girrbach AG) with minimally invasive preparations. Bilaterally supported fixed dental prostheses with a connector area of at least 9 mm were luted with resin-modified glass ionomer cement. The clinical evaluations were performed after 1 week, 6 months, and then annually after completion of the treatment. The biologic outcomes were evaluated by assessing the pocket depth, attachment level, plaque control, bleeding on probing, caries, and tooth vitality. Esthetics and the functional performance of the prostheses (color match, cavosurface marginal discoloration, anatomic form, marginal adaptation) were evaluated as per the rating scales of Cvar and Ryge. An analysis of survival was made by using the Kaplan-Meier method.
After 39.8 ±16.7 months of observation, the overall survival rate of the monolithic zirconia multiunit posterior prostheses was 93.9%. No caries were found on the abutment teeth, signs of gingivitis were noted in 1 participant after 24 months, and increased probing depths of the abutment teeth were detected in 5 prostheses (15.1%). No loss of retention was detected. Two prostheses had to be replaced: 1 because of a biologic complication and 1 because of a technical complication. The remaining 31 prostheses received Alfa scores for marginal adaptation, cavosurface marginal discoloration, and caries. Twenty-seven (87.1%) prostheses were rated as Alfa and 4 (12.9%) as Bravo for anatomic form. The color match was noted as Alfa in 15 (48.3%) prostheses, and 16 (51.6%) were rated as Bravo.
Monolithic zirconia restorations demonstrated a reliable treatment option after medium-term clinical use for the replacement of missing posterior teeth.
整体氧化锆修复体已通过体外研究进行了评估，但有关其长期耐用性和可靠性的临床证据有限。
本临床研究的目的是评估后牙多单位上釉整体氧化锆固定义齿的临床性能。
共有 20 名参与者接受了 33 个整体氧化锆后牙固定义齿（Zolid white；Amann Girrbach AG）的微创修复。采用树脂改性玻璃离子水门汀黏结双侧支持的固定义齿，连接体区域至少 9mm。临床评估在治疗完成后 1 周、6 个月后和每年进行。通过评估牙周袋深度、附着水平、菌斑控制、探诊出血、龋齿和牙齿活力来评估生物学结果。根据 Cvar 和 Ryge 的评分标准评估修复体的美观和功能性能（颜色匹配、牙体表面边缘变色、解剖形态、边缘适应性）。采用 Kaplan-Meier 法进行生存分析。
在 39.8±16.7 个月的观察期后，整体氧化锆多单位后牙修复体的总体生存率为 93.9%。基牙无龋齿，1 名参与者在 24 个月时出现牙龈炎迹象，5 个基牙的探诊深度增加（15.1%）。未发现固位丧失。有 2 个修复体需要更换：1 个是因为生物学并发症，1 个是因为技术并发症。其余 31 个修复体的边缘适应性、牙体表面边缘变色和龋齿获得 Alfa 评分。27 个（87.1%）修复体的解剖形态被评为 Alfa，4 个（12.9%）被评为 Bravo。15 个（48.3%）修复体的颜色匹配被评为 Alfa，16 个（51.6%）被评为 Bravo。
在中短期临床应用中，整体氧化锆修复体在后牙缺失的修复中是一种可靠的治疗选择。
