Department of Prosthetic Dentistry and Stomatognathic Physiology, Institute of Dentistry, University of Turku, Lemminkäisenkatu 2, 20520 Turku, Finland; Student Clinic Dentalia, Turku City Welfare Division, Lemminkäisenkatu 2, 20520, Turku, Finland.
Department of Prosthetic Dentistry and Stomatognathic Physiology, Institute of Dentistry, University of Turku, Lemminkäisenkatu 2, 20520 Turku, Finland; Student Clinic Dentalia, Turku City Welfare Division, Lemminkäisenkatu 2, 20520, Turku, Finland.
J Dent. 2018 Dec;79:96-101. doi: 10.1016/j.jdent.2018.10.012. Epub 2018 Oct 26.
The aim of this retrospective clinical study was to evaluate the survival and the occurrence of technical and biological complications of zirconia crowns and fixed dental prostheses made in the student clinic of Turku University, Finland, between April 2009 and September 2017.
Twenty-seven patients (19 female, 8 male), with zirconia crowns or FDPs, participated in the follow-up investigation. The mean age of patients was 64.6 years. Of the 40 restorations, 17 were single crowns and 23 FDPs. Twenty-seven restorations were anterior and 13 posterior. Restorations were investigated according to modified USPHS criteria.
The survival rate of zirconia restorations after 2-8 years (average 5.7 years) of clinical use was 95%. Survival rate of single crowns was 94.2% and of FDPs 95.7%, respectively. The overall complication rate was 26% for FDPs and 5.8% for crowns. One posterior crown was lost due to a vertical root fracture and one FDP showed a framework fracture. Veneering ceramic fractures were detected in 12% of all cases (0% for crowns and 22% for FDPs). Bleeding on probing was present in 38.1% of restored teeth and 13.9% of control teeth. Embrasure space was insufficient in 52% of zirconia FDPs and 81% of these restorations showed elevated BOP values.
Zirconia crowns and FDPs survived well in this retrospective follow-up study. Chipping of veneering ceramic and bleeding on probing were the most common complications. Thick connector areas made according to material demands resulted in insufficient embrasure spaces and inflammation of marginal gingiva.
本回顾性临床研究旨在评估 2009 年 4 月至 2017 年 9 月期间芬兰于韦斯屈莱大学学生诊所制作的氧化锆全冠和固定修复体的存活率以及技术和生物学并发症的发生情况。
27 名患者（19 名女性，8 名男性）参与了随访调查。患者的平均年龄为 64.6 岁。40 个修复体中，17 个为单冠，23 个为固定修复体。27 个修复体位于前牙区，13 个位于后牙区。修复体按照改良的 USPHS 标准进行检查。
氧化锆修复体在临床使用 2-8 年后（平均 5.7 年）的存活率为 95%。单冠的存活率为 94.2%，固定修复体的存活率为 95.7%。固定修复体的总体并发症发生率为 26%，单冠的并发症发生率为 5.8%。一颗后牙冠因根折而脱落，一颗固定修复体出现了支架折裂。所有病例中有 12%（单冠为 0%，固定修复体为 22%）的修复体出现了饰瓷崩裂。探诊出血在修复牙中为 38.1%，在对照牙中为 13.9%。52%的氧化锆固定修复体的邻间隙不足，其中 81%的修复体探诊出血阳性。
在本回顾性随访研究中，氧化锆全冠和固定修复体的存活率良好。饰瓷崩裂和探诊出血是最常见的并发症。根据材料要求制作的较厚的连接体区域导致邻间隙不足和边缘龈炎症。
