Pihlaja Juha, Näpänkangas Ritva, Raustia Aune
Dental student, Institute of Dentistry, University of Oulu, Oulu, Finland.
Senior Lecturer, Department of Prosthetic Dentistry and Stomatognathic Physiology, Institute of Dentistry, University of Oulu, Oulu, Finland; and Specialist, Oral and Maxillofacial Department, Oulu University Hospital, Oulu, Finland.
J Prosthet Dent. 2014 Oct;112(4):778-83. doi: 10.1016/j.prosdent.2014.03.008. Epub 2014 May 17.
Ceramic single crowns fabricated from newer materials, especially zirconia, have shown relatively high survival rates. However, early reversible complications may increase the risk of an irreversible failure later.
The purpose of the study was to evaluate the early complications and short-term failures of zirconia single crowns and partial fixed dental prostheses (FDPs) made by predoctoral dental students.
Data were collected from the patient records. Altogether, 264 zirconia single crowns and 120 FDPs (342 abutments and 190 pontics) were fabricated for 173 patients between 2007 and 2010. Early complications were recorded during the prosthetic treatment phase, and short-term failures were recorded during the first year in use.
The most frequent early complications were localized gingival irritation (1.9% of single crowns and 2.5% of FDP) and postoperative tooth sensitivity (0.4% of single crowns and 3.3% of FDPs). Pulp exposure during preparation was recorded in 3 abutment teeth of the FDPs. The most frequent short-term failure was chipping of the veneering porcelain (0.8% for single crowns, 0.8% for FDPs). One crown lost cementation because of poor retention (0.4%), and 2 FDPs failed because of framework fractures (1.7%).
The most frequent early complications were localized gingival irritation and postoperative tooth sensitivity, and the most frequent short-term failure was chipping of the veneering porcelain.
由新型材料制成的陶瓷单冠，尤其是氧化锆单冠，已显示出相对较高的存留率。然而，早期可逆性并发症可能会增加后期出现不可逆失败的风险。
本研究的目的是评估由牙科博士生制作的氧化锆单冠和部分固定义齿（FDP）的早期并发症和短期失败情况。
从患者记录中收集数据。2007年至2010年间，共为173例患者制作了264个氧化锆单冠和120个FDP（342个基牙和190个桥体）。在修复治疗阶段记录早期并发症，在使用的第一年记录短期失败情况。
最常见的早期并发症是局部牙龈刺激（单冠为1.9%，FDP为2.5%）和术后牙齿敏感（单冠为0.4%，FDP为3.3%）。在FDP的3个基牙预备过程中记录到牙髓暴露。最常见的短期失败是饰面瓷崩瓷（单冠为0.8%，FDP为0.8%）。1个单冠因固位不良而失去粘结（0.4%），2个FDP因支架折断而失败（1.7%）。
最常见的早期并发症是局部牙龈刺激和术后牙齿敏感，最常见的短期失败是饰面瓷崩瓷。
