Owall B, Cronström R
Department of Prosthetic Dentistry, School of Dentistry, Faculty of Health Sciences, University of Copenhagen, Denmark.
Acta Odontol Scand. 2000 Apr;58(2):72-6. doi: 10.1080/000163500429316.
This study is an analysis of fixed partial dentures (FPDs), 8 units or more, that failed or suffered severe complications within the first 2 years after cementation. The material consists of claims to the Swedish Guarantee Insurance for Fixed Prosthodontics. Claim reports, radiographs, etc. were available. Over a 6-month period, 36 FPDs were sampled, 34 of which were made by general practitioners. The sampling resulted in 41 complications in 26 maxillary and 10 mandibular FPDs, 29 of which were made in metal-ceramics. The mean extension was 10.9 units, with an abutment/pontic ratio of 1.4; 40.6% of the abutments were root-canal treated and supplied with root posts. The complications were: metal framework fractures 41%, loss of retention 24%, porcelain fractures 17%, tooth/root fractures 10%, and miscellaneous 7%. The high proportion of metal framework fractures is not in accordance with other studies of FPD complications. No factor that could explain this high frequency could be identified. The fact that the selection of FPD complications applied to the first 2 years only, that the FPDs had been constructed by general practitioners, and that there were many root-canal-treated abutments and distal extension cantilever pontics, might be factors of importance.
本研究分析了8单位及以上的固定局部义齿（FPD），这些义齿在黏固后的头两年内出现失败或严重并发症。材料包括向瑞典固定修复担保保险公司提出的索赔。索赔报告、X光片等资料均有。在6个月的时间里，抽取了36例FPD，其中34例由全科医生制作。抽样结果显示，26例上颌FPD和10例下颌FPD出现了41例并发症，其中29例为金属烤瓷修复体。平均延伸单位为10.9，基牙/桥体比例为1.4；40.6%的基牙经过根管治疗并配有桩核。并发症包括：金属支架断裂41%，固位丧失24%，瓷裂17%，牙齿/牙根折断10%，其他7%。金属支架断裂的高比例与其他关于FPD并发症的研究结果不一致。未发现能解释这一高频率的因素。仅将FPD并发症的选择应用于头两年、FPD由全科医生制作、存在许多经过根管治疗的基牙以及远中延伸悬臂桥体等情况，可能是重要因素。
