Department of Prosthodontics, College of Medicine, University of Ulsan, Asan Medical Center, Seoul, Korea.
J Oral Rehabil. 2013 Aug;40(8):595-602. doi: 10.1111/joor.12065. Epub 2013 May 16.
This retrospective study evaluated the 5-year cumulative survival rate and complication rates of a 4·0-mm internal connection implant (MicroThread™ Osseospeed™, Astra Tech) installed for single-tooth restoration. The patients who were treated at Asan Medical Center between 2006 and 2007 were included in this study. A life table analysis was used to calculate the 5-year cumulative survival rate. Comparisons of cumulative survival rates among implant position (anterior, premolar and molar), jawbone (maxilla, mandible), gender and prosthesis type (screw-retained, cement-retained) were performed using the log-rank test. Post-loading complications were analysed using Fisher's exact test. Twelve of 136 implants (anterior; 22, premolar; 25, molar; 89) were lost during the loading period, and 11 were removed due to coronal fracture of fixture. The 5-year cumulative survival rate of the whole arch was 91·9%, and that of the molar region was 87·6%. Statistically significant differences were observed in cumulative survival rates among implant position (P = 0·037), whereas no statistically significant differences were observed among gender, jawbone, prosthesis type. Forty-seven of 114 (41·2%) implants in the posterior region showed post-loading complications, including coronal fracture of fixture and abutment screw loosening.
本回顾性研究评估了用于单颗牙修复的 4.0mm 内连接种植体（MicroThread™ Osseospeed™，AstraTech）的 5 年累积存活率和并发症发生率。本研究纳入了 2006 年至 2007 年期间在 Asan 医疗中心接受治疗的患者。采用寿命表分析法计算 5 年累积存活率。使用对数秩检验比较种植体位置（前牙、前磨牙和磨牙）、颌骨（上颌骨、下颌骨）、性别和修复体类型（螺丝固位、粘结固位）的累积存活率。使用 Fisher 确切检验分析加载后的并发症。在加载期间，136 个种植体中有 12 个（前牙 22 个，前磨牙 25 个，磨牙 89 个）丢失，其中 11 个因固位体冠部断裂而被取出。全弓的 5 年累积存活率为 91.9%，磨牙区为 87.6%。种植体位置的累积存活率存在统计学显著差异（P=0.037），而性别、颌骨、修复体类型之间无统计学显著差异。后牙区 114 个种植体中有 47 个（41.2%）出现加载后并发症，包括固位体和基台螺丝松动的冠部断裂。
