Chen Zhuo-Fan, Nang Pow Ho, Wang Yan, Luo Zhi-Bin
Department of Oral Implantology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China.
Ann R Australas Coll Dent Surg. 2008 Jun;19:67-70.
The development of new high strength ceramic abutments can enhance the overall aesthetic outcome of an implant-supported prosthesis. This study was to compare the clinical application of alumina and zirconia ceramic implant abutments in the anterior region. Twenty-three consecutive patients requiring single-tooth implants in the anterior region were randomized to receive either an alumina ceramic abutment (CeraAdapt) or a zirconia ceramic abutment. All-ceramic (IPS-Empress 2) crowns were then fabricated and cemented over the abutments with composite cement. Peri-implant mucosal health and bone levels were evaluated by the gingival index and radiographs at 2-week and 1-year follow-up. Aesthetic outcomes as well as technical problems with the restorations were evaluated during the observation period from 12 to 48 months after functional loading. A total of 17 alumina ceramic abutments and 18 zirconia ceramic abutments were evaluated. No patients dropped out during the study period. Eighteen out of the 23 patients maintained good function throughout the study. The median observation period was 21 months. Ceramic crown loosening was found in two restorations at 1-week and 2-years respectively after insertion. One ceramic crown fractured at 1 week after insertion. At 1-year follow-up, mean marginal bone loss around implants was 1.2 +/- 0.5 mm and the peri-implant mucosa in relation to abutment or crown was healthy with a mean gingival score of 0.6 +/- 0.2. All patients were satisfied with the final aesthetic outcome. However, two alumina abutments fractured after two years of loading. In conclusion, both ceramic abutments have shown a favourable biological response and aesthetic outcome; however, zirconia abutments with their superior mechanical properties might be better for supporting single-tooth implant restorations in the aesthetic zone.
新型高强度陶瓷基台的研发可提升种植体支持修复体的整体美学效果。本研究旨在比较氧化铝和氧化锆陶瓷种植基台在前牙区的临床应用情况。23例连续在前牙区需要单颗牙种植的患者被随机分为两组，分别接受氧化铝陶瓷基台（CeraAdapt）或氧化锆陶瓷基台。随后制作全瓷（IPS-Empress 2）冠，并使用复合树脂水门汀粘固于基台上。在术后2周和1年随访时，通过牙龈指数和X线片评估种植体周围黏膜健康状况和骨水平。在功能加载后12至48个月的观察期内，评估修复体的美学效果以及技术问题。共评估了17个氧化铝陶瓷基台和18个氧化锆陶瓷基台。研究期间无患者退出。23例患者中有18例在整个研究过程中保持良好功能。中位观察期为21个月。分别在植入后1周和2年发现两个修复体的陶瓷冠松动。1个陶瓷冠在植入后1周发生折断。在1年随访时，种植体周围平均边缘骨吸收为1.2±0.5 mm，种植体周围与基台或牙冠相关的黏膜健康，平均牙龈评分为0.6±0.2。所有患者对最终美学效果均满意。然而，两个氧化铝基台在加载两年后发生折断。总之，两种陶瓷基台均显示出良好的生物学反应和美学效果；然而，具有 superior 机械性能的氧化锆基台可能更适合支持美学区的单颗牙种植修复。 （注：superior 此处直接保留英文，可能是原文有误，推测应为“更好的”之类意思）
