【摘要】 目的:评价下后牙区种植体植入深度对于种植体颈部边缘骨水平的影响并探讨其临床意义。方法:2000年8月至2006年12月就诊于北京大学口腔医学院种植中心的下牙列缺损患者46名(男20人,女26人),共111枚Ankylos种植体纳入研究;分别测量每个种植体植入时,以及修复完成并负重至少三年后的曲面断层片,评估种植体颈部边缘骨水平的变化及差异;观察时间为36至85个月,平均58.1个月。结果:植入种植体水平低于、平齐或高于骨面,边缘骨吸收的绝对值无显著性差异(α=0.05);经过功能性负重后,植入于骨面以下的位点中有67.7%边缘骨稳定于肩台水平或之上,32.3%吸收于平台之下;植入平齐骨面的位点分别为19.7%和80.3%,两者差异具有显著性(p<0.001,α=0.05)。结论:植入水平低于牙槽嵴顶有利于维持种植体颈部边缘骨组织长期(3年以上)稳定于种植体肩台水平。更多还原

【Abstract】 The purpose of this study was to evaluate the influence of the place depth of the implants with platform switching (Ankylos) on the marginal bone remodeling,by means of retrospective radiological observation.Methods and materials:111 Ankylos implants in the posterior mandible from 46 patients,20 male and 27 female were enrolled in this study.Followed up by 58.1 months for average (from 36 to 85),222 mesial and distal sites of these implants were evaluated by means of measuring the level of the marginal bone (LMB) on the panoramic radiograph.Results:Among these 111 successvully functional loaded implants,there were no significant differences with the marginal bone absorption values,no matter the implants were placed below,at,or above the bone level (α=0.05).Concerning the stabilization of the marginal bone,when placed below the bone level,67.7% of the implant sites had their LMBs stabilized at or above the implant platform,and 23.3% absorbed vertically,respectively 19.7% and 80.3% when placed at the bone level,with significant difference (p<0.001,α=0.05).Conclusions:Based on a long-term (over 3 years) observation,the implants placed below,as compared to at or above,the alveolar crest level,might have more chance to keep the marginal bone stabilized at or above the implant platform.更多还原