平台转移设计种植体植入1年后下颌后牙区的骨丧失

背景：传统两段式种植体修复后种植体颈部牙槽骨的吸收一直被认为是种植术后的正常反应。目的：评价下颌后牙区两段式种植体应用平台转移设计后周围骨丧失情况。方法：50例患者共植入88颗种植体,实验组植入40颗Ankylos种植体,采用平台转移设计;对照组植入48颗3i种植体,采用传统对接设计。所有种植体均为潜入式植入,肩台均平齐牙槽嵴顶水平,3个月后完成最终修复。结果与结论：所有种植体均完成骨结合。与种植体植入时相比,功能负重12个月后,实验组种植体周围骨丧失高度为（0.31±0.39）mm,对照组种植体周围骨丧失高度为（0.94±0.43）mm,两者差异有非常显著性意义。随访期内,种植体无松动、脱落,牙龈组织健康,成功率为100%。结果显示种植体功能负重12个月后,平台转移设计可以减少种植体颈部骨吸收,保持种植体周围骨组织的稳定性。

Effect of platform switching technique on bone loss in the posterior area of the mandible in the first year following dental implantation

BACKGROUND：Peri-implant crestal bone resorption is considered as a normal reaction according to traditional butt-joint prosthesis around two-piece implants.OBJECTIVE：To evaluate bone loss around two-piece implants restored according to the platform switching concept in the posterior area of the mandible.METHODS：Eighty-eight implants were consecutively placed in 50 patients following submerged surgical protocol.In the test group,40 Ankylos implants were placed using platform switching technique,while 48 3i implants using traditional butt-joint in the control group.All the implants were positioned at the crestal level.Definitive prosthesis was delivered after 3 months.RESULTS AND CONCLUSION：All implants were judged to be successfully osseointegrated.The success rate was 100%.Twelve months after restoration,radiographic analysis showed an average bone reduction level of（0.31±0.39） mm in the test group that was statistically significantly different（P 0.01） from the average reduction in the control group [（0.94±0.43） mm].In the follow-up time,no implants were loose or lost and healthy gingival was seen.These findings show that the platform switching technique can reduce peri-implant crestal bone resorption and preserve alveolar bone level around dental implants 12 months after restoration.