钛镍记忆合金牵张器牵张增高牙槽嵴的动态研究

目的:通过对犬牵张手术后的下颌牙槽嵴高度、骨密度和组织学变化进行动态研究,了解应用钛镍记忆合金牵张器牵张成骨增高牙槽嵴的变化规律。方法:牵张增高牙槽嵴的15只犬于术前、术后1周、5周、3个月、6个月分别测量术区及对照侧相应位置颌骨高度,拍X线片,取牵张区及对照侧相同区域骨块进行双能X线骨密度测量并进行组织学研究。结果:牙槽嵴增高高度在牵张术后1、3、6个月分别减少5%、8%、11%。牵张术后3个月,牵张区骨密度低于对照侧;6个月,与对照侧的差异无显著性。结论:使用TiN i-SMA牵张器增高牙槽嵴成骨迅速,再吸收程度较低,成骨形态满意。牵张成的新骨有足够的强度,可以满足种植等后期修复的要求。

Healing process after alveolar ridge distraction with TiNi-SMA distractor

Objective:To observe the osseous healing process after alveolar ridge distraction with TiNi-SMA distractor and to evaluate the new bone's quality.Methods: 15 canines were divided into three groups,and being killed accordingly 1,3 and 6 months after distraction.The mandibles were examined clinically,radiologically,and histologically.Results: 1,3 and 6 months after distraction,the height of the augmented alveolar ridge decreased 5%,8% and 11% accordingly.Bone mineral density was lower than the blank control three months after distraction.But the index increased and showed no significant difference six months after distraction.Conclusion:The healing process after alveolar ridge distraction with TiNi-SMA distractor performs well and the new bone is strong enough for secondary implant placement.