[Early changes of interproximal ridge height with alveolar ridge preservation of maxillary single anterior teeth].

This study aimed to provide foundation for interproximal bone preservation to improve esthetic effects of inter-implant papillar by alveolar ridge preservation following tooth extraction of maxillary single anterior teeth.A total of 30 patients requiring maxillary single anterior teeth extraction were randomly divided into test and control groups (15 cases in each group). The test group underwent alveolar ridge preservation after tooth extraction (Bio-Oss bone powder was implanted in alveolar fossa and fixed with surface free gingival graft suture). No other treatment was performed on the control group after tooth extraction. All patients were scanned using cone beam computed tomography with personalized digital radiographic template at 7 days and 6 months after tooth extraction. Then, measurement of height changes at the interproximal and middle buccal was performed.At the mesial and distal interproximal site, ridge height reduction in the test group measured (0.358±0.151) mm, (0.322±0.180) mm, whereas that of control group reached (0.653±0.260) mm, (0.667±0.274) mm, indicating statistical significance (P<0.05). At the middle buccal site, the ridge height reduction of test group amounted to (0.826±0.307) mm, whereas that of control group totaled (1.510±0.625) mm, also presenting statistical significance (P<0.05).Alveolar ridge preservation can reduce absorption of alveolar crest height after tooth extraction, which could improve esthetic effects of inter-implant papillae gingiva.目的 探讨位点保存术对上颌单颗前牙拔除后邻面牙槽嵴高度早期变化的影响，为种植修复龈乳头美学效果提供参考依据。方法 选择需拔除上颌单颗前牙的30例患者为研究对象，将其随机分为试验组和对照组，每组15例。试验组在拔牙同时进行位点保存术（牙槽窝内植入 Bio-Oss骨粉，表面游离龈移植缝合固定），对照组拔牙后未行其他处理。术后7 d及术后6个月，佩戴个性化数字化放射导板行锥形束CT检查，测量2组近远中邻面牙槽嵴及唇侧中央牙槽嵴高度的变化。结果 试验组近中、远中邻面及唇侧中点的牙槽嵴吸收高度分别为（0.358±0.151）mm、（0.322±0.180）mm、（0.826±0.307）mm，对照组近远中邻面及唇侧中点的牙槽嵴吸收高度分别为（0.653±0.260）mm、（0.667±0.274）mm、（1.510±0.625） mm。统计分析表明，试验组的牙槽嵴吸收高度小于对照组（P<0.05），近中、远中邻面牙槽嵴的吸收高度均小于唇侧（P<0.05）。结论 位点保存术可以减少牙拔除后牙槽嵴高度的吸收，提高种植修复龈乳头美学效果。.