【摘要】 目的研究牙槽窝内保留颊侧部分牙根,对牙槽窝颊侧骨板高度及牙槽窝骨愈合速度的影响。方法选择4只成年Beagle犬双侧下颌及第二、三、四前磨牙的远中根作为实验位点。采用平行对照随机分为以下3组:(1)血液充盈组:拔除前磨牙远中根,血液充盈后关闭创口;(2)Bio-Oss Collagen组:拔除前磨牙远中根,牙槽窝内植入Bio-Oss Collagen,牙槽窝表面覆盖Bio-Gide,严密关闭创口;(3)部分牙根+血液充盈组:去除前磨牙远中根牙冠及牙根的舌侧部分,保留颊侧部分牙根,血液充盈牙槽窝后关闭创口。术后12周拍摄Beagle犬下颌锥形束CT(CBCT),比较颊侧骨板高度变化以及牙槽窝内的成骨情况。采用SPSS 21.0统计软件对颊侧骨板高度吸收量进行秩和检验,检验水准α=0.05。结果术后12周,血液充盈组颊侧骨板高度降低(1.63±0.67)mm,Bio-Oss Collagen组颊侧骨板高度降低(0.77±0.58)mm,部分牙根+血液充盈组颊侧骨板高度降低(0.06±0.10)mm。Bio-Oss Collagen组牙槽窝颊侧骨板吸收量小于血液充盈组,差异具有统计学意义(Z=-2.205,P=0.027),部分牙根+血液充盈组颊侧骨板吸收量小于血液充盈组,差异具有统计学意义(Z=-3.361,P=0.001),部分牙根+血液充盈组颊侧骨板吸收量小于Bio-Oss Collagen组,差异具有统计学意义(Z=-2.260,P=0.024)。术后12周血液充盈组牙槽窝中间区域显示低密影,Bio-Oss Collagen组牙槽窝高密影,形态与牙根轮廓相似,部分牙根+血液充盈组可见较多地松质骨影像。结论牙槽窝内保留颊侧部分牙根,相比牙槽窝内植入Bio-Oss Collagen,能更好地保存颊侧骨板高度。保留颊侧部分牙根具有促进牙槽窝内骨生成,加快牙槽窝骨愈合速度的作用。更多还原

【Abstract】 Objective To observe the buccal bone plate height and socket alteration with a buccal partial root in a tooth socket.Methods Four adult male Beagle dogs were used.Bilateral mandible the 2^nd to 4^thpremolar distal roots were randomly divided into three groups,i.e.,the group of blood filling（the root was extracted and the wound was sutured after blood filling）,the group of Bio-Oss Collagen（the root was extracted and the wound was filled with Bio-Oss Collagen and covered with Bio-Gide before suturing）and the group of buccal partial root combined with blood filling（the lingual partial root was removed while the buccal partial root was kept;the wound was sutured after blood filling）.CBCT analysis was carried out on the first day and 12^th week post operation.Vertical buccal bone plate alteration and osteogenesis effect in sockets were observed with the 12^thweek CBCT images.Statistical analysis was carried out with SPSS21.0 and the significance level was 0.05.Results The buccal bone plate height in the group of blood filling reduced（1.63±0.67）mm,while that of the group of Bio-Oss Collagen and the group of buccal partial root combined with blood filling was（0.77±0.58）mm and（0.06±0.10）mm,respectively.The vertical height alteration of buccal bone plate was much less in the group of Bio-Oss Collagen than the group of blood filling（Z=-2.205,P=0.027）.So was the group of buccal partial root combined with blood filling compared with the group of blood filling（Z=-3.361,P=0.001）and the group of buccal partial root combined with blood filling compared with the group of Bio-Oss Collagen（Z=-2.260,P=0.024）.The sockets were comparatively empty in the group of blood filling.High density bone graft substitute was observed in the group of Bio-Oss Collagen.Cancellous bone was observed in the group of buccal partial root combined with blood filling.Conclusions A buccal partial root resided in the tooth socket seems have a better ability to maintain the height of the buccal bone plate than Bio-Oss Collagen.A buccal partial root may accelerate new bone formation and be in favor of tooth socket healing.更多还原