本文選題：根分叉部缺損 + 下頜磨牙�。� 參考：《北京大學(xué)學(xué)報(bào)(醫(yī)學(xué)版)》2017年01期

【摘要】：目的:利用錐形束計(jì)算機(jī)體層攝影術(shù)(cone beam computed tomography,CBCT)觀(guān)察下頜磨牙Ⅱ度和Ⅲ度根分叉病變區(qū)(furcation involvement,FI)近遠(yuǎn)中向的骨嵴形態(tài)和骨袋分布情況,并提出對(duì)骨嵴形態(tài)的分類(lèi)方法。方法:在既存的CBCT資料中,選取存在根分叉區(qū)水平向骨缺損的下頜磨牙進(jìn)行觀(guān)察,共納入81顆下頜磨牙,共計(jì)117處Ⅱ度或Ⅲ度根分叉病變。依據(jù)鄰面牙槽嵴頂連線(xiàn)與根分叉頂下方的牙槽嵴的位置關(guān)系,將根分叉區(qū)近、遠(yuǎn)中向的骨嵴形態(tài)分為凹陷型、水平型和凸出型,其中凹陷型又按照鄰面牙槽嵴頂?shù)倪B線(xiàn)與根分叉頂?shù)奈恢藐P(guān)系,分為亞型1(牙槽嵴頂連線(xiàn)位于根分叉頂冠方或同一水平)與亞型2(牙槽嵴頂連線(xiàn)位于根分叉頂?shù)母?,統(tǒng)計(jì)各類(lèi)型出現(xiàn)的比例,在CBCT的矢狀面圖像中觀(guān)察骨袋的分布情況。結(jié)果:在117處Ⅱ度和Ⅲ度FI中,水平型骨嵴形態(tài)出現(xiàn)的比例最高(64.10%),凸出型出現(xiàn)的比例最低(6.84%),凹陷型亞型1和亞型2出現(xiàn)的比例分別為13.68%和15.38%。有利于成骨的凹陷型亞型1的骨嵴形態(tài),在Ⅱ度FI中出現(xiàn)的比例為8.96%,在Ⅲ度FI中為20.00%;117處病損中,有31處合并骨下袋,其中29處骨下袋位于牙齒鄰面,其余2處位于根分叉區(qū),骨下袋出現(xiàn)的頻率在凹陷型亞型1中最高。結(jié)論:利用CBCT觀(guān)察下頜磨牙根分叉區(qū)近、遠(yuǎn)中向的骨嵴形態(tài)并進(jìn)行分類(lèi),有利于制定正確的治療方案,也可用于分析骨嵴形態(tài)與再生性治療成骨效果間的關(guān)系。
[Abstract]:Objective: using cone beam computed tomography (CBCT) to observe the shape of bone ridge and the distribution of bone bag in the proximal and distal part of mandibular molar (furcation involvement, FI), and put forward the classification method of bone ridge form. Method: in the existing CBCT data, the existence of the existence of root points is selected. A total of 81 mandibular molars were incorporated into the mandibular molar with horizontal bone defect. A total of 117 or third degree root bifurcations were included in the mandibular molar. According to the relationship between the crest line of the alveolar ridge and the alveolar ridge below the root, the root bifurcation area was divided into concave, horizontal and convex. According to the relationship between the line of the crest of the alveolar ridge and the position of the root bifurcate top, it is divided into subtype 1 (the top of the alveolar ridge is located at the root and the same level) and the subtype 2 (the root of the alveolar ridge is located at the root of the root). The distribution of the bone bag is observed in the sagittal image of the CBCT. The results are as follows: in 117 The proportion of horizontal type bone ridge in FI was the highest (64.10%), the proportion of the convex type was the lowest (6.84%), the proportion of the subtype 1 and the subtype 2 were 13.68% and 15.38%., respectively, 13.68% and the 15.38%., which were favorable for the bone crest form of the subtype subtype of the bone formation, the proportion in the second degree FI was 8.96%, and in the third degree FI was 20%; 117. Among the lesions, there were 31 subbone subbags, of which 29 were located in the adjacent surface of the teeth, the other 2 were located in the root bifurcate area, and the frequency of the subbone bag appeared in the subtype 1. Conclusion: CBCT was used to observe the near and distal bone ridge morphology of the mandibular grind root and to classify the bone ridge in the far middle. The relationship between the morphology of bone crest and the effect of regenerative osteogenesis was analyzed.
【作者單位】： 北京大學(xué)口腔醫(yī)學(xué)院·口腔醫(yī)院牙周科口腔數(shù)字化醫(yī)療技術(shù)和材料國(guó)家工程實(shí)驗(yàn)室口腔數(shù)字醫(yī)學(xué)北京市重點(diǎn)實(shí)驗(yàn)室;北京大學(xué)國(guó)際醫(yī)院口腔科;
【分類(lèi)號(hào)】：R781.4

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