【摘要】：目的研究下頜第一前磨牙僅用纖維樁主樁和主樁與輔樁聯(lián)合應(yīng)用時(shí),牙體及修復(fù)體所受應(yīng)力大小分布的影響。方法選擇19顆正常的離體下頜第一前磨牙,應(yīng)用錐形束CT(CBCT)掃描,獲取圖像,選取扁形單根管前磨牙1顆,經(jīng)根管治療及樁道預(yù)備此牙后,再次以相同條件進(jìn)行CBCT掃描,利用三維有限元法建立只應(yīng)用主樁的分析模型A及主樁與輔樁聯(lián)合應(yīng)用的模型B,分析不同載荷情況下牙體和修復(fù)體上的應(yīng)力大小及分布情況。結(jié)果當(dāng)受到與牙體長軸成相同角度的載荷時(shí),模型A和模型B的牙體組織和樁上的應(yīng)力大小及分布無明顯差異。同等大小的載荷,隨著加載角度增大,模型A和模型B牙體組織上應(yīng)力均明顯增大。結(jié)論輔樁對修復(fù)體應(yīng)力的影響不大,但隨著加載角度的增大,修復(fù)體上應(yīng)力明顯增大。
[Abstract]:Objective to study the effect of stress distribution on the mandibular first premolars when the primary post and the main post combined with the auxiliary post were used only in the first premolars of the mandible. Methods 19 normal mandibular first premolars in vitro were scanned with cone-shaped CT (CBCT), and one flat single-root premolar was selected. After root canal therapy and post canal preparation, CBCT scanning was performed under the same conditions. The three-dimensional finite element method is used to establish the analytical model A of the main pile and the model B of the combination of the main post and the auxiliary post. The stress size and distribution on the tooth and the prosthetic body under different loads are analyzed. Results there was no significant difference in stress size and distribution between model A and model B under the loading of the same angle as the long axis of tooth, and there was no significant difference in stress distribution between model A and model B. With the increasing of the loading angle, the stress on the tooth tissue of model A and model B increases obviously with the loading of the same size. Conclusion the influence of the auxiliary pile on the stress of the repaired body is not obvious, but with the increase of the loading angle, the stress on the repaired body increases obviously.
【作者單位】： 鄭州大學(xué)第一附屬醫(yī)院口腔修復(fù)科;許昌市中心醫(yī)院口腔科;
【分類號(hào)】：R783

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1 王慶;主樁與輔樁聯(lián)合應(yīng)用對扁形根管的前磨牙修復(fù)后應(yīng)力影響的有限元分析[D];鄭州大學(xué);2014年

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