發(fā)布時間：2018-03-13 14:56

  本文選題：牙本質缺陷　切入點：微裂紋　出處：《安徽醫(yī)科大學學報》2017年06期 　論文類型：期刊論文

【摘要】：比較機用MTwo、TF、S3、ProTaper Next鎳鈦銼根管預備后,根管壁微裂紋的發(fā)生率。選用100例因正畸治療拔出的直根單根管的前磨牙,去除牙冠,自凝樹脂和藻酸鹽印膜材料包埋牙根。樣本隨機分5組(n=20),對照組不予處理,實驗組均預備根管至25號0.06錐度。預備完成后,分別與距根尖3、6、9 mm處與垂直于牙長軸將樣本切開,體式顯微鏡下觀察并記錄各橫截面上根管壁微裂紋的產生情況。結果顯示對照組未發(fā)現根管壁微裂紋,機用MTwo、TF、S3、ProTaper Next組根管壁微裂紋的發(fā)生率分別為30%、20%、10%、5%,前3組的發(fā)生率之間差異無統(tǒng)計學意義,機用MTwo、ProTaper Next組發(fā)生率之間差異有統(tǒng)計學意義(P=0.03)。結果表明:機用ProTaper Next鎳鈦銼根管預備后根管壁微裂紋的發(fā)生率較機用MTwo、TF、S3鎳鈦銼低;機用鎳鈦器械的橫截面接觸根管壁的點數目及位置分布與根管壁微裂紋的產生有相關性。
[Abstract]:To compare the incidence of microcracks in root canal wall after preparation of root canal with MTwoo TFS3Taper Next Next file, 100 cases of premolars of straight root canals extracted by orthodontic treatment were selected to remove crown. Autocoagulant resin and alginate film materials were used to embed the root. The samples were randomly divided into 5 groups (n = 20). The control group was not treated, and the experimental group were prepared for root canal to 25. 06 taper. After preparation, the samples were cut off from the root tip at a distance of 39 mm and perpendicular to the long tooth axis, respectively. The microcracks in the root canal wall of each cross section were observed and recorded under the posture microscope. The results showed that there were no microcracks in the root canal wall in the control group. The incidence of microcracks in the root canal wall in the Next group was 30%, and there was no significant difference in the incidence rate between the first three groups. The incidence of microcracks in the posterior root canal prepared by ProTaper Next nickel titanium file was lower than that in the machine using MTwoo Taper Next group. The results showed that the incidence of microcracks in the posterior root canal prepared by the ProTaper Next file was lower than that in the machine using the MTwoo Next TFT S3 file, the results showed that the incidence of microcracks in the posterior root canal was lower than that in the ProTaper Next file. The number and position distribution of the cross section contact root canal wall of the Nickel-Titanium instrument are related to the microcracks in the root canal wall.
【作者單位】： 鄭州大學口腔醫(yī)學院;
【基金】：河南省醫(yī)學科技攻關普通項目(編號:201403119)
【分類號】：R781.05

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本文編號：1606877