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三种镍钛器械对根管初始工作宽度的适应性研究

发布时间:2018-02-12 10:57

  本文关键词: 根管初始工作宽度 根管初步预备 机用镍钛器械 器械折断 出处:《吉林大学》2015年硕士论文 论文类型:学位论文


【摘要】:目的: 因前牙和前磨牙的根管初始工作宽度较大,许多专家和厂家在指导镍钛器械使用和推介时指出就此类牙齿的根管不必进行完善的根管初步预备。针对这一问题,我们使用目前在临床上最常用的Protaper、Mtwo、Reciproc镍钛系统的第一支锉进入原始根管,通过X线片观察其进入的最大深度,来评价镍钛器械与根管初始工作宽度的适应性,为在临床根管预备过程中选择合理的器械提供依据。同时,对比在Pathfile镍钛器械进行根管初步预备后上述三种镍钛器械的第一支锉进入根管的深度差异,来探讨镍钛器械在根管预备前进行初步预备的必要性。 材料方法: 1.收集吉林地区成年人上下颌中切牙、侧切牙、尖牙、第一前磨牙、第二前磨牙、第一磨牙、第二磨牙各10颗,经预处理及截冠后将Protaper镍钛系统的S1号锉、Mtwo镍钛系统的10号锉、Reciproc镍钛系统的25号锉分别编号为P、M、R,在保持根管的原始形态下手动分别插入到所选离体牙中,感到阻力后停止插入,按照长焦距平行投照技术拍摄X线片,导入DFW数字成像软件系统,,测量各镍钛锉尖端距解剖根尖孔的长度L1。 2.将上述所有离体牙用Pathfile镍钛器械进行根管初步预备后,再分别将P、M、R手动插入到所选离体牙中,感到阻力后停止插入,按照长焦距平行投照技术拍摄X线片,导入DFW数字成像软件系统,测量各镍钛锉尖端距解剖学根尖孔的长度L2。与上述器械进入原始根管测得的长度L1进行比较,将两组实验结果进行统计学分析。 结果: 1.在上颌侧切牙,上颌第一磨牙MB、DB,上颌第二磨牙MB、DB,下颌中切牙,下颌侧切牙,下颌第一磨牙MB、ML,下颌第二磨牙MB、ML的根管中初步预备情况和三种镍钛器械类型之间存在协同作用(P0.001),即根管进行初步预备后对各类镍钛器械的使用效果有促进作用。在进行初步预备与未初步预备之间,各镍钛器械进入根管深度差异有统计学意义(P0.001),其中,P锉和M锉有统计学意义,R锉无统计学意义。 2.实验用所有组离体牙无论是否进行根管初步预备,镍钛器械类型均对测量值的差异有统计学意义(P0.001)。各镍钛器械类型的使用效果运用LSD法进行两两比较,由均值可得:M锉进入原始根管深度最大、P锉次之,R锉最小。其中在上颌中切牙、上颌尖牙、上颌第一磨牙P、上颌第二磨牙P、下颌尖牙、下颌第一前磨牙、下颌第二前磨牙、下颌第一磨牙D、下颌第二磨牙D的根管中测得的M锉尖端距解剖根尖孔长度均值小于0.5mm,即超出生理性根尖孔,说明M锉与上述各组根管初始工作宽度适应性差,在这里上颌尖牙组还包括P锉。 3.在上颌侧切牙、上颌尖牙、上颌第一磨牙、上颌第二磨牙、下颌中切牙、下颌侧切牙、下颌第一磨牙、下颌第二磨牙的根管中,无论初步预备情况和三种镍钛器械类型之间是否存在协同作用,根管进行初步预备与未进行初步预备情况对测量值的差异有统计学意义(P0.001),其中上颌尖牙组采用单因素统计分析。 结论: 1.所有组离体牙无论是否进行根管初步预备,三种镍钛系统中作为进入根管的第一支器械,Mtwo的10号锉进入根管深度最大,其次为Protaper的S1号锉,而Reciproc的25号锉效果不佳。其中在上颌中切牙、上颌尖牙、上颌第一磨牙P、上颌第二磨牙P、下颌尖牙、下颌第一前磨牙、下颌第二前磨牙、下颌第一磨牙D、下颌第二磨牙D的根管中发现Mtwo镍钛器械的10号锉与上述各组根管初始工作宽度适应性差,在这里上颌尖牙组还包括Protaper的S1号锉。 2.在上颌侧切牙、上颌尖牙、上颌第一磨牙、上颌第二磨牙、下颌中切牙、下颌侧切牙、下颌第一磨牙、下颌第二磨牙的根管中,使用Pathfile镍钛器械进行根管初步预备与未进行根管初步预备之间存在差异,初步预备后的效果较好。进行根管初步预备后,Protaper的S1号锉和Mtwo的10号锉再次进入根管的深度较Rrciproc的25号锉明显。 3.在本实验中,Reciproc单支锉系统其25号锉与上述14组牙位根管的初始宽度适应性较其他两种常规镍钛器械稍差。
[Abstract]:Objective:
Because of anterior teeth and premolar root canal initial working width is large, many experts and manufacturers in the guide and promote the use of nickel titanium instruments that such teeth root canal without complete root canal preliminary preparation. To solve this problem, we use the most commonly used in clinical Protaper, Mtwo, the first branch file Reciproc nickel titanium system into the original root canal, the maximum depth of entering through the observation of X-ray evaluation of nickel titanium instruments and root canal initial working width of adaptability, provide a basis for rational selection of clinical root canal preparation process equipment. At the same time, the first file comparison of root canal preparation after the preliminary three kinds of nickel titanium instruments in Pathfile nickel titanium instruments in different depth of the root canal, to explore the necessity of preliminary preparation of nickel titanium instruments in root canal preparation before.
Material methods:
Collect 1. adults in Jilin area on the mandibular incisors, lateral incisor, canine and first premolar and second premolar, first molar and second molar teeth 10, after pretreatment and crowns after Protaper nickel titanium system S1 file, Mtwo nickel titanium system No. 10 file, Reciproc nickel titanium system No. 25 file were numbered P, M, R, while maintaining the original form of the root canal manual were inserted into the selected teeth, was stopped after the insertion resistance, with long focal length parallel projection X-ray digital imaging system into DFW software, measuring the nickel titanium file from the anatomic root tip the length of the hole L1.
2. all the teeth with Pathfile nickel titanium instruments in root canal preparation and preliminary, respectively P, M, R manually inserted to the selected teeth, was stopped after the insertion resistance, with long focal length parallel projection X-ray digital imaging system into DFW software, and the length of L2. the instrument measuring the nickel titanium file from the apical tip of anatomy into the original root canal length measured by L1 were compared with two groups of experimental results were statistically analyzed.
Result锛

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