不同镍钛旋转器械平解剖性根尖孔长度预备根管后根尖孔表面形态变化的研究  

Study of Apical Surface Morphology after Root Canal Preparation with Different Kinds of Nickel-titanium Instruments Horizontal to the Anatomic Apical

作　　者：刘宗响 刘艺[2] 段君兰 王鹏来 陈红莲 

机构地区：[1]徐州市口腔医院牙体牙髓病科,江苏徐州221002 [2]徐州医学院口腔学院 [3]徐州市口腔医院颌面外科

出　　处：《口腔医学研究》2015年第5期485-489,共5页Journal of Oral Science Research

基　　金：江苏省徐州市科技计划项目(编号:XM12B065)

摘　　要：目的:研究不同镍钛旋转器械在平解剖性根尖孔长度时预备根管后根尖孔表面形态的变化。方法:选取因牙周病拔除的离体牙40颗,随机分为两组并在扫描电子显微镜下拍摄术前片,记录根尖孔表面形态;分别采用K3锉、TF锉在工作长度下(平解剖性根尖孔长度)预备根管,扫描电子显微镜下观察并记录预备后根尖孔表面形态的变化:记录根尖孔的偏移、根尖孔周围牙骨质缺损及根尖孔周围表面的裂纹。结果:K3组、TF组根管预备后均存在根尖孔的偏移、牙骨质的缺损及根尖孔周围表面的裂纹,其中根尖孔的偏移的样本数目、根尖孔周围牙骨质缺损样本数目两组之间存在统计学差异(P<0.05),根尖孔周围表面裂纹样本数两组之间无统计学差异。结论:K3、TF两种镍钛旋转器械在平解剖性根尖孔长度下预备根管时由于超根尖止点预备,均可导致根尖孔偏移,根尖孔周围的牙骨质缺损及根尖孔表面裂纹线产生,与K3锉相比,TF锉在减少根尖孔偏移及根尖孔周围牙骨质缺损方面更具优越性。Objective：To study the apical surface morphology after root canal preparation with different nickel-titanium instruments horizontal to the anatomic apical.Methods：40freshly extracted tooth due to periodontal disease which were randomized to 2groups were taken images by SEM to record the apical surface morphology.Then they were prepared with K3 or TF respectively under Work Length（horizontal to the anatomical apical foramen）.After root preparation,the apical surface morphology of each tooth was observed by SEM,then the apical foramen shift,dentin defects and crackle surrounding the apical foramen was recorded.Results：The apical foramen diversifications（include apical foramen shift,dentin defects and crackle）were observed in both K3 group and TF group.The difference of apical foramen shift and crackle number between two groups didn’t have statistically significant while the numbers of tooth which had dentin defects between two groups have statistically significant（P〈0.05）.Conclusion：The integrity of the apical foramen would be destroyed after root canal preparation with two kinds of nickel-titanium instruments horizontal to the anatomic apical maybe due to super the apical foramen.The surface morphology of apical foramen would have a lot of diversifications include apical foramen shift,dentin defects and crackle cracks and dentin defects surrounding the apical.Compare with k3 file,TF file group have less apical foramen shift and dentin defects.

关 键 词：镍钛旋转器械 根管预备 根尖孔形态 解剖性根尖孔长度 

分 类 号：R781.05[医药卫生—口腔医学]