根管显微镜下离体上颌第一磨牙近中颊根第二根管的发现率比较  

More than 90% mesiobuccal 2nd canal (MB_2) be found by root canal microscope: a comparative study using extracted maxillary first molar

作　　者：沙鑫家[1] 孙汉堂[1] 张亚庆[1] 

机构地区：[1]第四军医大学口腔医学院,陕西西安710032

出　　处：《临床口腔医学杂志》2010年第1期27-29,共3页Journal of Clinical Stomatology

摘　　要：目的:比较根管显微镜下离体上颌第一磨牙近中颊根第二根管(MB2)的发现率与实际发生率的差异,为推广根管显微镜的临床应用提供依据。方法:离体上颌第一磨牙90个,分为两组,A组45个牙,采用改良开髓口,根管显微镜下探查寻找MB2并记录其发现率;B组45个牙,制成透明标本,观察近颊根的解剖形态,记录MB2的发生率,并与根管显微镜下MB2发现率相比较。结果:根管显微镜下A组MB2的发现率82.22%,透明牙标本B组显示的MB2发生率86.66%,二者之间不存在显著差异(P>0.05)。结论:使用根管显微镜,MB2的发现率接近于其实际发生率。Objective： To find whether there was any difference between the occurrence of mesiobuccal 2nd canal （MB2） and its detection rate with root canal microscope. Method： 90 extracted maxillary first molars were divided into 2 groups. In group 1, improved coronal cavities were prepared and root canal microscope was used to look for MB2 , and the detection rate of MB2 was calculated. 45 teeth in group 2 were used to make transparent specimens, anatomy of whose mesiobuccal roots was investigated, occurrence of MB2 was calculated and compared to the detection rate. Result： Detection rate with root canal microscope was 82.22 %, while according to the transparent specimens occurrence of MB2 was 86.66 %. No statistically significant discrepancy was found between the occurrences and detection rate（ =0.338 , P 0.05）. Conclusion： Detection rate of MB2 could be greatly improved by the use of root canal microscope.

关 键 词：根管显微镜 MB2 改良开髓口 

分 类 号：R781.05[医药卫生—口腔医学]