摘要
目的 研究中国人群中上颌磨牙近中颊根根管的解剖形态。方法 选取 1 38颗离体上颌磨牙 ,截去牙冠 ,完全暴露髓室底 ,用 0 8#号K锉疏通近中颊根MB及MB2 至根尖孔 ,并扩大至 1 5#号 ,对单根管但存在两个根尖孔的牙齿 ,从根尖孔方向用 0 8#号K锉逆行通畅根管 ,术前术后分别用数字X线机从近远中方向和颊腭向行诊断丝平行投照。结果 在 1 38颗离体牙中除了 2颗因根管钙化近中颊根MB不能完全用 0 8#号K锉疏通 ,其余1 36颗离体牙中近中颊根Ⅰ型根管有 47颗 (34 .6 % )、Ⅱ型根管有 46颗 (33 .8% )、Ⅲ型根管有 2 8颗 (2 0 .6 % )、Ⅳ型根管有 9颗 (5 .8% )、Ⅴ型根管有 6颗 (4.4% )。结论 中国人群中上颌第一、第二磨牙近中颊根双根管发生率为65 .4%。提示上颌磨牙近中颊根MB2 发生率很高 。
Objective To determine the percentage of anatomical canal configurations of the mesiobuccal root of the maxillary molar in Chinese patients.Methods One hundred and thirty-eight maxillary molars were obtained from dentists who knew absolutely that they were extracted from Chinese patients.The crown of the teeth were removed 1mm above the chamber bottom for searching MB 2 convenience.Preperative radiographs were taken from mesiodistal and buccopalatal directions for each tooth.08 #K files were placed through the orifice into MB&MB 2 until they were seen at the apex.The MB and MB2 were enlarged up to size 15 # file.If another canal opening was found at the apex,a 08 # file was inserted into the second opening and passed conveniently.Postoperative radiographs with file(s) in place were taken from two directions,as before.Results Of the 138 teeth,47( 34.6 )were type Ⅰ;46( 33.8 %) were TypeⅡ;28( 20.6 %)showed TypeⅢ;9( 6.6 %)showed TypeⅣ and 6( 4.4 %)were TypeⅤ.Conclusion The proportion of cases with two canals in the mesiobuccal root of maxillary molars from Chinese patients was 65.4 %.The results sugge that identification and treatment of MB 2 is important for successful clinical treatment.
出处
《现代口腔医学杂志》
CAS
CSCD
2003年第1期29-31,共3页
Journal of Modern Stomatology
