Rwenyonyi Charles Mugisha, Kutesa Annet, Muwazi Louis M, Buwembo William
Department of Dentistry, Makerere University, P.O. Box 7072, Kampala, Uganda.
Odontology. 2009 Jul;97(2):92-6. doi: 10.1007/s10266-009-0100-0. Epub 2009 Jul 29.
We investigated root and canal morphology of permanent mandibular molar teeth in a Ugandan population. Mandibular first (n = 224) and second (n = 223) molars were collected from patients visiting dental clinics in Kampala and prepared by a clearing technique. An endodontic access cavity was prepared in each tooth. The teeth were consecutively immersed in 5% sodium hypochlorite, 10% nitric acid, and 99% methyl salicylate. India ink was coronally injected into the pulp chamber and withdrawn apically by suction. The teeth were viewed under a magnifying lens and the numbers of root canals and their configurations, lateral canals, intercanal communications, and multiple apical foramina were recorded, along with the number of roots and their morphology. Student's t test for independent samples was used to assess significant differences in the root canal system. All specimens were two-rooted with one mesial and one distal root. Root fusion was more frequent in the second than in the first molar: 3.2% versus 0.4%. Vertucci type IV canal configuration was most frequently recorded in the mesial root of the first (44.6%) and second (49.8%) molars. Type 1 canal configuration was predominant in the distal root in first (84.8%) and second (94.2%) molars. Multiple apical foramina were more frequent in the first than in the second molar, as were intercanal communications and lateral canals. Type I and IV canal configurations were predominant in the distal and mesial roots, respectively, of both the first and second molars.
我们研究了乌干达人群中恒下颌磨牙的根管形态。从坎帕拉牙科诊所就诊的患者中收集了下颌第一磨牙（n = 224）和第二磨牙（n = 223），并采用透明技术进行制备。在每颗牙齿上制备一个根管入口洞形。将牙齿依次浸入5%次氯酸钠、10%硝酸和99%水杨酸甲酯中。将印度墨汁从牙髓腔冠状方向注入，并通过抽吸从根尖方向吸出。在放大镜下观察牙齿，并记录根管数量及其形态、侧支根管、根管间交通支和多个根尖孔，以及牙根数量及其形态。采用独立样本的学生t检验来评估根管系统的显著差异。所有标本均为两根，一根近中根和一根远中根。第二磨牙的根融合比第一磨牙更常见：分别为3.2%和0.4%。在第一磨牙（44.6%）和第二磨牙（49.8%）的近中根中，最常记录到Vertucci IV型根管形态。在第一磨牙（84.8%）和第二磨牙（94.2%）的远中根中，I型根管形态占主导。第一磨牙的多个根尖孔、根管间交通支和侧支根管比第二磨牙更常见。I型和IV型根管形态分别在第一磨牙和第二磨牙的远中根和近中根中占主导。
