Wasti F, Shearer A C, Wilson N H
Unit of Operative Dentistry and Endodontology, Turner Dental School, University Dental Hospital of Manchester, Higher Cambridge Street, Manchester M15 6FH, UK.
Int Endod J. 2001 Jun;34(4):263-6. doi: 10.1046/j.1365-2591.2001.00377.x.
The purpose of the present ex vivo study was to investigate variations in the root canal systems of mandibular and maxillary first permanent molar teeth of South Asian Pakistanis.
The root canal systems of a sample of 30 mandibular and 30 maxillary first permanent molar teeth extracted from South Asian Pakistanis were studied using a clearing technique.
The mesial roots of the mandibular molar teeth typically presented with two canals (97%) of type II, IV or VI configuration. The distal roots of these teeth presented with a single canal (50%) of type I or V configuration or with two canals (50%) of type II, IV or VI. The prevalence of four root canals in two-rooted mandibular first permanent molar teeth was 47%. In maxillary molar teeth the mesial roots with a single canal (47%) were type I or type V; those with two canals (53%) were type II, IV or type VI. The distal and palatal roots that presented as a single canal (100%) were type I or type V configuration. The prevalence of four root canals in three-rooted maxillary first permanent molar teeth was 53%.
It is concluded that four root canals in mandibular and maxillary first permanent molar teeth of South Asian Pakistanis is a common occurrence. The distribution of the different configurations of root canal systems in this population differed from that in Caucasian groups, suggesting that variations in root canal systems may be attributed to racial divergence.
本体外研究的目的是调查南亚巴基斯坦人下颌和上颌第一恒磨牙根管系统的变异情况。
采用透明技术研究了从南亚巴基斯坦人拔除的30颗下颌和30颗上颌第一恒磨牙样本的根管系统。
下颌磨牙的近中根通常有两条根管（97%），呈II型、IV型或VI型。这些牙齿的远中根有一条根管（50%），呈I型或V型，或有两条根管（50%），呈II型、IV型或VI型。双根下颌第一恒磨牙中四根根管的发生率为47%。在上颌磨牙中，单根管的近中根（47%）为I型或V型；双根管的近中根（53%）为II型、IV型或VI型。远中根和腭根呈单根管（100%），为I型或V型。三根上颌第一恒磨牙中四根根管的发生率为53%。
得出的结论是，南亚巴基斯坦人的下颌和上颌第一恒磨牙中有四根根管是常见现象。该人群根管系统不同形态的分布与白种人群不同，表明根管系统的变异可能归因于种族差异。
