CAJ | 학술논문

目的：掌握维吾尔族人下颌第一恒磨牙的解剖特点。方法采集维吾尔族人离体下颌第一恒磨牙105颗，锥形束 CT（cone-beam，CT）法观测牙根变异及根管分类（Weine 分类）；挑选出牙体完整的离体牙标本63颗，游标卡尺法测量8项牙体形态参数。结果维吾尔族人下颌第一恒磨牙牙齿总长度均值为18．9 mm，近中根长度均值为13．9 mm，远中根长度均值为12．8 mm；以双根型最多见（94．3％），三根型发生率较少（5．7％），未检出单根型；近中根根管多为2-2型（83．8％），远中根多为1-1型（84．8％）。结论维吾尔族人下颌第一恒磨牙牙根及根管形态的变异度较低。
목적：장악유오이족인하합제일항마아적해부특점。방법채집유오이족인리체하합제일항마아105과，추형속 CT（cone-beam，CT）법관측아근변이급근관분류（Weine 분류）；도선출아체완정적리체아표본63과，유표잡척법측량8항아체형태삼수。결과유오이족인하합제일항마아아치총장도균치위18．9 mm，근중근장도균치위13．9 mm，원중근장도균치위12．8 mm；이쌍근형최다견（94．3％），삼근형발생솔교소（5．7％），미검출단근형；근중근근관다위2-2형（83．8％），원중근다위1-1형（84．8％）。결론유오이족인하합제일항마아아근급근관형태적변이도교저。
Objective To investigate the anatomic features of the permanent mandibular first molars in the Uyghur people.Methods A total of 105 extracted permanent mandibular first molars in Uyghur people were collected and scanned by CBCT.The variations of the roots and canals were determined by the num-ber of the roots and the Weine′s root canal classification respectively.63 molars without defections were chosen and 8 odontometric parameters were measured with a digital caliper.Results The mean value of the complete teeth length of the permanent mandibular first molars was 18.9 mm,and the mean length of the mesial and distal roots were 13.9 mm and 12.8 mm;the permanent mandibular first molars were usual-ly two-rooted (94.3%),and the incidence of the three-rooted form was only 5.7%.Single-rooted molar was not observed;the mesial root usually contained a type 2-2 canal,with an incidence of 83.8%,whereas the distal root more frequently had a type 1-1 canal (84.8%).Conclusions The root and canal variations of the permanent mandibular first molars in the Uyghur people were less frequent than those in the Han Chi-nese people.Understanding the anatomic features of the teeth in different ethnic groups can be useful for clinical dental treatments.