CAJ | 학술논문

目的：通过应用多层螺旋CT观察分析内蒙古地区成人下颌第一磨牙的根管形态及其变异情况,为临床治疗提供解剖学依据,同时探讨下颌第一磨牙根管形态是否存在性别与民族差异。方法：筛选内蒙古地区符合双侧健康下颌第一磨牙标准的蒙汉族成年人66名,共132颗下颌第一磨牙进行研究,应用多层螺旋CT扫描,利用Release 4.4后处理软件进行三维重建,分析下颌第一磨牙根管形态。结果：下颌第一磨牙2根发生率67.6%,3根发生率33.3%,2根2根管发生率6.1%,2根3根管发生率42.4%,2根4根管发生率18.2%,3根3根管发生率7.6%,3根4根管发生率25.7%。下颌第一磨牙远中舌根个体发生率33.3%,男女性别间发生率无统计学差异(P>0.05),蒙汉族间发生率有统计学差异(P<0.05)。结论：内蒙古地区成人下颌第一磨牙牙根及根管形态多样且具有较大的变异性,同时变异存在民族差异。
목적：통과응용다층라선CT관찰분석내몽고지구성인하합제일마아적근관형태급기변이정황,위림상치료제공해부학의거,동시탐토하합제일마아근관형태시부존재성별여민족차이。방법：사선내몽고지구부합쌍측건강하합제일마아표준적몽한족성년인66명,공132과하합제일마아진행연구,응용다층라선CT소묘,이용Release 4.4후처리연건진행삼유중건,분석하합제일마아근관형태。결과：하합제일마아2근발생솔67.6%,3근발생솔33.3%,2근2근관발생솔6.1%,2근3근관발생솔42.4%,2근4근관발생솔18.2%,3근3근관발생솔7.6%,3근4근관발생솔25.7%。하합제일마아원중설근개체발생솔33.3%,남녀성별간발생솔무통계학차이(P>0.05),몽한족간발생솔유통계학차이(P<0.05)。결론：내몽고지구성인하합제일마아아근급근관형태다양차구유교대적변이성,동시변이존재민족차이。
Objective:To provide the anatomy reference about the basic clinical therapy and explore the mandibular first molars whether there are differences between genders or nationalities, by using multi-slice computed tomography to evaluate root and canal morphology. Methods:A total of 66 Mongolian and Hans adults with healthy, well-developed mandibular first molars were included. Totally,a number of 132 mandibular first molars were studied. The root and canal morphology were evaluated by multi-slice computed tomography scanning, the data was imported into workstation and made research on image reconstruction and multiplanar reconstruction by Release 4. 4 software. Results:The incidence rate of mandibular first molars with two separate roots was 67. 6%,three roots were identified in 33. 3%of mandibular first molars. Two canals in two separate roots were found in 6. 7%of mandibular first molars,42. 4%had three canals and 18. 2%had four canals. Three canals in three roots were found in 7. 6%of mandibular first molars,25. 7%had four canals. The RE(radix ento-molaris)individual incidence of mandibular first molars was 33. 3%. There is no statistical difference (P>0.05)of incidence rate between male and female. There is statistical difference(P<0.05)of incidence rate between Mongolian and Hans. Conclusions:The root and canal morphology of mandibular first molars are diversified and variability in Inner Mongolia Region. The variability is dis-tinguished between Mongolian and Hans.