锥形束CT应用于第一乳磨牙根管形态的研究

Study on the application of cone-beam CT in root canal morphology of first deciduous molars

目的通过对锥形束CT(cone beam computed tomography,CBCT)影像资料的回顾性研究,分析儿童第一乳磨牙的根管的数目、分布特点。方法选取绵阳市中医医院口腔科91名4~8岁儿童共185颗第一乳磨牙,分析其牙根数目、根管的数目、分布。结果 46颗上颌第一乳磨牙均为3个牙根;139颗下颌第一乳磨牙有2个牙根(77.70%)和3个牙根(22.30%)2种类型。所有上颌第一乳磨牙的根管均为Ⅰ型,而下颌第一乳磨牙最主要的根管类型则是Ⅳ型。双侧下颌第一乳磨牙均被纳入研究的51名儿童中,有48名(94.12%)的牙根和根管分布表现为左右对称。结论第一乳磨牙多表现为2~3个牙根,根管以Ⅰ型和Ⅳ型为主,根管分布多为左右对称。

Objective To analyze the number, distribution of root canals in children’s first deciduous teeth through a retrospective study of cone-beam computed tomography(CBCT). Methods A total of 185 first deciduous molars were selected from 91 children aged 4 to 8 years old in the Stomatology Department of Mianyang Hospital of Traditional Chinese Medicine. The number, distribution of root canals were analyzed. Results All 46 maxillary first deciduous molars had three roots;139 mandibular first deciduous molars had two roots(77.70%) and three roots(22.30%). The root canals of all maxillary first deciduous molars are type Ⅰ, while the main root canal type of mandibular first deciduous molars is type Ⅳ. Of 51 children with bilateral mandibular first deciduous molars, 48(94.12%) had symmetrical root and canal distributions. Conclusion The first deciduous molars usually have 2 to 3 roots. Root canals are mainly type I and IV. The distribution of root canals is symmetrical.