Journal of Prevention and Treatment for Stomatological Diseases ›› 2019, Vol. 27 ›› Issue (6): 387-390.doi: 10.12016/j.issn.2096-1456.2019.06.009

• Prevention and Treatment Practice • Previous Articles     Next Articles

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

MA Xiangyu1,LI Jianhua1,PENG Hongda2,MA Keyuan1,ZOU Jing3,WANG Yan3()   

  1. 1. Department of Stomatology, Mianyang Hospital of T.C.M, Mianyang 621000, China
    2. Department of Pediatric Dentistry, NanChong Stomatological Hospital, Nanchong 637100, China
    3. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases, Department of Pediatric Dentistry, West China Stomatology Hospital of Sichuan University, Chengdu 610041, China;
  • Received:2018-08-29 Revised:2018-10-26 Online:2019-06-20 Published:2019-06-21
  • Contact: Yan WANG E-mail:wangyan1458@163.com

Abstract:

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.

Key words: Cone-beam computed tomography, Deciduous teeth, Tooth root, Root canal, Number of root canals

CLC Number: 

  • R788

Figure 1

Number and distribution of root canals in first deciduous molars"

Table 1

Configuration of root canal systems in individual roots of first deciduous molars n(%)"

牙位 牙根 根管类型
Ⅰ型(1-1) Ⅱ型(2-1) Ⅳ型(2-2)
上颌第一乳
近中颊根(n=46) 46(100.00) 0(0.00) 0(0.00)
磨牙(n=46) 腭根(n=46) 46(100.00) 0(0.00) 0(0.00)
远中颊根(n=46) 46(100.00) 0(0.00) 0(0.00)
下颌第一乳 近中根(n=139) 8(5.76) 6(4.32.00) 125(89.93)
磨牙(n=139) 远中根(n=108) 13(12.04) 7(6.48.00) 88(81.48)
远中颊根(n=31) 31(100.00) 0(0.00) 0(0.00)
远中舌根(n=31) 31(100.00) 0(0.00) 0(0.00)

Table 2

Distribution of root canals in mandibular first deciduous molars n(%)"

部位 根管分布类型 小计
1211型a 1212型a 1112型b 1222型a
左侧(74牙) 7(9.46) 49(66.22) 4(5.41) 14(18.92) 74
右侧(84牙) 6(9.23) 38(58.46) 4(6.15) 17(26.15) 65
合计 13(9.35) 87(62.59) 8(5.76) 31(22.30) 139
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