Int J Stomatol

Int J Stomatol ›› 2019, Vol. 46 ›› Issue (6): 640-649.doi: 10.7518/gjkq.2019105

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Cone beam computed tomography study on root and root canal morphology of mandibular second permanent molars in Guangfu population in Lingnan area

Li Qi1,2,Huang Shaohong1()   

  1. 1. Special Dental Center, Stomatological Hospital of Southern Medical University, Guangzhou 510280, China
    2. Dept. of Stomatology, Zhaoqing Medical College, Zhaoqing 526020, China
  • Received:2019-03-22 Revised:2019-06-04 Online:2019-11-01 Published:2019-11-14
  • Contact: Shaohong Huang E-mail:hsh.china@tom.com
  • Supported by:
    This study was supported by Natural Science Innovation Project of Guangdong Education Department(2017KTSCX03-6);Construction Funds for High Level Universities of Guangdong Provincial Department of Education—Clinical Research Project of Southern Medical University(LC2017PY001)

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Abstract: Objective To research the root and root canal morphology of mandibular second permanent molars in Guangfu population of Lingnan area.Methods A total of 1 279 mandibular second permanent molars were collected from the 815 cone beam computed tomography (CBCT) images of Guangfu population. The root and root canal morphology were observed and counted. The results are compared and analyzed with similar studies at home and abroad in recent years. Results The double roots type, C-shaped root type, conical fusion root type, and three roots type of mandibular second permanent molar accounted for 57.16%, 32.84%, 9.77% and 0.23%, respectively. The detection rate of double roots type in males was higher than that in females (P<0.05), but that of C-shaped root type was on the contrary. There were significant differences in the detection rate of double roots type among different age groups in women, and so was that of C-shaped root type (P<0.01). The root canal morphology in mesial root of the double roots type was 38.58% in type Ⅳ (2-2), 28.73% in type Ⅱ (2-1) and 22.98% in type Ⅰ (1-1), and the detection rate of type Ⅰ (1-1) root canals in females was significantly higher than that in males (P<0.01), but that of typeⅣ (2-2) root canals was the opposite. Type Ⅰ (1-1) root canals were the main type of distal root, accounting for 81.67%, and the difference among the root canal morphology detection rate of distal and mesial roots had statistical significance (P<0.01). The detection rate of C-shaped root canals in females was higher than that in males (P<0.05), and the detection rates of various root canal morphology in different parts of root canal had statistical significance (P<0.01). Among conical fusion root types, C-shaped root canal type was 62.40%, multiple root canal type was 20.00%, single root canal type was 17.60%, and the detection rate of multiple root canal type in males was significantly higher than that in females (P<0.01). The morphological symmetry of bilateral root was 68.10%, and that of bilateral root and root canal was 62.93%. Conclusion The root and root canal morphology of mandibular second permanent molars in Guangfu population of Lingnan region is complex and diverse, which is different from other regions and races at home and abroad.

Key words: mandibular second permanent molar, tooth root, root canal, cone beam computed tomography, Guangfu population

CLC Number: 

  • R322.4 +1

TrendMD: 

Fig 1

Root morphology of mandibular second permanent molars"

Tab 1

Root morphology of 1 279 mandibular second permanent molars n"

牙根形态 总计 性别 男性组 女性组
男 女 18~35岁 36~55岁 ≥56岁 18~35岁 36~55岁 ≥56岁
双根型 731 365 366 144 120 101 112 110 144
C形根型 420 179 241 80 56 43 101 82 58
锥形融合根型 125 53 72 13 25 15 30 23 19
三根型 3 3 0 0 2 1 0 0 0
合计 1 279 600 679 237 203 160 243 215 221

Tab 2

Root canal morphology in mesial root of double roots type of mandibular second permanent molars"

根管形态 总计 性别 男性组 女性组
男 女 18~35岁 36~55岁 ≥56岁 18~35岁 36~55岁 ≥56岁
Ⅰ型（1-1） 168 66 102 23 25 18 36 32 34
Ⅱ型（2-1） 210 108 102 49 33 26 29 38 35
Ⅲ型（1-2-1） 32 32 16 7 3 6 6 1 9
Ⅳ型（2-2） 282 159 123 59 54 46 35 33 55
Ⅴ型（1-2） 28 9 19 2 2 5 5 3 11
Ⅵ型（2-1-2） 3 3 0 1 2 0 0 0 0
Ⅶ型（1-2-1-2） 8 4 4 3 1 0 1 3 0
Ⅷ型（3-3） 0 0 0 0 0 0 0 0 0
合计 731 365 366 144 120 101 112 110 144

Tab 3

Root morphology of double roots type of mandibular second permanent molars"

牙根 Ⅰ型（1-1） Ⅱ型（2-1） Ⅲ型（1-2-1） Ⅳ型（2-2） Ⅴ型（1-2） Ⅵ型（2-1-2） Ⅶ型（1-2-1-2） Ⅷ型（3-3） 合计
近中根 168 210 32 282 28 3 8 0 731
远中根 597 17 31 43 43 0 0 0 731

Fig 2

Root canal morphology of C-shaped root of mandibular second permanent molar"

Tab 4

Root canal morphology of 420 C-shaped root of mandibular second permanent molars n"

根管部位 C1型 C2型 C3型 C4型 C5型 合计
根管口 181 165 74 0 0 420
根中部 78 172 159 11 0 420
根尖部 15 68 274 61 2 420
合计 274 405 507 72 2 -

Fig 3

Root canal morphology of conical fusion root type of mandibular second permanent molars"

Tab 5

Root canal morphology of conical fused root type of mandibular second permanent molars"

根管形态 总计 性别 男性组 女性组
男 女 18~35岁 36~55岁 ≥56岁 18~35岁 36~55岁 ≥56岁
C形根管型 78 26 52 5 13 8 23 18 11
多根管型 25 18 7 5 8 5 2 2 3
单根管型 22 9 13 3 4 2 5 3 5
合计 125 53 72 13 25 15 30 23 19

Tab 6

Root morphology of multiple root canals type of 25 conical fused root type of mandibular second permanent molars"

根管 Ⅰ型（1-1） Ⅱ型（2-1） Ⅲ型（1-2-1） Ⅳ型（2-2） Ⅴ型（1-2） Ⅵ型（2-1-2） Ⅶ型 （1-2-1-2） Ⅷ型（3-3） 合计
近中方向根管 10 5 1 8 1 0 0 0 25
远中方向根管 19 2 0 2 2 0 0 0 25

Fig 4

Symmetry analysis of root and root canal morphology of mandibular second permanent molars"

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