Journal of Prevention and Treatment for Stomatological Diseases ›› 2018, Vol. 26 ›› Issue (3): 175-179.doi: 10.12016/j.issn.2096-1456.2018.03.007

• Cinical Study • Previous Articles     Next Articles

Cone-beam computed tomography evaluation of the distance between the root apex of mandibular molars and the inferior alveolar nerve canal in adults

Juan ZHANG(), Yaxin WANG, Chao SUN, Guangchao ZHOU, Lianfeng YANG(), Daming WU()   

  1. Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University;Department of Radiology, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing 210029, China
  • Received:2017-08-22 Revised:2017-09-26 Online:2018-03-20 Published:2018-08-31

Abstract:

Objective To evaluate the spatiotemporal relationship between the root apex of mandibular molars and the inferior alveolar nerve canal (IANC) in adults. Methods Cone-beam computed tomography (CBCT) images were collected in 236 patients, and the distances from the root apexes of mandibular molars to the IANC were measured in NNT 4.6 software. The relationship between distance and gender was evaluated. Results In two-rooted mandibular first molars, the distances from the mesial root and distal root to the IANC were 7.34 ± 2.07 mm and 6.69 ± 2.08 mm, respectively, in males and 6.47 ± 2.22 mm and 5.94 ± 2.11 mm in females. In three-rooted mandibular first molars, the distances from the mesial root, distobuccal root, and distolingual to the IANC were 7.29 ± 1.30 mm, 7.40 ± 2.33 mm, and 9.97 ± 2.19 mm, respectively, in males and 6.08 ± 2.57 mm, 6.35 ± 2.40 mm, and 9.01 ± 2.90 mm, respectively, in females. In one-rooted mandibular second molars, the distance from the root to the IANC was 4.09 ± 1.64 mm in males and 3.89 ± 1.76 mm in females. In two-rooted mandibular second molars, the distances from the mesial root and distal root to the IANC were 5.14 ± 2.08 mm and 4.39 ± 1.85 mm, respectively, in males and 3.78 ± 1.69 mm and 3.24 ± 1.72 mm, respectively, in females. There were no significant with in-gender differences between the left and right side in the distances from the root apexes to the IANC (P>0.05). The distances from the mandibular first molar were greater in males than in females. The longest average distance was from the distolingual root apexes of three-rooted mandibular first molars to the IANC, and the distances were longer from the distobuccal root apexes of three-rooted mandibular first molars to the IANC than from the distal root apexes of two-rooted mandibular first molars to the IANC (P<0.05). There was no within-gender difference in the distances from the root apexes of single-rooted mandibular second molars to the IANC (P>0.05), but the distances in two-rooted mandibular second molars were larger in males than in females (P<0.05). The distances from the root apexes to the IANC were smaller in mandibular second molars than in mandibular first molars (P<0.05). Conclusion There are significant differences between adult males and females in the distance from the root apex to the IANC for mandibular first molars and two-rooted mandibular second molars. The distances from the root apexes to the IANC were smaller in mandibular second molars than in mandibular first molars.

Key words: CBCT, Inferior alveolar nervecanal, Mandibular first molar, Mandibular second molar, Root apex

CLC Number: 

  • R781.05

Figure 1

Measurement of distances from mandibular first molar root apexes to the IANC"

"

组别 男性 女性 总计
右侧 左侧 右侧 左侧
两根下颌第一磨牙 85 88 101 106 380
三根下颌第一磨牙 18 12 21 11 62
两根下颌第二磨牙 65 64 71 69 269
单根下颌第二磨牙 40 32 51 48 171

Table 2

The distances from the root apexs of mandibular first molars to the IANC x ± s,mm"

组别 男性 女性
右侧 左侧 合计 t1 右侧 左侧 合计 t2 t3
两根下颌第一磨牙 M 7.35 ± 2.18 a 7.33 ± 1.97 a 7.34 ± 2.07 a 0.056 6.48 ± 2.27 b 6.46 ± 2.19 b 6.47 ± 2.22 b 0.077 3.916
D 6.74 ± 2.19 a 6.64 ± 1.97 a 6.69 ± 2.08 a 0.298 5.96 ± 2.14 b 5.92 ± 2.08 b 5.94 ± 2.11 b 0.138 3.483
三根下颌第一磨牙 M 7.27 ± 1.50 a 7.31 ± 1.00 a 7.29 ± 1.30 a -0.09 6.09 ± 2.09 b 6.04 ± 3.41 b 6.08 ± 2.57 b 0.046 2.327
DB 7.41 ± 2.73 a 7.40 ± 1.69 a 7.40 ± 2.33 a 0.06 6.34 ± 1.90 b 6.36 ± 3.27 b 6.35 ± 2.40 b -0.023 1.748
DL 9.99 ± 2.43 a 9.96 ± 1.89 a 9.97 ± 2.19 a 0.37 9.00 ± 2.42 a 9.03 ± 3.79 a 9.01 ± 2.90 a -0.025 1.473
t4 -0.147 -0.03 -0.135 -0.733 -0.566 -0.922
t5 0.987 1.162 1.533 0.258 0.181 0.333
t6 0.091 0.11 0.145 -0.268 -0.134 -0.288
t7 1.126 1.268 1.709 0.762 0.637 1.011
t8 4.569 4.334 6.374 4.559 3.419 5.745
t9 5.614 5.494 7.941 5.79 4.302 7.264

Table 3

The distances from the root apexs of mandibular second molars to the IANC x ± s,mm"

组别 男性 女性
右侧 左侧 合计 t1 右侧 左侧 合计 t2 t3
单根下颌第二磨牙 4.11 ± 1.60 a 4.06 ± 1.72 a 4.09 ± 1.64 a 0.137 3.87 ± 1.74 a 3.91 ± 1.79 a 3.89 ± 1.76 a -0.112 0.741
两根下颌第二磨牙 M 5.15 ± 2.12 a 5.13 ± 2.05 a 5.14 ± 2.08 a 0.066 3.76 ± 1.74 b 3.80 ± 1.64 b 3.78 ± 1.69 b -0.122 5.919
D 4.45 ± 1.86 a 4.33 ± 1.85 a 4.39 ± 1.85 a 0.4 3.29 ± 1.80 b 3.20 ± 1.65 b 3.24 ± 1.72 b 0.314 5.278
t4 2.671 2.542 3.704 -0.344 -0.358 -0.497
t5 0.973 0.688 1.165 -1.79 -2.227 -2.842

Table 4

Comparison of the distances from root apexs to the IANC between mandibular first molars and mandibular second molars x ± s,mm"

组别 男性 女性
两根下颌第一磨牙 M 7.34 ± 2.07a 6.47 ± 2.22a
D 6.69 ± 2.08b 5.94 ± 2.11b
三根下颌第一磨牙 M 7.29 ± 1.30a 6.08 ± 2.57a
DB 7.40 ± 2.33a 6.35 ± 2.40a
DL 9.97 ± 2.19c 9.01 ± 2.90c
单根下颌第二磨牙 4.09 ± 1.64d 3.89 ± 1.76d
两根下颌第二磨牙 M 5.14 ± 2.08e 3.78 ± 1.69d
D 4.39 ± 1.85d 3.24 ± 1.72e
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