Journal of Prevention and Treatment for Stomatological Diseases ›› 2020, Vol. 28 ›› Issue (6): 372-376.doi: 10.12016/j.issn.2096-1456.2020.06.006

• Cinical Study • Previous Articles     Next Articles

Analysis of crown-root morphology in canines based on cone-beam computed tomography

AI Yilong,WU Siyuan,ZOU Chen()   

  1. Department of Orthodontics, Foshan Stomatology Hospital, School of Stomatology and Medicine, Foshan University, Guangdong Engineering Research Center of Digital Stomatology, Foshan Engineering Research Center of Stomatology, Foshan 528000, China
  • Received:2019-04-15 Revised:2019-11-09 Online:2020-06-20 Published:2020-05-28
  • Contact: Chen ZOU E-mail:zouchen2005@gmail.com

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Abstract:

Objective To compare the morphology of the crown roots of upper and lower canines in patients with skeletal Class Ⅰ, Ⅱ, and Ⅲ malocclusions by CBCT and to provide guidance for the clinical treatment of orthodontics. Methods Randomly selected patients with permanent occlusal malocclusion who had undergone CBCT and X-ray skull lateral radiographs were Classified according to the ANB angle size: group Ⅰ, group Ⅱ, and group Ⅲ. Three-dimensional reconstruction was used to obtain the median sagittal section images of the right upper and lower canines. The crown root angle, crown root deflection distance, and lip tangent angle at the center of the clinical crown were used as indicators for measurement and analysis with the use of AutoCAD software. Results The difference in the crown-root skew distance between different sagittal face types, including upper canines (F=3.335, P=0.042), lower canines (F=3.745, P=0.029) crown root angles and upper canines (F=3.312, P=0.043), and lower canines (F=3.641, P= 0.032), was statistically significant (P < 0.05). The crown root angle of the maxillary canine in group Ⅰ was larger than that in group Ⅱ, and the deflection distance of the crown root was negative and the absolute value was lager in group Ⅰ than in group Ⅱ (P < 0.05). The deflection distance was positive and greater in group Ⅲ than in groups Ⅰ and Ⅱ (P < 0.05). There was no significant difference in the maxillary canine crown-labial tangent angle between the different sagittal facial misalignment groups (P > 0.05). Conclusion Differences in the morphology of canines were found among subjects with skeletal Class Ⅰ, Ⅱ, and Ⅲ malocclusions. The root of the upper canine in Class Ⅰ malocclusions was relatively closer to the labial side of the crown than that in Class Ⅱ malocclusions. The root of the lower canine in Class Ⅲ malocclusions was the closest to the lingual side of the crown among the three Classes.

Key words: sagittal skeletal pattern, canine, crown morphology, crown-root angle, labial tangent angle, CBCT, malocclusion, orthodontics, torque angle

CLC Number: 

  • R783.5

Figure 1

Marked points, lines and measurement items of the crown root and crown lip shape measurements a: landmarks and measurements of crown-root morphology. A: root apex; B: the middle point of the labial and lingual CEJs; C: incision superius; CD: the vertical distance from the incisor edge or cusp of the tooth to the extension line of the long-axis root; CEJ: cement-enamel junction. b: landmarks and measurements of labial crown morphology. A: root apex; B: the middle point of the labial and lingual CEJs; C: incision superius; CEJ: cement-enamel junction; H: the point obtained by dissecting the crown height minus 1.8 mm; GM: gingival margin; FA: center of the clinical crown"

Table 1

Comparison of the crown-root angle among the 3 groups °,x ± s"

Tooth ClassⅠ group ClassⅡ group Class Ⅲ group F P
upper canine 184.00 ± 3.48 181.32 ± 3.61 183.28 ± 3.43 3.335 0.042
lower canine 177.64 ± 2.45 177.19 ± 3.68 175.29 ± 3.00 3.745 0.029

Table 2

Comparison of the crown-root deviation distance among the 3 groups mm,x ± s"

Tooth ClassⅠ group ClassⅡ group Class Ⅲ group F P
upper canine -0.73 ± 0.61 -0.27 ± 0.62 -0.57 ± 0.62 3.312 0.043
lower canine 0.44 ± 0.41 0.48 ± 0.64 0.83 ± 0.55 3.641 0.032

Table 3

Comparison of the labial surface angle among the 3 groups °,x ± s"

Tooth ClassⅠ group ClassⅡ group Class Ⅲ group F P
upper canine 23.28 ± 0.84 23.32 ± 1.79 24.43 ± 3.05 - 0.379
lower canine 18.17 ± 2.25 18.31 ± 1.73 17.95 ± 1.73 0.183 0.833
[1] Andrews LF . Straight wire: the concept and appliance[M]. San Diego: LA Wells Company, 1989: 159-170.
[2] 邹晨, 陈奕嘉, 吴志辉 , 等. 不同矢状骨面型错牙合中切牙冠根角的锥形束CT分析[J]. 中华口腔医学研究杂志(电子版), 2013,7(2):140-144.
Zou C, Chen YJ, Wu ZH , et al. Crown-root angle of the central incisors in skeletal ClassⅠ, Ⅱ, and Ⅲ malocclusions assessed with cone-beam computed tomography[J]. Chin J Stomatol Res (Electronic Edition), 2013,7(2):140-144.
[3] Feres MFN, Rozolen BS, Alhadlaq A , et al. Comparative tomographic study of the maxillary central incisor collum angle between Class I, Class II, division 1 and 2 patients[J]. J OrthodSci, 2018,7(1):6-22.
[4] 王小明, 王晶, 邹敏 , 等. 不同骨性错牙合类型成年患者中切牙冠根形态的锥形束CT分析[J]. 中华口腔医学杂志, 2019,54(2):101-106.
Wang XM, Wang J, Zou M , et al. Analysis of the discrepancy of crown-root morphology of central incisors among different skeletal malocclusion using cone-beam CT[J]. Chin J Stomatol, 2019,54(2):101-106.
[5] 刘爱青, 张继东, 缪羽 , 等. 安氏Ⅱ类2分类错牙合患者上颌前牙区唇侧牙槽骨厚度研究[J]. 口腔疾病防治, 2016,24(11):651-655.
Liu AQ, Zhang JD, Miao Y , et al. Measurement of labial alveolar bone thickness of Angle ClassⅡDivision 2 patients in maxillary anterior region with cone-beam CT[J]. J Prev Treat Stomatol Dis, 2016,24(11):651-655.
[6] Kong WD, Ke JY, Hu XQ , et al. Applications of cone-beam computed tomography to assess the effects of labial crown morphologies and collum angles on torque for maxillary anterior teeth[J]. Am J Orthod Dentofacial Orthop, 2016,150(5):789-795.
doi: 10.1016/j.ajodo.2016.03.029
[7] 王小明, 王晶, 张博 , 等. 不同安氏错牙合畸形中切牙Collum角差异性锥形束CT分析[J]. 中国实用口腔科杂志. 2018,11(2):117-121.
Wang XM, Wang J, Zhang B , et al. Analysis of different collum angles among different types of Angle malocclusion using CBCT[J]. Chin J Pract Stomatol, 2018,11(2):117-121.
[8] Israr J, Bhutta N, Chatha MR . Comparison of collum angle of maxillary central incisors in Class Ⅱ division 1 & 2 malocclusions[J]. Pak Oral Dent J, 2016,36(1):91-94.
[9] 黎敏, 王斯维, 赵一姣 , 等. 安氏Ⅱ类2分类错牙合上前牙冠根形态的锥形束CT分析[J]. 北京大学学报(医学版), 2016,48(1):105-110.
doi: 10.3969/j.issn.1671-167X.2016.01.019
Li M, Wang S, Zhao YJ , et al. A cone-beam computed tomography study on crown-root morphology of maxillary anterior teeth in Class Ⅱ, division 2 malocclusion[J]. Beijing Da Xue Xue Bao Yi Xue Bao, 2016,48(1):105-110.
doi: 10.3969/j.issn.1671-167X.2016.01.019
[10] Yagci A, Veli I, Uysal T , et al. Dehiscence and fenestration in skeletal Class Ⅰ, Ⅱ, and Ⅲ malocclusions assessed with cone-beam computed tomography[J]. Angle Orthod, 2012,82(1):67-74.
doi: 10.2319/040811-250.1
[11] Kyoung-Won K, Sung-Jin K, Ji-Yeon L , et al. Apical root displacement is a critical risk factor for apical root resorption after orthodontic treatment[J]. Angle Orthod, 2018,88(6):740-747.
doi: 10.2319/111417-777.1
[12] Sun B, Tang J, Xiao P , et al. Presurgical orthodontic decompensation alters alveolar bone condition around mandibular incisors in adults with skeletal class Ⅲ malocclusion[J]. Int J Clin Exp Med, 2015,8(8):12866-12873.
[13] Sendyk M, de Paiva JB, Abrao J , et al. Correlation between buccolingual tooth inclination and alveolar bonethickness in subjects with Class Ⅲ dentofacial deformities[J]. Am J Orthod Dentofacial Orthop, 2017,152(1):66-79.
doi: 10.1016/j.ajodo.2016.12.014
[14] Kato M, Namura Y, Yoneyama T , et al. Effect of the vertical position of the canine on the frictional/orthodontic force ratio of Ni-Ti archwires during the levelling phase of orthodontic treatment[J]. J Oral Sci, 2018,60(3):336-343.
doi: 10.2334/josnusd.17-0356
[15] Papageorgiou SN, Sifakakis I, Keilig L , et al. Torque differences according to tooth morphology and bracket placement: a finite element study[J]. Eur J Orthod, 2017,39(4):411-418.
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