Int J Stomatol ›› 2021, Vol. 48 ›› Issue (4): 426-432.doi: 10.7518/gjkq.2021063

• Original Articles • Previous Articles     Next Articles

Alveolar bone morphology of anterior teeth areas in patients with high-angle skeletal Class Ⅱ open bite

Wu Chunlan(),Tang Hua,Chen Jun()   

  1. Dept. of Orthodontics, Affiliated Stomatological Hospital, Chongqing Medical University & Chongqing Key Laboratory of Oral Diseases and Biomedical Science & Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing 401147, China
  • Received:2020-11-20 Revised:2021-04-14 Online:2021-07-01 Published:2021-06-30
  • Contact: Jun Chen;


Objective This study aimed to explore the differences in alveolar bone morphology of anterior teeth areas among patients with high-angle skeletal ClassⅡopen bite patients and high-angle skeletal ClassⅡnormal overbite by u-sing cone-beam computed tomography. Methods Fifty-eight untreated patients (29 anterior open bite patients and 29 normal overbite patients) with high-angle skeletal ClassⅡmalocclusion were selected. The vertical bone level and the width of the alveolar bone were measured in the midsagittal plane of the teeth by Dolphin software. The differences in alveolar bone morphology were compared between the two groups, and the correlation between the alveolar bone morphology and overbite was explored. Results Differences in alveolar bone morphology between patients with open bite and those with normal overbite were identified, and such differences primarily affected the lingual/palatal sides of the vertical bone level and the width of the alveolar bone. The vertical bone level on the lingual/palatal sides of most incisors in the open bite group was statistically lower than those in the control group, and the width of the alveolar bone on the lingual/palatal sides and the apical level was statistically thin. In the correlation analysis, a different degree of positive correlation was observed between the overbite and alveolar bone thickness at different sites of different teeth, whereas overbite was negatively related to the vertical bone level of maxillary incisors and mandibular central incisors. Conclusion The vertical bone level and thickness of the alveolar bone on the lingual/palatal sides were significantly low and thin in the high-angle skeletal ClassⅡopen bite patients, and caution should be taken in the treatment of these patients, particularly the torque of incisors and the backward movement of anterior teeth, to avoid root resorption, alveolar bone dehiscence, and fenestration in the upper and lower incisors.

Key words: anterior open bite, incisor, alveolar bone morphology, cone beam computed tomography

CLC Number: 

  • R783.5


Fig 1

Three-dimensional location of root length"

Fig 2

Diagram of the width of alveolar bone measurement"

Fig 3

Diagram of the vertical bone level of alveolar bone measurement"

Tab 1

Comparison of vertical bone level of maxillary and mandibular incisors between open bite group and control group"

牙位 唇侧牙槽骨附着高度 舌/腭侧牙槽骨附着高度
开牙合组/mm 对照组/mm P 开牙合组/mm 对照组/mm P
上颌侧切牙 1.55(1.00~2.17) 1.45(1.02~1.90) 0.588 1.45(0.90~3.97) 0.80(0.70~0.97) 0.000**
上颌中切牙 1.10(1.00~1.50) 1.40(1.00~1.90) 0.269 1.00(0.87~1.42) 0.90(0.80~1.00) 0.044*
下颌侧切牙 1.30(0.90~1.90) 1.30(1.00~1.90) 0.476 1.50(1.00~2.70) 1.50(1.10~2.00) 0.977
下颌中切牙 1.50(1.10~2.00) 1.55(1.00~1.92) 0.497 2.00(1.60~4.00) 1.90(1.45~2.10) 0.028*

Tab 2

Comparison of width of alveolar bone of maxillary incisors between open bite group and control group"

位置 上颌中切牙 上颌侧切牙
开牙合组/mm 对照组/mm P 开牙合组/mm 对照组/mm P
唇侧2 mm 0.70(0.47~1.00) 0.80(0.30~1.15) 0.530 0.60(0.23~0.98) 0.75(0.23~1.08) 0.795
唇侧4 mm 0.90(0.60~1.10) 1.20(0.95~1.50) 0.000** 0.70±0.40 0.75±0.49 0.676
唇侧6 mm 0.80(0.40~1.02) 1.10(0.65~1.20) 0.022* 0.30(0.20~0.57) 0.20(0.10~0.60) 0.046*
唇侧根尖 1.90(1.70~2.10) 2.10(1.70~2.45) 0.195 1.76±0.86 1.63±0.76 0.517
腭侧2 mm 0.80(0.50~1.10) 1.40(1.05~1.60) 0.000** 0.40(0.00~0.80) 1.15(0.90~1.40) 0.000**
腭侧4 mm 1.45(1.20~1.90) 2.10(1.70~2.40) 0.000** 1.10(0.15~1.30) 1.75(1.40~2.20) 0.000**
腭侧6 mm 2.10(1.70~2.50) 2.90(2.40~3.75) 0.000** 1.50(1.20~1.70) 2.40(2.00~3.17) 0.000**
腭侧根尖 5.95±1.45 7.84±1.53 0.000** 4.82±1.10 6.78±2.05 0.000**
总根尖(腭侧+唇侧) 7.89±1.07 9.90±1.46 0.000** 6.52±1.58 8.41±1.82 0.000**

Tab 3

Comparison of width of alveolar bone of mandibular incisors between open bite group and control group"

位置 下颌中切牙 下颌侧切牙
开牙合组/mm 对照组/mm P 开牙合组/mm 对照组/mm P
唇侧2 mm 0.35(0.10~0.50) 0.50(0.20~1.10) 0.102 0.30(0.20~0.50) 0.40(0.20~1.00) 0.329
唇侧4 mm 0.30(0.20~0.40) 0.40(0.20~0.75) 0.017* 0.20(0.20~0.40) 0.40(0.20~0.80) 0.019*
唇侧6 mm 0.40(0.20~0.50) 0.35(0.20~0.52) 0.897 0.30(0.20~0.40) 0.20(0.20~0.30) 0.477
唇侧根尖 3.01±0.93 3.32±1.10 0.182 3.40(2.60~4.20) 3.30(2.55~3.65) 0.624
舌侧2mm 0.00(0.00~0.30) 0.15(0.00~0.42) 0.209 0.40(0.00~0.60) 0.40(0.00~0.70) 0.503
舌侧4mm 0.40(0.10~0.90) 1.00(0.70~1.40) 0.000** 0.90(0.40~1.20) 1.40(1.10~1.75) 0.000**
舌侧6mm 0.92±0.55 1.27±0.52 0.005** 1.31±0.49 1.65±0.50 0.006**
舌侧根尖 3.69±0.79 3.77±0.79 0.634 4.00(3.40~4.50) 4.20(3.65~4.75) 0.259
总根尖(舌侧+唇侧) 6.53±0.77 7.10±0.23 0.107 6.80(5.32~8.20) 7.60(7.05~8.10) 0.175

Tab 4

Pearson correlation coefficients between the overbite and width of alveolar bone"

位置 上颌侧
唇侧2 mm 0.069 0.027 0.166 0.198
唇侧4 mm -0.028 0.433** 0.283* 0.283*
唇侧6 mm -0.168 0.245* -0.002 -0.033
唇侧根尖 0.057 0.038 0.005 0.183
舌/腭侧2 mm 0.497** 0.431** 0.012 0.114
舌/腭侧4 mm 0.472** 0.434** 0.366** 0.402**
舌/腭侧6 mm 0.395** 0.466** 0.180 0.209
舌/腭侧根尖 0.351** 0.532** -0.019 -0.037
总根尖(唇侧+舌/腭侧) 0.340** 0.557** 0.189 0.156
唇侧牙槽骨高度 -0.223 -0.026 0.030 -0.222
舌/腭侧牙槽骨高度 -0.449** -0.227 -0.034 -0.319**
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