采用锥形束CT测量健康上前牙唇侧骨板形态及牙长轴倾角的变化

doi:10.7518/hxkq.2019.04.014

华西口腔医学杂志 ›› 2019, Vol. 37 ›› Issue (4): 412-416.doi: 10.7518/hxkq.2019.04.014

采用锥形束CT测量健康上前牙唇侧骨板形态及牙长轴倾角的变化

韩扬¹(),李晓光¹,朱洁¹,李菁雯¹,胡苏宁¹,李聪¹,赵晶¹,梁宇红^1,²

1.北京大学国际医院口腔科,北京 102206
2.北京大学口腔医学院·口腔医院牙体牙髓科,口腔疾病国家临床研究中心, 口腔数字化医疗技术和材料国家工程实验室,口腔数字医学北京市重点实验室,北京 100081

收稿日期:2018-10-30 修回日期:2019-03-29 出版日期:2019-08-01 发布日期:2019-08-23
通讯作者: 韩扬 E-mail:dr_hanyang@sina.com
作者简介:韩扬,主治医师,博士,E-mail：dr_hanyang@sina.com

Cone-beam computed tomography digital for measuring the inclination angle to the long axis of healthy maxillary anterior teeth and morphologically characterizing their labial bone plates

Yang Han¹(),Xiaoguang Li¹,Jie Zhu¹,Jingwen Li¹,Suning Hu¹,Cong Li¹,Jing Zhao¹,Yuhong Liang^1,²

1.Dept. of Stomatology, Peking University International Hospital, Beijing 102206, China
2.Dept. of Cariology and Endodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China

Received:2018-10-30 Revised:2019-03-29 Online:2019-08-01 Published:2019-08-23
Contact: Yang Han E-mail:dr_hanyang@sina.com

摘要/Abstract

摘要：

目的采用锥形束CT（CBCT）图像数字化测量的方法,测量健康上前牙唇侧骨板厚度、釉牙骨质界（CEJ）到骨嵴顶距离及牙长轴倾角,并探讨可能的影响因素。方法分析由Newtom VGI ^? CBCT机拍摄获得的345例CBCT影像,使用NNT软件分别在上颌中切牙、侧切牙和尖牙的正中矢状平面上测量CEJ下4 mm、根中点和根尖水平的唇侧骨板厚度,CEJ距骨嵴顶距离和牙长轴倾角,记录各牙位CEJ下4 mm水平唇侧骨板厚度≥1 mm的例数。结果 1）中切牙的牙长轴倾角,CEJ距骨嵴顶距离,CEJ下4 mm、根中点和根尖水平的骨板厚度均值分别为15.2°±6.2°、（1.5±1.0）mm、（0.8±0.4）mm、（0.6±0.4）mm和（1.3±0.7）mm;侧切牙和尖牙的上述5项测量值分别为16.2°±8.8°、（1.6±1.0）mm、（0.7±0.5）mm、（0.4±0.6）mm和（1.1±0.7）mm;19.0°±6.2°、（1.8±1.0）mm、（0.9±0.6）mm、（0.4±0.6）mm和（1.2±0.7）mm。2）345例患者中,中切牙、侧切牙和尖牙CEJ下4 mm水平骨板厚度≥1 mm者分别占28.3%、25.8%和42.7%。3）中切牙、侧切牙和尖牙CEJ到骨嵴顶距离与年龄高度相关,相关系数分别为0.42、0.50、0.62（P<0.01）。结论健康上前牙唇侧骨板厚度较薄,CEJ到骨嵴顶距离随着年龄的增加而增加,牙长轴较牙槽突长轴舌倾,充分考虑这些特点有利于提高相关口腔治疗方案的安全性和预后。

关键词: 唇侧骨板, 牙长轴, 锥形束CT, 数字化测量

Abstract:

Objective We aim to determine the thickness of the labial plate, the distance between the cement-enamel junction (CEJ) and alveolar crest, and the inclination angle of the long axis of healthy maxillary anterior teeth by using cone- beam computed tomography (CBCT). Methods A total of 345 CBCT volumes obtained by Newtom VGI ^? CBCT were analyzed by using the NNT software. The digital measurements of the labial bone plate thickness at level 4 mm below the CEJ, the midpoint of tooth root and the radiological tooth apex, the distance between the CEJ and alveolar crest, and the angle between the long axis of the teeth and the long axis of alveolar process were obtained from the mid-sagittal planes of maxillary incisors and canines. Plate thickness 4 mm below the CEJ was measured, and values below ≥1 mm were recorded. Results In the central incisor, 1) the angle between the long axis of the teeth and alveolar bone was 15.2°±6.2°, the distance between the CEJ and alveolar crest was (1.5±1.0) mm, labial bone plate thickness at 4 mm below the CEJ was (0.8±0.4) mm, the midpoint of tooth root was (0.6±0.4) mm, and the radiological tooth apex was (1.3±0.7) mm; in the lateral incisor, 16.2°±8.8°, (1.6±1.0) mm, (0.7±0.5) mm, (0.4±0.6) mm, and (1.1±0.7) mm, respectively; and in the canine, 19.0°±6.2°, (1.8±1.0) mm, (0.9±0.6) mm, (0.4±0.6) mm, and (1.2±0.7) mm, respectively. 2) The frequencies of plate thickness ≥1 mm were 28.3%, 25.8%, and 42.7% in the central incisor, lateral incisor, and canine, respectively. 3) The distance between the CEJ and alveolar crest was positively correlated with age. The correlation coefficients was 0.42 (P<0.01) in the central incisor, 0.50 (P<0.01) in the lateral incisor, and 0.62 (P<0.01) in the canine. Conclusion The thickness of labial bone plate is thin, the distance from CEJ to alveolar crest increases with age, and the long axis of the teeth is more inclined than the long axis of alveolar process. Knowledge of these special morphological characteristics can improve the safety and result for many dental procedures.

Key words: labial bone plate, long axis of tooth, cone-beam computed tomography, digital measurement

中图分类号:

韩扬,李晓光,朱洁,李菁雯,胡苏宁,李聪,赵晶,梁宇红. 采用锥形束CT测量健康上前牙唇侧骨板形态及牙长轴倾角的变化[J]. 华西口腔医学杂志, 2019, 37(4): 412-416.

Yang Han,Xiaoguang Li,Jie Zhu,Jingwen Li,Suning Hu,Cong Li,Jing Zhao,Yuhong Liang. Cone-beam computed tomography digital for measuring the inclination angle to the long axis of healthy maxillary anterior teeth and morphologically characterizing their labial bone plates[J]. West China Journal of Stomatology, 2019, 37(4): 412-416.

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参考文献 18

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测量项目	中切牙（n=660）	侧切牙（n=667）	尖牙（n=668）
∠AOB/°	15.2±6.2	16.2±8.8	19.0±6.2
l₁/mm	0.8±0.4	0.7±0.5	0.9±0.6
l₂/mm	0.6±0.4	0.4±0.6	0.4±0.6
l₃/mm	1.3±0.7	1.1±0.7	1.2±0.7

牙位	组别			合计	P值
牙位	青年组	中年组	老年组	合计	P值
中切牙	1.1±0.9	1.6±0.7	2.6±0.8	1.5±1.0	0.00
侧切牙	1.3±0.9	1.8±0.8	2.7±0.6	1.6±1.0	0.00
尖牙	1.4±1.0	1.9±0.9	2.8±0.9	1.8±1.0	0.00

采用锥形束CT测量健康上前牙唇侧骨板形态及牙长轴倾角的变化

Cone-beam computed tomography digital for measuring the inclination angle to the long axis of healthy maxillary anterior teeth and morphologically characterizing their labial bone plates

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