青少年正畸患者下颌第三磨牙萌出的影响因素研究

doi:10.13591/j.cnki.kqyx.2023.08.005

Abstract

Abstract:

Objective To delineate and analyze the factors affecting the eruption of mandibular third molars in adolescent orthodontic patients. Methods Adolescent orthodontic patients with impacted mandibular third molars at their first visit were retrospectively screened.The record of gender, Angle Classification, development of mandibular third molar, tooth extraction, the angle of mandibular third molar inclination(8-SN), the angle between mandibular second and third molars(7-8axis), the eruption space of mandibular third molars(7D-ABR) and the eruption height of mandibular third molars(8-OP) were measured by software-generated lateral cephalometric radiographs. The cohort were classified into eruption group and un-eruption group according to the degree of impaction of the third molar during the second CBCT image. Logistic regression analysis was utilized to analyze the factors affecting the eruption status of mandibular third molars. Results Among the factors, Angle Class Ⅰ malocclusion, tooth extraction, the root formation of mandibularthirdmolars, a larger angle between the long axis of the third molar and the anterior skull base plane, and a smaller angle between the long axis of the second molar and the third molar were conducive to the eruption of mandibular third molars. Conclusion The eruption status of mandibular third molars after orthodontic treatment is influenced by several factors,including orthodontic extraction, development of mandibular third molars, Angle's classification, 8-OP, 7-8 axis, and 8axis-SN.

Key words: mandibular third molar, eruption status, orthodontic treatment

CLC Number:

R782.1

HUANG Hong, LI Yuan, JING Qiuping, SHI Yijin, YANG Shengjun, WANG Dongmiao. Factors affecting the eruption status of mandibular third molars in adolescent orthodontic patients[J]. Stomatology, 2023, 43(8): 697-701.

Figures/Tables 6

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References 25

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测量指标	定义
7D-ABR/mm	下颌第二磨牙冠远中冠接触点沿??平面到下颌升支前缘相交的距离
8-OP/mm	第三磨牙冠的最高点到??平面的距离
7-8axis/(°)	第二磨牙和第三磨牙长轴之间的角度
8axis-MP/(°)	第三磨牙的长轴与下颌平面之间的角度
RP-MP/(°)	下颌支平面和下颌平面之间的角度
8axis-SN/(°)	第三磨牙的长轴与前颅底平面之间的角度
8axis-FH/(°)	第三磨牙的长轴与眶耳平面之间的夹角
MP-SN/(°)	下颌平面和眶耳平面之间的角度
MP-FH/(°)	下颌平面和眶耳平面之间的夹角

相关因素	下颌第三磨牙状态		P
相关因素	萌出	未萌出	P
性别^a
女	206(69.1%)	66(55%)
男	92(30.9%)	54(45%)	0.01^*
减数拔牙^a
否	153(51.3%)	83(69.2%)
是	145(48.7%)	37(30.8%)	<0.01^*
下颌第三磨牙发育程度^a
仅牙冠形成	139(46.6%)	83(69.2%)
牙根形成	159(53.4%)	37(30.8%)	<0.01^*
安氏分类^a
Ⅰ类	116(38.9%)	34(28.3%)
Ⅱ类	70(23.5%)	54(45%)
Ⅲ类	112(37.6%)	32(26.7%)	<0.01^*
7D-ABR^b/mm	0.84±1.49	1.13±1.83	0.12
8-OP^b/mm	-0.57±1.06	-1.77±1.36	<0.01^*
8axis-SN^b/(°)	35.80±11.95	25.97±12.49	<0.01^*
7-8axis^b/(°)	26.15±9.68	35.20±11.77	<0.01^*
下颌平面角^b/(°)	37.81±6.03	36.72±6.06	0.09
下颌角^b/(°)	124.39±9.99	123.52±12.19	0.45

相关因素	下颌第三磨牙状态		P	95%CI
相关因素	萌出	未萌出	P	95%CI
性别
女	206(69.1%)	66(55%)
男	92(30.9%)	54(45%)	0.93	(0.54,1.95)
减数拔牙
否	153(51.3%)	83(69.2%)
是	145(48.7%)	37(30.8%)	0.02^*	(0.26,0.87)
下颌第三磨牙发育程度
仅牙冠形成	139(46.6%)	83(69.2%)
牙根形成	159(53.4%)	37(30.8%)	0.01^*	(0.22,0.78)
安氏分类
Ⅰ类	116(38.9%)	34(28.3%)
Ⅱ类	70(23.5%)	54(45%)	0.02^*	(1.11,4.58)
Ⅲ类	112(37.6%)	32(26.7%)	0.89	(0.51,2.17)
7D-ABR/mm	0.84±1.49	1.13±1.83	0.61	(0.97,1.26)
8-OP/mm	-0.57±1.06	-1.77±1.36	<0.01^*	(0.29,0.51)
8axis-SN/(°)	35.80±11.95	25.97±12.49	<0.01^*	(0.89,0.97)
7-8axis/(°)	26.15±9.68	35.20±11.77	0.02^*	(1.01,1.10)
下颌平面角/(°)	37.81±6.03	36.72±6.06	0.39	(0.92,1.03)
下颌角/(°)	124.39±9.99	123.52±12.19	0.29	(0.95,1.01)

Factors affecting the eruption status of mandibular third molars in adolescent orthodontic patients

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