拔牙矫治对恒牙早期下颌第二磨牙近远中向倾斜度的影响

doi:10.3969/j.issn.1006-5725.2024.13.012

Abstract

Abstract:

Objective This study aimed to explore the relationship between the spontaneous changes of mesiodistal angulation of lower second molars （L2M） and individual clinical characteristics in patients with early permanent dentition correction. Methods A total of 44 patients with a total of 88 mandibular second molars were included in this study after screening. Based on the frequency distribution histogram of the initial angle of inclination （L2M initial angle） of the L2M crown before treatment， it was divided into three groups： Group A： small angle group， L2M initial angle is 0° ~ 17.5°； Group B： medium angle group， L2M initial angle is 17.5° ~ 42.5°； Group C： large angle group， L2M initial angle is 42.5° ~ 60°. According to whether L2M has erupted and exposed most of the crown， it was divided into erupted group and unerupted group. According to the mandibular plane angle， it can be divided into high angle， low angle， and average angle. CBCT reconstructed panoramic images were used to measure the mesiodistal inclination of L2M and analyze the relationship between each group and the change in mesiodistal inclination angles of L2M. Results After treatment， L2M mesiodistal angulation in the small angle， large angle， non-eruption， and high angle groups became more significant. The angle in the middle angle group was significantly smaller. The L2M mesiodistal angulation in the eruption and average angle group did not change significantly.The angles of ANB， Y-axis， and mandibular plane have no correlation with the initial angle of L2M. Conclusion The L2M in patients with large and high angles is more likely to topple during a correction. During the correction， the L2M tends to approach the normal axial inclination.

Key words: early permanent dentition, lower second molars, mesiodistal angulation

CLC Number:

R783.5

Junfeng LIU,Xinqiong WANG,Wenzhong ZHANG,Yijing LI,Xiong ZHANG,Zhuannong ZHAO,Yuemei. PAN. Effects of orthodontic extraction on mesiodistal angulation of lower second molars in patients with early permanent dentition correction[J]. The Journal of Practical Medicine, 2024, 40(13): 1833-1839.

Figures/Tables 10

Fig.1

Fig.2

Fig.3

Fig.4

Tab.1

Tab.2

Tab.3

Tab.4

Tab.5

Tab.6

References 29

1	OKIHARA H，ONO T. Correction of bilateral heavily impacted second molar with improved super-elastic nickel-titanium alloy wires［J］. Am J Orthod Dentofacial Orthop， 2020，158（1）：114-125. doi:10.1016/j.ajodo.2019.03.033 doi: 10.1016/j.ajodo.2019.03.033
2	TURLEY P K. The management of mesially inclined/impacted mandibular permanent second molars［J］. J World Fed Orthod， 2020， 9：S45-S53. doi:10.1016/j.ejwf.2020.09.004 doi: 10.1016/j.ejwf.2020.09.004
3	EVANS R. Incidence of lower second permanent molar impaction［J］. Br J Orthod， 1988，15（3）：199-203. doi:10.1179/bjo.15.3.199 doi: 10.1179/bjo.15.3.199
4	FERRO F， FUNICIELLO G， PERILLO L， et al. Mandibular lip bumper treatment and second molar eruption disturbances［J］. Am J Orthod Dentofacial Orthop， 2011，139（5）：622-627. doi:10.1016/j.ajodo.2009.07.024 doi: 10.1016/j.ajodo.2009.07.024
5	FU P S， WANG J C， WU Y M， et al. Impacted mandibular second molars［J］. Angle Orthod， 2012. 82（4）：670-675. doi:10.2319/102111-656.1 doi: 10.2319/102111-656.1
6	范炜，高德国，王宇婷，等. 阻生下颌第二磨牙下颌骨的三维分析［J］. 华西口腔医学杂志， 2020， 38 （3）： 274-279. doi:10.7518/hxkq.2020.03.008 doi: 10.7518/hxkq.2020.03.008
7	SHAPIRA Y， FINKELSTEIN T， SHPACK N， et al. Mandibular second molar impaction. Part I： Genetic traits and characteristics［J］. Am J Orthod Dentofacial Orthop， 2011，140（1）：32-37. doi:10.1016/j.ajodo.2009.08.034 doi: 10.1016/j.ajodo.2009.08.034
8	THIESEN G， FREITAS M P M， ARAÚJO E A， et al. Three-dimensional evaluation of craniofacial characteristics related to mandibular asymmetries in skeletal Class I patients［J］. Am J Orthod Dentofacial Orthop， 2018，154（1）：91-98. doi:10.1016/j.ajodo.2017.10.031 doi: 10.1016/j.ajodo.2017.10.031
9	刘俊峰，赵转浓，张文忠，等. 安氏Ⅰ类骨面型Ⅰ类错正畸后下颌磨牙轴倾度的变化［J］. 实用医学杂志， 2023， 39 （8）： 969-974.
10	ANDREWS L F. The six keys to normal occlusion［J］. Am J Orthod， 1972，62（3）：296-309. doi:10.1016/s0002-9416(72)90268-0 doi: 10.1016/s0002-9416(72)90268-0
11	包涵，于晓艺，谢宁，等. 牙齿近远中倾斜度的影像学评价方法进展［J］. 口腔医学， 2021， 41（11）： 1039-1042，1056.
12	MCKEE I W， WILLIAMSON P C， LAM E W， et al. The accuracy of 4 panoramic units in the projection of mesiodistal tooth angulations［J］. Am J Orthod Dentofacial Orthop， 2002，121（2）：166-75； quiz 192. doi:10.1067/mod.2002.119435 doi: 10.1067/mod.2002.119435
13	OWENS A M， JOHAL A. Near-end of treatment panoramic radiograph in the assessment of mesiodistal root angulation［J］. Angle Orthod， 2008，78（3）：475-481. doi:10.2319/040107-161.1 doi: 10.2319/040107-161.1
14	PECK J L， SAMESHIMA G T， MILLER A， et al. Mesiodistal root angulation using panoramic and cone beam CT［J］. Angle Orthod， 2007，77（2）：206-213. doi:10.2319/0003-3219(2007)077[0206:mraupa]2.0.co;2 doi: 10.2319/0003-3219(2007)077[0206:mraupa]2.0.co;2
15	BAIK U B， BAYOME M， ABBAS N H， et al. Factors associated with spontaneous angular changes of impacted mandibular third molars as a result of second molar protraction［J］. Am J Orthod Dentofacial Orthop， 2019，156（2）：178-185. doi:10.1016/j.ajodo.2018.08.024 doi: 10.1016/j.ajodo.2018.08.024
16	VRANCKX M， OCKERMAN A， COUCKE W， et al. Radiographic prediction of mandibular third molar eruption and mandibular canal involvement based on angulation［J］. Orthod Craniofac Res， 2019，22（2）：118-123. doi:10.1111/ocr.12297 doi: 10.1111/ocr.12297
17	TONG H， ENCISO R， VAN ELSLANDE D， et al. A new method to measure mesiodistal angulation and faciolingual inclination of each whole tooth with volumetric cone-beam computed tomography images［J］. Am J Orthod Dentofacial Orthop， 2012，142（1）：133-143. doi:10.1016/j.ajodo.2011.12.027 doi: 10.1016/j.ajodo.2011.12.027
18	RAMIRO-VERDUGO J， DE VICENTE-COROMINAS E， MONTIEL-COMPANY J M， et al. Association between third molar agenesis and craniofacial structure development［J］. Am J Orthod Dentofacial Orthop， 2015，148（5）：799-804. doi:10.1016/j.ajodo.2015.05.025 doi: 10.1016/j.ajodo.2015.05.025
19	SÁNCHEZ M J， VICENTE A， BRAVO L A. Third molar agenesis and craniofacial morphology［J］. Angle Orthod， 2009，79（3）：473-478. doi:10.2319/0003-3219(2009)079[0473:tmaacm]2.0.co;2 doi: 10.2319/0003-3219(2009)079[0473:tmaacm]2.0.co;2
20	ALHAIJA E S ABU， ALBHAIRAN H M， ALKHATEEB S N. Mandibular third molar space in different antero-posterior skeletal patterns［J］. EurJ Orthod， 2011. 33（5）：570-576. doi:10.1093/ejo/cjq125 doi: 10.1093/ejo/cjq125
21	DEMIREL O， AKBULUT A. Evaluation of the relationship between gonial angle and impacted mandibular third molar teeth［J］. Anat Sci Int， 2020，95（1）：134-142. doi:10.1007/s12565-019-00507-0 doi: 10.1007/s12565-019-00507-0
22	RADHAKRISHNAN P D， SAPNA VARMA N K， AJITH V V. Dilemma of gonial angle measurement： Panoramic radiograph or lateral cephalogram［J］. Imaging Sci Dent， 2017，47（2）：93-97. doi:10.5624/isd.2017.47.2.93 doi: 10.5624/isd.2017.47.2.93
23	VALLETTA R， RONGO R， PANGO MADARIAGA A C， et al. Relationship between the Condylion-Gonion-Menton Angle and Dentoalveolar Heights［J］. Int J Environ Res Public Health， 2020，17（9）：3309. doi:10.3390/ijerph17093309 doi: 10.3390/ijerph17093309
24	BHULLAR M K， UPPAL A S， KOCHHAR G K， et al. Comparison of gonial angle determination from cephalograms and orthopantomogram［J］. Indian J Dent， 2014，5（3）：123-126. doi:10.4103/0975-962x.140820 doi: 10.4103/0975-962x.140820
25	BARONE S， ANTONELLI A， AVERTA F， et al. Does Mandibular Gonial Angle Influence the Eruption Pattern of the Lower Third Molar？ A Three-Dimensional Study［J］. J Clin Med， 2021，10（18）：4057. doi:10.3390/jcm10184057 doi: 10.3390/jcm10184057
26	CHUNG K R， KIM S H， MO S S， et al. Severe Class II division 1 malocclusion treated by orthodontic miniplate with tube［J］. Prog Orthod， 2005， 6（2）：172-186.
27	BEHBEHANI F， ARTUN J， THALIB L. Prediction of mandibular third-molar impaction in adolescent orthodontic patients［J］. Am J Orthod Dentofacial Orthop， 2006，130（1）：47-55. doi:10.1016/j.ajodo.2006.03.002 doi: 10.1016/j.ajodo.2006.03.002
28	RICHARDSON M E. The etiology and prediction of mandibular third molar impaction［J］. Angle Orthod， 1977，47（3）：165-172.
29	SADEK M M， SABET N E， HASSAN I T. Three-dimensional mapping of cortical bone thickness in subjects with different vertical facial dimensions［J］. Prog Orthod， 2016，17（1）：32. doi:10.1186/s40510-016-0145-x doi: 10.1186/s40510-016-0145-x

组别	年龄（岁）	性别（例）		萌出状态（例）		下颌角（例）		Nolla分期
组别	年龄（岁）	男	女	未萌	已萌	高角	均角	Nolla分期
P值	0.166	0.728		0.560		0.214		0.152
A组	13.10 ± 0.74	3	7	6	4	3	7	8.20 ± 0.79
B组	13.04 ± 1.51	14	13	12	15	8	19	8.44 ± 0.64
C组	12.00 ± 1.15	4	3	7	0	3	4	7.86 ± 0.90

项目	SNA	SNB	ANB	Yaix	下颌平面角
项目	SNA	SNB	ANB	Yaix	MP-SN	MP-FH
高角	78.44 ± 4.14	74.75 ± 2.88	3.69 ± 2.80	74.97 ± 2.05	44.99 ± 3.55	31.05 ± 3.96
均角	81.59 ± 3.00	79.23 ± 3.11	3.23 ± 1.86	69.86 ± 2.68	33.46 ± 3.83	25.60 ± 3.32

变量		初始角度（T1）	术后角度（T2）	变化值（T2-T1）	F值	P值
萌出状态	未萌	27.36 ± 16.63	33.01 ± 17.70	5.66 ± 10.27	3.441	0.001
萌出状态	已萌	24.18 ± 8.70	21.88 ± 10.33	-2.30 ± 10.83	-1.277	0.210
下颌平面角	均角	23.84 ± 10.77	23.27 ± 11.68	-0.57 ± 12.09	-0.334	0.740
下颌平面角	高角	29.81 ± 17.16	36.46 ± 18.69	6.64 ± 7.34	4.524	< 0.001
近远中角度	A组	10.53 ± 6.07	20.15 ± 7.62	9.63 ± 9.49	4.535	< 0.001
	B组	27.87 ± 6.83	24.70 ± 10.11	-3.17 ± 9.76	-2.226	0.031
	C组	52.12 ± 3.72	63.88 ± 4.19	11.75 ± 2.12	15.667	< 0.001

高角	初始角度（T1）	术后角度（T2）	变化值（T2-T1）	F值	P值
A组	7.83 ± 5.82	17.00 ± 7.05	9.17 ± 7.45	3.772	0.039
B组	29.65 ± 8.73	32.88 ± 9.70	3.24 ± 7.42
C组	52.17 ± 4.22	63.67 ± 4.93	11.50 ± 2.26

项目	LL2M均值	RL2M均值	（RL2M-LL2M）差值	t值	P值
初始角度	25.17 ± 13.99	25.84 ± 12.59	0.66 ± 7.35	0.550	0.585
术后角度	27.19 ± 16.30	27.22 ± 15.02	0.03 ± 5.49	0.030	0.976
治疗前后角度变化量	2.28 ± 10.93	1.38 ± 11.63	-0.63 ± 8.73	-0.445	0.659

Effects of orthodontic extraction on mesiodistal angulation of lower second molars in patients with early permanent dentition correction

RichHTML

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

Figures/Tables 10

References 29

Related Articles 1

Recommended Articles

Metrics

Comments

相关因素	相关系数	P值
下颌平面角	0.081	0.452
Yaix	0.163	0.128
ANB	0.194	0.069