细丝弓技术在安氏Ⅱ类1分类拔牙患者直丝弓矫治的临床研究

doi:10.13591/j.cnki.kqyx.2023.12.006

Abstract

Abstract:

Objective To evaluate dentoskeletal and soft-tissue profile changes in Class Ⅱ division 1 extraction cases treated by the light archwire technique with straight-wire appliances. Methods A total of 24 Class Ⅱ division 1 cases met the inclusion criteria and were treated with the light archwire technique with a straight-wire appliance. Lateral cephalometric measurements were performed before and after treatment, and the statistical analysis was performed using SPSS 15.0 software. Significant changes were evaluated by paired t-tests at a 0.05 significance level. Results After performing the active treatment in 24 subjects, the molar and cuspid relationships were neutral, and normal overjets and overbites were established. U1-NA (°) and L1-MP (°) decreased by 15.78° and 6.18°, respectively. Maxillary and mandibular incisors retracted by 7.56 mm and 2.27 mm, respectively. The mesial movement of the mandibular molars was 4.41 mm, and the mesial movement of the maxillary molars was 1.17 mm. The lower incisors were intruded by 2.42 mm, and the lower molars were extruded by 1.21 mm. However, vertical changes in the maxillary incisors and molars were not significant. Remarkable soft-tissue changes were noted after orthodontic treatment. The NLA increased by 13.77°. The prominence of the upper and lower lips to the aesthetic plane were significantly decreased by 2.90 mm and 3.83 mm, respectively. Conclusion The Class Ⅱ division 1 patients treated with the light archwire technique with a straight archwire appliance showed good control of sagittal and vertical dimensions after the extraction of four first premolars, and the profile was significantly improved.

Key words: Class Ⅱ division 1 malocclusion, light archwire technique, Class Ⅱ intermaxillary elastics, straight-wire appliance

CLC Number:

R783.5

LI Guoyong,QI Yuanyuan,CAI Bin,XU Xianghua,CHENG Huijuan,WANG Yanling. Light archwire technique in Class Ⅱ division 1 extraction cases with straight-wire appliances[J]. Stomatology, 2023, 43(12): 1086-1090.

Figures/Tables 8

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References 18

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测量项目	矫治前		矫治后		矫治前后变化		P
测量项目	平均值	标准差	平均值	标准差	平均值	标准差	P
U1-SN角/(°)	118.49	8.68	102.72	5.12	-15.78	5.87	0.000^***
U1-L1角/(°)	108.21	6.48	128.45	5.11	20.24	6.73	0.000^***
IMPA角/(°)	102.45	6.90	96.27	7.12	-6.18	2.63	0.000^***
U1/PP距/mm	30.56	3.05	31.01	3.10	0.92	2.29	0.092
U6/PP距/mm	24.83	3.18	25.57	2.97	0.74	1.21	0.065
L1/MP距/mm	44.31	3.56	41.89	3.01	-2.42	3.43	0.038^*
L6/MP距/mm	35.47	2.78	36.67	2.90	1.21	0.92	0.009^**
U1/PTV距/mm	64.18	2.69	56.62	2.48	-7.56	2.98	0.000^***
L1/PTV距/mm	56.88	2.71	53.90	2.32	-2.27	1.61	0.004^**
U6/PTV距/mm	27.92	2.40	29.09	2.56	1.17	1.98	0.041^*
L6/PTV距/mm	29.03	3.81	32.44	4.75	4.11	2.10	0.006^**
覆盖/mm	7.28	2.61	2.82	0.91	-4.46	2.26	0.003^**
覆牙合/mm	2.78	2.01	2.17	0.58	-0.61	-1.90	0.361

测量项目	矫治前		矫治后		矫治前后变化		P
测量项目	平均值	标准差	平均值	标准差	平均值	标准差	P
SNA角/(°)	80.81	3.46	80.52	3.75	-0.29	1.12	0.019^*
SNB角/(°)	75.10	3.41	74.63	3.22	-0.47	0.63	0.068
ANB角/(°)	5.71	2.32	5.89	2.48	0.18	2.31	0.376
SN-MP角/(°)	35.03	5.16	35.18	5.31	0.42	2.46	0.216
FMA角/(°)	29.16	4.68	29.27	4.79	0.10	1.32	0.227
前下面高/mm	72.76	6.01	73.69	6.89	0.93	2.01	0.121
前面高/mm	125.21	7.43	126.02	7.14	0.81	1.78	0.155
后面高/mm	78.29	6.86	79.19	7.02	0.90	1.61	0.021^*
后面高/前面高/(%)	62.78	4.56	62.91	4.41	0.13	1.42	0.325

测量项目	矫治前		矫治后		矫治前后变化		P
测量项目	平均值	标准差	平均值	标准差	平均值	标准差	P
G-SN-Pg角/(°)	14.11	5.01	14.65	5.27	0.53	2.28	0.463
鼻唇角/(°)	89.04	8.12	102.81	6.39	13.77	6.31	0.000^***
E平面-Ss距/mm	2.39	1.98	-0.51	2.10	-2.90	1.78	0.003^**
E平面-Li距/mm	4.86	2.13	1.03	1.36	-3.83	1.97	0.004^**

Light archwire technique in Class Ⅱ division 1 extraction cases with straight-wire appliances

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[1]	. Cephalometric analysis of adolescents with Angle class II division 1 malocclusion treated with transmission straight wire appliance [J]. , 2016, 36(3): 223-227.
[2]	. Efficacy evaluation of two functional appliances by correlation analysis [J]. , 2014, 34(6): 457-460.