Comprehensive assessment of atypical-extraction orthodontic treatment

doi:10.7518/hxkq.2017.02.013

Abstract

Abstract:

Objective To discuss through retrospective study associated factors influencing orthodontists to develop ortho-dontic treatment plans and to calculate constituent ratio of a typical extraction in orthodontic treatment. Methods Systematic sampling was performed among 7 344 orthodontic patients, who received orthodontic treatment from April 2012 to March 2014 in the Department of Orthodontics, West China Hospital of Stomatology, Sichuan University. The study included statistical data on factors that may influence development of treatment plans. Samples were used to calculate extraction-ratio and atypical-extraction-ratio. Research focused on associated factors influencing development of treatment plans while evaluating correlation significances of each factor. Finally, treatment outcomes of atypical-extraction were compared with those of typical-extraction. Results Among studied patients, 55.31% (406/734) received orthodontic extraction treatment. In orthodontic-extraction-treated patients, typical-extraction accounted for 59.11% (240/406), orthodontists-selected atypical-extraction accounted for 23.15% (94/406), and passive atypical-extraction accounted for 17.73% (72/406). With statistical analysis, we inferred associated factors influencing development of treatment plans as follows: sex and age of patients, sex of orthodontists, accurate condition of specific teeth, Angle’s classification, and degree of midline deviation. Tooth loss before treatment also directly influences passive atypical-extraction. Statistically significant factors were not obtained. Significant difference of treatment outcome was not observed between atypical-extraction and typical-extraction-orthodontic treatment (P>0.05). Conclusion Above mentioned factors may influence orthodontists to develop treatment plans. However, orthodontists should also consider expected results of treatment strategies to prepare indi-vidual treatment plans on the basis of comprehensive analysis.

Key words: orthodontics, atypical-extraction, treatment outcome

CLC Number:

R783.5

Yijia Xie, Zhou Hu, Qing Zhao, Fuwei Lin, Yang Zeng, Xiaomei Xu, Lin Zeng, Pu Yang. Comprehensive assessment of atypical-extraction orthodontic treatment[J]. West China Journal of Stomatology, 2017, 35(2): 176-182.

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PAR指标	权重
上前牙排列	1
下前牙排列	1
双侧后牙咬合	1
覆盖	6
覆牙合	2
中线	4

变量	赋值	系数B	标准误	Wald	P值	Exp(B)	95%可信区间
变量	赋值	系数B	标准误	Wald	P值	Exp(B)	下限	上限
X₁	患者性别	1.207	0.376	10.300	0.001	3.345	1.600	6.992
X₂	患者年龄	0.671	0.338	3.942	0.047	1.957	1.009	3.796
X₃	医生性别	0.919	0.356	6.659	0.010	2.507	1.247	5.037
X₅	个别牙情况			71.270	0.000
X₅₍₁₎	缺牙、拔除	3.055	0.525	33.841	0.000	21.223	7.582	59.407
X₅₍₂₎	严重错位、阻生	2.948	0.488	36.498	0.000	19.064	7.326	49.607
X₅₍₃₎	损坏、畸形	3.397	0.541	39.356	0.000	29.865	10.335	86.306
X₇	Angle分类			14.854	0.038
X₇₍₁₎	Angle分类（Ⅱ¹类）	0.743	0.469	2.511	0.113	2.103	0.839	5.272
X₇₍₂₎	Angle分类（Ⅱ¹亚类）	1.668	0.550	9.197	0.002	5.302	1.804	15.581
X₇₍₃₎	Angle分类（Ⅱ²类）	1.092	0.704	2.405	0.121	2.980	0.750	11.848
X₇₍₄₎	Angle分类（Ⅱ²亚类）	0.586	0.831	0.498	0.480	1.798	0.353	9.163
X₇₍₅₎	Angle分类（Ⅲ类）	0.378	0.621	0.370	0.543	1.459	0.432	4.927
X₇₍₆₎	Angle分类（Ⅲ亚类）	-0.909	0.774	1.379	0.240	0.403	0.088	1.838
X₈	中线偏斜程度	1.124	0.479	5.502	0.019	3.079	1.203	7.878
常数项		-4.085	0.565	52.334	0.000	0.017

疗效	人数			秩次范围	平均秩次	秩和
疗效	非常规拔牙	常规拔牙	合计	秩次范围	平均秩次	非常规拔牙	常规拔牙
变坏或没改善	4	9	13	1~13	7	28	63
改善	14	30	44	14~57	35.5	497	1 065
极大改善	12	51	63	58~120	89	1 068	4 539
合计	30	90	120			1 593	5 667