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Article: Factors influencing the changes of lower third molars' angulation and space/crown width ratio by orthodontic treatment

TitleFactors influencing the changes of lower third molars' angulation and space/crown width ratio by orthodontic treatment
影响口腔正畸治疗患者下颌第三磨牙状态改变的因素分析
Authors
Issue Date2011
PublisherPeking University Health Science Center. The Journal's web site is located at http://xuebao.bjmu.edu.cn/
Citation
北京大学学报 (医学版), 2011, v. 43 n. 2, p. 267-271 How to Cite?
Journal of Peking University (Health Sciences), 2011, v. 43 n. 2, p. 267-271 How to Cite?
AbstractOBJECTIVE: To investigate the factors which influence the changes of lower third molars' angulation and space/crown width ratio by orthodontic treatment. METHODS: Pretreatment and posttreatment panoramic radiographs of 120 orthodontically treated cases were taken. The lower third molars' angulation and space/crown width ratio were examined and the relative factors on changes were analyzed. RESULTS: (1)The changes of the lower third molars' angulation and space/crown width ratio after orthodontic treatment were quite different among the cases. (2)The factors which influenced these changes mainly included extraction, mandibular plane angle, angulation and space/crown width ratio of lower third molar before orthodontic treatment. (3) Extraction was the most significantly variable associated with lower third molars' upright (angulation <30 degree) after orthodontic treatment. CONCLUSION: Orthodontic extraction is helpful to upright the lower third molars and to increase the space for third molars; and the pre-treatment lower third molars' angulation and space/crown width ratio are important variables for the changes after treatment; cases with lower mandibular plane angle are apt to greater possibility for the lower third molars' upright. 目的:研究影响口腔正畸患者治疗前、后下颌第三磨牙状态改变的因素。方法:利用正畸治疗前、后的全口曲面断层片,测量120例正畸患者的120颗下颌第三磨牙[男37例,女83例,年龄在1024岁,平均(14.1±3.3)岁]前倾角度和间隙/宽度比值的改变,统计分析影响正畸治疗前、后改变的因素。结果:(1)正畸治疗前、后下颌第三磨牙前倾角度和间隙/宽度比值的改变个体差别较大;(2)影响正畸治疗前、后下颌第三磨牙前倾角度和间隙/宽度比值改变的因素主要有拔牙、下颌平面角、治疗前的前倾角度和间隙/宽度比值(P〈0.05),而骨龄和牙龄等因素对下颌第三磨牙状态的影响差异无统计学意义;(3)Logistic回归分析,进入治疗后下颌第三磨牙前倾角度是否〈30°判别方程的因素有拔牙、下颌平面角和治疗前的前倾角度,其中拔牙状况影响程度较大,拔牙使得治疗后的前倾角度〈30°(直立倾向)的可能性更大,是不拔牙的4.210倍。结论:正畸拔牙治疗有助于下颌第三磨牙的直立,并使其萌出间隙增大;第三磨牙治疗前的状况(前倾角度和间隙/宽度比值)也是影响治疗后改变的重要因素;下颌平面角度小的患者预后下颌第三磨牙直立的可能性增加。
Persistent Identifierhttp://hdl.handle.net/10722/134995
ISSN
2015 SCImago Journal Rankings: 0.144

 

DC FieldValueLanguage
dc.contributor.authorLi, XTen_US
dc.contributor.authorZhang, DMen_US
dc.contributor.authorYang, YQen_US
dc.date.accessioned2011-07-27T01:25:31Z-
dc.date.available2011-07-27T01:25:31Z-
dc.date.issued2011en_US
dc.identifier.citation北京大学学报 (医学版), 2011, v. 43 n. 2, p. 267-271zh_HK
dc.identifier.citationJournal of Peking University (Health Sciences), 2011, v. 43 n. 2, p. 267-271-
dc.identifier.issn1671-167X-
dc.identifier.urihttp://hdl.handle.net/10722/134995-
dc.description.abstractOBJECTIVE: To investigate the factors which influence the changes of lower third molars' angulation and space/crown width ratio by orthodontic treatment. METHODS: Pretreatment and posttreatment panoramic radiographs of 120 orthodontically treated cases were taken. The lower third molars' angulation and space/crown width ratio were examined and the relative factors on changes were analyzed. RESULTS: (1)The changes of the lower third molars' angulation and space/crown width ratio after orthodontic treatment were quite different among the cases. (2)The factors which influenced these changes mainly included extraction, mandibular plane angle, angulation and space/crown width ratio of lower third molar before orthodontic treatment. (3) Extraction was the most significantly variable associated with lower third molars' upright (angulation <30 degree) after orthodontic treatment. CONCLUSION: Orthodontic extraction is helpful to upright the lower third molars and to increase the space for third molars; and the pre-treatment lower third molars' angulation and space/crown width ratio are important variables for the changes after treatment; cases with lower mandibular plane angle are apt to greater possibility for the lower third molars' upright. 目的:研究影响口腔正畸患者治疗前、后下颌第三磨牙状态改变的因素。方法:利用正畸治疗前、后的全口曲面断层片,测量120例正畸患者的120颗下颌第三磨牙[男37例,女83例,年龄在1024岁,平均(14.1±3.3)岁]前倾角度和间隙/宽度比值的改变,统计分析影响正畸治疗前、后改变的因素。结果:(1)正畸治疗前、后下颌第三磨牙前倾角度和间隙/宽度比值的改变个体差别较大;(2)影响正畸治疗前、后下颌第三磨牙前倾角度和间隙/宽度比值改变的因素主要有拔牙、下颌平面角、治疗前的前倾角度和间隙/宽度比值(P〈0.05),而骨龄和牙龄等因素对下颌第三磨牙状态的影响差异无统计学意义;(3)Logistic回归分析,进入治疗后下颌第三磨牙前倾角度是否〈30°判别方程的因素有拔牙、下颌平面角和治疗前的前倾角度,其中拔牙状况影响程度较大,拔牙使得治疗后的前倾角度〈30°(直立倾向)的可能性更大,是不拔牙的4.210倍。结论:正畸拔牙治疗有助于下颌第三磨牙的直立,并使其萌出间隙增大;第三磨牙治疗前的状况(前倾角度和间隙/宽度比值)也是影响治疗后改变的重要因素;下颌平面角度小的患者预后下颌第三磨牙直立的可能性增加。zh_HK
dc.languagechien_US
dc.publisherPeking University Health Science Center. The Journal's web site is located at http://xuebao.bjmu.edu.cn/-
dc.relation.ispartof北京大学学报 (医学版)zh_HK
dc.relation.ispartofJournal of Peking University (Health Sciences)-
dc.subject.meshMalocclusion - therapy-
dc.subject.meshMolar, Third - growth and development - physiology-
dc.subject.meshOrthodontic Space Closure-
dc.subject.meshOrthodontics, Corrective - methods-
dc.subject.meshTooth Eruption-
dc.titleFactors influencing the changes of lower third molars' angulation and space/crown width ratio by orthodontic treatmenten_US
dc.title影响口腔正畸治疗患者下颌第三磨牙状态改变的因素分析zh_HK
dc.typeArticleen_US
dc.identifier.emailYang, YQ: yangyanq@hkucc.hku.hken_US
dc.identifier.authorityYang, YQ=rp00045en_US
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.pmid21503124-
dc.identifier.scopuseid_2-s2.0-84860596425-
dc.identifier.hkuros188894en_US
dc.identifier.volume43en_US
dc.identifier.issue2-
dc.identifier.spage267en_US
dc.identifier.epage271en_US
dc.publisher.placeChina-

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