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学科主题: 口腔医学
题名:
Root resorption after orthodontic intrusion and extrusion: An intraindividual study
作者: Han, GL; Huang, SF; den Hoff, JWV; Zeng, XL; Kuijpers-Jagtman, AM
关键词: orthodontics ; corrective ; tooth movement ; root resorption ; extrusion ; intrusion
刊名: ANGLE ORTHODONTIST
发表日期: 2005-11-01
卷: 75, 期:6, 页:912-918
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Dentistry, Oral Surgery & Medicine
研究领域[WOS]: Dentistry, Oral Surgery & Medicine
关键词[WOS]: TOOTH MOVEMENT ; FORCE MAGNITUDE ; ADOLESCENTS ; INCISORS ; CEMENTUM ; TEETH
英文摘要:

The aim of this investigation was to compare root resorption in the same individual after application of continuous intrusive and extrusive forces. In nine patients (mean age 15.3 years), the maxillary first premolars were randomly intruded or extruded with a continuous force of 100 cN for eight weeks. Eleven maxillary first premolars from six randomly selected orthodontic patients served as controls. Root resorption was determined using scanning electron microscopy. Quantitative assessment of the percentage of resorbed area of the total root surface was performed on composite micrographs. The severity of root resorption was also assessed by visual scoring of the roots. Root resorption mainly occurred at the apical part of the roots in both experimental groups. A significant difference in root resorption was found between the intruded and the control teeth (P = .006) but not between the extruded and the control teeth. However, the mesial and distal root surfaces showed resorption on 5.78 +/- 3.86% of the root surface of the intruded teeth and 1.28 +/- 1.24% of the root surface of the extruded teeth, and this difference was significant (P = .004). In addition, a large individual variation was found. From this study, it can be concluded that intrusion of teeth causes about four times more root resorption than extrusion. Because the amount of root resorption due to intrusion or extrusion in the same patient is correlated, every clinician should be aware that the extrusion of teeth might also cause root resorption in susceptible patients.

语种: 英语
WOS记录号: WOS:000233760800003
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.bjmu.edu.cn/handle/400002259/58712
Appears in Collections:北京大学口腔医学院_牙周科_期刊论文

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作者单位: 1.Univ Nijmegen, Med Ctr, Dept Orthodont & Oral Biol, NL-6500 HB Nijmegen, Netherlands
2.Wuhan Univ, Dept Orthodont, Sch & Hosp Stomatol, Wuhan 430072, Peoples R China
3.Beijing Univ, Sch & Hosp Stomatol, Dept Orthodont, Beijing 100871, Peoples R China

Recommended Citation:
Han, GL,Huang, SF,den Hoff, JWV,et al. Root resorption after orthodontic intrusion and extrusion: An intraindividual study[J]. ANGLE ORTHODONTIST,2005,75(6):912-918.
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