Relationship between the amount of mesial movement of the mandibular first molar and angular changes of the mandibular third molar: A retrospective comparative study in growing patients with and without first premolar extraction

IF 1.8 Q2 DENTISTRY, ORAL SURGERY & MEDICINE
Fatemeh Azizi , Ali Naghib Zadeh , Amin Golshah , Mohammad Moslem Imani , Roya Safari-Faramani
{"title":"Relationship between the amount of mesial movement of the mandibular first molar and angular changes of the mandibular third molar: A retrospective comparative study in growing patients with and without first premolar extraction","authors":"Fatemeh Azizi ,&nbsp;Ali Naghib Zadeh ,&nbsp;Amin Golshah ,&nbsp;Mohammad Moslem Imani ,&nbsp;Roya Safari-Faramani","doi":"10.1016/j.ortho.2023.100779","DOIUrl":null,"url":null,"abstract":"<div><h3>Objectives</h3><p><span>The main objective of this study was to assess the relationship of the amount of mesial movement of mandibular first molar<span> (MFM) and angular changes of the mandibular third molar (MTM) in </span></span>orthodontic patients. The secondary objective of this study was to compare the obtained values in extraction and non-extraction orthodontic patients.</p></div><div><h3>Material and methods</h3><p><span>In this cross-sectional retrospective study were enrolled all the eligible patients (12–16 years) with and without first premolar extraction that met the inclusion criteria. The angle between the longitudinal axis of MTM and horizontal reference plane (HRP) (to calculate the angular change of MTM), and the distance between the </span>cementoenamel junction<span><span> of the mesial surface of MFM and the bisector of the anterior nasal spine and nasal septum (to determine the amount of mesial movement of MFM) were measured on pre- and post-treatment </span>panoramic radiographs. The correlation between the two variables was analysed and compared between extraction and non-extraction patients using STATA v. 14.2 software.</span></p></div><div><h3>Results</h3><p>A total of 100 fixed orthodontic patients with and without first premolar extraction (<em>n</em> <!-->=<!--> <!-->50) whose treatment had been accomplished were included in the study. In the non-extraction group, the mean amount of mesial movement of MFM was 1.45<!--> <!-->mm and the mean angular change of MTM was 4.28 degrees; this correlation was significant (<em>P</em> <!-->&lt;<!--> <!-->0.05). These values were 2.98<!--> <!-->mm and 7.17 degrees in the first premolar extraction group, respectively, with a significant correlation (<em>P</em> <!-->&lt;<!--> <!-->0.05). However, the difference in this respect was not significant between the two groups (<em>P</em> <!-->&gt;<!--> <!-->0.05). According to the regression model, 1<!--> <!-->mm mesial movement of MFM would averagely cause 2.2-degree angular change in MTM, adjusting for the effect of extraction/non-extraction treatment plan.</p></div><div><h3>Conclusion</h3><p>The mesial movement of MFM was significantly correlated with the angular changes of MTM in extraction and non-extraction orthodontic patients, with no significant difference between them.</p></div>","PeriodicalId":45449,"journal":{"name":"International Orthodontics","volume":"21 3","pages":"Article 100779"},"PeriodicalIF":1.8000,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Orthodontics","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S176172272300058X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}
引用次数: 0

Abstract

Objectives

The main objective of this study was to assess the relationship of the amount of mesial movement of mandibular first molar (MFM) and angular changes of the mandibular third molar (MTM) in orthodontic patients. The secondary objective of this study was to compare the obtained values in extraction and non-extraction orthodontic patients.

Material and methods

In this cross-sectional retrospective study were enrolled all the eligible patients (12–16 years) with and without first premolar extraction that met the inclusion criteria. The angle between the longitudinal axis of MTM and horizontal reference plane (HRP) (to calculate the angular change of MTM), and the distance between the cementoenamel junction of the mesial surface of MFM and the bisector of the anterior nasal spine and nasal septum (to determine the amount of mesial movement of MFM) were measured on pre- and post-treatment panoramic radiographs. The correlation between the two variables was analysed and compared between extraction and non-extraction patients using STATA v. 14.2 software.

Results

A total of 100 fixed orthodontic patients with and without first premolar extraction (n = 50) whose treatment had been accomplished were included in the study. In the non-extraction group, the mean amount of mesial movement of MFM was 1.45 mm and the mean angular change of MTM was 4.28 degrees; this correlation was significant (P < 0.05). These values were 2.98 mm and 7.17 degrees in the first premolar extraction group, respectively, with a significant correlation (P < 0.05). However, the difference in this respect was not significant between the two groups (P > 0.05). According to the regression model, 1 mm mesial movement of MFM would averagely cause 2.2-degree angular change in MTM, adjusting for the effect of extraction/non-extraction treatment plan.

Conclusion

The mesial movement of MFM was significantly correlated with the angular changes of MTM in extraction and non-extraction orthodontic patients, with no significant difference between them.

下颌第一磨牙近缘运动量与下颌第三磨牙角度变化的关系:一项对未拔除第一前磨牙的生长期患者的回顾性比较研究
目的探讨正畸患者下颌第一磨牙(MFM)近缘运动量与下颌第三磨牙(MTM)角度变化的关系。本研究的次要目的是比较拔牙和非拔牙正畸患者所获得的数值。材料和方法本横断面回顾性研究纳入所有符合纳入标准的患者(12-16岁),无论是否进行第一前磨牙拔牙。在治疗前后的全景x线片上测量MTM纵轴与水平参考平面(HRP)之间的夹角(用于计算MTM的角度变化),以及MFM近近面牙骨质-牙釉质交界处与鼻前棘和鼻中隔平分线之间的距离(用于确定MFM近近运动的量)。使用STATA v. 14.2软件分析和比较拔牙和未拔牙患者两个变量之间的相关性。结果共纳入100例固定正畸患者(n = 50),这些患者均完成了第一前磨牙拔牙和未拔牙的治疗。未拔牙组MFM平均内侧移动1.45 mm,平均角度变化4.28°;这种相关性是显著的(P <0.05)。第一前磨牙拔牙组的牙尖度和牙尖度分别为2.98 mm和7.17度,相关性显著(P <0.05)。然而,两组在这方面的差异并不显著(P >0.05)。根据回归模型,MFM的中间移动1 mm平均会导致MTM的角度变化2.2度,调整了拔牙/不拔牙治疗方案的效果。结论拔牙与非拔牙正畸患者MFM的近端运动与MTM的角度变化有显著相关,两者之间无显著差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
International Orthodontics
International Orthodontics DENTISTRY, ORAL SURGERY & MEDICINE-
CiteScore
2.50
自引率
13.30%
发文量
71
审稿时长
26 days
期刊介绍: Une revue de référence dans le domaine de orthodontie et des disciplines frontières Your reference in dentofacial orthopedics International Orthodontics adresse aux orthodontistes, aux dentistes, aux stomatologistes, aux chirurgiens maxillo-faciaux et aux plasticiens de la face, ainsi quà leurs assistant(e)s. International Orthodontics is addressed to orthodontists, dentists, stomatologists, maxillofacial surgeons and facial plastic surgeons, as well as their assistants.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信