Comparison of inclination and vertical changes between single-wire and double-wire retraction techniques in lingual orthodontics.

IF 1.9 3区 医学 Q1 Dentistry
Korean Journal of Orthodontics Pub Date : 2020-01-01 Epub Date: 2020-01-22 DOI:10.4041/kjod.2020.50.1.26
Bui Quang Hung, Mihee Hong, Wonjae Yu, Hee-Moon Kyung
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引用次数: 3

Abstract

Objective: The Heat Induction Typodont System (HITS), used in some recent studies, has a distinct advantage over previous tooth movement simulation methods. This study aimed to compare inclination and vertical changes between the single-wire and double-wire techniques during en masse retraction with different lengths of lever arms in lingual orthodontics using an upgraded version of the HITS.

Methods: Duet lingual brackets, which have two main slots, were used in this study. Forty samples were divided into four groups according to the length of the lever arm (3-mm or 6-mm hook) and the retraction wire (single-wire or double-wire). Four millimeters of en masse retraction was performed using lingual appliances. Thereafter, 3-dimensional-scanned images of the typodont were analyzed to measure inclination and vertical changes of the anterior teeth.

Results: Incisor inclination presented more changes in the single-wire groups than in the double-wire groups. However, canine inclination did not differ between these groups. Regarding vertical changes, only the lateral incisors in the single-wire groups presented significantly larger values than did those in the double-wire groups. Combining the effect of hook lengths, among the four groups, the single-wire group with the 3-mm hook had the highest value, while the double-wire group with the 6-mm hook showed the least decrease in crown inclination and extrusion.

Conclusions: The double-wire technique with an extended lever arm provided advantages over the single-wire technique with the same lever arm length in preventing torque loss and extrusion of the anterior teeth during en masse retraction in lingual orthodontics.

单线与双线牵入技术在舌正畸中倾斜和垂直变化的比较。
目的:热感应排位系统(HITS)与以往的牙齿运动模拟方法相比具有明显的优势,近年来在一些研究中得到应用。本研究的目的是比较单线和双线技术在舌正畸中不同长度的杠杆臂大规模内收时的倾斜度和垂直度变化。方法:采用双牙托槽,有两个主槽。根据杠杆臂长度(3mm或6mm钩)和牵回丝长度(单丝或双丝)将40个样本分为4组。使用舌部矫治器进行4毫米的整体内收。然后,对印型齿的三维扫描图像进行分析,以测量前牙的倾斜和垂直变化。结果:单丝组切牙倾斜度变化明显大于双丝组。然而,狗的倾斜度在这两组之间没有差异。在垂直变化方面,单丝组只有侧切牙的数值明显大于双丝组。综合钩长影响,4组中,3 mm钩单丝组最大,6 mm钩双丝组冠倾和挤压减小最小。结论:在舌正畸术中,双丝延长杠杆臂技术在预防前牙大规模内收时的扭矩损失和前牙挤压方面优于同杠杆臂长度的单丝技术。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Korean Journal of Orthodontics
Korean Journal of Orthodontics Dentistry-Orthodontics
CiteScore
2.60
自引率
10.50%
发文量
48
审稿时长
3 months
期刊介绍: The Korean Journal of Orthodontics (KJO) is an international, open access, peer reviewed journal published in January, March, May, July, September, and November each year. It was first launched in 1970 and, as the official scientific publication of Korean Association of Orthodontists, KJO aims to publish high quality clinical and scientific original research papers in all areas related to orthodontics and dentofacial orthopedics. Specifically, its interest focuses on evidence-based investigations of contemporary diagnostic procedures and treatment techniques, expanding to significant clinical reports of diverse treatment approaches. The scope of KJO covers all areas of orthodontics and dentofacial orthopedics including successful diagnostic procedures and treatment planning, growth and development of the face and its clinical implications, appliance designs, biomechanics, TMJ disorders and adult treatment. Specifically, its latest interest focuses on skeletal anchorage devices, orthodontic appliance and biomaterials, 3 dimensional imaging techniques utilized for dentofacial diagnosis and treatment planning, and orthognathic surgery to correct skeletal disharmony in association of orthodontic treatment.
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