The ectopic mandibular canines can start tooth formation in three different locations: a case series study based on single orthopantomograms from 47 individuals.

IF 2.3 Q2 DENTISTRY, ORAL SURGERY & MEDICINE European Archives of Paediatric Dentistry Pub Date : 2024-04-01 Epub Date: 2024-03-19 DOI:10.1007/s40368-024-00865-y
P Svanholt, M Svanholt, J Thomsen, I Kjær
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Abstract

Introduction: A former study on orthopantomograms from young children with abnormal dental development (not canine ectopia) demonstrated that the tooth bud of the mandibular canine, compared to a stable longitudinal canine axis, could be located normally, anteriorly or posteriorly, with close relation to the first premolar.

Aim: The aim of the present study is to analyse on orthopantomograms if the canine axis can demonstrate where the ectopic mandibular canine started tooth formation.

Materials: The material consists of orthopantomograms with ectopic mandibular canines and presence of primary mandibular canines from 47 cases (29 cases 9-21 years old and 18 cases with unknown ages). The primary canines demonstrated from minor apical resorption to more severe apical resorption.

Methods: Based on canine maturity, location of the canine axes and the interrelationships between the roots of the permanent canine and first premolar, the location from where the canine started tooth formation was determined. Canine maturity. Maturity stage below half root length and maturity stage above half root length revealed that 11 ectopic canines had less than half root length and 36 cases more than half root length. Canine axes. The canine axis, through the length of the primary canines Ax, is inserted on drawings of the orthopantomograms using the tracing programme Inkscape®. Interrelationship between roots. By visual inspection, the distance between the canine and first premolar was designated close distance, normal distance and extended distance.

Results: The results are divided into 3 groups. Group 1: The initial site of the permanent ectopic canine is located within the canine axis (6 cases). Group 2: The initial site of the permanent ectopic canine is located posterior to the canine axis (36 cases). Group 3: The initial site of the permanent ectopic canine is located anterior to the canine axis (5 cases).

Conclusion: The study explained that the canine axis could divide cases of ectopic canines into three groups according to the location from where tooth formation starts. For getting closer to the pattern of the ectopic canine eruption, it is necessary to analyse series of orthopantomograms taken from the same individual over several years.

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异位下颌犬齿可在三个不同位置开始形成:基于 47 个个体的单个正侧位图的病例系列研究。
前言以前对牙齿发育异常(非犬齿异位)的幼儿进行的一项正侧位研究表明,与稳定的纵向犬齿轴相比,下颌犬齿的齿芽可以正常地位于前方或后方,与第一前磨牙关系密切:材料:材料包括 47 个病例(29 例 9-21 岁,18 例年龄未知)的下颌异位犬齿和原发性下颌犬齿的正侧位图。原生犬齿表现为轻微的根尖吸收和较严重的根尖吸收:方法:根据犬齿的成熟度、犬齿轴的位置以及恒牙根与第一前磨牙之间的相互关系,确定犬齿开始形成牙齿的位置。犬齿成熟度。低于半根长度的成熟阶段和高于半根长度的成熟阶段显示,11 个异位犬齿的根长低于半根长度,36 个异位犬齿的根长超过半根长度。犬轴。使用 Inkscape® 描图程序在正侧位图上插入通过主犬齿长度 Ax 的犬齿轴。牙根之间的相互关系。通过目测,将犬齿和第一前臼齿之间的距离分为近距离、正常距离和远距离:结果分为三组。第一组:永久异位犬齿的初始部位位于犬齿轴内(6 例)。第二组:永久性异位犬齿的初始部位位于犬轴后方(36 例)。结论:研究表明,根据牙齿形成的起始位置,犬齿轴可将异位犬齿病例分为三组。为了更接近异位犬齿萌出的模式,有必要对同一人数年内拍摄的一系列正畸照片进行分析。
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来源期刊
European Archives of Paediatric Dentistry
European Archives of Paediatric Dentistry DENTISTRY, ORAL SURGERY & MEDICINE-
CiteScore
4.40
自引率
9.10%
发文量
81
期刊介绍: The aim and scope of European Archives of Paediatric Dentistry (EAPD) is to promote research in all aspects of dentistry for children, including interceptive orthodontics and studies on children and young adults with special needs. The EAPD focuses on the publication and critical evaluation of clinical and basic science research related to children. The EAPD will consider clinical case series reports, followed by the relevant literature review, only where there are new and important findings of interest to Paediatric Dentistry and where details of techniques or treatment carried out and the success of such approaches are given.
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