Justification of use of fixed retainers based on the analysis of size of the incisor and canine crowns

IF 0.2 Q4 MEDICINE, GENERAL & INTERNAL

Bulletin of Russian State Medical University Pub Date : 2022-12-31 DOI:10.24075/brsmu.2022.069

M. Postnikov, AV Butvilovsky, Aam Alsharifi, AV Madatyan, I. Kopetskiy, D. Eremin

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Abstract

Anatomical features of the teeth should be accounted for dental treatment plans. The need for constant monitoring of changes in the dentition system determines the relevance of this research. The study aimed to establish the size of anterior teeth with the help of odontometry. We made bi-layer single stage impressions and cast diagnostic models of the anterior teeth of 50 male and 50 female participants aged 18–24 years. The absolute sizes of crowns of incisors and canines were established. To assess the reduction of lateral incisors, we calculated the interincisor index (Ii) of teeth 22 and 21; sexual dimorphism was determined using the Garn–Lewis formula. It was discovered that there are no differences in the mesiodistal widths of crowns of contralateral teeth on the right and left sides (p > 0.05). The mesiodistal width of crowns of anterior teeth decreases (significant changes) in the following order: maxillary central incisors → maxillary canines → mandibular canines and maxillary lateral incisors → mandibular lateral incisors → mandibular central incisors. The degree of reduction of lateral incisors is low (Ii = 74.9) and more prominent in males than in females. In the examined patients, the greatest mean length of crowns of anterior teeth is that of upper central incisors and lower canines, while upper canines are shorter in length and upper lateral incisors, lower central and lateral incisors have the shortest mean crown length. Males have longer (mean length) crowns of lower canines, upper incisors and canines than females, the difference being significant (p < 0.001). The parameters of the crowns determined in this study showed that they have sufficient height and mesiodistal width, which, together with the low degree of reduction of the lateral incisors, justifies the possibility of direct fabrication of orthodontic fixed retainers. The data can also be used at the stage of dental treatment planning.

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基于切牙和犬齿牙冠尺寸分析的固定固位器使用合理性

牙齿的解剖特征应考虑到牙科治疗计划。持续监测牙列系统变化的需要决定了这项研究的相关性。这项研究旨在借助齿形测量法确定前牙的大小。我们对50名18-24岁的男性和50名女性参与者的前牙制作了双层单阶段印模和铸造诊断模型。确定了切牙和犬齿牙冠的绝对大小。为了评估侧切牙的减少，我们计算了22和21颗牙齿的内切牙指数（Ii）；性二态性是用Garn-Lewis公式确定的。研究发现，左右两侧对侧牙冠的近中宽度无差异（p>0.05）→ 上颌犬科→ 下颌犬齿和上颌侧切牙→ 下颌侧切牙→ 下颌中切牙。侧切牙的缩小程度较低（Ii=74.9），男性比女性更突出。在检查的患者中，前牙牙冠的最大平均长度是上中切牙和下犬齿，而上犬齿的长度较短，上侧切牙、下中切牙、侧切牙的平均牙冠长度最短。男性下犬齿、上切牙和犬齿的牙冠（平均长度）比女性长，差异显著（p＜0.001）。本研究确定的牙冠参数表明，它们有足够的高度和近中宽度，再加上侧切牙的缩小程度较低，证明了直接制造正畸固定固位器的可能性。这些数据也可以在牙科治疗计划阶段使用。

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

Bulletin of Russian State Medical University MEDICINE, GENERAL & INTERNAL-

CiteScore

0.80

自引率

0.00%

发文量

期刊介绍： Bulletin of Russian State Medical University (Bulletin of RSMU, ISSN Print 2500–1094, ISSN Online 2542–1204) is a peer-reviewed medical journal of Pirogov Russian National Research Medical University (Moscow, Russia). The original language of the journal is Russian (Vestnik Rossiyskogo Gosudarstvennogo Meditsinskogo Universiteta, Vestnik RGMU, ISSN Print 2070–7320, ISSN Online 2070–7339). Founded in 1994, it is issued once every two months publishing articles on clinical medicine and medical and biological sciences, first of all oncology, neurobiology, allergy and immunology, medical genetics, medical microbiology and infectious diseases. Every issue is thematic. Deadlines for manuscript submission are announced in advance. The number of publications on topics in spite of the issue topic is limited. The journal accepts only original articles submitted by their authors, including articles that present methods and techniques, clinical cases and opinions. Authors must guarantee that their work has not been previously published elsewhere in whole or in part and in other languages and is not under consideration by another scientific journal. The journal publishes only one review per issue; the review is ordered by the editors.