Interlabial gap and freeway space at rest position: a cephalometric study

IF 0.5 4区医学 Q4 DENTISTRY, ORAL SURGERY & MEDICINE

Australasian Orthodontic Journal Pub Date : 2021-07-01 DOI:10.21307/aoj-2021.027

Ye-Ji Seo, Jae Hyun Park, Na-Young Chang, Hye Young Seo, J. Chae

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引用次数: 1

Abstract

Abstract Objectives The aim of this prospective study was to assess the amount of interlabial gap (ILG) and freeway space (FWS) at rest position (RP) according to gender, age, and skeletal pattern, and to evaluate the cephalometric measurements at maximum intercuspal position (MIP) and at RP to define the cephalometric changes from MIP to RP related to the amount of ILG and FWS. Methods Lateral cephalograms and photographs of selected subjects (47 females, 57 males) were obtained at MIP and RP. Cephalometric measurements at MIP and RP and their differences were measured and compared. Results ILG (P > 0.05) and FWS (P < 0.01) were greater in males than in females. ILG (P < 0.05) and FWS (P > 0.05) were greater in adolescents than in adults. ILG and FWS were not significantly related with the vertical skeletal pattern (FHR, facial height ratio). ILG was the greatest in Class II cases but without significance. FWS was significantly greater in Class III than in Class I and Class II cases (P < 0.05). At MIP, the ILG at RP increased as overjet (P < 0.05) and upper lip to the aesthetic line (P < 0.01) increased. At RP, the ILG increased as upper incisor exposure and the lips to the aesthetic line increased (P < 0.001), and FWS decreased as overbite decreased (P < 0.001). From MIP to RP, lip length showed the greatest decrease (P < 0.001) in the large ILG group. Additionally, Bjork sum (the sum of the saddle, articular, and gonial angles), mandibular plane angle, anterior facial height, and ANB (P < 0.001) showed the greatest increase, while OB (P < 0.001) showed the greatest decrease in the large FWS group. The lip competent group showed the largest frequency distribution in the small ILG and FWS groups, while smile line frequency distribution showed no relationship with the level of ILG and FWS. Conclusions Taking cephalometric measurements at RP would be helpful to evaluate the ILG and FWS more accurately, and to provide a more accurate diagnosis and treatment plan.

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阴唇间隙与静止状态下高速公路空间的头影测量研究

摘要目的本前瞻性研究的目的是根据性别、年龄和骨骼模式评估静止位置（RP）的阴唇间隙（ILG）和高速公路间隙（FWS）的量，并评估最大尖间位置（MIP）和RP的头影测量，以确定与ILG和FWS量相关的从MIP到RP的头测量变化。方法对所选受试者（47名女性，57名男性）进行MIP和RP侧位头影和照片，测量并比较MIP和RP头影测量值及其差异。结果男性ILG（P＞0.05）和FWS（P＜0.01）明显高于女性。青少年ILG（P＜0.05）和FWS（P＞0.05）高于成人。ILG和FWS与垂直骨骼模式（FHR，面部高度比）无显著相关性。ILG在II类病例中最高，但无显著性。FWS在III级病例中明显高于I级和II级病例（P<0.05）。在MIP时，RP处的ILG随着覆盖层（P<0.05）和上唇至美学线（P<0.01）的增加而增加。在RP时，ILG随着上切牙暴露量的增加而增加，嘴唇与美学线的距离增加（P＜0.001），FWS随着覆牙减少而降低（P＜0.01）。从MIP到RP，大ILG组的嘴唇长度下降幅度最大（P＜001）。此外，Bjork sum（鞍角、关节角和斜角的总和）、下颌平面角、前面部高度和ANB（P<0.001）显示出最大的增加，而OB（<0.001）显示出在大FWS组中最大的减少。唇功能组在小ILG和FWS组中表现出最大的频率分布，而微笑线频率分布与ILG和FWS水平无关。结论RP头影测量有助于更准确地评估ILG和FWS，并提供更准确的诊断和治疗方案。

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

Australasian Orthodontic Journal Dentistry-Orthodontics

CiteScore

0.80

自引率

25.00%

发文量

期刊介绍： The Australasian Orthodontic Journal (AOJ) is the official scientific publication of the Australian Society of Orthodontists. Previously titled the Australian Orthodontic Journal, the name of the publication was changed in 2017 to provide the region with additional representation because of a substantial increase in the number of submitted overseas'' manuscripts. The volume and issue numbers continue in sequence and only the ISSN numbers have been updated. The AOJ publishes original research papers, clinical reports, book reviews, abstracts from other journals, and other material which is of interest to orthodontists and is in the interest of their continuing education. It is published twice a year in November and May. The AOJ is indexed and abstracted by Science Citation Index Expanded (SciSearch) and Journal Citation Reports/Science Edition.