The study of three-dimensional smile changes on orofacial morphology

IF 3.4 3区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Journal of Dental Sciences Pub Date : 2025-01-30 DOI:10.1016/j.jds.2025.01.010

Johnson Hsin-Chung Cheng , Yu-Chien Hsu , Od Bayarsaikhan

{"title":"The study of three-dimensional smile changes on orofacial morphology","authors":"Johnson Hsin-Chung Cheng , Yu-Chien Hsu , Od Bayarsaikhan","doi":"10.1016/j.jds.2025.01.010","DOIUrl":null,"url":null,"abstract":"<div><h3>Background/purpose</h3><div>Traditionally, two-dimensional (2D) frontal and lateral facial views have provided an incomplete understand true three-dimensional (3D) relationships. This study aimed to investigate the 3D changes in orofacial soft tissues during smiling and to examine the influence of craniofacial and dental morphology on these changes.</div></div><div><h3>Materials and methods</h3><div>131 individuals aged 18–30 with attractive facial features were recruited. Rest and posed smile 3D facial photos captured by 3D camera and cone-beam computed tomography (CBCT) scans were taken. Data were recorded and analyzed in rest, smile images, and smiling change measurements, including 23 landmarks, 11 linear, and 6 angular measurements. Statistical methods were used to analyze the frequency distribution, the significant difference between rest and smile variables, and the relationship between craniofaciodental tissue and 3D smile changes.</div></div><div><h3>Results</h3><div>The study involved 65 males (mean age 23.5 ± 3.2 years) and 66 females (mean age 22.5 ± 1.5 years). The soft tissue landmarks changed during smiling reveals that 21 landmarks in z-plane, 22 landmarks in y-plane, and 15 landmarks in x-plane landmarks showed significant differences. In addition, a significant correlation was noted between upper lip length (sn-uli) (r = 0.46, <em>P</em> = 0.057), lower lip length (lls-SB) (r = 0.44, <em>P</em> = 0.022), and the hard tissue measurement Id-Me.</div></div><div><h3>Conclusion</h3><div>The significant 3D change of soft tissue landmarks during smiling occurs mostly in z and y-plane, rather than x-plane. Clinically, all dimensions should be considered in orthodontic diagnosis and treatment planning, especially in the z plane the change cannot be seen in the traditional 2D analysis.</div></div>","PeriodicalId":15583,"journal":{"name":"Journal of Dental Sciences","volume":"20 2","pages":"Pages 1148-1157"},"PeriodicalIF":3.4000,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Dental Sciences","FirstCategoryId":"3","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1991790225000108","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}

引用次数: 0

Abstract

Background/purpose

Traditionally, two-dimensional (2D) frontal and lateral facial views have provided an incomplete understand true three-dimensional (3D) relationships. This study aimed to investigate the 3D changes in orofacial soft tissues during smiling and to examine the influence of craniofacial and dental morphology on these changes.

Materials and methods

131 individuals aged 18–30 with attractive facial features were recruited. Rest and posed smile 3D facial photos captured by 3D camera and cone-beam computed tomography (CBCT) scans were taken. Data were recorded and analyzed in rest, smile images, and smiling change measurements, including 23 landmarks, 11 linear, and 6 angular measurements. Statistical methods were used to analyze the frequency distribution, the significant difference between rest and smile variables, and the relationship between craniofaciodental tissue and 3D smile changes.

Results

The study involved 65 males (mean age 23.5 ± 3.2 years) and 66 females (mean age 22.5 ± 1.5 years). The soft tissue landmarks changed during smiling reveals that 21 landmarks in z-plane, 22 landmarks in y-plane, and 15 landmarks in x-plane landmarks showed significant differences. In addition, a significant correlation was noted between upper lip length (sn-uli) (r = 0.46, P = 0.057), lower lip length (lls-SB) (r = 0.44, P = 0.022), and the hard tissue measurement Id-Me.

Conclusion

The significant 3D change of soft tissue landmarks during smiling occurs mostly in z and y-plane, rather than x-plane. Clinically, all dimensions should be considered in orthodontic diagnosis and treatment planning, especially in the z plane the change cannot be seen in the traditional 2D analysis.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Dental Sciences 医学-牙科与口腔外科

CiteScore

5.10

自引率

14.30%

发文量

348

审稿时长

6 days

期刊介绍： he Journal of Dental Sciences (JDS), published quarterly, is the official and open access publication of the Association for Dental Sciences of the Republic of China (ADS-ROC). The precedent journal of the JDS is the Chinese Dental Journal (CDJ) which had already been covered by MEDLINE in 1988. As the CDJ continued to prove its importance in the region, the ADS-ROC decided to move to the international community by publishing an English journal. Hence, the birth of the JDS in 2006. The JDS is indexed in the SCI Expanded since 2008. It is also indexed in Scopus, and EMCare, ScienceDirect, SIIC Data Bases. The topics covered by the JDS include all fields of basic and clinical dentistry. Some manuscripts focusing on the study of certain endemic diseases such as dental caries and periodontal diseases in particular regions of any country as well as oral pre-cancers, oral cancers, and oral submucous fibrosis related to betel nut chewing habit are also considered for publication. Besides, the JDS also publishes articles about the efficacy of a new treatment modality on oral verrucous hyperplasia or early oral squamous cell carcinoma.