Objectives: To examine (1) the laterality of asymmetry in movements of the right and left corners of the mouth in space during voluntary smile and (2) the laterality of asymmetry in relation to the difference between the right and left hemiface size and the handedness.
Materials And Methods: Participants were 155 volunteer Japanese female adults. They were categorized into the symmetric group (n = 120) and the right-side hemiface dominant group (n = 26) according to the hemiface size. In addition, the symmetric group was categorized into the right-handed group (n = 98) and the left-handed group (n = 22) according to the Edinburgh Handedness Inventory. Position vectors of the right and left corners of the mouth were obtained from the three-dimensional facial images for the rest, the maximal lip corner retraction, and the portrait smile. The displacements of the right and left corners of the mouth for each expression and the proportions of the subjects with the right- and left-sided laterality were compared.
Results: The left corner of the mouth showed significantly greater displacement (P < .01) than the right in the symmetric group for the portrait smile. The left-sided laterality was found regardless of the handedness.
Conclusions: Displacements of the right and left corners of the mouth during voluntary smile were asymmetric, and the left-sided laterality was found. Also, the laterality of the facedness differed in relation to the hemiface size, but was not related to the handedness.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8973225 | PMC |
| http://dx.doi.org/10.2319/021809-104.1 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Three-dimensional analysis of lip and chin movements during mastication with artificial nasal obstruction.
Arch Oral Biol
January 2025
Department of Pediatric Dentistry, Kagoshima University Graduate School of Medical and Dental Sciences, 8-35-1 Sakuragaoka, Kagoshima 890-8544, Japan. Electronic address:
Objective: This study aimed to investigate the effects of nasal obstruction on the coordinated movement of perioral tissues during mastication using a motion capture system.
Design: Twelve healthy adult participants were instructed to chew gum only on their habitual masticatory side for 30 s, with and without nasal obstruction. Nasal obstruction was induced by blocking nasal breathing with a nose clip.
Nasolabial flap with mucous membrane for repairing extensive lower lip tissue defect: A case report.
J Craniomaxillofac Surg
January 2025
The Department of Oral and Maxillofacial Surgery, Hospital of Stomatology, Jilin University, Changchun, China. Electronic address:
The structural integrity of the lips is essential for both aesthetic appeal and oral functionality. Defects in this region, which may arise from a variety of causes, can significantly affect a patient's physical and psychological well-being. This case report introduces a novel surgical technique designed for the repair of substantial defects in the lower lip.
View Article and Find Full Text PDFModified Lateral Surgical Approach to the Pterygopalatine Fossa for Safe Preservation of the Peripheral Branch of the Marginal Mandibular Nerve.
J Craniofac Surg
November 2024
Department of Physical Functions, Division of Oral and Maxillofacial Surgery, Kyushu Dental University.
In cases where oral cancer spreads toward the maxillary tubercle, surgery may extend to the pterygopalatine fossa. There are 2 main extraoral approaches: anterior and lateral. Previously, we introduced a modified lateral approach with a mouth corner incision from the lower lip, that preserves the mental and marginal mandibular nerves.
View Article and Find Full Text PDFThe Correlation Between Progressive Hemifacial Atrophy and Mandibular Hyaluronic Acid Injection: A Case Report.
J Craniofac Surg
January 2025
Department of Cosmetic Injection Center, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College.
Hyaluronic acid filler treatment is increasingly prevalent in the realm of plastic surgery, serving to correct a range of facial changes resulting from aging. Nevertheless, with its expanded application, an uptick in complications has been observed. This article reported a 30-year-old female patient who received chin hyaluronic acid filler treatment 5 years ago started experiencing atrophy and progressive deterioration at the injection site a year ago.
View Article and Find Full Text PDFFacial signals shape predictions about the nature of upcoming conversational responses.
Sci Rep
January 2025
Donders Institute for Brain, Cognition and Behaviour, Radboud University, Wundtlaan 1, 6525 XD Nijmegen, Nijmegen, The Netherlands.
Increasing evidence suggests that interlocutors use visual communicative signals to form predictions about unfolding utterances, but there is little data on the predictive potential of facial signals in conversation. In an online experiment with virtual agents, we examine whether facial signals produced by an addressee may allow speakers to anticipate the response to a question before it is given. Participants (n = 80) viewed videos of short conversation fragments between two virtual humans.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!