Covariance patterns between ramus morphology and the rest of the face: A geometric morphometric study

• 영문명: Covariance patterns between ramus morphology and the rest of the face: A geometric morphometric study
• 발행기관: 대한치과교정학회
• 저자명: Marietta Krüsi Demetrios J. Halazonetis Theodore Eliades Vasiliki Koretsi
• 간행물 정보: 『The Korean Journal of Orthodontics』제53권 제3호, 185~193쪽, 전체 9쪽
• 주제분류: 의약학 > 기타의약학
• 파일형태: PDF
• 발행일자: 2023.05.31

영문 초록

Objective: The growth and development of the mandible strongly depend on modeling changes occurring at its ramus. Here, we investigated covariance patterns between the morphology of the ramus and the rest of the face. Methods: Lateral cephalograms of 159 adults (55 males and 104 females) with no history of orthodontic treatment were collected. Geometric morphometrics with sliding semi-landmarks was used. The covariance between the ramus and face was investigated using a two-block partial least squares analysis (PLS). Sexual dimorphism and allometry were also assessed. Results: Differences in the divergence of the face and anteroposterior relationship of the jaws accounted for 24.1% and 21.6% of shape variation in the sample, respectively. Shape variation was greater in the sagittal plane for males than for females (30.7% vs. 17.4%), whereas variation in the vertical plane was similar for both sexes (23.7% for males and 25.4% for females). Size-related allometric differences between the sexes accounted for the shape variation to a maximum of 6% regarding the face. Regarding the covariation between the shapes of the ramus and the rest of the face, wider and shorter rami were associated with a decreased lower anterior facial height as well as a prognathic mandible and maxilla (PLS 1, 45.5% of the covariance). Additionally, a more posteriorly inclined ramus in the lower region was correlated with a Class II pattern and flat mandibular plane. Conclusions: The width, height, and inclination of the ramus were correlated with facial shape changes in the vertical and sagittal planes.

목차

INTRODUCTION

MATERIALS AND METHODS

RESULTS

DISCUSSION

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AUTHOR CONTRIBUTIONS

CONFLICTS OF INTEREST

FUNDING

SUPPLEMENTARY MATERIAL

REFERENCES

키워드

Mandibular ramus Face Morphometrics Covariance