Journal of Isfahan Dental School

Evaluation of Morphological Patterns of Lip Prints in the Population of Students at Isfahan Azad University

Document Type : مقاله‌های پژوهشی

Authors

1 Dental Student, School of Dentistry, Islamic Azad University of Isfahan (Khorasgan), Isfahan, Iran

2 Professor, Community Health Research Center, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran

3 Assistant Professor, Department of Mathematics, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran

4 Assistant Professor, Department of Oral and Maxillofacial surgery, school of dentistry, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran

5 MSc, Community Health Research Center, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran

Abstract

Introduction: Lip lines in individuals are unique and stable with age and can be used for sex estimation in forensic dentistry. This study aims to evaluate lip lines in people and investigate the possibility of sex estimation through lip lines.
Material and methods: In this descriptive-analytical study, 100 people including 57 females and 43 males from Isfahan Islamic Azad University participated in May 2017. By using Nuba brand red lipstick, number 405, made in Iran, on 50 mm adhesive tape and pasting it on white paper, a lip effect was prepared. Each lip was divided into four parts, and the lip grooves were recorded independently by two observers using a camera lens. Suzuki and Tsuchihashi’s classification methods were used to define lip patterns. Data analysis was performed using Chi-2 Pearson, Fisher's exact, Kolmogorov Smirnov, and independent t-tests (α = 0.05).
Results: Our study showed that there was no similarity in people's lip lines. The highest frequency was pattern type e (31%) and then type a (30%), type c (21%), type d (8%), type b (6%), and type f (4%) respectively. In dividing the lip into four areas, there was a significant difference between females and males in the left upper lip area (p value = 0.004), pattern e in males and pattern c in females were the most frequent. Also, there was no significant difference between females and males in terms of lip height and lip elongation.
 Conclusion: Lip lines are unique and can be used in sex estimation. In the left upper lip area, pattern e is more common in males, and pattern c is more common in females.
Keywords: Forensic dentistry; Papulation forecast; Lip; Morphological

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Journal of Isfahan Dental School
Volume 20, Issue 1 - Serial Number 1
May 2024
Pages 25-32