Date of Award

Fall 2023

Document Type


Degree Name

Master of Science (MS)


Dental Hygiene


Dental Hygiene

Committee Director

Brenda T. Bradshaw

Committee Member

Ann M. Bruhn

Committee Member

Walter L. Melvin

Committee Member

Sinjini Sikdar


Problem: Lip prints are unique and have potential for use as a human identifier. The purpose of this study was to observe possible cheiloscopy differences of individuals with and without parafunctional oral habits. Additionally, inter-rater reliability (IRR) of lip print examiners was observed. Methods: This IRB approved blinded cross-sectional observational study collected lip prints from sixty-six individuals using lipstick and adhesive tape to transfer lip prints to white bond paper for viewing purposes. Each set of included lip prints was divided into quadrants and dichotomized as those with or without an oral parafunctional habit. Each quadrant sample was manually analyzed and classified according to the gold standard Suzuki and Tsuchihashi system. Two groups of examiners were provided with 50 of the lip print samples and asked to classify the middle portion of the lower lip. One group of examiners received a 15-minute training and practice session while the other did not. Results: A total of 252 dichotomized lip print quadrants (with habits n=76, 30.2%, and without habits n=176, 69.8%) were analyzed. Type II patterns were the most common for examined quadrant samples; however, no statistically significant differences (Pearson’s chi-squared test, p=0.366) were observed between pattern classifications of samples with and without parafunctional oral habits. For the IRR test, a significant difference was observed between the two groups (p


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