Abstract
Objective: One of the techniques of estimating age in forensic medicine, which is associated with the least trauma in both living individuals and corpses, is to use teeth. Accordingly, the present study aims to determine the relationship between chronological age and pulp-to-tooth area ratio and pulp-to-root width ratio in maxillary and mandibular canines on panoramic radiographs among the Iranian population. Material and Methods: A total of 162 panoramic radiographs were evaluated in the present study. Selected patients were of verified age with the age range of 15-45 years. The pulp-to-tooth area ratio (PTR) and the pulp-to-root width ratio were calculated with AutoCAD 2016 software program in maxillary and mandibular canines at two points of the root. The two points include cemento-enamel Junction (CEJ) and pulp/root width at the quarter of a distance between CEJ and end point of root-canal, which was named WA, WB respectively. The patients’ age was also estimated with the use of linear regression equation. Then each patient’s chronological age and the age estimated using this technique was compared. Results: The relationship between PTR in both canines and WB variable in maxilla with chronological age was inverse and significant (P < 0.05); However, there was no strong correlation coefficient (r Gender had no effect on the results of the study. The mean difference between predicted age and actual age with combined PTR and WB formula was lower than 1 year. When the mean of PTR or WB variables was considered as a predictor, significant results were obtained (P < 0.05), showing a decrease in Standard error of estimation (SEE). The results were not significant when variables of upper PTR and lower PTR and the interaction between them were included in the linear regression model (p > 0.05). Same results were obtained with the variable of WB. Conclusion: Combining the variables of PTR and WB gives better results than using variables alone. Estimation of age with the mean of each variable shows less error than their combination. Keywords Age determination; Canine; Panoramic radiography.
Highlights
Estimation of an individual’s age during his/ her life is an important issue in forensic medicine
The first effective method for estimating age in corpses using teeth was introduced by Gustafson in 1950, which consisted of determination of the amount of secondary dentin [4]. some of the different techniques used for the estimation of age using teeth are the use of tooth structure, observation of tooth collagen, Lamendin technique, and etc., which have some limitations [5]
This study aims to estimate chronological age with pulp-to-tooth area ratio and width ratios of upper and lower canines on panoramic radiographs among Iranian population
Summary
Estimation of an individual’s age during his/ her life is an important issue in forensic medicine. Teeth have the hardest structure in the human body and are the most resistant parts to the use of medications, endocrine diseases and chemical and thermal changes, making them an ideal tissue for the estimation of age in both living individuals and corpses [3]. Some of the different techniques used for the estimation of age using teeth are the use of tooth structure, observation of tooth collagen, Lamendin technique, and etc., which have some limitations [5]. Some of these limitations are the complexity and the potential to destroy tooth structure and the need for extraction of teeth, making them unpractical in living individuals [6]
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