Accuracy of an equation for estimating age from mandibular third molar development in a Thai population
Verochana Karune, Prapayasatok Sangsom, Janhom Apirum, Mahasantipiya Phattaranant May, Korwanich Narumanas,
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( Verochana Karune ) - Chiang Mai University Faculty of Dentistry Division of Oral and Maxillofacial Radiology
( Prapayasatok Sangsom ) - Chiang Mai University Faculty of Dentistry Division of Oral and Maxillofacial Radiology
( Janhom Apirum ) - Chiang Mai University Faculty of Dentistry Division of Oral and Maxillofacial Radiology
( Mahasantipiya Phattaranant May ) - Chiang Mai University Faculty of Dentistry Division of Oral and Maxillofacial Radiology
( Korwanich Narumanas ) - Chiang Mai University Faculty of Dentistry Division of Community Dentistry
Abstract
Purpose: This study assessed the accuracy of age estimates produced by a regression equation derived from lower third molar development in a Thai population.
Materials and Methods: The first part of this study relied on measurements taken from panoramic radiographs of 614 Thai patients aged from 9 to 20. The stage of lower left and right third molar development was observed in each radiograph and a modified Gat score was assigned. Linear regression on this data produced the following equation: Y=9.309+1.673 mG+0.303S (Y=age; mG=modified Gat score; S=sex). In the second part of this study, the predictive accuracy of this equation was evaluated using data from a second set of panoramic radiographs (539 Thai subjects, 9 to 24 years old). Each subject’s age was estimated using the above equation and compared against age calculated from a provided date of birth. Estimated and known age data were analyzed using the Pearson correlation coefficient and descriptive statistics.
Results: Ages estimated from lower left and lower right third molar development stage were significantly correlated with the known ages (r=0.818, 0.808, respectively, P≤0.01). 50% of age estimates in the second part of the study fell within a range of error of ±1 year, while 75% fell within a range of error of ±2 years. The study found that the equation tends to estimate age accurately when individuals are 9 to 20 years of age.
Conclusion: The equation can be used for age estimation for Thai populations when the individuals are 9 to 20 years of age.
키워드
Age Determination by Teeth; Molar; Third; Radiography; Panoramic; Forensic Dentistry
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