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Third molar development: measurements versus scores as age predictor.
P W Thevissen1, S Fieuws, G Willems
1Katholieke Universiteit Leuven, Faculty of Medicine, School of Dentistry, Forensic Odontology Department, Kapucijnenvoer 7, Leuven B-3000, Belgium. denthepa@telenet.be
Archives of Oral Biology
|May 10, 2011
Summary
Third molar development stages are more accurate for predicting age in individuals than tooth measurements. This study found that using dental development stages provides the best results for chronological age estimation.
Area of Science:
- Forensic Anthropology
- Dental Age Estimation
- Human Growth and Development
Background:
- Human third molar (wisdom tooth) development is a key indicator for estimating chronological age in sub-adults with uncertain ages.
- Current methods rely on radiological staging and scoring of third molar growth and maturation.
- Alternative methods involving measurements of developing wisdom teeth and adjacent molars have been explored.
Purpose of the Study:
- To investigate the relationship between mandibular third molar developmental stages and measurements with chronological age.
- To compare the age prediction accuracy of third molar stages versus molar measurements and ratios.
- To determine if molar measurements provide additional predictive information beyond developmental stages.
Main Methods:
- Analysis of 340 orthopantomograms (170 males, 170 females) aged 7–24 years.
- Staging of mandibular third molars using the Gleiser and Hunt method.
- Measurement of length and width of mandibular second and third molars, and calculation of ratios.
- Application of univariable and multivariable regression models to assess age prediction performance.
Main Results:
- The univariable regression model using third molar developmental stages yielded the most accurate age predictions (males: R(2) 0.85; females: R(2) 0.77).
- Multivariable models showed that measurements and ratios of mandibular molars did not add clinically relevant information to age prediction based on developmental stages.
- Developmental stages of third molars are superior predictors of age compared to molar measurements and ratios.
Conclusions:
- Mandibular third molar developmental staging is a reliable and accurate method for chronological age estimation in individuals aged 7–24 years.
- Dental measurements and ratios of second and third molars offer less accurate age predictions compared to third molar developmental stages.
- The findings support the continued use of third molar development staging as the primary radiological method for forensic age assessment.
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