A new model of classification of third molars development and its correlation with chronological age in a Brazilian subpopulation.

Autor: Gaêta-Araujo H; Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas (UNICAMP), P.O. BOX 52, Piracicaba, SP, 13414-903, Brazil. hugogaeta@hotmail.com., Oliveira-Santos N; Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas (UNICAMP), P.O. BOX 52, Piracicaba, SP, 13414-903, Brazil., Nascimento EHL; Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas (UNICAMP), P.O. BOX 52, Piracicaba, SP, 13414-903, Brazil.; Department of Clinical and Preventive Dentistry, Federal University of Pernambuco (UFPE), Recife, PE, Brazil., Nogueira-Reis F; Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas (UNICAMP), P.O. BOX 52, Piracicaba, SP, 13414-903, Brazil., Oenning AC; Division of Oral Radiology, Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic, Campinas, SP, Brazil., Groppo FC; Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas (UNICAMP), P.O. BOX 52, Piracicaba, SP, 13414-903, Brazil.; Department of Physiological Sciences, Piracicaba Dental School, University of Campinas (UNICAMP), Piracicaba, SP, Brazil., Oliveira-Santos C; Department of Stomatology, Public Oral Health and Forensic Dentistry, Division of Oral Radiology, School of Dentistry of Ribeirao Preto, University of Sao Paulo (USP), Ribeirao Preto, SP, Brazil.
Jazyk: angličtina
Zdroj: International journal of legal medicine [Int J Legal Med] 2021 Mar; Vol. 135 (2), pp. 639-648. Date of Electronic Publication: 2020 Aug 25.
DOI: 10.1007/s00414-020-02401-1
Abstrakt: The present study correlated the mineralization of third molars to chronological age using a modified classification based on Demirjian's stages in a Brazilian subpopulation and compared with the original classification. A total of 1082 patients with age ranging from 6 to 26 years were included in the sample, with at least one third molar on panoramic radiographs. The third molars were classified according to the original Demirjian classification (8 stages) and a new model based on the Demirjian method, where the original stages were grouped into four stages: AB-enamel mineralization; CD-crown dentin mineralization; EFG-root formation; and H-complete development. Statistical analyses were performed by Kruskal-Wallis/Dunn tests (α = 0.05) and the multinomial logistic regression model. Data were analyzed according to percentiles for the probability of an individual being over 18 years old. The mean ages of the stages in both classifications did not present a significant difference between superior and inferior arches (p < 0.05). The differences in mean ages between all the stages of mineralization were statistically significant (p < 0.001) only for the 4-stage classification. Males attained root formation and complete formation earlier than females (p < 0.05) in the 4-stage classification. The modified classification system showed dependence between chronological age and mineralization stages of third molars, simplifying the age estimation process. At stage H, females present a 95.7% chance of being over 18, while for males, this probability is 89.6%. This modified classification system simplifies the dental age estimation process based on third molars and can be used as a reference for future studies.
Databáze: MEDLINE
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