Dental maturity in Finns and the problem of missing teeth

Abstract

Development of teeth was studied from 2483 dental panoramic tomograms of 1651 healthy Finns ranging in age from 2 to 25 years. Dental maturity was assessed using a method based on developmental stages of 7 left mandibular teeth. We give sex-specific tables of maturity scores as a function of ages and of ages as a function of maturity scores. Also generated are percentile graphs for visual evaluations of dental maturity in children and adolescents. Since maturity scales do not tolerate any missing data, a great limitation for their use, we have developed linear regression models for predicting the formation stages of each of the 7 mandibular teeth. It was easiest to predict the formation stage of the mandibular first molars (correct in 87% within the study material) and most difficult to predict second molars and second premolars (correct in 69% and 70%, respectively). We expect the data and formulae presented in this study to prove useful in research and in clinical and forensic dentistry.

Assessment of dental maturity of western Chinese children using Demirjian's method

“…Several methods for estimating the dental age according to the degree of calcification of teeth from radiographs have been described [5][6][7][8][9][10][11][12][13][14][15][16]. Most of these were based on dental calcification stages, which were coded according to previously determined scores compiled from a large number of samples, usually in a well-defined geographic region.…”

“…However, the existence of different patterns of dental maturation among different populations has been reported. Several authors found that the results were less accurate when the development standards used by Demirjian were tested in different populations [5,6,[8][9][10][11][12][13][14][16][17][18][19][20][21]. Willems et al [6] found that Demirjian's method resulted in a significant overestimation of the dental age for Belgian Caucasian sample, amounting to a median of 0.5 years for boys and a median of 0.6 years for girls.…”

Long-term adverse effects on dentition in children with poor-risk neuroblastoma treated with high-dose chemotherapy and autologous stem cell transplantation with or without total body irradiation

“…28 To get the best information available, adolescents with mature dentition were chosen because the DeI reaches its final (maximum) value only in adolescence after the roots have completed their development.…”

Estimación de Edad Dentaria Utilizando el Método de Demirjian en Niños de 5 a 15 Años de Curicó, Chile

“…Se han realizado numerosos estudios en diferentes grupos étnicos, analizán-dose niños europeos, asiáticos y sudamericanos, entre otros. Se ha sugerido que puede haber diferentes patrones de maduración dental entre las distintas poblaciones, no sólo entre grupos poblacionales alrededor de todo el mundo, sino también entre individuos de diferentes ciudades o áreas geográficas dentro del mismo país (Cruz-Landeira et al, 2010;Eid et al, 2002;Lee et al, 2008;Liversidge et al, 1999;Moananui et al, 2008;Nyström et al, 2000;Nyström et al, 1988;Flores, et al, 2010;Teivens & Mörnstad, 2001). …”

“…Edad Cronológica versus Edad Dentaria para niños y niñas. 457 Maia et al, 2010;McKenna et al, 2002;Mitchell et al, 2009;Nadler, 1998;Nyström et al, 2000;Tunc & Koyuturk, 2008;Uysal et al, 2004), obteniendo en general una sobreestimación de la edad dentaria. …”