Validity of demirjian methods for dental age estimation for a sample of Yemeni children

 Husam. A.Al-Eryani Ghamdan Alharazi Naela M ALMogahed

Orthodontic, pedodontic and prevention department faculty of dentistry university of Sana'a, Yemen

Introduction:

Children with the same chronological age may show differences in the developmental stages of different biological systems. Several indices have been developed to determine the developmental stage of a child for a certain biological system, namely indices for sexual maturity, somatic maturity, skeletal age, and dental age. In the literature, a strong correlation was found between skeletal age and sexual and somatic maturity (1) With reference to dental age, low correlations have been found with skeletal age, sexual and somatic maturity(2,3). Dental age assessment has an important role in forensic medicine, pediatric dentistry and orthodontic treatment planning (4). Orthodontics use such knowledge to predict the timing of particular treatment and pediatricians may be interested in knowing whether the dental maturity of a child with a certain disease has been delayed or advanced (5-7). Filipsson and Hall (8) showed that skeletal age correlated strongly with dental age. However, as those example, a root is one-quarter or one-third of its length, if the definitive length of the root is not known (14). Demirjian based a dental age scoring system on objective

authors did not use partial correlation, this result is limited. The low correlations show that dental age is an independent measurement for biological age and should be measured separately. Be able to measure dental age directly is important because it is a useful tool to estimate the chronological age of a child with an unknown birth date (9). Several methods have been described to determine dental age. One of these uses the ‘time of eruption’ as a parameter..The time of eruption is described as the moment the tooth pierces the gingival/ keratinized mucosa (10).This is actually the ‘time of emergence’. A disadvantage of this method is that the exact time of emergence is hard to determine. Premature loss or extraction of primary teeth can influence the time of emergence of permanent teeth(1) Methods using measurements on radiographs as a basis for the determination of dental development use the length of the tooth, crown or root as an indicator of dental age (11, 12, 13). Although some of the methods show good validity, it might be difficult to determine whether, for example, a root is one-quarter or one-third of its length, if the definitive length of the root is not known (14). Demirjian based a dental age scoring system on objective criteria and relative values rather than on absolute lengths (15,1). Radiographs of 21 328 French–Canadian children, ranging from 2 to 20 years of age, were used for.

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