Open AccessPECULIARITIES OF DETERMINING INDIVIDUAL AND SEXUAL VARIABILITY OF THIRD MOLARS IN PEOPLE OF THE FIRST PERIOD OF MATURITY
Author(s) -
R. V. Talash
Publication year - 2019
Publication title -
aktualʹnì problemi sučasnoï medicini: vìsnik ukraïnsʹkoï medičnoï stomatologìčnoï akademì
Language(s) - English
Resource type - Journals
eISSN - 2077-1126
pISSN - 2077-1096
DOI - 10.31718/2077-1096.19.4.69
Subject(s) - molar , crown (dentistry) , root (linguistics) , dentition , dentistry , orthodontics , biology , medicine , philosophy , linguistics
The article presents a theoretical synthesis and a new solution of the scientific problem, which consists in determining the sexual and individual polymorphism of third molars through the age aspect. The review of the relevant literature, the results obtained by analysing orthopantograms of people at the first period of adulthood, and studying randomly selected third molars removed for various clinical reasons (more than 140 samples) are presented. It has been shown that erupted third molars considerably vary in size and shape that is due to different combinations of configurational relationship between the crown and root parts. This depends on the location of opposing teeth in the dentition and sex as well, but does not correlate with age. Moreover, the entire range of individual and sexual variability of the third molars is limited by two extreme forms: very large teeth with long divided roots or with a quadratubercular crown, which are not significantly different from typical molars, and very small analogues with one fused root section, the crowns of which resemble small permanent teeth. Between these forms all other are distributed and most numerous types we called as intermediate. The data analyzed indicate that the individual variability of the size of the teeth in length depends entirely on the length of their root sections. It has been established that, relative to the crown-root index, there are three forms distinguished among the third molars: long-root; medium root and short root. At the same time, long-root forms are found mainly among male teeth, mid-root forms are more characteristic of female wisdom teeth, and short-root forms of third molars do not show a sex difference. The results obtained demonstrate that the orthopantogram of the dentofacial system in humans (aged 22 to 35 years) reliably reveals an inverse relationship between the longitudinal size and the term of eruption of the third molars. The systematic approach used in the work made it possible to bring the varied polymorphism of the third molars into a certain order, highlighting the most indicative features for their classification.