Morphometric analysis of relationships of basic dimensions of dental arts taking into account individual gnatic types

Abstract

Aim. Determining the relationship between the main parameters of the dental arches of the upper and lower jaw in people with physiological occlusion of permanent teeth. Materials and methods. The research materials were the results of biometric measurements of plaster models of dentition of 119 people of the first period of adulthood with a full set of permanent teeth, physiological occlusion, and various gnathic and dental types of dental arches. The gnathic variants (mesognathy, dolichognathy, brachygnathy) of the dental arches were determined taking into account the dental index calculated as the ratio of the half of the sum of the 14-tooth crowns to the width of the dental arch between the second molars. Types of the dental system (normodontia, macrodontia, microdontia) were determined by the results of the summation of the width of the crowns of the upper teeth. Results. According to the results of biometric studies, it was established that regardless of the gnathic and dental type of dental arches, the ratio of the sum of the mesial-distal sizes of 14 teeth of the upper jaw to the same parameters of the lower jaw averaged 1.065 ± 0.005. The ratio of the sum of the width of the crowns of 7 teeth of each half of the dental arch to the size of the frontal-distal diagonal was 1.065 ± 0.005 both on the upper and on the lower dental arch. The ratio of the diagonal dimensions of the upper dental arch to the same size of the lower arch was also 1.065 ± 0.01 for all types of dental arches. Conclusion. The obtained ratios, as highly informative, diagnostically significant indicators, can be used to determine the compliance of the main dimensions of the dental arches of the upper and lower jaws, to characterize the physiological occlusion, to select the size of artificial teeth in people with complete adentia, to predict the shape and size of dental arches when treatment of patients with occlusion anomalies in order to achieve an optimal functional and aesthetic result.