Regression models of linear dimensions of the dental arches depending on the features of cephalometric indicators according to the Schwarz A. M. method and computed tomographic dimensions of teeth in young men and young women with normal occlusion and type 1 face according to Schwarz

An individualized approach in orthodontics is the key to the successful formation of a beautiful and harmonious smile. At the same time, such an approach requires precise consideration of both the patient’s craniofacial features and the morphometric characteristics of individual teeth. In such cases, the use of averaged standards is unacceptable, since they often do not correspond to the patient’s age, sex, and population. Taking this into account, the study of the population of Ukrainian young people with physiological occlusion and a certain facial type is important, as it will allow the foundation for Ukrainian orthodontics to be formed. The aim of the study was to construct and analyze regression models of linear dimensions of the dental arches in Ukrainian young men and young women with normal occlusion and type 1 face according to Schwarz, depending on cephalometric indicators according to the Schwarz A. M. method and computed tomographic (CT) dimensions of teeth. In 12 Ukrainian young men and 20 young women with normal occlusion and type 1 face according to Schwarz, cephalometric craniometric, gnathometric and soft tissue profile indicators according to the Schwarz A. M. method were measured, as well as CT dimensions of teeth of the upper and lower jaws and linear parameters required for constructing the correct form of the dental arches. Regression models of linear dimensions of the dental arches depending on the features of cephalometric indicators and CT dimensions of teeth were constructed using the licensed Statistica 6.0 package. It was established that, both in young men and in young women with normal occlusion and type 1 face according to Schwarz, all 18 possible reliable (p<0.001) highly informative models were constructed (in young men R2= from 0.951 to 0.995; in young women R2= from 0.801 to 0.960). Analysis of the frequency of inclusion of CT tooth dimensions and cephalometric indicators according to the Schwarz A. M. method in the regression equations showed that, in young men with type 1 face according to Schwarz, cephalometric indicators and the width of the crown part of the tooth in the mesio-distal and vestibulo-oral planes are most frequently included in the models; whereas in young women with type 1 face according to Schwarz, cephalometric indicators and the width and length of the crown part of the tooth in the mesio-distal plane are most frequently included. Analysis of the frequency of inclusion of the corresponding teeth in the regression equations showed that, in young men with type 1 face according to Schwarz, the upper central incisors, upper and lower lateral incisors, and upper and lower canines are most frequently included; whereas in young women with type 1 face according to Schwarz, the upper and lower central incisors and lower canines are most frequently included.