Pozur T. Features of the main characteristics of the dental arch of the upper and lower jaws in young men and women of different physiognomic types with orthognath-ic bite

According to the results of a research For the first time, the features of computed tomography of tooth size and the dimensions required to build the correct shape of dental arches in young women with wide and very wide facial types, with normal occlusion close to orthognathic bite. In young women with a very wide face type, compared with a wide face type, significantly (p<0.05-0.01) greater values of the distance between the apexes of the medial and distal roots of the lower first molars, the distance between the apexes of the upper canines and the width of the upper central incisors at the level of anatomical neck in the mesio-distal direction, as well as smaller values of the root length of the upper central incisors in the mesio-distal direction have been found. For the first time, found pronounced sex differences between computed tomography and tooth size, which are necessary to build the correct shape of dental arches between young men and women with a wide face type. In young men, significantly (p<0.05-0.001) greater values of most tooth sizes in the mesiodistal and vestibulo-oral directions, as well as most of the transverse and sagittal characteristics of dental arches have been found. For the first time, reliable regression models of computed tomography sizes were developed, which are used to construct the correct shape of dental arches (all 18 possible), depending on the size of teeth and cephalometric parameters in young men with a wide face and in young women with wide and very wide facial types. Both in young men and women models more often include odontometric than cephalometric models (30.3 % – 32.7 % – 27.0 % respectively) indicators. For the first time it was proved that among odontometric indicators regression models most often include: in young men with a wide face type – the width of dental crowns in the mesio-distal and vestibulo-oral direction, as well as the distance from the middle of the cutting edge to the apex of the root of the teeth in the vestibulo-oral direction; in young women with a wide type of face – the width of the crowns of the teeth, the width of the teeth at the level of the anatomical neck and the length of the root of incisors and canines in the mesio-distal direction; in young women with a very wide face type – the width of the tooth crowns and the width of the teeth at the anatomical neck in the mesio-distal direction and the width of the crowns teeth in the vestibulo-oral direction. Among the cephalometric indicators, the models most often include: young men with a wide face type – the largest head circumference and nose height (2.8 % each); in young women with a wide type of face – the height of the lower lip (4.8 %); distance from auricular point to inter-incisor point (3.8 %); young women with a very wide face type – the longest head length (3.6 %); average width of the face and height of the lower lip (2.7 % each). Based on the built regression models, a method of reproducing the correct shape of dental arches is proposed, using the computer program "DentaNorm" (author's certificate for the work № 97651), which allows not only to improve existing conservative and surgical methods of treatment of dental patients, but also to minimize the probability of diagnostic errors and complications.