Sazonova O. Individual anatomical variability of visceral skull in adulthood

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0419U001648

Applicant for

Specialization

  • 14.03.01 - Нормальна анатомія

23-10-2019

Specialized Academic Board

Д 64.600.03

Essay

The dissertation presents theoretical substantiation and establishment of individual anatomical variability for relations of the visceral bone structures of the human skull in adulthood. For the first time, determined the range of individual variability of the structure of the skull depending on extreme forms, in brachycephalic, mesocephalic and dolichocephalic. Although, it was determined the morphological features and craniometrical relations of the shape, size and structures of the visceral skull, its upper and lower parts with the qualifying characteristic of dentoalveolar apparatus. For the first time, determined the range of variability values underlying cephalic index that allowed systematizing the diversity of forms and ratios of the cerebral and visceral skull during this age. This is confirmed by the performance of variation and statistical analysis of each linear size of the skull and referred to the main index, proposed and implemalested by academician Shevkunenko V. The author had been analyzed and compared the required lateral or latitudinal parameters of the visceral skull in adulthood people. In analyzing the data, an adulthood people were determined with a roundshape oval of visceral skull, related with the brachycephalic structure of the head; intermediate ovality - for mesocephalic type and narrowed ovality - for dolichocephalic type. For the first time, determined the longitudinal variability parameters of the visceral skull, which is typical for males and females in adulthood. This greatly complements our understanding of the structure and shape of the skull among the people who live in our geographic area. Investigated parameters reflect the existing individual variability of the gradual lengthening and narrowing of the upper part of the visceral skull, which is typical for members of dolichocephalic shape of the head. On the contrary, this parameter of the visceral skull greater in brachycephalic people due to the increased convexity of the two halves of the body of the maxilla, the curvature of the upper alveolar arch and forward movement of point prostion (pr). Calculated Ind1 and Ind2 revealed that males and females of the age 25-60 who have brachycephalic shape of the skull, the most common type is determined in evriprozopic type of visceral skull with a distinctive increase in all parameters and less - the mesoprozopic type with average values of the parameters. Otherwise, broad-headed people with a wide or moderate form of visceral skull, depending on the determined morphometric parameters and range of their variability. People with mesocephalic skull in this age period often appears to have the mesoprozopic type of visceral skull with the average measures, thereby moderate size of head. In this age people with dolichocephalic shape of the skull, the most common type of visceral skull is leptoprozopic with characteristic longitudinal prevalence parameters. Less often, it exists a mezoprozopic type of visceral skull with a set of average performance. By the other words, people with a narrow head were determined by a combination of constricted or medium form of the visceral skull, which fully confirmed by variation-derived statistics. In addition, it was found that brachycephalic adulthood is 58 %, mesocephalic - 31 % and dolichocephalic - 11 %. Accordingly, the largest group consists of males with an evriprozopic and mesoprozopic types of visceral skull, the smallest - leptoprozopic type. During comparative analyses of the visceral angles, author has formulated the conclusion that in people with brachycephalic (wide head) more common the mezognathic type of visceral skull, but the individuals with prognathic, ortognathic structures of visceral skull is allowed. Males and females with the mesocephalic type (moderate head) are usually obtained with the ortognathic and less mezognathic types of visceral skull, as shown by the investigated angle parameters. The representatives with dolichocephalic (narrow head) are determined with the prevalence of ortognathic type of visceral skull structure. For the first time, it was found that zygomatic angle in adulthood people with the brachycephalic type is more open by the predominance of transverse dimensions (width) of the visceral skull and in the representatives of dolichocephalic skull shape given a closed angle, approaching to the straight. This is due to the increased longitudinal set of parameters in full skull and its visceral regions. According to the data, the mandibular angle of the visceral skull gradually decreases from the broad-headed people to moderate- and long-headed. However, people with dolichocephalic type were determined by a slight decrease of this angle, due to the uniformity of location of the horizontal and vertical branches of the mandible, regardless of the extreme forms of the structure of the skull. In addition, it was found that that angle has a range of individual variability from 60 to 85° in adulthood people. Based on the visceral skull craniometrical, was determined the individual variability in transverse-zygomatic and frontal-zygomatic indices. In addition, for the first it was found the existing range of individual anatomical variability of shape, size and position of the upper alveolar arch and the upper row of teeth in reproductive adulthood people. In our study, for the first time given a range of craniometrical characteristic of the individual variability of the mandible in adulthood people considering the gender.

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