Modeling of individual teleradiographic indicators according to the Steiner method for Ukrainian young men with wide and young women with a very wide and wide face types

Cephalometric methods of analysis of lateral teleradiograms are one of the key elements of orthodontic planning of treatment of a patient with pathology of the dental-jaw system. Determining normative teleradiographic indicators for the local population is a key step for the successful application of one or another method of analysis, in particular, for Ukraine. The aim of the study was to construct and analyze regression models of teleradiographic parameters used in the Steiner method for Ukrainian young men and young women with orthognathic occlusion with different face types. 49 young men and 76 young women with orthognathic occlusion in the software OnyxCeph³™, version 3DPro, the company Image Instruments GmbH, Germany (license № URSQ-1799) conducted a cephalometric study using the Steiner method. The division into facial types was performed using the Garson index. Cephalometric parameters were divided into three groups: the first – indicators used in cephalometric analyzes of Schwarz, Ricketts, Steiner, Roth-Jarabak, Burstone and Bjork and are included in the parameters that usually do not change during surgical and orthodontic treatment; the second – dental-maxillary characteristics according to the Steiner method which surgical methods can be used to change the length, width, angles and position of the jaws; third – indicators according to the Steiner method that characterize the position of each tooth relative to each other, cranial structures and the profile of the soft tissues of the face. Modeling of individual teleradiographic indicators was performed in the licensed package “Statistica 6.0” using step-by-step regression analysis. When analyzing reliable models of teleradiographic indicators according to the Steiner method, which were included in the second group depending on the indicators of the first group with a coefficient of determination higher than 0.6, it was found that out of 7 possible, 5 models were built for young men with a wide face type, which most often include the value of the distances Ar-Go and N-S and the angles H and N-S-Ar; young women with a very wide type of face – 3 models (R²=from 0.604 to 0.812) which most often include the value of the angles N-S-Ar and H; in young women with a wide type of face – 4 models (R²= from 0.694 to 0.771) which most often include the value of the angles POr-NBa and H, the distance P-PTV and the ratio S-ar:ar-Go. When analyzing reliable models of teleradiographic indicators according to the Steiner method, which were included in the third group depending on the indicators of the first and second groups with a coefficient of determination higher than 0.6, it was found that out of 8 possible in young people with a wide face type, 7 models were built (R²= from 0.662 to 0.946). which most often include the magnitude of the angles ANB and SN-GoGn and the distance P-PTV; in young women with a very wide face type – 4 models (R²= from 0.635 to 0.844) which most often include the value of the angles ANB, SNA, POr-NBa and the distance Pog-NB; in young women with a wide type of face – 6 models (R²= from 0.617 to 0.923), which most often include the value of the distances Pog-NB and N-CC and the angle ANB. Construction of regression models of teleradiographic indicators used in the Steiner method in Ukrainian young men and young women with orthognathic occlusion is the foundation for creating a database of normative cephalometric indicators in Ukraine, which will provide dental care to the population at the current level.

Regression models of teleroentgenograhic indicators of the position of teeth and the profile of face soft tissues in juvenile aged persons with different face types according to Schwarz A.M.

Considering the differences in the values of teleroentgenograhic (TRG) indicators in different racial, gender, ethnic, age, population, geographical population groups and numerical methods of TRG analysis, determination of normative values of cephalometric, gnatometric TRG-indicators, their interdependencies in the population of different countries is extremely important both for human anatomy and for the practice of dentists. This fully applies to residents of Ukraine of different age groups. The aim of the work is to develop and analyze regression models of teleroentgenograhic indicators of tooth position and facial soft tissue profile according to Schwarz A.M. in Ukrainian young men and young women with different facial types. Lateral teleroentgenograms of 49 young men (aged 17 to 21 years) and 76 young women (aged 16 to 20 years) with physiological occlusion as close as possible to orthognathic were analyzed. In the license package “Statistica 6.0” regression models of indicators of position of teeth and profile of soft tissues of the face according to the method of Schwarz A.M. depending on basic cephalometric and gnatometric indicators separately for boys and for girls with different types of the face are constructed. In young men, 16 of the 24 possible reliable regression models were constructed, in which the coefficient of determination is greater than 0.6 (R2=from 0.609 to 0.998). For young men with 1st (back face type) and 3rd (front face type) face types, the following models were created with respect to 5 indicators from 8 possible (respectively, angles Max1-SpP S-arz, distances Sn-Pn and Pog’-Por, angles Gl’LsPog’ and SnPog’-Pn; R2 = from 0.609 to 0.998 and angles Max1-SpP S-arz and Mand1-MP Schwars, distances Sn-Pn and Pog’-Por, angle Gl’LsPog’; R2 = from 0.609 to 0.946), and for young men with 2nd face types (average face type according to Schwarz AM) – for 6 indicators (angles Max1-SpP S-arz and Mand1-MP Schwars, distances Sn-Pn and Pog’-Por, angles Gl’LsPog’and SnPog’-Pn; R2 = from 0.690 to 0.990). In young women, 17 of the 24 possible reliable models with R2 greater than 0.6 (R2 = 0.628 to 0.958) were constructed. For young women with 1st type of face 6 indicators are modeled – angles Max1-SpP S-arz, distances Sn-Pn and Pog’-Por, angles Gl’LsPog’and SnPog’-Pn, the distance of Li-SnPog’(R2= from 0.663 to 0.958). For young women with 2nd face type, the following models were created for 7 indicators – angles Max1-SpP S-arz and Mand1-MP Schwars, distances Sn-Pn and Pog’-Por, angles Gl’LsPog’ and SnPog’-Pn, distances Li-SnPog’(R2= from 0.628 to 0.891). For young women with 3rd face type the smallest number of models with R2 larger than 0.6 was built, compared to all groups of persons with different face types – only 4 models for Max1-SpP S-arz angle, Pog’-Por distance, angles Gl’LsPog’ and SnPog’-Pn (R2 from 0.718 to 0.847).

Selfie taking behaviour of college students

The current study was undertaking with the aim of Selfie taking behaviour of college students. Yamane’s formula used to calculate sample. In the current study total 203 respondents (undergraduate students) were selected randomly from two colleges of Assam Agricultural University, Jorhat. The data was analyzed using statistical methods in MS excel and SPSS. The results from the present study showed that majority of respondents (61%) were taking Selfies occasionally, 62.56 per cent respondents took 1-3 numbers of Selfies on an average day and more numbers of the respondent (76.84 %) spent less than 15minutes per day on taking Selfies. It may be because they were not easily satisfied with their self portrait. Respondents preferred to take Selfies at evening time, majority of the respondents preferred to take Selfies with their friends than others. Some of them like to take head/ face type of Selfies, and preferred different and attractive places. More number of respondents uploads their Selfies on whatsapp after editing and feels negative when the received negative comments on their portrait. A few of them felt upset when they saw negative comments on their Selfie and some respondents never untagged themselves in group Selfies if not looking good.

REGRESSION MODELS OF INDIVIDUAL LINEAR DIMENSIONS NECESSARY FOR CONSTRUCTING THE CORRECT FORM OF DENTAL ARCH IN YOUNG WOMEN WITH A WIDE FACE, DEPENDING ON THE FEATURES OF ODONTOMETRIC AND CEPHALOMETRIC INDICATORS

The purpose of the study: build and analyze the regression models of computed tomographic parameters necessary to determine the correct shape of dental arches, depending on the odontological and cephalometric parameters for girls with normal occlusion close to orthognathic occlusion and a wide type of face. Materials and methods: for 20 girls with normal occlusion close to the orthognathic bite and with a wide face type, in the license package "Statistica 6.0" developed regression models of linear sizes necessary for constructing the correct shape of dental arches, depending on odontometric and cephalometric indicators. Results: thus, in girls with normal occlusion close to orthognathic occlusion, having a wide type of face, all 18 possible reliable regression models (with a coefficient of determination from 0.620 to 0.973) of the reproduction of individual computed tomographic characteristics of the dental arches of upper and lower dental jaws depending on odonto- and cephalometric parameters were developed and analyzed. Conclusions: the results obtained indicate the need to take into account the type of face when calculating the parameters of dental arches.

Relationship between protein deficiency accompanied by low body mass index with the head shape and face type of 6-7 years old children

Introduction: Environmental factors such as socio-economic and nutrients factor can affect the dimensions and proportions of the body. Nutritional intake has a long-term effect on physical growth and can be assessed through body mass index up to age. Children with a nutritional disorder are characterised with low body mass index. This study was aimed to analyse the relationship of protein deficiency and low body mass index on the head shape and facial type of 6-7 years old children. Methods: The research type was descriptive correlative, and the research was conducted towards 16 subjects with low body mass index. Protein deficiency was assessed from food intake for 3 x 24 hours through food recall method and interview. The measurement of the cephalic and facial index was carried out to find out the head shape and face type, and then to correlate with protein deficiency and body mass index. Data was analysed using the chi-square test with the significance (p-value)<0.05. Results: There was a significant correlation between protein deficiency and low body mass index with the head shape (p-value=0.007), and the facial type of 6-7 years old children (p-value=0.027). There was a significant correlation between head shape with facial type in protein-deficient children with low body mass index (p-value=0). Conclusion: Protein deficiency accompanied by low body mass index influences the head shape and facial type of children.

MODELS OF INDIVIDUAL LINEAR DIMENSIONS NECESSARY FOR THE CONSTRUCTION OF THE CORRECT FORM OF DENTAL ARCHES IN YOUNG MEN WITH A WIDE FACE, DEPENDING ON THE FEATURES OF ODONTOMETRIC AND CEPHALOMETRIC INDICATORS

The aim is development and analysis of regression models of linear dimensions necessary for the construction of the correct form of dental arches in young men with a wide face, depending on the features of odontometric and cephalometric indicators. Material and methods: Primary computed tomographic indices of tooth size and cephalometric parameters of 44 young men with normal occlusion were obtained from the data bank of the National Pirogov Memorial Medical University, Vinnytsya. Face type was determined using the Garson morphological index. In licensed statistical package “Statistica 6,0” developed regression models of linear dimensions necessary for the construction of the correct form of dental arches. Results: As a result of researches, it is established that all 18 reliable models of the sizes used for construction of the correct form of dental arches, depending on peculiarities of odontometric and cephalometric indices with a coefficient from 0.645 to 0.944 are constructed. Built models in adolescents with a broad face type more often include odontometric than cephalometric indicators. The most commonly used odontometric indices are: the width of the crowns of the teeth in the mesio-distal and vestibulo-oral directions, 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. Conclusions: In adolescents with a broad type of face with normal occlusion, all 18 possible reliable regression models of reproduction of the individual characteristics of the dental arches of the upper and lower jaws were determined and analyzed.