Determination of individual angular characteristics of the teeth positions according to the computer tomography in Ukrainian adolescents with orthognathic bite
The lack of the ability to determine the individual standard angle characteristics of the position of the teeth and the technical provision of their control often does not lead to the expected result and in each case requires individualization, the vision of which is based, as a rule, on the experience and intuition of the doctor. In order to solve such a situation, in addition to improving the positioning protocols of the non-removable equipment, the physician should be able to clearly identify the individual angular characteristics of the tooth-jaw system. The purpose of the study – by studying computer tomography and cephalometric indices and conducting direct stepwise regression analysis to develop in Ukrainian adolescents with orthognathic bite mathematical models of individual angular positions of teeth. Using the Veraviewepocs 3D device, Morita (Japan) at 38 young men (aged from 17 to 21) and 55 young women (aged from 16 to 20 years) with normal occlusion close to orthognathic bite received and analyzed dental tomograms and lateral teleroentgenograms. Cephalometric points and measurements were performed according to recommendations of A. M. Schwarz, J. McNamara, W. B. Downs, R. A. Holdway, G. P. F. Schmuth, C. C. Steiner and C. H. Tweed. Anatomical points were determined taking into account the recommendations of A. E. Athanasiou and S. I. Doroshenko and Y. A. Kulginsky. The simulation of CT indexes describing the position of individual teeth relative to each other, to the bone cranial structures and the profile of adolescents with orthognathic bite, depending on the metric characteristics of the skull, which are usually unchanged during surgical and orthodontic treatment, as well as the width, lengths, angles and positions of the upper and lower jaws that may be altered by orthodontic surgery done. The statistical processing of the obtained results was carried out in the license package “Statistica 6.0” using a direct stepwise regression analysis. It was found that in young men of 40 possible models, 23 were constructed with a determination coefficient R2 of 0.557 to 0.832, while in young women, only 8 models with a determination coefficient R2 of 0.581 to 0.832. Moreover, in the young men – of 10 possible 9 models of vestibular-tongue inclination of corresponding teeth (R2 from 0.557 to 0.832) were constructed; out of 10 possible 5 models of mesio-distal inclination of corresponding teeth (R2 from 0.558 to 0.769) constructed; of the possible 14 constructed 6 models of rotation of the corresponding teeth (R2 from 0.579 to 0.737); and in young women - there are only 5 models of vestibular-tongue inclination of the corresponding teeth (R2 from 0.603 to 0.665). In addition, in both young men and young women, models of the size of the inter-incision angle (R2 0.748 in young men and 0.581 in young women) were constructed, the magnitude of the angle of inclination of the lower canine in the jet plane (R2 respectively 0.729 and 0.793), and the magnitude of the inclination of the closure planes relative to the palatal plane (R2 respectively 0.808 and 0.832). In the analysis it was found that in young men, most frequently models included - indicator WITS (7.0%); angle GL_SNPOG (5.4%); distance S_E, angle ММ, angle NSBA (by 4.7%); angle AB_NPOG, angle N_POG_, distance N_SE, coefficient N_SP_SP, angle P_OR_N (by 3.9%). In young women, most frequently models included – angle N_POG_ (14.3%); angle AB_NPOG (10.2%); indicator WITS (8.2%); angle ММ, angle ANB, length of the branch of the mandible R_ASC (by 6.1%). Thus, in the work with the help of the method of step-by-step regression with inclusion, among Ukrainian adolescence, on the basis of peculiarities of computer-tomographic and teleroentgenography indices, reliable models of computer-tomographic individual linear angular characteristics of the position of teeth necessary for constructing the correct three-dimensional geometry of dental arches are developed and analyzed.
 Alavi, S., & Tajmirriahi, F. (2016). Assessment of dimensional accuracy of preadjusted metal injection molding orthodontic brackets. Dent. Res. J. (Isfahan), 13(5), 440-445. PMID: 27857770
 Athanasiou, A. E. (1997). Orthodontic cephalometry. London. Osby Wolfe.
 Castro, I. O., Frazão-Gribel, B., Alencar, A. H. G., Valladares-Neto, J., & Estrela, C. (2018). Evaluation of crown inclination and angulation after orthodontic treatment using digital models : Comparison to the prescription of the brackets used. J. Orofac. Orthop., 79(4), 227-234. doi: 10.1007/s00056-018-0136-2
 Coşkun, İ., & Kaya, B. (2018). Cone Beam Computed Tomography in Orthodontics. Turk. J. Orthod., 31, 55-61. doi: 10.5152/TurkJOrthod.2018.18020
 Dmitriev, M. O. (2016). Definition of normative cephalometric parameters by Steiner method for Ukrainian young men and women. World of Medicine and Biology, 3(57), 28-32.
 Dmitriev, M. O. (2017). Identification of normative cephalometric parameters based on G. Schmuth method for young male and female Ukrainians. Reports of Morphology, 23(2), 288-292.
 Dmitriev, M. O., Chugu, Т. V., Gerasymchuk, V. V., & Cherkasova, О. V. (2017). Determination of craniometric and gnatometric indicators by А. М. Schvartz metod for Ukrainian boys and girls. Biomedical and Biosocial Аnthropology, 29, 53-58.
 Dmitriev, M. O., Tikholaz, V. O., Shepitko, K. V., Shinkaruk-Dykovytska, М. М., Androshchuk, O. V., Bobruk, S. V., & Zakalata, T. R. (2018). Sexual dimorphism of normative cephalometric parameters determined by the Holdaway method in boys and girls of Podillia. World of Medicine and Biology, 2(64), 39-43. doi: 10.26724/2079-8334-2018-2-64-39-43
 Doroshenko, S. I., & Kulginskiy, E. A. (2007). Teleroentgenography Basics. К.: Zdorov'ya.
 Downs, W. B. (1956). Analysis of the dentofacial profile. Angle Orthodontist, 26, 191-212.
 Gunas, І. V., Dmitriev, M. O., Tikholaz, V. O., Shinkaruk-Dykovytska, М. М., Pastukhova, V. A., Melnik, М. Р., & Rudiy, Yu. I. (2018). Determination of normal cephalometric parameters by J. McNamara method for Ukrainian boys and girls. World of Medicine and Biology, 1(63), 19-22. doi: 10.26724/2079-8334-2018-1-63-19-22
 Gunas, І. V., Dmitriev, М. О., Prokopenko, S. V., Shinkaruk-Dykovytska, М. М., & Yeroshenko, G. A. (2017). Determination regulatory cephalometric options by the method of Tweed International Foundation for Ukrainian boys and girls. World of Medicine and Biology, 4(62), 27-31. doi: 10.26724/2079-8334-2017-4-62-27-31
 Holdaway, R. A. (1983). A soft-tissue cephalometric analysis and its use in orthodontic treatment planning. Part I. Am. J. Orthod., 84(1), 1-28. PMID: 6575614
 Holdaway, R. A. (1984). A soft-tissue cephalometric analysis and its use in orthodontic treatment planning. Part II. Am. J. Orthod., 85, 279-293. https://doi.org/10.1016/0002-9416(84)90185-4
 Jain, M., Varghese, J., Mascarenhas, R., Mogra, S., Shetty, S., & Dhakar, N. (2013). Assessment of clinical outcomes of Roth and MBT bracket prescription using the American Board of Orthodontics Objective Grading System. Contemp. Clin. Dent., 4(3), 307-312. doi: 10.4103/0976-237X.118361
 Jain, S., Kiran, H. J., Neha, K., Bhattacharjee, D., Rana, S., & Nayyar, A.S. (2017). Assessment of tip, torque, and tooth size discrepancies in Angle's class II division 2 malocclusion. International jornal of orofacial biology, 1(1), 4-12. doi:10.4103/ijofb.ijofb_9_16
 Kannabiran, P., Thirukonda, G. J., & Mahendra, L. (2012). The crown angulations and inclinations in Dravidian population with normal occlusion. Indian jornal of dental research, 23(1), 53-58. doi: 10.4103/0970-9290.99039
 Kapila, S., Conley, R. S., & Harrell, W. E. Jr. (2011). The current status of cone beam computed tomography imaging in orthodontics. Dentomaxillofac. Radiol., 40, 24-34. doi: 10.1259/dmfr/12615645
 Lee, R. J., Pi, S., Park, J., Nelson, G., Hatcher, D., & Oberoi, S. (2018). Three-dimensional evaluation of root position at the reset appointment without radiographs: a proof-of-concept study. Progress in Orthodontics, 19(1), 15. https://doi.org/10.1186/s40510-018-0214-4
 Leman, К., & Helvig, E. (1999). Basics of therapeutic and prosthetic dentistry. Lvov: GalDent.
 Lombardo, L., Perri, A., Arreghini, A., Latini, M., & Siciliani, G. (2015). Three-dimensional assessment of teeth first-, second- and third-order position in Caucasian and African subjects with ideal occlusion. Progress in Orthodontics, 16, 11. doi: 10.1186/s40510-015-0086-9
 Mah, J. K., Huang, J. C., & Choo, H.-R. (2010). Practical Applications of Cone-Beam Computed Tomography in Orthodontics. The Journal of the American Dental Association, 141, 7-13. https://doi.org/10.14219/jada.archive.2010.0361
 McNamara, J. A. Jr. (1984). A method of cephalometric evaluation. Am. J. Orthod., 86(6), 449-469. PMID: 6594933
 Mendonça, M. R., Verri, A. C., Fabre, A. F., & Cuoghi, O. A. (2014). Analysis of mesiodistal angulations of preadjusted brackets. Braz. Oral. Res., 28, pii: S1806.83242014000100247. http://dx.doi.org/10.1590/1807-3107BOR-2014.vol28.0038
 Mittal, M., Thiruvenkatachari, B., Sandler, P. J., & Benson, P. E. (2015). A three-dimensional comparison of torque achieved with a preadjusted edgewise appliance using a Roth or MBT prescription. Angle Orthod., 85, 292-297. doi: 10.2319/122313-941
 Papageorgiou, S. N., Sifakakis, I., Keilig, L., Patcas, R., Affolter, S., Eliades, T., & Bourauel, C. (2017). Torque differences according to tooth morphology and bracket placement: a finite element study. European Journal of Orthodontics, 39(4), 411-418. https://doi.org/10.1093/ejo/cjw074
 Plooij, J. M., Maal, T. J., Haers, P., Borstlap, W. A., Kuijpers-Jagtman, A. M., & Bergé, S. J. (2011). Digital three-dimensional image fusion processes for planning and evaluating orthodontics and orthognathic surgery. A systematic review. Int. J. Oral Maxillofac. Surg., 40(4), 341-352. doi: 10.1016/j.ijom.2010.10.013
 Schmuth, G. P. F. (1971). Methodische Schwierigkeiten bei der Anwendung der Röntgenkephalometrie in der Kieferorthopädie. Fortschritte der Kieferorthopädie, 32(2), 317-325.
 Schwarz, A. M. (1960). Röntgenostatics; practical evaluation of the tele-X-ray-photo. Publisher: Brooklyn, N.Y.: Leo L. Bruder.
 Steiner, C. C. (1959). Cephalometrics in clinical practice. Angle Orthod., 29, 8-29.
 Tong, H., Kwon, D., Shi, J., Sakai, N., Enciso, R., & Sameshima, G. (2012). Mesiodistal angulation and faciolingual inclination of each whole tooth in 3-dimensional space in patients with near-normal occlusion. American Journal of Orthodontics and Dentofacial Orthopedics. 141(5), 604-617. doi: 10.1016/j.ajodo.2011.12.018
 Tweed, C. H. (1954). The Frankfort-Mandibular Incisor Angle (FMIA) in Orthodontic Diagnosis, Treatment Planning and Prognosis. Angle Orthod., 3, 121-169.
 van Loenen, M., Degrieck, J., de Pauw, G., & Dermaut, L. (2005). Anterior tooth morphology and its effect on torque. European Journal of Orthodontics, 27, 258-262. doi:10.1093/ejo/cji007
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