CHANGES IN CRANIOFACIAL PARAMETERS DUE TO DISTAL MOVEMENT OF PERMANENT MAXILLARY MOLARS IN PATIENTS WITH DISTAL OCCLUSION AND HORIZONTAL JAW GROWTH DIRECTION
DOI:
https://doi.org/10.35220/2523-420X/2024.1.13Keywords:
upper jaw, permanent molars, distal occlusion, skull, teleradiographsAbstract
The purpose of this study. Study of changes in the parameters of the facial skull due to distal movement of permanent molars of the upper jaw in patients with distal bite, with a horizontal direction of jaw growth. Material and research methods. The study involved 52 patients who applied to the Department of orthodontics of the Bogomolets National Medical University aged 8-16 years from patients with distal bite. To determine the features of the morphological structure of the facial part of the skull, 98 telerentgenograms of the head made in lateral projections were used. Side telerentgenograms of the head were made on the ORTHOPHOS device of the SIRONA SIDEXIS company, with a focal length of 150 cm, a voltage of 65-75 KV, an exposure time of 1.6-2.0 seconds, and a current of 14 ma. Head fixation was performed using a cephalostat. A beam of Rays was directed to the middle of the external auditory canal. To determine the features of the structure of the facial skull in patients with distal occlusion, 15 angular and 9 linear parameters were studied. The direction of jaw growth was determined by the value of the total angle according to Bjork. During statistical processing of the obtained results, the computer program STATISTICA 6.1. was used to assess their reliability and measurement errors. During the crystallization of permanent molars of the upper jaw, the occlusal plane rotates upwards counterclockwise relative to the NS plane, which is due to distal movement of the teeth. Molar distalization causes the mandibular plane to rotate clockwise relative to the NS plane, which affects the overall configuration of the face. Conclusion. The data obtained suggest that distalization of permanent molars in patients with distal bite and horizontal direction of jaw growth can provide stable treatment results, since the parameters of the facial skull are optimized.
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