Sentrik Bite Blokların Vertikal Düzlemde Dentofasiyal Yapılar Üzerine Etkilerinin Değerlendirilmesi

Abstract

AKDAŞ, E. K. The vertical plane effects of centric bite blocks on dentofacial structures. Hacettepe University, Institute of Health Sciences, Speciality Thesis in Orthodontics Programme, Ankara, 2017. The aim of this prospective study is to examine the effects of bite blocks prepared in centric relation during the prepubertal growth period. Subjects were selected from among the patients who were consulted to Hacettepe University Faculty of Dentistry. For the aims of this study, a group of 16 patients, between 8 and 11 years of age, having vertical growth pattern and open bite tendency were recruited. Bite blocks were fabricated according to the centric relation position and hold in place until a positive overbite was achieved (Treatment time: 9,7±1,2 month). 15 subjects who were under evaluation for orthodontic treatment, and matched for age were selected as the control group from a previously performed study. Analyzes were performed on pre and post-treatment lateral head films in order to define skeletal and dental changes. Data of the treatment and control groups were assessed using Kolmogorov-Smirnov, Shapiro Wilks, dependent and independent groups t test. The angular values showing the vertical development of the face decreased in the treatment group (p <0,05) and increased in the control group (p> 0,05). The increase in ramus height and posterior face height was significantly higher in the treatment group (p <0.05). The increase in the anterior face height in the control group was significantly higher than the treatment group (p <0.05). Mandibular skeletal measurements showed significant increases in the treatment group compared to the control group (p <0,05). In the treatment group, the vertical positions of the upper molar teeth increased less than the control group. There was a significant increase in overbite in the treatment group (p <0.05). As for the soft tissue evaluation, it has been observed that pogonion became more prominent in treatment group (p <0.05). It can be concluded that centric bite blocks contributed to the treatment of anterior openbite by providing an upward and forward rotation of the mandible, elongation of the posterior facial height and ramal height, and restriction of upper molar eruption.