Kombine headgearlerde oluşturulan farklı kuvvet vektörlerinin iskeletsel ve dentoalveolar yapılar üzerine etkilerinin incelenmesi

Abstract

105 SUMMARY Combined headgear was used for upper molar distalization in the treatment of Class II malocclusion. The purpose of this study was to evaluate the effects of different vectors of forces applied by combined headgear on skeletal and dentoalveolar structures. The study material consisted of 30 patients with Class II dental relationships and steep mandibular plane angle. All patients were matched according to their ANB, SN/Go-Gn angles and skeletal ages.so three groups were constructed with 10 patients in each group.The average skeletal ages were 10 years 6 months for the first treatment group, 10 years 2 months for the second treatment group,10 years 1 months for the third treatment group. Lateral cephalograms, anteroposterior, basiler and hand- wrist radiographs were taken before and after treatment. All of the patients were treated with extraoral combined traction to the maxillary first molars. In the first treatment group a force of 150 grams per side was adjusted for the highpull component and of 150 grams per side for the cervical component. In the second treatment group force adjustment was made as 200 grams per side for the highpull component and 100 grams per side for the cervical component and in the third treatment group a force of 100 grams per side was adjusted for the highpull component and of 200 grams per side for the cervical component. The patients were instructed to wear the appliance 20 hours per day until the molar relationship was106 corrected. The treatment time was between 2 and 9 months for the first group, 3 and 7 months for the second group, 2 and 7 months for the third group. 85 parameters obtained from the lateral cephalograms, anteroposterior and basiler radiographs that was taken before and after the treatment, were evaluated. Statistical analysis were made to determine the changes that occurred during treatment, the differences between the groups and the correlations between the upper first molar vertical displacement and the dento-skeletal parameters. Molar distalization was achieved by different vectors of forces applied by combined headgear. Changes in the direction of pull were effective on upper first molar tipping degree and vertical displacement. Also by the evaluation of occlusal and mandibular plane angles, significant differences between the groups were observed. It was obvious that for the individuals showing vertical growth tendencies occipitally directed forces applied by combined headgear were more convinient compared to other types of force systems used in this study.

105 SUMMARY Combined headgear was used for upper molar distalization in the treatment of Class II malocclusion. The purpose of this study was to evaluate the effects of different vectors of forces applied by combined headgear on skeletal and dentoalveolar structures. The study material consisted of 30 patients with Class II dental relationships and steep mandibular plane angle. All patients were matched according to their ANB, SN/Go-Gn angles and skeletal ages.so three groups were constructed with 10 patients in each group.The average skeletal ages were 10 years 6 months for the first treatment group, 10 years 2 months for the second treatment group,10 years 1 months for the third treatment group. Lateral cephalograms, anteroposterior, basiler and hand- wrist radiographs were taken before and after treatment. All of the patients were treated with extraoral combined traction to the maxillary first molars. In the first treatment group a force of 150 grams per side was adjusted for the highpull component and of 150 grams per side for the cervical component. In the second treatment group force adjustment was made as 200 grams per side for the highpull component and 100 grams per side for the cervical component and in the third treatment group a force of 100 grams per side was adjusted for the highpull component and of 200 grams per side for the cervical component. The patients were instructed to wear the appliance 20 hours per day until the molar relationship was106 corrected. The treatment time was between 2 and 9 months for the first group, 3 and 7 months for the second group, 2 and 7 months for the third group. 85 parameters obtained from the lateral cephalograms, anteroposterior and basiler radiographs that was taken before and after the treatment, were evaluated. Statistical analysis were made to determine the changes that occurred during treatment, the differences between the groups and the correlations between the upper first molar vertical displacement and the dento-skeletal parameters. Molar distalization was achieved by different vectors of forces applied by combined headgear. Changes in the direction of pull were effective on upper first molar tipping degree and vertical displacement. Also by the evaluation of occlusal and mandibular plane angles, significant differences between the groups were observed. It was obvious that for the individuals showing vertical growth tendencies occipitally directed forces applied by combined headgear were more convinient compared to other types of force systems used in this study.