Sınıf II, divizyon 1 vakaların tedavisinde kullanılan Twin-Blok ve Andersen apareylerinin iskeletsel ve dentoalveolar yapılar üzerindeki etkilerinin karşılaştırmalı olarak incelenmesi

Abstract

103 SUMMARY This research was performed to compare the effects of Andresen and twin-block appliances on skeletal and dentoalveolar structures in the early treatment period of class II, division 1 malocclusions. Patients having skeletal and dental class II, division 1 malocclusions were selected and two treatment groups with a total of 26 patients and one control group with 13 patients were constructed. Lateral cephalograms and hand-wrist radiographs of these patients were taken before and after treatment, which formed the material of this research. The average chronological ages were 1 1 years 1 1 months for the first treatment group (monoblock), 1 1 years 6 months for the second treatment group (twin- block) and 1 1 years 9 months for the control group. An Andresen appliance was applied to each of the patients in the first treatment group where as, a twin-block appliance was applied to the each member of the second treatment group. The patients were instructed to wear the monoblock for 16 hours/day where as, patients in the second treatment group were instructed to wear the twin-block for 24 hours/day. Patients of the control group were followed for 12-20 months104 without any intervention. The treatment time for the first group was between 3 and 13 months and for the second group between 3 and 7 months. 37 different parameters were evaluated on the lateral cephalograms. Statistical analysis were made to determine the differences which occurred during the research period. The following results were observed by using these different functional appliances; the correction of sagittal jaw discrepancies and the stimulation of the growth of the lower jaw were obtained; particularly, in the twin-block group the SNA and Co-ANS values decreased, mandibular plane angle and gonial angle increased, a decrease in the degree of over-bite. Where as, in the monoblock group, effective mandibular length increased, within both groups the facial convexity and over-jet decreased, a distal movement of the upper molars and the mesialisation of the lower molars were observed. In the monoblock group upper incisors demonstrated a greater degree of retrusion and the inter incisor angle increased, however within the twin-block group the lower incisors showed a greater degree of protrusion.

103 SUMMARY This research was performed to compare the effects of Andresen and twin-block appliances on skeletal and dentoalveolar structures in the early treatment period of class II, division 1 malocclusions. Patients having skeletal and dental class II, division 1 malocclusions were selected and two treatment groups with a total of 26 patients and one control group with 13 patients were constructed. Lateral cephalograms and hand-wrist radiographs of these patients were taken before and after treatment, which formed the material of this research. The average chronological ages were 1 1 years 1 1 months for the first treatment group (monoblock), 1 1 years 6 months for the second treatment group (twin- block) and 1 1 years 9 months for the control group. An Andresen appliance was applied to each of the patients in the first treatment group where as, a twin-block appliance was applied to the each member of the second treatment group. The patients were instructed to wear the monoblock for 16 hours/day where as, patients in the second treatment group were instructed to wear the twin-block for 24 hours/day. Patients of the control group were followed for 12-20 months104 without any intervention. The treatment time for the first group was between 3 and 13 months and for the second group between 3 and 7 months. 37 different parameters were evaluated on the lateral cephalograms. Statistical analysis were made to determine the differences which occurred during the research period. The following results were observed by using these different functional appliances; the correction of sagittal jaw discrepancies and the stimulation of the growth of the lower jaw were obtained; particularly, in the twin-block group the SNA and Co-ANS values decreased, mandibular plane angle and gonial angle increased, a decrease in the degree of over-bite. Where as, in the monoblock group, effective mandibular length increased, within both groups the facial convexity and over-jet decreased, a distal movement of the upper molars and the mesialisation of the lower molars were observed. In the monoblock group upper incisors demonstrated a greater degree of retrusion and the inter incisor angle increased, however within the twin-block group the lower incisors showed a greater degree of protrusion.