The purpose of this study was to evaluate treatment effects of the modified Teuscher appliance (NITA) in early Class II division 1 malocclusion. For this purpose, treatment effects of the bionator were compared with those of the MTA. The twenty subjects who were treated excellently with bionator and MTA were selected in each group. In pre- and post-treatment lateral cephalograms, 50 variables were measured, and then the differences between pretreatment and posttreatment data of the bionator and the MTA were statistically evaluated by t-test.
´The results were as follows
1. The linear measurements that showed large difference between the bionator group and the MTA group are UI to Fl-I. U1 to PP, U6 to FFL U6 to PP. Ar-Pog, ramus height. L1 to A-Pog. Ll to facial plane (p<0.05).
2. The angular measurements that showed large difference between the bionator group and the MTA group are SNB, SNA, FABA, APDI (p<0.05).
3. The measurements of the growth pattern such as facial height ratio, FMA, SN-IIW angle showed no difference between two groups (p>0.05).
These results suggest that the bionator influence the mandiblar growth and lower dentoalveolar structures more than
the MTA, and the 11´TA influence upper jaw and upper dentoalveolar structures more than the bionator comparatively ill early Class II division I malocclusion.
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