EFFECTS OF DIFFERENT VECTORS OF FORCES APPLIED BY COMBINED HEADGEAR

The effects of various directed farces applied by combined headgear we re evaluated in this study, The study material consisted of 30 patient s with Class II dental relationships and steep mandibular plane angles , Three groups of 10 patients each were formed. in the first treatment group, farces of 150 gm per side were used for the high-pull componen t and the cervical component. In the second treatment group, forces of 200 gm per side for the high-pull component and 100 gm per side for t he cervical component were applied, In the third treatment group, forc es of 100 gm per side were applied for the high-pull component and 200 gm per side for the cervical component. Distal tipping of upper molar was greatest in the third treatment group, Intrusion of the upper mol ar in the second treatment group and extrusion of the upper molar in t he third treatment group were statistically significant, Changes in oc clusal and mandibular plane angles showed significant differences betw een the groups.