Tt. Ucem et S. Yuksel, EFFECTS OF DIFFERENT VECTORS OF FORCES APPLIED BY COMBINED HEADGEAR, American journal of orthodontics and dentofacial orthopedics, 113(3), 1998, pp. 316-323
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.