A comparison of chincap and maxillary protraction appliances in the treatment of skeletal Class III malocclusions

The purpose of this retrospective investigation was to compare cephalometri cally the treatment effects of chincap and maxillary protraction appliances in subjects with a Class III skeletal malocclusion with a combination of a n underdeveloped maxilla and prominent mandible. Twenty-four patients were divided into two groups according to the treatment type; the chincap group (mean age 11.03 years, n = 12) and the Delaire type maxillary protraction a ppliance group (mean age 10.72 years, n = 12). In both groups, a significan t increase in ANB, molar relationship, and overjet showed the effect of the appliances in the treatment of Class III malocclusions. In comparing the t wo groups, the maxilla was displaced more anteriorly and the molar relation ship correction was greater in the maxillary protraction appliance group (P < 0.05). Angular and dimensional parameters for lower incisor/NB and nasol abial angle showed significant differences between the groups (P < 0.05).