CASE STUDY the classification range of a Class III skeletal classification to coincide with the unilateral ½ step Class III molar. The Y-Axis of 60.1 degrees and the SN-GoGn of 23 degrees does not show a vertically growing jaw angle. (Fig. 5) No upper or lower airway constriction was present on the Cephalometric X-ray. Since the patient is 30.10 years old it is assumed that the lower jaw is finished growing. Her resulting Pre-Treatment Diagnosis is Class III Dental, And Class III Skeletal. The inter-incisal angle was at 95 degrees. The normal for African Americans is 119. 4 Fig. 5 TREATMENT OBJECTIVES ᕡ Level and align all teeth to a balanced fully intercuspated molar, premolar and canine to a Class I occlusion with proper overjet and overbite. ᕢ Close all spaces while main-taining the proper anterior posterior position ᕣ Move molars and canines to Class I. ᕤ Place tongue trainers on lingual of incisors to prevent tongue thrusting. Fig. 6 TREATMENT PLAN ᕡ Straight wire Brackets on the upper and lower arches (.022 slot Roth Rx with hooks on canines, premo-lars, and molars.) ᕢ Arch wire sequence: .012 niti, .014 niti, .018 niti. .020 ss., 16 x 22 niti, 16 x 22 ss, and 19 x 25 Beta titanium. Finish with a 19 x 25 20 degree pretorqued wire for the lower anterior area. Fig. 7 ᕣ Check level and alignment at each appointment. ᕤ Consolidation of spacing and correcting anterior posterior position to offset the Class III tendency. ᕥ Finish case to a Class I occlusion. 10 Summer 2020 JAOS
Journal of the American Orthodontic Society Summer 2020: Page 10
