CASE STUDY “The patient was Bi-protrsive with a very convex profile and an anterior divergent tendency. Post treatment cephlametric x-ray and final tracing revealed that the interincisal angle was improved from 95 degrees to 111 degrees resulted in offsetting the convex profile and improving the Bi-protusions.” ᕦ Hawley retainer with clear acrylic around front wire and permanent bonded wire on upper lateral and central incisors and bonded wire from canine to canine on lower arch. ESTIMATED TREATMENT TIME: 14 – 16 months Fig. 8 nium wire to express the full tip and torque prescription of the bracket. A 20-degree pre-torqued wire was used to further upright the lower teeth. (Fig. 7) Active Treatment Time,15 months. sive with a very convex profile and an anterior divergent tendency. Post treatment cephlametric x-ray and final tracing (Figs. 8–9) revealed that the interincisal angle was improved from 95 degrees to 111 degrees resulted in offsetting the convex profile and improving the Bi-protu-sions. This also resulted in improv-ing and correcting the patient’s overjet. There was much effort devoted to keeping the correct ante-Fig. 9 ANALYSIS I.P. started with a Class III Maloc-clusion with mild to moderate spac-ing in both the maxilla and the mandible. The patient was Bi-protr-CASE SUMMARY AND ANALYSIS I.P.’s Dental Class III malocclu-sion was treated using .022 slot Roth Rx straight wire bracket prescription with hooks on the canines, premolars and molars. The initial wire was a .012 niti wire to begin the leveling and aligning. This was followed by an .014 niti, .018 niti and then an .020 ss wire. Once the .020 ss was placed a lower power chain was engaged to set the lower arch while the upper arch was tied in with safety ties. (Fig. 6) After all the spacing was consolidated with in the lower arch, then the upper arch spacing was closed while utilizing stops anterior to the molar tubes to maintain the upper anterior position. A combination of power chain and light closed coil niti springs were used to close the upper arch to prevent upper incisor dumping. The case was finished using a 19 x 25 beta tita-www.orthodontics.com Summer 2020 11
Journal of the American Orthodontic Society Summer 2020: Page 11
