CASE STUDY “The patient started with a Class I Maloclussion with moderate to severe spacing in the mandible and the maxilla. Post treatment cephlametric x-ray and final tracing revealed that the inter-incisal angle was corrected to 126.3 degrees, which significantly improved the patient’s over jet and over bite.” consolidate with the lower arch, then the spacing was closed with power chain while utilizing stops anterior to the molar tubes to main-tain the upper anterior position. The anterior six front teeth were lace ligatured together while the spaces and contacts were tightened in the posterior. (Fig. 6) The case was finished using a 19x25 beta titanium to express the full tip and torque prescription of the bracket. (Fig. 7) Fig. 8 Pre and Post Treatment Analysis Skeletal SNA (º) SNB (º) ANB (º) SND (º) SN -GoGn (º) Occ Plane to SN (º) Y-Axis (SGn-SN) (º) Interincisal Angle (U1-L1) (º) Gonial/Jaw Angle (Ar-Go-Me) (º) U1 -NA (º) L1 -NB (º) U1 -NA (mm) L1 -NB (mm) Pog -NB (mm) Wits Appraisal (mm) S-L (mm) Soft Tissue Upper Lip -S Line (mm) Lower Lip -S Line (mm) 7.6 6.3 2.6 3.8 0.0 0.0 2.0 2.0 Pre 92.3 84.6 7.6 80.6 24.7 12.8 61.0 Post 84.4 79.8 4.6 76.1 24.7 14.5 64.4 A.A.Norm 85.0 81.0 4.0 76.0 32.0 14.0 67.0 119.0 122.0 22.0 25.0 2.0 2.0 2.0 -1.0 51.0 Dev 4.0 4.0 2.0 4.0 5.0 3.0 3.0 2.0 4.0 2.0 2.0 2.0 2.0 2.0 1.0 2.0 Fig. 9 Age: 16y 4m • Date: Pre Tx : 2-23-2015 • Post Tx: 1-6-2017 • Jackson Basic Analysis Diff 0.6 -0.0 1.3* 0.0 -1.5 0.2 -0.9 -2.9** 2.3** -2.5** 3.6*** 1.0* 4.1**** -1.4* 2.8** 14.9****** 115.4 126.3 125.6 131.1 16.9 40.0 6.0 15.0 -1.4 3.1 90.0 17.0 32.1 4.1 10.2 -0.8 1.8 80.8 Active treatment time was 14 months. Analysis The patient started with a Class I Maloclussion with moderate to severe spacing in the mandible and the maxilla. Post treatment cephla-metric x-ray and final tracing revealed that the inter-incisal angle was corrected to 126.3 degrees, which significantly improved the patient’s over jet and over bite. The Wits also was treated to a 1.8, which is within the normal means. (Figs. 8-9) Post treatment panoramic x-ray revealed final tracing and normal 1.3* 1.9* www.orthodontics.com Fall 2019 39
Journal of the American Orthodontic Society Fall 2019: Page 39
