Perubahan Konveksitas Skeletal Wajah setelah Retraksi Anterior dengan Pencabutan Empat Premolar Pertama

Abstract

The purpose of this study was to evaluate the changes of the skeletal convexity represented by angle of convexity (NAPog angle) as described by Down’s and by convexity of point A (distance of point A to NPog line) as described by Ricketts, having orthodontic treatment with four first premolars extractions at The RSGMP, University of Sumatera Utara. The sample of this research was 9 patients with Class I bimaxillary protrusion malocclusion. Ages were more than 16 years old. The lateral cephalometric radiograph taken before and after anterior tooth retraction and measured. Paired t -test was used for quantifiying. The result of the study showed that there were changes at skeletal convexity but statistically there were no significant changes according to the two parameters.

Tujuan penelitian ini adalah untuk mengevaluasi perubahan konveksitas skeletal wajah yang ditentukan berdasarkan parameter angle of convexity menurut Down (sudut NAPog) dan convexity of point A menurut Ricketts (jarak linier titik A ke NPog), dengan pencabutan empat premolar pertama di RSGMP, Universitas Sumatara Utara. Subjek penelitian terdiri dari sembilan sampel dengan maloklusi Klas I protrusi bimaksila, usia diatas 16 tahun. Data diperoleh dengan cara penapakan sefalogram lateral sebelum perawatan dan setelah selesai retraksi gigi anterior. Hasil pengukuran diolah secara statistik dan dilakukan uji-t berpasangan. Hasil penelitian menunjukkan ada perubahan konveksitas skeletal wajah tetapi secara statistik tidak bermakna berdasarkan kedua parameter.