Gonial Angle Characteristics of Class III Malocclusion in Javanese Ethnic

Abstract

Objective: To describe the gonial angle characteristics in class III skeletal malocclusion in Javanese ethnic. Material and Methods: Pretreatment lateral cephalometric radiographs of 43 Javanese ethnic patients were measured: upper (Go1) and lower gonial angle (Go2), anterior (AFH) and posterior face height ratio (PFH), maxilla-mandibular length difference, mandibular plane angle (FMA), Y axis, ramus position, ANB angle, posterior cranial base/ramus height and mandibular body length/anterior cranial base. The relation between Go1, Go2 and other variables were analysed using correlation and regression analysis. Results: The total gonial angle is within normal range, but Go1 is below normal and Go2 is above normal. There is no difference between male and female gonial angle measurements (p=0.939 and p=0.861, respectively). Ramus position is positively correlated to Go1 (p=0.003), while AFH (p=0.000), maxilla-mandibular length difference (p=0.000), FMA (p=0.000), Y axis (p=0.000), and posterior cranial base/ramus height (p=0.018) are positively correlated to Go2. PFH is negatively correlated to Go2 (p=0.018). Conclusion: The upper gonial angle is influenced by the position of mandibular ramus, while the lower gonial angle is affected by the posterior and anterior lower facial height and mandibular size and rotation. Javanese with class III malocclusion tends to have hypodivergent facial type, with more posteriorly located mandibular ramus and excess mandibular length.

Regression models of teleradiographic parameters according to the Jarabak method in young men and young women with orthognathic occlusion

“…The authors of the study did not find a difference in the values of the gonial angle between men and women (p=0.939 and p=0.861, respectively). A negative correlation of PFH with Go2 (p=0.018) and a positive correlation of the position of the mandibular branch and Go1 (p=0.003) were established [4].…”

Metode Pengukuran Sudut Gonial Antar Pola Vertikal Skeletal Pada Sefalometri Lateral

“…1,2 Sudut gonial berkorelasi secara signifikan dengan tinggi wajah. 3 231 divergensi mandibula yang berhubungan langsung dengan pola vertikal skeletal. 4 Pola vertikal skeletal dibagi menjadi tiga kategori berdasarkan besar dari sudut bidang mandibula Steiner (SN-GoGn) yaitu, hypodivergent (< 28˚), normodivergent (28˚-36˚), dan hyperdivergent (> 36˚).…”

“…10 Gambaran sefalometri lateral merupakan gambaran radiografi standar dalam perawatan ortodonti, yang memberi informasi tentang konfigurasi vertikal dan anteroposterior dari skeletal wajah. 3 Analisis sefalometri pada gambaran sefalometri lateral dengan menggunakan panduan landmark pada titik anatomi tertentu dilakukan untuk mengetahui hubungan dental dan skeletal terhadap standar normal pada populasi tertentu. 6 Beberapa landmark sulit untuk direproduksi karena superimposi menghambat identifikasi landmark tertentu.…”