Purpose: The aim of the study was to introduce a new cephalometric parameter, the MSG angle; and to assess the effectiveness of the MSG angle to diagnose the vertical skeletal discrepancy of the face.
Methods: One hundred and fifty pretreatment Lateral Cephalometric Radiographs (LCRs) of patients between 14 to 35years (Mean ± SD: 19.6 ± 4.93) were included. Based on the FMA, Sn-Go-Gn, and R - angle, all the LCRs were subdivided into three groups: low angle (28 female and 22 male); average angle (29 female and 21 male); and high angle (27 female and 23 male), with 50 samples in each group. The MSG angle was constructed using sella (S), M-point (centroid of the premaxilla), and G-point (centroid of the mandibular symphysis), and the center of angle is formed at the S point.
Results: The mean and standard deviation for the MSG angle were calculated in all three groups. The one-way analysis of variance (ANOVA) and Tukey post hoc test were used to determine whether there was a significant difference among the mean values of the MSG angle. The unpaired t-test showed no statistically signiﬁcant differences in the mean values of the MSG angle between males and females.
Conclusions: The MSG angle was introduced to assess the vertical skeletal discrepancy. A new cephalometric parameter, the MSG angle between 21 to 24 degrees, indicates an average angle; an angle less than 21 degrees can be considered a low angle, and an angle greater than 24 degrees indicates a high angle.
Khan, Mahamad Irfanulla and Neela, Praveen Kumar
"A New Cephalometric Innovation for Assessing Vertical Skeletal Discrepancy: the MSG Angle,"
Taiwanese Journal of Orthodontics: Vol. 34:
3, Article 1.
Available at: https://www.tjo.org.tw/tjo/vol34/iss3/1
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