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. Author manuscript; available in PMC: 2009 Apr 16.
Published in final edited form as: Angle Orthod. 2008 Sep;78(5):873–879. doi: 10.2319/082907-399.1

Table 3.

Differences between Angular Measurements (degrees) from Three Imaging Modalitiesa

Conventional – Orthogonal CBCT
 Perspective CBCT – Orthogonal CBCT
 Perspective CBCT – Conventional
 MANOVA
Measurementb Mean SD % Within ±2° Mean SD % Within ±2° Mean SD % Within ±2° P > F
SNA 0.91 3.06 61% 0.35 3.31 55% −0.56 2.31 68% .1932
SNB −0.37 1.55 84% −0.48 1.67 84% −0.11 1.52 87% .2701
FMA 4.09* 3.43 16% −0.27 2.27 68% −4.36* 3.84 16% <.0001
USN −1.29 7.49 29% −0.35 6.66 32% 0.94 5.23 42% .5488
LMP −0.46 3.82 39% −1.05 2.96 52% −0.58 3.74 48% .1718
a

Conventional indicates conventional cephalograms adjusted for magnification; perspective CBCT, synthesized cone-beam CT cephalograms with perspective projection adjusted for magnification; orthogonal CBCT, synthesized cone-beam CT cephalograms with orthogonal projection.

b

SNA indicates sella-nasion-A; SNB indicates sella-nasion-B; FMA, Frankfort-mandibular plane angle; USN, upper incisor-sella/nasion; LMP, lower incisor-mandibular plane.