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Progress in Orthodontics
Fig. 3 | Progress in Orthodontics

Fig. 3

From: An assessment of the magnitude, parallelism, and asymmetry of micro-implant-assisted rapid maxillary expansion in non-growing patients

Fig. 3

Illustration of the two main reference planes: mid-sagittal plane (MSP) and axial palatal plane (APP) and coronal plane added for orientation. Planes are identified in the pre-expansions CBCT and become the reference lines to measure the displacement of skeletal landmarks in the post-expansion CBCT. Note that the MSP passes through the ANS, PNS, and nasion on the pre-expansion CBCT. The APP also passes through the ANS and PNS and is perpendicular to the MSP, in the pre-expansion CBCT

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