• iconIPU, AINRG, NECTEC, NSTDA, Thailand
  • iconpakorn.supanich@nectec.or.th

PA Analysis Section

Q: What would the result from PA analysis look like?
A: PA analysis would focus upon the facial asymmetry with 9 types of symmetry and 16 measurements to check whether the face is inclining more to the left or more to the right. Positive values in green implied that the face was leaning to the right while negative values in fuchsia implied that the face was leaning to the left depending upon the reference vertical line including:
  1. Cg perpendicular to Z Plane
  2. Middle point of Z-Plane to ANS
Q: Of the 9 types of symmetry analysis and 16 measurements for PA analysis, are details to be described?
A: The list for 9 types of symmetry analysis and 16 measurements for PA analysis are shown below.
Types of Symmetry Analysis Measurements for Symmetry
Cranial Base Vertical Lo-oL (LO to MSR)
ZF-FZ (Z to MSR - ZF)
Zg-Gz (ZA to MSR–Zg).
Cranial Base Horizontal Z Distance
ZA Distance
Maxillary Vertical J-J (J to MSR)
Maxillary Horizontal J Distance
Mandibular Vertical Ag-Ga (Ag to MSR)
CoL-CoR (Co to MSR)
Mandibular Vertical Ag Distance
Co Distance
Chin (the distance of the Chin)
Peerpendicular Distance from the Midline to Midline (Dental) right maxillary incisor to left maxillary incisor to Midline (Rt 11-21)
right mandibular incisor to left mandibular incisor to Midline (Rt 31-41)
Dental Height J Point to the Buccal for the first left and right maxillary molar (J – A6L, J-A6R)
Occlusal Plane Distance Cann Occlusal Plane (Cann Occl Pl)
Q: For the case of PA analysis, does any function save the PA analysis data in the same way as lateral cephalometric analysis having the function to save data for supereimposition?
A: CephSmile only saves PA landmarks and trace lines that can be opened again.