lateral cephalometry

Question 1

indications of lat ceph

Answer 1

1. orthodontics
   - diagnosis
   - evaluate growth
   - treatment plan
   - treatment process
   - treatment outcome
2. orthognatic
   - pre op
   - treatment plan
   - post op

Question 2

properties of lat ceph radiograph and their significance

Answer 2

• fixed source to receptor distance (1.5m to 1.8m) –> reduce magnification and increase reproducibility
• identify and trace landmarks
• identify relationship of:
  –> max and mand to cranial base
  –> max and mand
  –> incisor inclination
  –> soft tissue profile

Question 3

technique of lat ceph

Answer 3

• position patient in cephalostat
• patient mid sagittal plane is vertical and parallel to image receptor
• patient frankfurt plane is horizontal
• patient to bite back teeth tgt
• immobolise head with ear rods and nasion support