Transverse Stability after RPE in y Cleft Palate Patients

Previous Study Methods
• Di Direct t measurements t on plaster l t casts t (Long et al. 1995)
– Prone to distortion when impressions are made
Onl er pted permanent 1st – Only erupted permanent 1 molars meas red
st molars measured
• Measurements on photographs (Ramstad et al. 1997)
– Sensitive to the angle and distance of camera
• Measurements on 2D projection images (Kindelan et al. 1999)
– Example: Lateral Head Films Films, Periapicals Periapicals, Occlusals
– Affected by variable magnification and
superimposition of structures
– Sensitive to orientation of patient
• Variable findings g of ppast studies may y be due to
poor imaging modalities