Dental morphology of 45,XO human females: molar cusp area, volume, shape and linear measurements.
A three-dimensional analysis of the maxillary first molars of five 45,XO females and comparison with normal females and males demonstrated a reduction of cusp areas and volumes in the 45,XO females. Mesiodistal and faciolingual dimensions were also reduced. The reductions in basal area and volume were greater in the later developing, distal cusps. In normal females the second X chromosome apparently does not exert an effect on the cusp height but increases the basal area. The results further indicate that the Y chromosome in normal males increases both cusp height and basal area. The steepest cusps were found in 45,XO females while the shallowest were in the control males. Both sex chromosomes thus seem to affect the shape of the cusp but the resulting phenotypes differ.
Mayhall
J T
JT
Faculty of Dentistry, University of Toronto, Ontario, Canada.
Alvesalo
L
L
D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla; D008963:Molar / Q000002:abnormalities* / Q000033:anatomy & histology*; D015999:Multivariate Analysis; D009811:Odontometry; D012727:Sex Characteristics; D014071:Tooth Abnormalities / Q000235:genetics*; D014424:Turner Syndrome / Q000473:pathology*; D014960:X Chromosome / Q000502:physiology