Diameter Non-atrophic
mandibles
Atrophic
mandibles
Mean (SD),
mm
Mean (SD),
mm
AP righta 4.4 (0.92) 3.16 (0.72)
AP lefta 4.23 (1.13) 3.21 (0.81)
LL right 3.46 (0.73) 3.41 (0.81)
LL left 3.5 (0.61) 3.18 (0.91)

aStatistically significant at level P < 0.0001 (t-test).
AP = antero-posterior distance; LL = latero-lateral distance; SD = standard deviation.