dev of occl

gum pad: birth to 6-7mo
prim dent: until age 6
mixed dent: until last deciduous tooth leaves
perm dent: adult

amt of vertical coverage of mand teeth by max

vary from edge-edge to 40%

horizontal distance between max and mand teeth

vary from 0-4m

30mo

centrals, laterals, 1m, k9, 2m

usually seen and desirable to make room for perm dent

yes bc interarch relationship of prim dent is edge to edge

based on relationship between 2m in sagittal plane: flush terminal plane, mesial step, distal step

flush or 1mm+ mesial step

2Ms are in line with each other

mandibular 2M more mesial than max 2m

mand 2m more distal than max 2m

trauma, supernumerary, early loss of primary tooth with scar tissue

6

premature loss of primary canine
loss of space for perm canines

diff between MD widths of primary canines,1m 2m and MD width of successors

diff should be POSITIVE! accomodates size of perma teeth

max 1.3mm
mand 3.1mm

molar, helps attain class I

intercanine and intermolar width inc

dec slightly due to loss of leeway space and centrals uprighting