1.
larger of deciduous molars
2.
crown of both upper + lower is smaller of that of the first molar
3.
has occlusal surface arranged as four cusps
4.
mesial + distal edges are raised as marginal ridges
5.
uppers have three roots arranged as for first molar + sometimes curves distally
6.
lower has two roots, arranged as for first molar + sometimes curves distally
7.
furcation area present in both
8.
function as for first molar
9.
root apices of upper can also lie close proximity to the floor of the maxillary antrum