Cr own 3) proximal sur face a. quadr angle b buccal cusp longer and more pointed than lingua l one C mes i al marginal groove and mes i a deve l opment l depression d straight axis
Crown 3）proximal surface a. quadrangle b.buccal cusp longer and more pointed than lingual one c.mesial marginal groove and mesial developmental depression d.straight axis
Cr own 4)occlusal aspect a. hexagon: shorter and nar rower mes iodistal ly b cusp r idges and marg ina ridges: c. buccul cusp distal ly: ong and pointed I inga cusp mes ial ly: short and flat
Crown 4）occlusal aspect a. hexagon:shorter and narrower mesiodistally b.cusp ridges and marginal ridges: c.buccul cusp distally:long and pointed lingual cusp mesially:short and flat
Cr own d. fossa e developmenta groove
Crown d.fossa e.developmental groove
Root flat. bi fur cated common (80%) tip of the root di ly b i furcated: bucca root arger and longer single: groove found
Root flat，bifurcated common （80%） tip of the root distally bifurcated:buccal root larger and longer single: groove found
Premo ar 2. maxillary second premolar 55 Resemb le the maxillary first premo I ar s less angular more rounded. smaller
Premolar 2.maxillary second premolar 5 5 Resemble the maxillary first premolars less angular ,more rounded,smaller