Ct r own Occ lusa sur face d 2 fossa (by obl i que ridge) mesial (central) distal e3 deve l opmental groove
Occlusal surface d.2 fossa（by oblique ridge） mesial（central）、distal e.3 developmental groove Crown
Root 3 roots: 2 buccal, 1 inga l We divided Root trunk sturdy and short L>M-B>D-B
Root 3 roots： 2 buccal,1 lingual Well divided Root trunk sturdy and short L>M-B>D-B
oar 2. maxillary second molar 77 resemble the first one but smaller Narrower rhomb id
Molar 2.maxillary second molar 7 7 resemble the first one but smaller Narrower rhomboid