Diff. bet. mand. 1st and 2nd molar

[Dentstu]

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Which of primary grooves uniting in the distal pit on the occlusal surface of the mandibular 2nd molar represents the one that normally has no counterpart in distal pit of 1st molar ?

1. distolingual
2. distofacial triangular
3. distolingual triangular
4. distal marginal
5. distal portion of the central

Please anwser and explain.

 

[subh]

Ans : 5
correct me if i am wrong.

 

[BUSODM]

i think its distofacial triangular .correct me if i am wrong

 

[Dentstu]

i think its distofacial triangular .correct me if i am wrong

Yes you are right, would you please explain us ?

 

[docsmiley]

Yes you are right, would you please explain us ?

hi..its bcoz of the 3rd distal cusp on the fist molar...
anyone wit better ans pls explain...