DA board question

[herasasil]

In the ideal intercuspal relation, the lingual cusp of the maxillary second premolar contacts the:
a.distal fossa of the mandibular second premolar
b.mesial marginal ridge of the mandibular first molar
c.distal marginal ridge of the mandibular second molar
d.distal marginal ridge of the mandibular first premolar

Whats the answer and why? its between choice A and B. I thought it was B but it says here its A from the study guide. What do you think?

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[superstar2008]

the answer is A. I got the answer from the decks. refer the occlusion section. feel free to correct me. thank you.

 

[passiondentistr]

hey the ans is B . for sure ....
acc to the rule , the supporting cusps has to contact the marginal ridges n lingual of max cusps are considered the working cusps.
I know many books do give distal fossa as the ans ...but i am sure B is the ans

 

[superstar2008]

Thank you passion. But, how do get rid of the confusion. coz the oclusion diagramwise your ans is right. But the decks says its the answer A. Please explain me. Thank you.

 

[passiondentistr]

I guess its given in wheelers .. n i confirmed this from a friend of mine studying at nyu too
Finally some confirmed conclusions !!