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[Lubdub222]

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Which of the following molar roots is wide faciolingually and concave on both mesail and distal surfaces?

answer- mesial of mandibular first

Why is that? To me it looks convex on the mesial surface. Thank you.

 

[tinman831]

are you sure its not the MB root of the maxillary first?

 

[aphistis]

Tinman- The MB roots of upper first molars are generally conical +/- apical dilaceration, and the root surface doesn't typically exhibit any concavities.

Lubdub- The roots of lower first molars are frequently hourglass shaped in cross section. The concavity is oriented buccolingually, not occlusocervically.

 

[Lubdub222]

In an iideal intercuspal position, the DL cusp of max first molar, opposes the:

-- answer: mesial marginal ridge of the mandibular 2nd molar.

why not " lingual sulcus of 1st molar"??

 

[IndianGraduate]

because that would make it a class II and a cross bite situation.....
may be wrong...but im pretty sure thats it. answer is right though.