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75.Which cusp of the maxillary molar is NOT part of the trigon (primitive cusp triangle)?

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A. Mesiolingual    B. Mesiobuccal
C. Distolingual     D. Distobuccal

ANS> C. In evolution, three cusps of the maxillary molar are considered to be the 
primary cusp triangle, and the original three cusps of the evolving molar. They form the trigon, and are 
the MB, ML, and DB cusps. The fourth cusp, the DL, is the smallest, is considered to be a minor cusp, 
and is known evolutionarily as the talon, or talon cusp. This cusp is less conspicuous as you go from 
first to second to third maxillary molar. 
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