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Friday 6 September 2013

Tooth morphology

Questions
Answers
The most primitive cusp of the permanent maxillary first molar is the
Mesiopalatal cusp
The outline of the root trunk of permanent maxillary first molar reminds of the _________________ stage of human tooth evolution.
Tritubercular. Both the root trunk and the stage are triangular.
The occlusal table of permanent maxillary first molar is made up of
2 major and 2 minor fossa. The major fossa (central, distal) and minor (mesial triangular and distal triangular)fossa. In a permanent mandibular first molar it is 1 major fossa (central fossa) and 2 minor fossa (distal and mesial fossa)
In the permanent mandibular first molar, the mesiobuccal developmental groove  separates the
Mesiobuccal lobe and distobuccal lobe. The distobuccal developmental groove separates distobuccal lobe from distal lobe.
Tubercle of Zuckerland is associated with
Deciduous maxillary first molar. It is a tubercle found in the deciduous maxillary first molar on the facial or the buccal aspect near the cervical ridge.
In a normal permanent maxillary central incisor, incisal surface inclines cervically from the labioincisal edge to the palatoincisal edge by an angle of
45 degrees
A typical human permanent maxillary lateral incisor is positioned by an angle of ______ degrees to the occlusal plane.
65
A typical human permanent maxillary lateral incisor is positioned by an angle of ______ degrees to the mid saggital plane.
10
In human permanent dentition, the teeth that exhibit a bilateral symmetrical form from facial aspect is
Mandibular central incisor. Maxillary central incisors have a rounded distoincisal angle and sharp mesioincisal angle. Maxillary canine have unequal slopes. Mandibular lateral incisor towards the distal side has a slope.
The ridge that provides centric stops for opposing cusps is the
Marginal ridge

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