INBDE (Integrated National Board Dental Examination) Practice Exam

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Max first premolar is distinguishable from the max second by:

  1. Unsymmetrical crown and longer central groove

  2. Symmetrical crown and shorter central groove

  3. Unsymmetrical crown and shorter central groove

  4. Symmetrical crown and longer central groove

The correct answer is: Unsymmetrical crown and longer central groove

The max first premolar can be distinguished from the max second premolar because it has an unsymmetrical crown and a longer central groove, while the max second premolar has a symmetrical crown and a shorter central groove. This is due to the different functions of these two teeth - the max first premolar is used for breaking down food while the max second premolar is used for grinding food. Therefore, the differences in crown symmetry and central groove length allow for more efficient food processing. The other options are incorrect because they do not accurately describe the anatomical differences between the two premolars. Option B incorrectly suggests that both premolars have a symmetrical crown, while option C incorrectly suggests that both premolars have a shorter central groove. Option D also incorrectly suggests that both premolars have a longer central groove.

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