Practice Quiz

ADA NBDHE Dental Hygienist

Category - Provision of Clinical Dental Hygiene Services

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For a study cast to be acceptable, the posterior borders should meet which criteria? Choose all that apply.
  1. Form right angles with the base
  2. Parallel to the median line from the incisors
  3. Perpendicular to the middle of the tongue
  4. None of the above
Explanation
Answers: A, B, and C - For a study cast to be acceptable, the posterior borders should meet the criteria of forming right angles with the base and being perpendicular to the middle of the tongue.
When the posterior borders are in accurate proportion, the study models will occlude naturally when stood on the end of the posterior borders. . I know that I wasn’t hired for content but this explanation is wordy and confusing.
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