California Registered Dental Assistant (RDA) Written Practice Exam

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Where should you begin placing gypsum material in a mandibular impression?

  1. In the front tooth

  2. most posterior tooth

  3. On the lingual side

  4. In the tray center

The correct answer is: most posterior tooth

Beginning to place gypsum material in a mandibular impression at the most posterior tooth is important because it allows for the material to be evenly distributed and reduces the risk of air bubbles and voids in the impression. Placing it on the front tooth may result in uneven material distribution and an inaccurate impression. The lingual side may not provide enough support for the material and could result in distortion of the impression. Placing it in the tray center may also result in uneven material distribution and an inaccurate impression.

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