Which of the Following Is True Regarding Trimming of Models

question 23

Multiple Choice

Which of the following is true regarding trimming of models with a model trimmer?

• A) The occlusal plane should be perpendicular with the base.
• B) Bases and anatomic portions should be soaked for 5 to 10 minutes before trimming.
• C) The anterior portion of both the maxillary and mandibular arch models should be trimmed to a point at the midline.
• D) The casts should be trimmed so that proportionately the base makes up one third and the anatomic portion two thirds of the total depth.

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Definitions:

Refractory Period

Period following effective stimulation during which excitable tissue, such as heart muscle, fails to respond to a stimulus of threshold intensity.

Cardiac Muscle

Muscle tissue found only in the heart, characterized by its ability to contract involuntarily and rhythmically.

Tetanic Contractions

Sustained muscle contractions that occur when the muscles do not relax between stimuli, leading to a smooth and steady contraction.

Depolarization

The process in which a cell's membrane potential becomes less negative, leading towards an action potential in nerve and muscle cells.