HESI General Chairside Assisting Practice Exam

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When fabricating a mandibular model using the inverted-pour method, how much plaster should be used?

100 grams
150 grams
200 grams
250 grams

The correct answer is: 150 grams

When fabricating a mandibular model using the inverted-pour method, the recommended amount of plaster to use is 150 grams. This specific quantity is crucial for ensuring that the model has the appropriate density and strength. The inverted-pour method relies on creating a precise and stable model, which can be adversely affected if the plaster amount is insufficient or excessive. Using 150 grams allows for optimal coverage of the dental impression, providing a good balance of material that achieves the desired detail without compromising the structural integrity of the finished model. This careful measurement helps in minimizing the risk of breakage and ensures that the details from the impression are accurately replicated.