INBDE (Integrated National Board Dental Examination) Practice Exam

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Why is the master cast slightly carved around vibrating line?

To improve fitment of dental devices
To make up for polymerization shrinkage
To adjust for dental impression inaccuracies
For aesthetic purposes

The correct answer is: To make up for polymerization shrinkage

The master cast is slightly carved around the vibrating line to compensate for the polymerization shrinkage of the dental material. This shrinkage can cause the dental devices to have a less accurate fit, so carving around the vibrating line helps to improve the fitment of these devices. Options A, C, and D are all incorrect because they do not address the main purpose of carving around the vibrating line, which is to compensate for shrinkage. Option A is incorrect because improving fitment is the ultimate goal, not the reason for carving. Option C is incorrect because it suggests that the carving is done to adjust for inaccuracies in the impression, which is not the case. And option D is incorrect because aesthetics are not the primary reason for carving around the vibrating line.