Dental OSCE (Objective Structured Clinical Examination) Practice Exam

What is the main purpose of indexing a RPD cast?

1. Facilitates easy transport of the cast

2. Allows accurate reattachment of the cast in proper articulator mounting

3. Improves the aesthetic appeal of the denture

4. Reduces the time needed for the fitting process

The correct answer is: Allows accurate reattachment of the cast in proper articulator mounting

The main purpose of indexing a removable partial denture (RPD) cast is to allow for accurate reattachment of the cast in the proper articulator mounting. Indexing involves marking the position of the cast and its components to ensure that when the cast is removed and replaced, it can be aligned to its original position without discrepancies. This precise alignment is crucial for maintaining occlusion and ensuring that any adjustments made during the fabrication process do not alter the interarch relationship established in the initial impression. This method enhances the accuracy of the fitting and helps prevent potential errors that could arise if the cast were simply repositioned without clear guidance. Proper indexing is critical in achieving a well-functioning prosthesis that fits comfortably and functions efficiently in the mouth. While the other choices mention aspects that can be related to the RPD process, they do not address the specific purpose of indexing. For instance, while indexing can facilitate transport by providing a clear understanding of placement, its primary role is in ensuring accurate articulation. Similarly, aesthetics and fitting times are important considerations in RPD creation but are not directly connected to the indexing process itself.