California Registered Dental Assistant (RDA) Written Practice Exam

The correct choice is to begin trimming the maxillary model first. This approach is widely practiced for several reasons. When trimming dental models, starting with the maxillary model provides a stable reference because it is usually less complex than the mandibular model.

Trimming the maxillary model first allows for better control and precision, which is essential for accurate occlusal relationships. Additionally, once the maxillary model is completed, it can be used to position and align the mandibular model correctly during trimming. By establishing a solid foundation with the maxillary model, discrepancies in occlusion can be minimized, resulting in a more accurate final setup.

Ultimately, this method ensures better outcomes in terms of fit and function for prostheses or orthodontic applications, reinforcing the importance of this step in dental model preparation.