What is a key factor in achieving the proper contour of interim restorations?

Achieving the proper contour of interim restorations is primarily about ensuring that the restoration aligns well with the external surface of the tooth. When a restoration is properly contoured, it not only fits the tooth precisely but also mimics the natural anatomy, providing adequate occlusion and contact with neighboring teeth.

This alignment is essential for the function and aesthetics of the restoration. A well-contoured interim restoration contributes to proper tooth function, prevents food impaction, and helps maintain the health of surrounding tissues. Thus, focusing on the external tooth surface ensures that the restoration adheres to the desired dimensions and overall morphology required for optimal performance during the interim period.

While color, cement consistency, and the type of armamentarium may play roles in different aspects of dental procedures, they are not as directly relevant to the contour of the interim restoration as alignment with the tooth's external surface.