In designing RDPs, which concept is not essential when using a surveyor?

In the context of designing removable partial dentures (RDPs) with the aid of a surveyor, it's important to understand that certain concepts are critical for ensuring proper fit and function of the prosthetic. Among the options presented, the idea that proper lateral tilt allows for slightly greater undercuts unilaterally is not essential in the fundamental design process when using a surveyor.

The lateral tilt observed during the surveying process can reveal undercut areas that may be beneficial for retention in specific situations; however, the primary goal is to achieve a balanced approach to both anterior-posterior and lateral tilts to ensure that the RDP conforms to the anatomical contours of the residual ridges. Unilaterally relying on lateral tilt to create increased undercuts might lead to complications such as stress concentrations, uneven distribution of forces, and potential compromise of the prosthesis's stability and retention.

In contrast, the other concepts mentioned—starting with the occlusal plane parallel to the deck, adjusting anterior-posterior tilt before lateral tilt, and marking heights of contours with a graphite rod—are essential procedures for achieving an optimal fit and function in RDP design, as they help establish a baseline for proper alignment and support. Ensuring that these factors are