When recording jaw relation is difficult, non-anatomic teeth are preferred because their flat occlusal surfaces allow easier adjustment and reduce lateral interferences. This minimizes the need for precise bite registration and allows for a more stable, balanced occlusion even with less accurate jaw relations. In contrast, anatomic teeth require accurate jaw relation due to their cusped design, which can cause premature contacts and instability if not properly recorded. Thus, non-anatomic teeth provide greater flexibility and patient comfort in challenging jaw relation scenarios.

Reference: Complete Denture Prosthodontics, R.S. Shigli, 1st Edition.