What term refers to the surface form in contact with the edentulous ridge area?

The term that refers to the surface form in contact with the edentulous ridge area is the tissue surface form (TSF). In prosthetic dentistry, particularly in the design and fitting of dentures, the tissue surface form is crucial as it directly interfaces with the soft tissues of the oral cavity where the denture sits. This surface needs to be carefully shaped and contoured to ensure proper fit, comfort, and stability of the prosthesis on the underlying ridge, which is devoid of teeth.

The importance of the TSF lies in its role in distributing occlusal forces evenly across the edentulous ridge, minimizing tissue irritation, and enhancing the retention of the prosthetic device. A well-designed TSF will conform to the anatomical landmarks and contours of the ridge, promoting better adaptation and function.

In contrast to the tissue surface form, other terms mentioned do not describe the interface with the edentulous ridge as effectively. External surface form refers to more general surface features that might not be in contact with the tissues. Similarly, the external contour of the crown or fixed dental prosthesis pertains to the visible aspects of dental restoration above the gum line. Internal surface structure generally relates to the components within the prosthesis itself, which does not directly interact with the