Before trimming teeth on a stone cast for an immediate denture, how far above the FGM should a line be marked?

Marking a line 3 mm above the gingival margin (FGM) on a stone cast prior to trimming teeth for an immediate denture is crucial for ensuring the appropriate support and aesthetics of the denture. This distance allows for the necessary adjustment to accommodate the contours of the soft tissues after extraction, as well as to ensure that there is sufficient space for the final prosthetic work without compromising the overall fit and appearance.

Moreover, this 3 mm elevation helps in managing the potential reduction in vertical dimension that can occur post-extraction, as well as allowing for adjustments that may be necessary due to the changes in the oral environment after tooth removal. The choice of this measurement is based on clinical experience and anatomical considerations that provide a balance between maintaining adequate tooth structure and achieving a natural appearance in the immediate denture.

In contrast, marking a line too close to the FGM, such as at 1 mm or 2 mm, may risk encroaching on the alveolar ridge and not providing enough clearance for the soft tissue, which could lead to complications such as sore spots or inadequate support. Similarly, marking too high, like at 4 mm, might lead to unnecessary trimming of crucial tooth structure, affecting the overall aesthetics and function of