Barreled in Furcations.
I learned this early in my career from Bill Strupp, Daniel Melker, and Richard Rasmussen.
Lab Protocol: Follow the contours of the prepared teeth eliminating a height of contour over the furcation up to the occlusal table.
This creates a more cleanable restoration.
Fat contours over furcations prevents proper cleaning and thus plaque development.
This results in further tissue and bone loss.
Fat crowns die, skinny crowns live forever!