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# Rest Seat Preparations Rest seat preparations should be made in sound enamel and should follow preparation of proximal tooth surfaces to eliminate undesirable undercuts. Occlusal rest seats in sound enamel can be prepared with burs and polishing points that leave the enamel surface smooth as the...

# Rest Seat Preparations Rest seat preparations should be made in sound enamel and should follow preparation of proximal tooth surfaces to eliminate undesirable undercuts. Occlusal rest seats in sound enamel can be prepared with burs and polishing points that leave the enamel surface smooth as the original enamel. A larger round bur is used first to lower the marginal ridge and outline the form of the rest seat. A slightly smaller round bur is then used to deepen the floor of the occlusal rest seat and shape it into a spoon shape. Smoothing is done with a polishing point of suitable size and shape. Fluoride gel should be applied to abutment teeth after enamel recontouring. Occlusal rest seat preparations in existing restorations may be widened to compensate for shallowness, but the floor of the rest seat should still be slightly inclined apically from the marginal ridge. If this is not possible, a secondary occlusal rest can be used on the opposite side of the tooth to prevent slipping. Occlusal rest seats in new restorations, crowns, and inlays should be prepared so that sufficient clearance may be provided for the rest seat within preparation. Adequate occlusal reduction should be made to accommodate the depth of the rest seat in the abutment crown.