What is the most effective method for verifying adequate occlusal clearance for an onlay preparation?

The most effective method for verifying adequate occlusal clearance for an onlay preparation is a wax bite chew in. This technique involves placing a wax sheet in the patient's bite and asking them to bite down. The impression left in the wax allows the practitioner to visibly assess the amount of occlusal clearance available for the restoration, accurately revealing how well the proposed onlay will fit in the patient's occlusion.

Using this method provides a dynamic assessment that highlights potential interference or contact points that might not be obvious through other means. It ensures that there is sufficient space to accommodate the thickness of the onlay material and helps avoid issues with occlusion after the onlay is placed.

Other methods, such as proper depth cuts or visual inspections, do not offer the same level of confirmation as they may not interact with the patient's occlusion in a realistic manner. Likewise, while articulating paper can identify contact points, it is typically used after an onlay placement to check for interferences rather than verifying clearance during the preparatory phase. Therefore, the wax bite chew in is the preferred method for ensuring adequate occlusal clearance.