The occlusion contact, which is engaged in many dental clinical scopes, is the primary subject in the field of dental occlusion. Prosthodontics is one of the fields that are involved in with this subject, including the static relation（the occlusal contacts in intercuspal occlusion） and the dynamic relation（such as that in chewing movement）. Not only the restorations, but also the abutments, that have to be properly managed to obtain a harmony occlusal contact relationship.
