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This Concept Map, created with IHMC CmapTools, has information related to: FINAL Metal Coping Design FINAL, higher yield strength may be as thin as 0.2 mm, An outer junction of porcelain to metal that is at a right angle (90 degrees) to avoid subsequent fracture of the porcelain, Features to consider when designing the metal coping for a PFM restoration Thickness of the metal underlying and adjoining the porcelain, Thickness of the metal underlying and adjoining the porcelain may vary, contoured so that the overlying veneer will be subject to compressive, Porcelain-Metal Junction Line is Placed 1.0 mm from occlusal contacts at the position of maximal intercuspation, metal well away from Porcelain-Metal Junction Line, Occlusal Contacts placed on unveneered metal surfaces, areas with deficiencies caused by caries, tooth fracture, or previous restoration in the incisal edge, Metal that is contoured, Placement of ???? Proximal Contacts, more likely to produce porcelain crazing than an angle of 90 or 135 degrees., improved cosmetic effects metal is placed lingually, coping design must ensure an optimum bulk for rigidity, Thickness of the Porcelain Veneer the areas with deficiencies caused by caries, tooth fracture, or previous restoration, ALLOY SYSTEMS ???? a noble metal coping, vary depending on the configuration of the preparation, metal because glazed porcelain removes 40 times as much opposing tooth structure, unveneered metal surfaces because location and area covered by ceramic can be more precisely controlled, not exposed to any occlusal forces it is prone to premature failure