Molar Metal Ceramic Crown Preparation

To be successful a metal ceramic crown preparation requires more tooth reduction wherever the metal substructure is to be veneered with dental porcelain.

Molar metal ceramic crown preparation.

Most widely used. Complete coverage by metal. Ensuring the preparation has a 90 cavosurface angle helps to prevent unfavourable distribution of stresses and minimises the risk of the crown fracturing. Porcelain fused to metal pfm crowns are among the most popular and reliable restorations because of its durability and natural esthetics using a cast metal substructure that is veneered with porcelain this material closely mimics the appearance of a natural tooth.

To be successful a metal ceramic crown preparation requires considerable tooth reduction wherever the metal substructure is to be veneered with dental porcelain. Metal ceramic porcelain fused to metal 2 0 mm incisally 0 5 1 0 mm lingual aspect porcelain guidance requires greater clearance 1 5 mm labial shoulder or heavy chamfer 0 5 mm lingual chamfer 1 5 mm circumferentially for 360 degree ceramic margin. However sometimes the metal underlying the crown s porcelain can show through as a dark line especially. Because there is no metal to block light transmission they can resemble natural tooth structure better in terms of color and translucency than can any other restorative option.

Only with sufficient thickness can the darker color of the metal substructure be masked and the veneer duplicate the appearance of a natural tooth. The metal should be 0 3 to 0 5 mm thick if it is a noble metal alloy while a metal coping made of the more rigid base metal alloys can be thinner to 0 2 mm. Veneer porcelain mimics 3 extention varies natural teethnatural teeth 4. 11 tooth preparation for all ceramic restorations all ceramic inlays onlays veneers and crowns are some of the most esthetically pleasing prosthodontic restorations.

Full contour crowns metal or zirconia 1 0 mm non functional cusps 1 5 mm. To be successful a metal ceramic crown preparation requires considerable tooth reduction wherever the metal substructure is to be veneered with dental porcelain. Tooth preparation for metal ceramic crowns. The preparation must be designed to provide the correct support for the porcelain along its entire incisal edge unless an all ceramic crown with a strong core i e.

Next to all ceramic crowns porcelain fused to metal crowns look most like normal teeth. The extent of the veneer can vary.