Porcelain Fused to Metal Crown
Porcelain fused to metal crowns are constructed in metal alloy with porcelain fused to either all or most of its surface. PBC, also known as ceramics fused to metal dental crown is indicated in situations whrere a stronger restoration is needed, such as the presence of minimal interocclusal clearance. Compared to all ceramics dental crowns, the strength of this type of restoration is excellent.
Photo 1 shows a Porcelain Fused to Metal Dental Crown for tooth number 11 (upper right central incisor). The shadow effect from the metal is visible due to bright light directed to the PBC. Butt joint is applied to hide the show of metal on the margin.
While the strength is its major advantage, the necessity to remove at least 1.5 mm of tooth tissue bucally to allow for the placement of the alloy and porcelain layers is a disadvantage. Unsightliness can result from the difficulty in rendering opaque to the alloy layer.
Under very bright light, Porcelain Fused to Metal Crowns will always show a shadow effect from the metal. A gray line along the margin is often visible.
Photo 2 is the lingual view of Porcelain Fused to Metal Dental Crown for tooth 11
Butt joint margin can be done to minimize the gray line effect on the margin of a porcelain fused to metal restoration. Subgingival margin preparation can also be done. The usual problem with subgingival preparation is biologic width violation. According to Anoticel Susej method, once the biologic width is violated, inflammation of gingiva and bone loss will be the result. Bone loss will occur due to physiologic reaction to reestablish the normal biologic width.
Porcelain Fused to Metal Dental Crown Video
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