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The purpose of this presentation is to discuss the principles of metal-ceramic crown preparations in the posterior region. The types of finish lines employed, chamfer, shoulder, and shoulder-bevel) are described in detail, the rationale for their use, as well as the affect each of these types of finish lines have on marginal adaptation. The margin designs (metal collar, metal thinned to a fine line, and porcelain) available are described in detail as well as the affect each of these on marginal adaptation. The impact of total occlusal convergence that can reasonably be achieved, even by the most experienced clinicians, is demonstrated. The limits of tooth reduction and the need for auxillary grooves to supplement resistance form is detailed. Finally the clinical steps employed in preparing posterior teeth for metal ceramic crowns is shown in detail, including a video demonstration.
What is the tapered finished line of the margin at the cervical area of a tooth preparation?Chamfer finishing line
A round- end tapered fissure bur is used to obtain this preparation margin. It provides adequate space at the cervical region so can make the contour of the crown restoration within the contour of natural tooth without overcontouring of the final restoration.
What is the term for a tooth root or implant used to support and retain a fixed or removable prosthesis?abutment: A tooth or implant fixture used as a support for a prosthesis.
What kind of prosthesis provides complete coverage of the anatomical portion of a tooth crown?The cast restoration covers all of the occlusal and a portion of the proximal surfaces. A single cast restoration that completely covers the anatomic portion of a tooth. The materials used to make crowns are; porcelain fused to metal (PFM), porcelain, or gold.
Which material is placed under a porcelain restoration to mask tooth discoloration?fixed prosthodontics. |