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Porcelain
Fused to Metal
& All-ceramic
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Steps
to Success
Impressioning - Prep Design
- Shade
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Porcelain fused-to-metal restorations can achieve the most natural and aesthetic results when the preparation allows sufficient space for both the internal metal substructure and the external build-up of multiple, porcelain layers. The versatility of high quality ceramics in a master ceramist’s hands allows precision shade matching and the recreation of natural aesthetic
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characterizations including cracks,
deep internal colorations, opacities, light and dark zones, areas of increased or decreased translucence, and chroma and value variations to list a few. Patient satisfaction is high when the available tools, such photography and models, are properly utilized by the practitioner and laboratory in a cooperate effort to maximize the full technical and aesthetic potential of the porcelain system. |
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Halo Opal PFM Bridge
- 4 units, fabricated
by Killian Dental Ceramics |
Reducing
Interferences
One of the laboratory's greatest challenges is fabricating a restoration free of lateral and protrusive interferences, without the benefit of equilibrated full-arch models mounted on a fully adjustable articulator.
To reduce occlusal interferences on restorations fabricated with quadrant models, the technician must inspect the models for clues of excursive movements visually coded in the wear facet patterns. If wear facets can be identified, then the technician endeavors to manually simulate the mandibular movements to eliminate interferences with the restoration. However, in the absence of cuspid and anterior model contours, an overly aggressive effort by the technician to eliminate all possible interferences can cause the removal of important cusp structure.
When taking a quadrant impression, minimally include the cuspid, and usually, it is best to take the impression to the midline. The anterior teeth contours along with the guidance and wear patterns of all the teeth will help the technician to reduce interferences while retaining the important contours and cusp lengths of the restoration.
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Aesthetic
Porcelain Margin
- 1.5 mm for porcelain facings (0.5 mm for metal lingual). |
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Shade
Communication
Position the shade tab so that it is visible in the photo with the tooth and/or prep. The incisal edge of the tab should be edge to edge with the incisal edge of the tooth. The tab should be in the same plane as the tooth (equidistant from the flash) so that the flash illuminates both the tooth and the tab equally. Send us your undeveloped 35-mm roll of film and we will develop and return your slides or photos with a new roll of film. If you have a digital camera, then you may send a picture file on diskette, or as an e-mail attachment send to:
Nothing communicates shade and characterizations better than photographs.. |
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