The Ness Visual Dictionary of Dental Technology
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| Term | butt margin |
| Variations | shoulder preparation |
| See also | porcelain butt margin, chamfer preparation, feather preparation, bevel preparation, butt joint |
| Definition | 1. A preparation where the axial wall is cut back from the gingival margin, leaving a shelf at approximately 90° from vertical. 2. A porcelain to metal restoration with the porcelain extending all the way to a shoulder preparation, leaving no exposed metal. |
butt margin
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