ArticleBioengineering (Basel, Switzerland)2026
Effect of Deep Margin Elevation on the Fracture Resistance of Maxillary Molar Zirconia Crowns.
Article in Bioengineering (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundThe purpose of this in vitro study was to evaluate the fracture resistance of maxillary molar zirconia crowns cemented with deep margins relocated with resin composite.
methodsA maxillary right first-molar typodont tooth was prepared for a complete-coverage zirconia crown and modified to have: (1-DME) a 3 mm deep and 3 mm wide box on the mesial margin; (2-DME) 3 mm deep and 3 mm wide boxes on both the mesial and distal margins; and (N-DME) no box modification. Before the first modification, 45 zirconia (4 mol% yttria) crowns were fabricated. The die was scanned before each modification to fabricate the corresponding 3D-printed dies (
resultsThe fracture resistance of maxillary molar zirconia crowns differed significantly among the groups. Group 2-DME demonstrated the highest mean fracture resistance (5370 N), followed by Group 1-DME (5083 N). The lowest mean value was recorded for the control group, N-DME (2961 N).
conclusionsZirconia crowns cemented on teeth with deep margin elevation exhibited higher fracture resistance than crowns cemented without deep margin elevation.
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