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Volume 27 , Issue 6
November/December 2007

Pages 567-575


Fit of All-Ceramic Posterior Fixed Partial Denture Frameworks in Vitro

Andreas Bindl, Dr med dent/Werner H. M÷rmann, Dr med dent, Prof


PMID: 18092451
DOI: 10.11607/prd.00.0769

The objective of this study was to evaluate, by scanning electron microscopy, the marginal and internal fit of all-ceramic three-unit fixed partial denture (FPD) frames fabricated by computer-assisted design/computer-aided machining (CAD/CAM) and CAM techniques using blocks of infiltration ceramic, high-strength yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) zirconia sinter ceramic, high-strength dense sintered Y-TZP zirconia ceramic, and glass ceramic. Slip-cast infiltration ceramic was used as a traditional control. The cementation interface widths of the FPD frame copings on butt (A) shoulders of Cerec In-Ceram zirconia (A1, 53 ▒ 17 Ám) were smaller than those of slip-cast In-Ceram zirconia (A6, 113 ▒ 25 Ám). Cerec Y-TZP zirconia (A2, 53 ▒ 9 Ám) and DCS Y-TZP zirconia (A4, 32 ▒ 6 Ám) interfaces were both significantly smaller than those of Cercon Y-TZP zirconia (A5, 120 ▒ 6 Ám). Internally, A2 (103 ▒ 14) interfaces were smaller than A4 interfaces (144 ▒ 15 Ám). On chamfer shoulders (B), Cerec Y-TZP zirconia (B1, 71 ▒ 5 Ám) interfaces were smaller than Cercon interfaces (B2, 129 ▒ 38 Ám); internally, B1 (80 ▒ 11 Ám) interfaces were smaller than B2 interfaces (130 ▒ 12 Ám). CAD/CAM produced better marginal and internal accuracy of fit compared to slip casting and CAM techniques. (Int J Periodontics Restorative Dent 2007;27:567ľ575.)


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