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Clinical fit of four‐unit zirconia posterior fixed dental prostheses
Author(s) -
Reich Sven,
Kappe Karsten,
Teschner Hubertus,
Schmitt Johannes
Publication year - 2008
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.2008.00580.x
Subject(s) - dentistry , cubic zirconia , dental prosthesis , replica , ceramic , molar , orthodontics , posterior teeth , materials science , biomedical engineering , medicine , composite material , surgery , implant , art , visual arts
The objective of this clinical study was to assess the internal and marginal accuracy of computer‐aided design/computer‐aided manufacturing (CAD/CAM)‐generated four‐unit all‐ceramic posterior fixed dental prostheses (FDPs). The data were compared with the results of three‐unit metal‐ceramic and all‐ceramic FDPs that were obtained in a previous study. Twenty‐four patients were provided with all‐ceramic posterior four‐unit FDPs made from semisintered blank zirconia material. Prior to definitive insertion the accuracy was evaluated using a replica technique with a light body silicone that was stabilized with a heavy body material. The replica samples were examined using microscopy. The median marginal gap of the 24 four‐unit FDPs was 77 μ m. The median gap widths were 87 μ m at the midaxial wall, 167 μ m at the axio‐occlusal transition of the abutments, and 170 μ m at centro‐occlusal location. Although the marginal accuracy of the four‐unit FDPs differed significantly from that of the three‐unit metal‐ceramic FDPs (median 54 μ m), the values obtained were clinically satisfactory and showed that semisintered zirconia blanks could be used for the fabrication of four‐unit FDPs.