Abstract:
: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 mum. The median gap widths were 87 mum at the midaxial wall, 167 mum at the axio-occlusal transition of the abutments, and 170 mum 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 mum), the values obtained were clinically satisfactory and showed that semisintered zirconia blanks could be used for the fabrication of four-unit FDPs.
journal_name
Eur J Oral Scijournal_title
European journal of oral sciencesauthors
Reich S,Kappe K,Teschner H,Schmitt Jdoi
10.1111/j.1600-0722.2008.00580.xsubject
Has Abstractpub_date
2008-12-01 00:00:00pages
579-84issue
6eissn
0909-8836issn
1600-0722pii
EOS580journal_volume
116pub_type
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journal_title:European journal of oral sciences
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