Clinical fit of four-unit zirconia posterior fixed dental prostheses.

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 Sci

authors

Reich S,Kappe K,Teschner H,Schmitt J

doi

10.1111/j.1600-0722.2008.00580.x

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

579-84

issue

6

eissn

0909-8836

issn

1600-0722

pii

EOS580

journal_volume

116

pub_type

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