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Creugers NHJ, Mentink AGM et al Int J Prosthodont 2005; 18: 34–39

In this study, 127 cast palladium posts and cores were compared with 150 direct posts and cores and 42 all composite cores without posts. Patients had one or more endodontically-treated teeth needing crowns. The posts and cores were placed by 18 operators. The minimum height of dentine was prescribed for the trial as <75% 1 mm above gingival level and >25% less than 1 mm above, or without a collar of 1-2 mm.

During the study, there were 5 early failures and 10 later ones. The early failures were all root fractures originating from 2 operators. There were no significant differences between the 3 types of restoration, but survival was significantly better in teeth with substantial dentine height (>75% of minimum 1 mm thickness with a height of at least 1 mm above gingival level, and a collar of 1-2 mm) than in those with minimal height.