Clinical evaluations of cast gold alloy, machinable zirconia, and semiprecious alloy crowns: A multicenter study

Ji Man Park, Yong Shin Hong, Eun Jin Park, Seong Joo Heo, Namsik Oh

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Statement of problem Few studies have compared the marginal and internal fits of crowns fabricated from machinable palladium-silver-indium (Pd-Ag-In) semiprecious metal alloy. Purpose The purpose of this clinical study was to evaluate and compare the marginal and internal fits of machined Pd-Ag-In alloy, zirconia, and cast gold crowns. Material and methods A prospective clinical trial was performed on 35 participants and 52 abutment teeth at 2 centers. Individuals requiring prosthetic restorations were treated with gold alloy or zirconia crowns (2 control groups) or Pd-Ag-In alloy crowns (experimental group). A replica technique was used to evaluate the marginal and internal fits. The buccolingual and mesiodistal cross-sections were measured, and a noninferiority comparison was conducted. Results The mean marginal gaps were 68.2 μm for the gold crowns, 75.4 μm for the zirconia crowns, and 76.9 μm for the Pd-Ag-In alloy crowns. In the 5 cross-sections other than the distal cross-section, the 2-sided 95% confidence limits for the differences between the Pd-Ag-In alloy crowns and the 2 control groups were not larger than the 25-μm noninferiority margin. The control groups displayed smaller internal gaps in the line angle and occlusal spaces compared with the Pd-Ag-In crown group. Conclusion The marginal gaps of machinable Pd-Ag-In alloy crowns did not meet the noninferiority criterion in the distal margin compared with zirconia and gold alloy crowns. Nonetheless, all 3 crowns had clinically applicable precision.

Original languageEnglish
Pages (from-to)684-691
Number of pages8
JournalJournal of Prosthetic Dentistry
Issue number6
StatePublished - 1 Jun 2016

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© 2016 Editorial Council for the Journal of Prosthetic Dentistry


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