6533b862fe1ef96bd12c64d2

RESEARCH PRODUCT

Retentive strengths of cast gold crowns using glass ionomer, compomer, or resin cement

Elmar StenderNadja WenzlBrita WillershausenClaus-peter H. Ernst

subject

Dental Stress AnalysisMaterials scienceSurface PropertiesPolyestersGlass ionomer cementDental CementsComposite ResinsDental Prosthesis RetentionAdhesion strengthHumansComposite materialCementationResin cementCementPolycarboxylate CementCrownsCompomersSilicatesDental BondingAdhesivenessResin CementsDyract-cemGlass Ionomer CementsDentinGold AlloysMethacrylatesStress MechanicalZinc OxideOral SurgeryMagnesium Oxide

description

The retention forces of a newly developed compomer cement (Dyract Cem), a glass ionomer cement (Ketac Cem Aplicap), and a resin cement (F21) were examined.Cemented cast gold crowns were removed along the path of insertion with a Zwick universal testing device. The impact of both a cured and a noncured additional bonding layer that were applied to the inner surface of the crowns was examined across the Dyract Cem group.The mean adhesive strength was measured at 2.36 +/- 0.69 N/mm2 in the Ketac Cem group, at 0.60 +/- 0.28 N/mm2 in the F21 group, and at 1.85 +/- 0.94 N/mm2 in the Dyract Cem group, respectively. The application of an additional bonding layer to the inner surface of the crowns did not significantly improve the retentive strength of Dyract Cem; the respective mean strengths were observed at 1.46 +/-0.33 N/mm2 for the uncured and at 1.70 +/- 0.76 N/mm2 for the cured bonding layers.Dyract Cem and Ketac Cem showed significantly higher retentive strengths than F21 (p0.001, Wilcoxon test, 5% level). No significant difference was found in bond strength between Ketac Cem and Dyract Cem.

yearjournalcountryeditionlanguage
1998-05-12The Journal of Prosthetic Dentistry
https://doi.org/10.1016/s0022-3913(98)70164-7