1. Effect of Conditioning and Aging on the Bond Strength and Interfacial Morphology of Glass-ionomer Cement Bonded to Dentin
- Author
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Hoshika, S, De Munck, Jan, Sano, H, Sidhu, SK, and Van Meerbeek, Bart
- Subjects
Dental Stress Analysis/instrumentation ,Acrylic Resins/chemistry ,Glass Ionomer Cements/chemistry ,Tensile Strength ,Humans ,microtensile bond strength ,Dental Bonding ,Dentin-Bonding Agents/chemistry ,Temperature ,Water/chemistry ,Methacrylates/chemistry ,detin ,Time Factors ,adhesion ,Materials Testing ,Microscopy, Electron, Scanning ,glass-ionomer cement ,Microscopy, Electron, Transmission ,transmission electron microscopy ,Surface Properties ,Stress, Mechanical ,Resin Cements/chemistry ,Dentin/ultrastructure - Abstract
PURPOSE: To determine the bond stability and the change in interfacial ultrastructure of a conventional glassionomer cement bonded to dentin, with and without pretreatment using a polyalkenoic acid conditioner. MATERIALS AND METHODS: The occlusal dentin surfaces of 10 teeth were ground flat. Glass-ionomer cement was bonded to the surfaces either with or without polyalkenoic acid conditioning. The teeth were sectioned into 1-mm2 stick-shaped specimens. The 200 specimens obtained were randomly assigned to four groups with different periods of storage in water: 1 week, 1 month, 3 months, and 6 months. The microtensile bond strength (μTBS) was determined for each storage time. Additional specimens were prepared for transmission electron microscopy (TEM); they were produced with or without prior polyalkenoic acid conditioning in the same manner as for the μTBS test. RESULTS: There was no significant difference in μTBS to conditioned dentin (p > 0.05). After 6 months of aging, the μTBS to non-conditioned dentin was significantly reduced as compared to the 1-week, 1-month, and 3-month results (p < 0.05). The failures appeared to be of a mixed nature, although aging caused more areas of cohesive than adhesive failure in all groups. TEM observation showed a demineralized layer and an amorphous gel phase in the polyalkenoic acid conditioned group. CONCLUSION: Aging did not reduce the bond strength of the conventional glass-ionomer cement to dentin when the surface was pretreated with a polyalkenoic acid conditioner. ispartof: Journal of Adhesive Dentistry vol:17 issue:2 pages:141-146 ispartof: location:Germany status: published
- Published
- 2015