alexa The effect of storage conditions, contamination modes and cleaning procedures on the resin bond strength to lithium disilicate ceramic.



Author(s): Klosa K, Wolfart S, Lehmann F, Wenz HJ, Kern M

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Abstract PURPOSE: The purpose of this in-vitro study was to evaluate the resin bond strength to pre-etched lithium disilicate ceramic using different cleaning methods after two contamination modes (saliva or saliva and silicone). MATERIALS AND METHODS: Plexiglas tubes filled with composite resin (MultiCore Flow) were bonded to etched and silanized ceramic disks made of lithium disilicate ceramic (IPS e.max Press) using a luting resin (Multilink Automix). Either etched or unetched ceramic surfaces were contaminated with saliva or with saliva followed by a disclosing silicone. Groups of 16 specimens each were bonded after pretreatment using 4 surface cleaning agents (37\% phosphoric acid, 5\% hydrofluoric acid, 96\% isopropanol, air polishing device with sodium bicarbonate) in different combinations. Before measuring tensile bond strength, specimens were stored for 3 or 150 days with thermocycling. RESULTS: After 150 days of storage, etching of saliva-contaminated surfaces with 5\% hydrofluoric acid and/or 37\% phosphoric acid provided statistically significantly higher bond strengths (37.9 to 49.5 MPa) than the other cleaning methods (1.7 to 15.5 MPa). After saliva and silicone contamination, etching with 5\% hydrofluoric acid provided statistically significantly higher bond strengths (44.5 to 50.3 MPa) than all other cleaning methods (0.3 to 13.5 MPa). CONCLUSION: Ceramic cleaning methods after try-in procedures have a significant influence on the resin bond strength and are dependent on the type of contamination. Re-etching lithium disilicate ceramic with 5\% hydrofluoric acid is most effective in removing contamination with saliva and/or a silicone disclosing medium.
This article was published in J Adhes Dent and referenced in Dentistry

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