Effect of zirconia decontamination protocols on bond strength and surface wettability

• Published in: Journal of esthetic and restorative dentistry Vol. 32; no. 5; pp. 521 - 529
• Main Authors: Noronha, Mayara dos Santos, Fronza, Bruna Marin, André, Carolina Bosso, Castro, Eduardo Fernandes, Soto‐Montero, Jorge, Price, Richard Bengt, Giannini, Marcelo
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 01-07-2020; Blackwell Publishing Ltd
• Subjects: Ceramics; Contact angle; Decontamination; dental ceramics; Dental restorative materials; Dentistry; Ethanol; nonthermal atmospheric plasma; resin cement; Saliva; shear bond strength; Zirconia
• ISSN: 1496-4155; 1708-8240
• DOI: 10.1111/jerd.12615

Objective
To evaluate the effects of human saliva decontamination protocols on bond strength of resin cement to zirconia (Y‐PSZ), wettability, and microbial decontamination.
Materials and methods
Zirconia plates were sandblasted and divided into (a) not contaminated, (b) contaminated with human saliva and: (c) not cleaned, (d) cleaned with air‐water spray, (e) cleaned with 70% ethanol, (f) cleaned with Ivoclean, or (g) cleaned with nonthermal atmospheric plasma (NTAP). The wettability and microbial decontamination of the surfaces were determined after saliva contamination or cleaning. Monobond Plus (Ivoclar Vivadent) was applied after cleaning, followed by Variolink LC (Ivoclar Vivadent). The samples were stored 1 week before shear bond strength (SBS) testing, and data (SBS and wettability) were analyzed by one‐way analysis of variance and Tukey test (α = .05).
Results
Saliva contamination reduced SBS to zirconia compared to not contaminated. Both Ivoclean and NTAP produced higher SBS compared to not cleaned and were not significantly different from the not contaminated. Ivoclean produced the highest contact angle, and NTAP the lowest. With the exception of using just water‐spray, all cleaning protocols decontaminated the specimens.
Conclusions
Both Ivoclean and NTAP overcame the effects of saliva contamination, producing an SBS to zirconia comparable to the positive control.
Clinical significance
Dental ceramics should be cleaned prior to resin cementation to eliminate the effects of human saliva contamination, and Ivoclean and NTAP are considered suitable materials for this purpose.