Influence of cleaning methods on bond strength to saliva contaminated zirconia

Abstract

Objective To evaluate the influence of saliva contamination and cleaning procedures on shear bond strength (SBS) of a self‐adhesive resin cement (SAC) to zirconia surfaces. Materials and Methods A total of 160 sandblasted zirconia blocks were randomly divided into eight groups as follows: No saliva contamination, no cleansing (NC‐NC); contamination with saliva, no cleansing (SC‐NC); no saliva contamination, cleansing with a zirconia primer (ZP; Z‐Bond, Danville Materials, Inc., S. Ramon, California) (NC‐ZP); contamination with saliva, cleansing with ZP (SC‐ZP); no saliva contamination, cleansing with hydrofluoric acid (HF; Ultradent Porcelain Etch; Ultradent Products, South Jordan, Utah) followed by cleansing with ZP (NC‐HF‐ZP); contamination with saliva, cleansing with HF followed by cleansing with ZP (SC‐HF‐ZP); cleansing with ZP, contamination with saliva, cleansing with ZP (ZP‐SC‐ZP); application of ZP, contamination with saliva, cleansing with HF followed by cleansing with ZP (ZP‐SC‐HF‐ZP). Cylindrical resin composite blocks were luted to the zirconia surfaces with SAC (Clearfil SA Cement Automix, Kuraray, Inc., Tokyo, Japan). Specimens were subjected to shear forces at a cross‐head speed of 0.5 mm/min. Data were analyzed with Analysis of Variance and Tukey tests (α = 0.05). Results The bond strength values to zirconia were significantly influenced by saliva contamination (P < .05). The SC‐NC group showed the lowest bond strength values (5.6 ± 1.4 MPa; P < .05). All cleansing or pretreatment agents improved the bond strengths when compared to noncleansing groups, NC‐NC and SC‐NC. Conclusion In situations where saliva contamination is deemed unavoidable, application of ZP after try‐in of the zirconia restoration could be beneficial for the accurate cementation. Clinical Significance During try‐in sessions of fixed dental prostheses, zirconia ceramic restoration may come into contact with saliva and surfaces should be cleansed to obtain an optimal surface for adhesion. Application of zirconia primer to the sandblasted zirconia surface is recommended whether the surface is contaminated with saliva or not.

Cleaning Zirconia Surface Prior To Bonding: A Comparative Study of Different Methods and Solutions

“…However, this interaction is absent when ZrO 2 and HF are in contact. Instead, HF interacts with the organic contaminants and dissolves them from the zirconia surface 21 . Phosphoric acid also reacts with organic contaminants to remove them from a ceramic surface.…”

“…Instead, HF interacts with the organic contaminants and dissolves them from the zirconia surface. 21 Phosphoric acid also reacts with organic contaminants to remove them from a ceramic surface. However, when phosphoric acid comes in contact with zirconia, an interaction between the ZrO 2 and P occurs, leaving an inorganic P residue on the surface.…”

Immediate bond performance of resin composite luting systems to saliva‐contaminated enamel and dentin in different curing modes

“…Among possible adhesion inhibitors, saliva contamination is frequently encountered in clinical situations and may be one of the main reasons for decreased bond strength [6]. Because organic deposits remain on the tooth surface even after rinsing with water, saliva contamination affects the bond performance of resin composite luting systems [8].…”

Farkli Yüzey Dekontami̇nasyon Yöntemleri̇ni̇n Cad/Cam Yüzeyleri̇n Bağlanma Dayanim Değerleri̇ Üzeri̇ne Etki̇si̇

“…[16][17][18][19] Bu nedenle kontaminasyonun önlenmesi önemlidir. Simantasyondan önce kontamine yüzeylerin farklı temizleme protokolleri ile (su spreyi 17,[20][21][22] , alkol (%70-96 izopropanol) 13,23 , zirkonya primeri 24 , plazma 23,25 , İvoclean 17 ya da tekrar kumlama 14,26,27 ) temizlenmesi önerilebilmektedir. Ayrıca, bir çok klinisyen, dezenfektan bir solüsyon olan %70'lik etanolü temizleme protokolünde kullanmaktadır.…”