IADR Abstract Archives
Removal of Zirconia’s Saliva Contamination with Z-Clean
Objectives: Phosphate-monomer containing primers and cements chemically bond to zirconia ceramics. However, zirconia restorations are susceptible to saliva contamination during intraoral try-in. The phosphates in saliva chemically bond to zirconia internal surface and difficult to remove. The purpose of this study is to investigate the effects of saliva contamination on zirconia bond strength, and to investigate whether a new zirconia cleaning agent, Z-Clean, is able to minimize the adverse effects of zirconia contamination.
Methods: Zirconia ceramic was lightly sandblasted and randomly divided into 6 groups. Group 1 and 4 (Control) were not contaminated with saliva. Group 2,3,5,6 were contaminated with saliva-1min, then either cleaned by water, or by a zirconia cleaning gel (Z-Clean, Bisco). Group 1-3 were then directly cemented with a Calcium-releasing and MDP-containing self-adhesive resin cement, TheraCem (Bisco) (n=5). Group 4-6 were treated with an MDP-containing zirconia primer, Z-Prime Plus (Bisco), and then cemented with a dual-cure resin cement (Duolink Universal, Bisco) (n=6). Shear bond strength was tested using the ISO 29022:2013 (Notched-edge shear bond strength, bonding area 4.5mm2). The specimens were then stored in de-ionized water (37°C/24hours), and tested by Instron tester (crosshead-speed 1mm/min). The data were analyzed statistically by one-way ANOVA and Student t-test (p<0.05).
Results: Mean shear bond strength in MPa (standard deviation) are shown in Table. Means with different letters are statistically different (p<0.05).
Conclusions: Saliva contamination significantly decreased zirconia bond strengths. Cleaning with a zirconia cleaning gel (Z-Clean) was the effective methods to eliminate the adverse effects of saliva contamination.
Methods: Zirconia ceramic was lightly sandblasted and randomly divided into 6 groups. Group 1 and 4 (Control) were not contaminated with saliva. Group 2,3,5,6 were contaminated with saliva-1min, then either cleaned by water, or by a zirconia cleaning gel (Z-Clean, Bisco). Group 1-3 were then directly cemented with a Calcium-releasing and MDP-containing self-adhesive resin cement, TheraCem (Bisco) (n=5). Group 4-6 were treated with an MDP-containing zirconia primer, Z-Prime Plus (Bisco), and then cemented with a dual-cure resin cement (Duolink Universal, Bisco) (n=6). Shear bond strength was tested using the ISO 29022:2013 (Notched-edge shear bond strength, bonding area 4.5mm2). The specimens were then stored in de-ionized water (37°C/24hours), and tested by Instron tester (crosshead-speed 1mm/min). The data were analyzed statistically by one-way ANOVA and Student t-test (p<0.05).
Results: Mean shear bond strength in MPa (standard deviation) are shown in Table. Means with different letters are statistically different (p<0.05).
Conclusions: Saliva contamination significantly decreased zirconia bond strengths. Cleaning with a zirconia cleaning gel (Z-Clean) was the effective methods to eliminate the adverse effects of saliva contamination.