IADR Abstract Archives
Compatibility of Nexus Universal with Various Universal Adhesives
Objectives: Nexus Universal (NXU, Kerr) was recently developed to greatly simplify cementation procedures by eliminating the need to light cure the bonding agent on tooth structure and omitting the application of a primer/adhesive on restorative substrates. NXU is compatible with all OptiBond adhesives in total-dark-cure mode (i.e. the light-curing for both the adhesive and the cement is omitted). The objective of this study was to test the bond compatibility of NXU with leading universal adhesive systems (listed in the Table) in total-dark-cure mode along with RelyX Ultimate/Scotchbond Universal (3M) and Multilink Automix/Primers A&B (Ivoclar) cement/adhesive systems . Statistical analysis was performed using One-way ANOVA and Tukey’s method of pair-wise comparison to determine significant differences among groups (p<0.05).
Methods: Dentin substrates were polished with 600 grit SiC paper prior to bonding. Each adhesive was applied per its IFU without light curing. A bonding jig (Ultradent) with a cylindrical mold (D=2.38mm) was securely placed on adhesive-covered dentin. Each cement was condensed into the mold and allowed to self-cure. The bonded specimens (n=6) were stored under 85~90% relative humidity for one hour and then in de-ionized water for 24 hours at 37oC before being subjected to shear force on an Instron mechanical tester following ISO 29022. Statistical analysis was conducted using One-way ANOVA and Tukey’s method to determine significant differences among groups (p<0.05).
Results: The highest average bond strength was observed for NXU/OptiBond eXTRa Universal which is not statistically different (p>0.05) from NXU/OptiBond Universal, but significantly higher (p<0.05) than all other cement/adhesive combinations. NXU in combination with all leading universal adhesives yielded excellent bond strength which are significantly higher (p<0.05) than those of RelyX Ultimate/Scotchbond Universal and Multilink Automix/Primers A&B systems.
Conclusions: Under total-dark-cure condition, NXU demonstrated excellent bond compatibility with all leading universal adhesive systems tested in this study.
Methods: Dentin substrates were polished with 600 grit SiC paper prior to bonding. Each adhesive was applied per its IFU without light curing. A bonding jig (Ultradent) with a cylindrical mold (D=2.38mm) was securely placed on adhesive-covered dentin. Each cement was condensed into the mold and allowed to self-cure. The bonded specimens (n=6) were stored under 85~90% relative humidity for one hour and then in de-ionized water for 24 hours at 37oC before being subjected to shear force on an Instron mechanical tester following ISO 29022. Statistical analysis was conducted using One-way ANOVA and Tukey’s method to determine significant differences among groups (p<0.05).
Results: The highest average bond strength was observed for NXU/OptiBond eXTRa Universal which is not statistically different (p>0.05) from NXU/OptiBond Universal, but significantly higher (p<0.05) than all other cement/adhesive combinations. NXU in combination with all leading universal adhesives yielded excellent bond strength which are significantly higher (p<0.05) than those of RelyX Ultimate/Scotchbond Universal and Multilink Automix/Primers A&B systems.
Conclusions: Under total-dark-cure condition, NXU demonstrated excellent bond compatibility with all leading universal adhesive systems tested in this study.