IADR Abstract Archives
Universal Adhesives’ Influences on Adhesion of Repaired CAD/CAM Systems
Objectives: The aim of this in vitro study was to evaluate the influences of different universal adhesives on the repair bond strength of CAD/CAM systems.
Methods: 90 samples (5x5x2mm) were obtained from three different CAD/CAM materials: a feldspathic ceramic (CEREC, Dentsply), a nano-ceramic hybrid (Grandio Blocs, Voco) and a lithium disilicate glass-ceramic (IPS e-max CAD, Ivoclar) (N=30). Each CAD/CAM samples were randomly divided into 2 subgroups according to types of universal adhesives (two-component self-cure universal adhesive: Tokuyama Universal Bond II and one-component light-cure universal adhesive: Clearfil Universal Bond Quick) (n=15). The surfaces of CAD/CAM were roughened by diamond bur. Then, orthophosphoric acid and universal adhesives were utilised according to the manufacturers’ instructions. The repair procedure was completed with a nano-ceramic composite (Ceram-X Sphere TEC-One) using a cylinder-shaped mold. They were kept in distilled water at 37°C for 24h and thermocycled for 10,000 cycles(5–55°C). The shear bond strength (SBS) was evaluated with a universal test machine (crosshead speed:1 mm/min). Fractured surfaces were examined with a stereomicroscope. Statistical analysis was performed with a two-way ANOVA and Bonferroni tests (p<0,05).
Results: In terms of restorative materials, for Tokuyama Universal Bond II applied groups, CEREC exhibited significantly highest SBS; whereas for Clearfil Universal Bond Quick applied groups, Grandio Blocs showed significantly highest SBS (p<0,05). Comparing the adhesive systems, for CEREC and IPS e-max, Tokuyama Universal Bond II led to significantly higher SBS than Clearfil Universal Quick Bond. However, for Grandio Blocs, there were no significant differences in SBS between both adhesives (p>0,05). Stereomicrocope analysis determined that increased number of cohesive and mixed failures were observed for CEREC and IPS e-max, when Tokuyama Universal Bond II was applied.
Conclusions: For repair procedures of feldspathic ceramic and lithium disilicate glass-ceramic, two-component self-cure universal adhesive caused significantly greater bond strength than one-component light-cure universal adhesive.
Methods: 90 samples (5x5x2mm) were obtained from three different CAD/CAM materials: a feldspathic ceramic (CEREC, Dentsply), a nano-ceramic hybrid (Grandio Blocs, Voco) and a lithium disilicate glass-ceramic (IPS e-max CAD, Ivoclar) (N=30). Each CAD/CAM samples were randomly divided into 2 subgroups according to types of universal adhesives (two-component self-cure universal adhesive: Tokuyama Universal Bond II and one-component light-cure universal adhesive: Clearfil Universal Bond Quick) (n=15). The surfaces of CAD/CAM were roughened by diamond bur. Then, orthophosphoric acid and universal adhesives were utilised according to the manufacturers’ instructions. The repair procedure was completed with a nano-ceramic composite (Ceram-X Sphere TEC-One) using a cylinder-shaped mold. They were kept in distilled water at 37°C for 24h and thermocycled for 10,000 cycles(5–55°C). The shear bond strength (SBS) was evaluated with a universal test machine (crosshead speed:1 mm/min). Fractured surfaces were examined with a stereomicroscope. Statistical analysis was performed with a two-way ANOVA and Bonferroni tests (p<0,05).
Results: In terms of restorative materials, for Tokuyama Universal Bond II applied groups, CEREC exhibited significantly highest SBS; whereas for Clearfil Universal Bond Quick applied groups, Grandio Blocs showed significantly highest SBS (p<0,05). Comparing the adhesive systems, for CEREC and IPS e-max, Tokuyama Universal Bond II led to significantly higher SBS than Clearfil Universal Quick Bond. However, for Grandio Blocs, there were no significant differences in SBS between both adhesives (p>0,05). Stereomicrocope analysis determined that increased number of cohesive and mixed failures were observed for CEREC and IPS e-max, when Tokuyama Universal Bond II was applied.
Conclusions: For repair procedures of feldspathic ceramic and lithium disilicate glass-ceramic, two-component self-cure universal adhesive caused significantly greater bond strength than one-component light-cure universal adhesive.