IADR Abstract Archives
Hydrolytic Degradation of Total-etch 2-Steps Adhesive Systems After 6 Months
Objectives: The aim of the study was to evaluate the hydrolytic degradation of total-etch 2-steps adhesive systems.
Methods: Five adhesive systems were evaluated (n=10): [SB] Singlebond2 (3M ESPE), [AM] Ambar (FGM), [MB] Magicbond (Vigodent), [YM] Ymono (Yller), and [CS] ClearfilSE (Kuraray). For microtensile bond strength (µTBS) test, fifty sound human third molars were used. Medium dentin surfaces were exposed and finished with #600SiC sandpapers for 30s, under water irrigation. Materials were used following manufacturer’s instructions and teeth were restored with resin composite (Filtek Z350XT, 3M ESPE), sectioned (0.9x0.9mm), and stored for 6 months. Specimens were tested using a universal testing machine (EZ-test, Shimadzu). Fractures were analyzed using optical microscopy (60x). Representative images were obtained with scanning electron microscopy (SEM) (JSM-5600LV, JEOL). For nanoinfiltration, 50%wt ammoniacal silver nitrate was used. Samples were dehydrated and carbon-sputtered for SEM. For water sorption (Wsp) and solubility (Wsl), discs (n=10) were created (6x1mm). The specimens were weighed until constant mass and stored in 1mL distilled water. After 7 days, the Wsp and Wsl were calculated. For contact angle, a goniometer (Ramé-Hart-DROPimage) was used. Photos were taken at 0.2s intervals. For flexural strength, bars (1x1x7 mm) (N=10) were tested in a universal testing machine (Instron 4411). Data was submitted to statistical analysis using two-factors ANOVA and Tukey's test (p<0.05).
Results: No statistical differences were observed for µTBS values after storage for CS and YM. After storage, the lower µTBS values were observed for AM and MB. There was an increase in silver infiltration in the hybrid layer for all evaluated materials. CS presented the highest flexural strength and lowest Wsp. MB presented the highest Wsl values. SB showed the highest contact angle values.
Conclusions: Different total-etch 2-steps adhesive systems showed similar properties. A self-etch 2-steps adhesive system showed lower hydrolytic degradation when compared to these materials.
Methods: Five adhesive systems were evaluated (n=10): [SB] Singlebond2 (3M ESPE), [AM] Ambar (FGM), [MB] Magicbond (Vigodent), [YM] Ymono (Yller), and [CS] ClearfilSE (Kuraray). For microtensile bond strength (µTBS) test, fifty sound human third molars were used. Medium dentin surfaces were exposed and finished with #600SiC sandpapers for 30s, under water irrigation. Materials were used following manufacturer’s instructions and teeth were restored with resin composite (Filtek Z350XT, 3M ESPE), sectioned (0.9x0.9mm), and stored for 6 months. Specimens were tested using a universal testing machine (EZ-test, Shimadzu). Fractures were analyzed using optical microscopy (60x). Representative images were obtained with scanning electron microscopy (SEM) (JSM-5600LV, JEOL). For nanoinfiltration, 50%wt ammoniacal silver nitrate was used. Samples were dehydrated and carbon-sputtered for SEM. For water sorption (Wsp) and solubility (Wsl), discs (n=10) were created (6x1mm). The specimens were weighed until constant mass and stored in 1mL distilled water. After 7 days, the Wsp and Wsl were calculated. For contact angle, a goniometer (Ramé-Hart-DROPimage) was used. Photos were taken at 0.2s intervals. For flexural strength, bars (1x1x7 mm) (N=10) were tested in a universal testing machine (Instron 4411). Data was submitted to statistical analysis using two-factors ANOVA and Tukey's test (p<0.05).
Results: No statistical differences were observed for µTBS values after storage for CS and YM. After storage, the lower µTBS values were observed for AM and MB. There was an increase in silver infiltration in the hybrid layer for all evaluated materials. CS presented the highest flexural strength and lowest Wsp. MB presented the highest Wsl values. SB showed the highest contact angle values.
Conclusions: Different total-etch 2-steps adhesive systems showed similar properties. A self-etch 2-steps adhesive system showed lower hydrolytic degradation when compared to these materials.