IADR Abstract Archives
Colloidal Platinum Nanoparticles Improve Luting Effectiveness and Durability
Objectives: Previous research reported that colloidal platinum nanoparticles (CPN) applied onto dentin for 30 s significantly improved the bonding performance of 4-META/MMA-TBB resin. In continuation, three recently introduced CPN formulations remain to be tested on their adhesion-promoting effect, being the main objective of this study.
Methods: Forty caries-free human molars were randomly assigned to the following four experimental groups: CPN1: aqueous 0.02% platinum in a protective coating containing 1.69% polyacrylic acid; CPN2: idem but with the coating containing 0.29% sodium citrate; CPN3: idem but with the coating containing 0.29% sodium citrate and 0.29% γ-cyclodextrin; Ctrl (control): no CPN coating. Ground (#600 SiC-grit) dentin surfaces were etched with ‘10-3 solution’ (10% citric acid, 3% ferric chloride) for 10 s, thoroughly rinsed and gently air-dried, upon which the three CPN formulations were applied using a rubbing motion for 30 s. After CPN application, an acrylic resin block was adhesively luted onto dentin using the 4-META/MMA-TBB resin-based cement Super-Bond C&B (Sun Medical) under a continuous 1-kg pressure. After 1-week water storage at 37°C, all specimens were sectioned into 1-mm2sticks. Half of the sticks were tested immediately to determine the ‘immediate’ micro-tensile bond strength (µTBS), while the ‘aged’ µTBS was measured after 50K thermal cycles. The data were analyzed by two-way ANOVA and Scheffé's post-hoc test at α=0.05 (SPSS statistics ver. 24, IBM)
Results: CPN improved µTBS with CPN2 achieving the highest ‘immediate’ µTBS, which was significantly better than that of the control (no CPN coating). Upon aging, µTBS of all CPN formulations, except CPN1, decreased but remained significantly higher than the µTBS of the control.
Conclusions: This study indicated that all CPN formulations promoted the luting performance of the 4-META/MMA-TBB resin-based cement to dentin both immediately and upon aging.
Methods: Forty caries-free human molars were randomly assigned to the following four experimental groups: CPN1: aqueous 0.02% platinum in a protective coating containing 1.69% polyacrylic acid; CPN2: idem but with the coating containing 0.29% sodium citrate; CPN3: idem but with the coating containing 0.29% sodium citrate and 0.29% γ-cyclodextrin; Ctrl (control): no CPN coating. Ground (#600 SiC-grit) dentin surfaces were etched with ‘10-3 solution’ (10% citric acid, 3% ferric chloride) for 10 s, thoroughly rinsed and gently air-dried, upon which the three CPN formulations were applied using a rubbing motion for 30 s. After CPN application, an acrylic resin block was adhesively luted onto dentin using the 4-META/MMA-TBB resin-based cement Super-Bond C&B (Sun Medical) under a continuous 1-kg pressure. After 1-week water storage at 37°C, all specimens were sectioned into 1-mm2sticks. Half of the sticks were tested immediately to determine the ‘immediate’ micro-tensile bond strength (µTBS), while the ‘aged’ µTBS was measured after 50K thermal cycles. The data were analyzed by two-way ANOVA and Scheffé's post-hoc test at α=0.05 (SPSS statistics ver. 24, IBM)
Results: CPN improved µTBS with CPN2 achieving the highest ‘immediate’ µTBS, which was significantly better than that of the control (no CPN coating). Upon aging, µTBS of all CPN formulations, except CPN1, decreased but remained significantly higher than the µTBS of the control.
Conclusions: This study indicated that all CPN formulations promoted the luting performance of the 4-META/MMA-TBB resin-based cement to dentin both immediately and upon aging.
IMAGES
3217766_File000000.jpg
3217766_File000000.jpg