IADR Abstract Archives

Application Mode Affects the Bond Strength of Self-etch Adhesives

Objectives: Two-step self-etch adhesives show superior in-vitro dentin bonding performance than their one-step counterparts. Though material dependent, double-application of one-step systems and placement of a hydrophobic resin coat over the adhesive layer improves their performance. This study compared the microtensile bond strength (µTBS) of an experimental two-step self etch adhesive with a gold-standard two-step self-etch adhesive and a universal adhesive. In addition, the effects of placement of three different hydrophobic resin coats over the universal adhesive were also evaluated.
Methods: Midcoronal dentin surfaces of human third molars (N=18) were polished with 180-grit SiC paper and randomly allocated to 6 groups (n=3): BZF29 (BZF29, two-step, experimental), Clearfil Megabond 2 (MB2, two-step, positive control) and G-Premio Bond (GP, universal, negative control) were applied following manufacturer’s instructions; a hydrophobic resin coat of either BZF21, BZF210 or BZF216 was placed over GP (GP+BZF21, GP+BZF210 and GP+BZF216). Following composite-resin build-up and water-storage (37°C; 24h), μTBS were obtained. Fracture modes were determined using a stereomicroscope. Resin-dentin interfaces were observed by SEM. The μTBS data were analyzed by one-way ANOVA, followed by Tukey’s test (α=0.05).
Results: μTBS of BZF29, MB2, GP+BZF21 and GP+BZF216 were significantly higher than GP and GP+BZF210 (p〈0.05). Except for MB2, the predominant fracture mode was adhesive. SEM images showed that adhesive layers produced by GP were thinner than the other tested groups.
Conclusions: In general, placement of a hydrophobic resin coat improved the bonding performance of GP. This improvement is believed to be the result of increased adhesive thickness providing improved stress distribution. The bonding performance of BZF29 was comparable to that of MB2.
IADR/AADR/CADR General Session
2020 IADR/AADR/CADR General Session (Washington, D.C., USA)
Washington, D.C., USA
2020
0075
Dental Materials 4: Adhesion
  • Chowdhury, Abu Faem Mohammad  ( Hokkaido University , Sapporo , Hokkaido , Japan ;  Sapporo Dental College , Dhaka , Bangladesh )
  • Alam, Arefin  ( Hokkaido University , Sapporo , Hokkaido , Japan )
  • Shamme Akter, Rime  ( Hokkaido University , Sapporo , Hokkaido , Japan )
  • Islam, Rafiqul  ( Hokkaido University , Sapporo , Hokkaido , Japan )
  • Yamauti, Monica  ( Hokkaido University , Sapporo , Hokkaido , Japan ;  Universityersidade Federal de Minas Gerais , Belo Horizonte , Brazil )
  • Sano, Hidehiko  ( Hokkaido University , Sapporo , Hokkaido , Japan )
  • Ministry of Education, Science, and Culture of Japan, 19K24110.
    NONE
    Oral Session
    Adhesive Procedure Variations