Effect of Thermal Cycling on Enamel Bond Strength of Single-step Self-etch Systems

Abstract

After thermal cycling, some recently introduced simplified bonding systems showed no change in enamel bond strengths. The systems used were Absolute, Clearfil tri-S Bond, G-Bond and One-Up Bond F Plus. Bovine mandibular incisors were mounted in self-curing resin, and the facial surfaces were wet ground with #600 SiC paper. Adhesives were applied on the prepared enamel surfaces and light irradiated according to each manufacturer's instructions. Resin composites were condensed into a mold (ø4x2 mm) and light irradiated for 30 seconds. Thirty specimens per adhesive systems were divided into 1 of 3 test groups (n=10) following storage in water at 37°C for 24 hours. The specimens were then stored in 37°C water for 24 hours, followed by thermal cycling 10,000 and 20,000 times between 5°C and 60°C. After each storage condition, the specimens were tested in shear mode at a crosshead speed of 1.0-mm/minute. One-way ANOVAs and Tukey HSD test at a level of 0.05 were conducted.After 24 hours of water storage, the mean enamel bond strengths ranged from 11.3 to 16.9 MPa, and Clearfil tri-S Bond showed significantly higher bond strength. After thermal cycling, the mean bond strengths ranged from 8.3 to 20.7 MPa. The changes in enamel bond strengths were different among the adhesive systems tested. Failure modes after the test were commonly adhesive failure associated with partial cohesive failure adhesive in resin.

Effects of One-year Storage in Water on Bond Strength of Self-etching Adhesives to Enamel and Dentin

“…Results of the current study showed a slight, but not statistically significant, decrease in bond strength for SE and TS to enamel during the storage period. Conversely, Wang et al 16) reported on a significant decrease in bond strength with SE after one year of storage in sodium chloride, while others claimed that SE 17) and TS 18) showed durable bonding to enamel. During the one-year storage in the present study, SE showed stable bonding to dentin.…”

“…Susceptibility of resin components to hydrolysis has been identified as a cause for decrease of bond strength. It has been suggested that the outstanding hydrolytic stability of MDP and its additional chemical interaction with enamel and dentin contributed to the long-term durability of dentin and enamel bonding with SE 17,21) and TS 18,22) . MDP has a special molecular structure that enables chemical interaction with residual hydroxyapatite after etching, and the calcium salts formed thereby also exhibit hydrolytic stabiltiy 21) .…”

Alternative Pretreatment Modalities with a Self‐Adhesive System to Promote Dentin/Alloy Shear Bond Strength

“…The teeth were then embedded in self‐cured acrylic resin using a cylindrical Teflon mold such that the long axis of the tooth was perpendicular to the surface of the mold. The dentinal surfaces were abraded with 360‐grit silicon carbide paper under running water to create a flat, uniform, smooth dentinal surface 14,15 . The bonding procedure was performed immediately.…”

“…Secondary reactions have been suggested to provide chemical adhesion to hydroxyl‐apatite, a feature currently only proven for glass‐ionomers 11–13 . A new self‐etching adhesive system, G‐bond (GC, Tokyo, Japan), has been developed and marketed to produce a very thin (0.3 μm or less) layer, which is regarded as a chemical reacted layer when applied to dentin 14–16 …”

Effect of various surface treatments of implant abutment and metal cope fitting surface on their bond strength to provisional resin cement

“…The change in mechanical properties after thermocycling could result in a tendency toward bond failure due to weakened resin tags, which exist between etched abutments, metal cope and resin [21].…”