Bonding durability of HEMA-free and HEMA-containing one-step adhesives to dentine surrounded by bonded enamel

S Torkabadi, M Nakajima, M Ikeda, R M Foxton, J Tagami

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

Objective: To evaluate the bonding durability of HEMA-free and HEMA-containing one-step adhesives to dentine surrounded by bonded enamel after 1-year storage in water.

Material and method: Flat coronal dentine surfaces of extracted human molars were prepared, leaving the surrounding enamel. Two one-step self-etch adhesive systems: HEMA-containing Tri-S Bond (TSB; Kuraray Medical Inc., Tokyo, Japan) and HEMA-free G Bond (GB; GC Co., Tokyo, Japan), were applied to both dentine and the surrounding enamel surfaces according to manufacturers' instructions. Following resin composite crown (Clearfil AP-X, Kuraray Medical Inc., Tokyo, Japan) build-ups, the bonded specimens were stored in 37 degrees C water for 24 h (control group), 3 months, 6 months and 1 year. After the designated periods of water storage, the specimens were serially sectioned perpendicular to the adhesive interface into 0.7 mm. thick slabs, and then trimmed to form hour-glass configurations with a 1 mm(2) cross-sectional area. The micro-tensile bond strength (mu TBS) test was carried out at a crosshead speed of 1.0 mm/min. The mu TBS data were statistically analyzed using two-way ANOVA, t test, and Tukey's HSD post hoc multiple comparison tests (alpha = 0.05).

Results: After 1 year water of storage, the bond strength of TSB to dentine was significantly lower compared with the 1-day, 3-month and 6-month groups (p <0.05). On the other hand, the LTBS of GB decreased over time, but there was no significant difference between the experimental periods (p > 0.05).

Clinical significance: Bonded enamel margins may not maintain the integrity of the resin-dentine interface created by HEMA-free and HEMA-containing one-step adhesives.
Original languageEnglish
Pages (from-to)80 - 86
Number of pages7
JournalJournal of Dentistry
Volume36
Issue number1
DOIs
Publication statusPublished - Jan 2008

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