• Kullapop Suttiat D.D.S., Grad. Dip. (Prosthodontics)
• Chairat Wiwatwarapan B.Sc., M.S.

Objective To examine the effects of one and two-bottle silane coupling agents on bond strengths
between a resin composite and 4 prefabricated fiber posts.

Materials and methods Twelve prefabricated fiber posts of DT Light post^®, FRC postec^®, Easy
post and Innopost compaq^®, were used. The posts of each product were randomly divided into 2
subgroups according to silane used for surface treatment, one-bottle (Monobond S^®) or two-bottle
(Porcelain liner M^®), so there were 8 experimental groups. A light-cured resin composite was used to
build-up the core around each post. Serially cut a composite post and core into beam for microtensile
bond strength (μTBS) test. Eighteen specimens were prepared for each group. Each specimen was
loaded in tension with universal testing machine until failure. The data were analyzed using the one
way ANOVA and t-test at 95% confident interval.

Results The two-bottle silane (Porcelain liner M^®) demonstrated significantly higher mean bond
strengths between resin composite and prefabricated fiber posts compared to the one-bottle (Monobond
S^®) for all 4 post products (p < 0.05). Mean μTBS were significantly affected by product of fiber post
(p < 0.05). All tested specimens showed adhesive failure.

Conclusion The two-bottle silane demonstrates a significantly higher μTBS than the one-bottle
silane preparation in all 4 products of prefabricated fiber post.

(CU Dent J. 2010;33:99-108)