Effect of Dimethyl Sulfoxide as Dentin Surface Pretreatment on Microtensile Bond Strength of Self-Adhesive Versus Conventional Flowable Composite

Document Type : Original Article

Authors

1 MSc Student, Conservative Department , Faculty of Dentistry, Mansoura University

2 Assistant Professor, Conservative Dentistry Department, Faculty of Dentistry, Mansoura University

3 Professor, Conservative Department, Faculty of Dentistry, Mansoura University

Abstract

Abstract
Objective: Evaluation of the microtensile bond strength of self-adhesive flowable composite in comparison with conventional flowable composite/self-etch adhesive system with and without dimethyl sulfoxide surface pretreatment.
Methods: Based on the type of composite, 60 recently extracted, intact human permanent molars were randomly divided into two main groups, self-adhesive flowable composite (SAFC) (n = 30) was used in the first group, and conventional flowable composite (CFC) (n = 30) was employed in the second. Afterwards, two subgroups were created for each group according to the surface pretreatment (n = 15). A test of microtensile bond strength (µTBS) was conducted on a sample of 15 specimens. Using a stereomicroscope, the mode of failure was examined. The multiple comparison post hoc test was utilized for statistical analysis of the μTBS data.
Results: The multiple comparison test showed that the mictotensile bond strength (μTBS) of self-adhesive flowable composite (SAFC) Fusio Liquid Dentine with dimethyl sulfoxide (DMSO) as surface pretreatment was significantly greater than that of any group (p > 0.05). A comparison test showed that the self-adhesive flowable composite with and without dimethyl sulfoxide (DMSO) surface pretreatment differed significantly upon examination of μTBS (p < 0.05). But when comparing conventional flowable composite with and without dimethyl sulfoxide (DMSO) surface pretreatment, there was no significant difference in μTBS (p > 0.05).
Conclusion: The application of dimethyl sulfoxide (DMSO) as a surface pretreatment enhances Fusio Liquid Dentin self-adhesive flowable composite microtensile bond strength to dentin, but it barely affects the Flow-It conventional flowable composite strength.

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Egyptian Dental Journal
Volume 70, Issue 4 - Serial Number 5
Conservative Dentistry and Endodontics
October 2024
Pages 3917-3926

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