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Background: Contamination is the most common problem of the dental composites when the incremental
technique is used to restore a tooth, which results in low bond strengths between the tooth and the resin
composite. This study was designed to evaluate the best method to decontaminate the tooth resin interface
by analysing the shear bond strength of two bonding agents used to bond a hybrid composite, Herculite
XRV to a hydroxyapatite disk with and without contamination and decontamination procedures.
Methods: The hydroxyapatite discs were acid-etched, rinsed and air-dried prior to bonding. Specimens were
divided into 4 groups, Control group: Normal bonding, Group 1: Contamination, normal bonding Group 2:
Contamination, air-blow, normal bonding Group 3: Contamination, rinse, normal bonding. Following bond
application, the composite (4mm diameter, 4 mm height) was build-up in 2 X 2 mm increments cured with
an LED curing light. Specimens were stored in damp gauze sealed in a bag at 37 °C for 24 hours prior to
testing. The shear bond strength was determined and mode of failure assessed using an Optical Microscope.
Results: The three-step etch and rinse adhesive, OptiBond FL, exhibited higher bond strength (43.2 ± 2 MPa)
than OptiBond Solo Plus (32.3 ± 2.4 MPa) without contamination. However, OptiBond Solo plus was more
resistant to bond failure and responded better to decontamination methods.
Conclusion: Air drying was found the most reliable method for decontamination. However, isolation remains
the key factor in protecting the resin-tooth interface by any contamination.
Omair Anjum, Omer Yousaf, Muhammad Qasim, Behzad Salahuddin, Shoaib Khan, Madiha Pirvani. (2019) Evaluation Of The Best Method To Decontaminate The Tooth-resin Interface, The Pakistan Journal of Medicine and Dentistry, Volume 8, Issue-3.
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