Best method of decontamination of the tooth-resin interface

Objectives:
This study was designed to analyse the shear bond strength of two bonding agents used to bond a hybrid composite, herculite XRV to a hydroxyapatite disk, contaminated with artificial saliva or compressor oil, with or without 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 buildup 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 ± 12 MPa) than OptiBond Solo Plus (32.3 ± 14.8 MPa) without contamination. However, OptiBond Solo plus was more resistant to bond failure and responded better to decontamination methods.
Conclusions:
It can be concluded that the effect of decontamination procedures differs for different bonding agents and contaminants and there is no one standard method of decontamination.