Safe use of ozone gas in enamel adhesion

AbstractPurposeEvaluate the shear bond strength of a self-etching system to enamel pretreated with ozone and its type of fracture.Matherial and methodsThirty sound bovine incisors were bisected and polished just before the application of the adhesive system. The adhesion area was limited to a 3-mm diameter. The specimens were randomly assigned to the experimental groups (n=15) and composite resin cylinders were added to the tested surfaces, after the application of the adhesive according to the manufacturer's instructions. Group G1 (AdheSE® with ozone) was previously prepared with ozone gas from the HealOzone unit (Kavo®) for 20s, groups G2 (AdheSE®) was used as control. The specimens were stored in distilled water for 24h at 37°C with 100% humidity, before being thermocycled. The type of fracture was analyzed under scanning electronic microscope and the data were submitted to Shapiro–Wilk, Student's t-test and Chi-squared statistical analyses.ResultsThe mean bond strengths were G1: 15.0MPa (77.8% of adhesive fractures between enamel and adhesive) and G2: 13.1MPa (36.4% of adhesive fractures between enamel and adhesive).ConclusionThe shear bond strength of a self-etching system was not influenced by the previous application of ozone gas