Objectives: The aim of the present study was to evaluate the extent of O2 inhibition in commercially available visible light-cured all-in-one adhesives. The testing hypothesis was that statistically significant differences exist in the extent of O2 inhibition among the products tested.
Methods: The products tested were: iBond, G-Bond, Go!, Optibond all-in-one, S3 Bond. The extent of O2 inhibition was assessed: (a) By the standard film thickness method employing 100 μm spacers to measure directly the width of the O2 inhibited layer by transmitted-light microscopy; (b) Gravimetrically, by weighing (±0,1mg) a drop of light-cured material (halogen unit, standard mode, 40s exp at 750 mW/cm2 ) placed on a glass cover slip and on a standardized dimension dentin disc, before and after removal of the O2 inhibited layer with acetone. Five specimens were tested from each material. Two-way ANOVA and Tukey´s test were used to statistically evaluate mean differences among the materials tested (α=0.05).
Results: The results are given in the following
table (mean ± SD). Same superscripts indicate mean values with
no statistically significant differences (p<0.05)
ADHESIVE |
OPTICAL METHOD |
GRAVIMETRIC METHOD |
|
GLASS |
DENTIN |
||
iBond |
6.52 ±0.87a |
10.60 ±2.70c |
33.09±6.05f |
G-Bond |
5.80 ±1.15a |
10.89±4.55c |
23.11 ±7.72 e,f |
Go! |
14.20 ±4.69 |
21.99 ±9.90 |
17.14 ±4.04e |
Optibond |
6.88 ±1.98a |
2.16 ±0.77b |
6.54±2.52d |
S3 Bond |
4.06 ±0.45a |
1.04 ±0.72b |
2.67 ±1.45d |
Conclusions:
Statistically significant differences were found among the materials tested, which show variations in the minimum curable adhesive film thickness that can be obtained under atmospheric conditions.