Objectives: To determine the micro-tensile bond strength (µTBS) of a conventional glass- ionomer to dentin ‘immediately’ and ‘after ageing’ with or without pre-treatment using a polyalkenoic-acid conditioner. Methods: Occlusal dentin surfaces of 10 teeth were ground flat using a 100-µm diamond bur. Glass-ionomer (Fuji IX GP Extra, GC) was bonded to the surfaces with and without beforehand conditioning using the polyalkenoic-acid containing Cavity Conditioner (GC). After 1-week water-storage at 37°C, specimens were serially cut into 1-mm2 stick-shaped micro-specimens, of which per tooth equal parts of specimens were further subjected to 1-month and 3-month water-storage, respectively. The µTBS was determined ‘immediately’ (1-week water storage) and after ‘1-month ageing’ and ‘3-month ageing’ at a crosshead speed of 1.0 mm/min. Failure analysis was performed using stereo-microscopy and SEM. Data were statistically analyzed by ANOVA and Tukey’s HSD. Results: No significant difference in µTBS was recorded when the conventional glass-ionomer was bonded to conditioned and non-conditioned dentin (p<0.05). Most specimens failed predominantly cohesively within the cement. Conclusions: Ageing did not reduce the bond strength of the conventional glass-ionomer to dentin, this irrespective if the surface was beforehand treated with a polyalkenoic-acid conditioner or not.
µTBS to dentin (MPa)
1-week storage 1-month ageing 3-month ageing
Non-conditioned 10.8±4.6A 9.0±3.6A 9.3±2.6A
Conditioned 11.3±3.5a 8.7±3.3a 8.8±3.4a
Same letter indicates absence of statistical significance (Tukey’s HSD, p<0.05)