Effect of irradiance and exposure time on the adhesive properties of universal adhesives after 2 years of storage

Objective This study aims to evaluate the effects of exposure time and irradiance on the dentin bonding properties (microtensile bond strength (μTBS) and nanoleakage (NL)) of the Clearfil Universal Bond Quick (CUQ) adhesive and Scotchbond Universal Adhesive (SBU) immediately and after 2 years of wat...

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Bibliographic Details
Published in:Clinical oral investigations 2023-09, Vol.27 (9), p.5223-5232
Main Authors: Cavalcanti, Karoline G. B. A., Pulido, Camilo, Moreira, Pedro H. A., Monteles, Camila F., Salvatierra, Byron L. C., Siqueira, Fabiana S. F., Soares, Carlos J., Reis, Alessandra, Loguercio, Alessandro D., Cardenas, Andres F. M.
Format: Article
Language:English
Subjects:
Adhesives
Bond strength
Dentin
Dentistry
Medicine
Molars
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Summary:Objective This study aims to evaluate the effects of exposure time and irradiance on the dentin bonding properties (microtensile bond strength (μTBS) and nanoleakage (NL)) of the Clearfil Universal Bond Quick (CUQ) adhesive and Scotchbond Universal Adhesive (SBU) immediately and after 2 years of water storage. Material and methods Hence, 128 human molars were randomly assigned to 16 groups based on adhesive strategy, irradiance/exposure times, and storage time for each universal adhesive tested. The adhesives were applied using the etch-and-rinse and self-etch strategies and were light-cured using four different irradiance/exposure times: 1400 mW/cm 2 for 5 s (1400 × 5), 1400 mW/cm 2 for 10 s (1400 × 10), 3200 mW/cm 2 for 5 s (3200 × 5), and 3200 mW/cm 2 for 10 s (3200 × 10). Then, each sample was restored and sectioned into a resin-dentin bonded stick to be tested for μTBS and NL (immediately and after 2 years of water storage). The mean μTBS and NL of all resin-dentin bonded sticks from the same hemi-tooth (factor time) were statistically analyzed using a three-way ANOVA and Tukey’s test ( a  = 0.05). Results Despite a significant decrease in the μTBS values for all groups after 2 years of water storage, the 3200 × 5 group showed higher μTBS values, whereas the 3200 × 10 group showed lower μTBS values for both universal adhesives tested. Although a significant increase in the NL values was observed for all groups after 2 years of water storage, the 3200 × 10 group showed higher NL values than the other groups ( p  
ISSN:1436-3771
1432-6981
1436-3771
DOI:10.1007/s00784-023-05142-8