Influence of different photoinitiators on the resistance of union in bovine dentin: experimental and microscopic study
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Marcelo Basílio [1] ; Renata Gregorio [1] ; João-Victor Câmara [2] ; Lizandra Serrano [1] ; Paulo-Ricardo Campos [1] ; Josué-Junior Pierote [3] ; Sonia Groisman [1] ; Gisele Pereira [1] ; Suelem Barreto [1]
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[1] Universidade Federal do Rio de Janeiro
Universidade Federal do Rio de Janeiro
Brasil
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[2] Universidade de São Paulo
Universidade de São Paulo
Brasil
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[3] Professor, Department of Dentistry, University of Santo Amaro, São Paulo, SP, Brazil
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- Localización: Journal of Clinical and Experimental Dentistry, ISSN-e 1989-5488, Vol. 13, Nº. 2 (February), 2021, págs. 132-139
- Idioma: inglés
- Enlaces
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Resumen
To evaluate in vitro the influence of photoinitiators on the microtensile strength of adhesive systems and composite resins in bovine dentin.
Forty dentin obtained from bovine teeth were randomly distributed in four groups (n = 10) according to the different adhesive systems and composite resins used: G1 - AAPS + VAPS (Ambar APS + Vittra APS); G2- AAPS + O (Ambar APS + Opallis); G3 - A + VAPS (Ambar + Vittra APS) and G4 - A + O (Ambar + Opallis). After restoration with the composite, the samples were sectioned to obtain toothpicks that were subjected to the microtensile and nanofiltration test (1.0 mm/min).
The Kruskal-Wallis test did not show significant differences between the groups (p<0.05). The values in MPa were: AAPS + VAPS - 19.56 MPa; AAPS + O - 19.77 MPa; A + VAPS - 17.78 MPa; A + O - 22.44 MPa. The result of the Mann-Whitney test showed no significant differences depending on the adhesive (Ambar Universal- 19.11 MPa, Ambar APS Universal- 21.70 MPa) and the composite resin used (Vittra APS- 18.75 MPa, Opallis - 23.75 MPa). The AAPS + VAPS and AAPS + O groups showed intense silver nitrate infiltration. The A + APS group showed a moderate infiltration and the A + O group had a mild infiltration in the adhesive system/dentin interface.
The use of different photoinitiators in the composition of adhesive systems and restorative composites did not affect their bond strength values and the presence of water in the solvent of the APS photoinitiator system had a negative influence, increasing the degree of infiltration in the hybrid layer when compared to the camphorquinone photoinitiator.
