Effect of pH and application times of a meta-phosphoric acid on resin-dentin bonding properties
| Autor: | Victor Pinheiro Feitosa, João Carlos Gomes, Matheus Coelho Bandeca, Alessandro Dourado Loguercio, Fabiana Suelen Figueredo de Siqueira, Alessandra Reis, Andres Felipe Millan Cardenas |
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| Rok vydání: | 2017 |
| Předmět: |
Molar
Polymers and Plastics Scanning electron microscope Chemistry Bond strength General Chemical Engineering 030206 dentistry 02 engineering and technology 021001 nanoscience & nanotechnology Application time Biomaterials 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine medicine.anatomical_structure stomatognathic system Biochemistry Dentin medicine Total etch Adhesive 0210 nano-technology Phosphoric acid Nuclear chemistry |
| Zdroj: | International Journal of Adhesion and Adhesives. 74:107-114 |
| ISSN: | 0143-7496 |
| Popis: | Purpose To evaluate the effect of different pHs of 40% meta phosphoric acid (MPA) in comparison with a conventional 37% ortho-phosphoric acid under different application times in terms of resin-dentin bond strength (μTBS), nanoleakage (NL) and the dentin-etching pattern. Materials and methods Ninety-six molars were randomly assigned into 12 experimental conditions according to the combination of the independent variables: Acid [37% ortho-phosphoric acid (OPA), 40% meta-phosphoric acid (MPA) in the following pHs – 0.5, 1 and 2] and Application Time [7, 15 and 30 s]. After restorations, specimens were sectioned into resin–dentine beams (0.8 mm2) tested under tension (0.5 mm/min). Selected beams from each tooth were used for NL evaluation. The dentin-etching pattern of the OPA and MPA was examined under a scanning electron microscop. Acid vs application time data were subjected to two-way ANOVA and Tukey's test (α=0.05) Results MPA pH 0.5 showed μTBS means similar to OPA, independently the application time (p>0.05). A statistically higher NL was observed for OPA in comparison with MPA, regardless the application time (p Conclusion The use of 40% meta-phosphoric acid with pH 0.5 is an alternative acid-etching agent with similar immediate bond strength and lower nanoleakage than the traditional 37% ortho-phosphoric acid. |
| Databáze: | OpenAIRE |
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