Journal
EUROPEAN JOURNAL OF ORAL SCIENCES
Volume 118, Issue 5, Pages 510-516Publisher
WILEY
DOI: 10.1111/j.1600-0722.2010.00761.x
Keywords
bonding strength; composite restoration; plasma treatment
Categories
Funding
- US National Science Foundation (NSF) [NSF-CBET-0730505]
- US National Institute of Health (NIH) [1R43DE019041-01A1]
- US Department of Education (DOE)
- NATIONAL INSTITUTE OF DENTAL &CRANIOFACIAL RESEARCH [R43DE019041] Funding Source: NIH RePORTER
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The objective of this study was to investigate the treatment effects of non-thermal atmospheric gas plasmas on dentin surfaces used for composite restoration. Extracted unerupted human third molars were prepared by removing the crowns and etching the exposed dentin surfaces with 35% phosphoric acid gel. The dentin surfaces were treated using a non-thermal atmospheric argon plasma brush for various periods of time. The molecular changes of the dentin surfaces were analyzed using Fourier transform infrared spectrophotometry/attenuated total reflectance (FTIR/ATR), and an increase in the amount of carbonyl groups was detected on plasma-treated dentin surfaces. Adper Single Bond Plus adhesive and Filtek Z250 dental composite were applied as directed. To evaluate the dentin/composite interfacial bonding, the teeth thus prepared were sectioned into micro-bars and analyzed using tensile testing. Student-Newman-Keuls tests showed that the bonding strength of the composite restoration to peripheral dentin was significantly increased (by 64%) after 30 s of plasma treatment. However, the bonding strength to plasma-treated inner dentin did not show any improvement. It was found that plasma treatment of the peripheral dentin surface for up to 100 s resulted in an increase in the interfacial bonding strength, while prolonged plasma treatment of dentin surfaces (e.g. 5 min) resulted in a decrease in the interfacial bonding strength.
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