Dentin surface treatment using a non-thermal argon plasma brush for interfacial bonding improvement in composite restoration.
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.
Ritts
Andy C
AC
Center for Surface Science and Plasma Technology, Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA.
Li
Hao
H
Yu
Qingsong
Q
Xu
Changqi
C
Yao
Xiaomei
X
Hong
Liang
L
Wang
Yong
Y
D000134:Acid Etching, Dental; D001128:Argon; D003188:Composite Resins; D001840:Dental Bonding; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D003804:Dentin; D017220:Dentin-Bonding Agents; D006801:Humans; D058626:Plasma Gases; D019279:Resin Cements; D017550:Spectroscopy, Fourier Transform Infrared; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013718:Tensile Strength; D013997:Time Factors
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D058626:Plasma Gases; D019279:Resin Cements; D001128:Argon