title: Dentin surface treatment using a non-thermal argon plasma brush for interfacial bonding improvement in composite restoration.
abstract: 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.
authors.affiliation: Center for Surface Science and Plasma Technology, Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65211, USA.
authors.forename: Andy C
authors.initials: AC
authors.lastname: Ritts
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.forename: Qingsong
authors.initials: Q
authors.lastname: Yu
authors.forename: Changqi
authors.initials: C
authors.lastname: Xu
authors.forename: Xiaomei
authors.initials: X
authors.lastname: Yao
authors.forename: Liang
authors.initials: L
authors.lastname: Hong
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
mesh_terms: 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
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D058626:Plasma Gases; D019279:Resin Cements; D001128:Argon