title: Promotion of adhesive penetration and resin bond strength to dentin using non-thermal atmospheric pressure plasma.
abstract: Non-thermal atmospheric pressure plasmas (NT-APPs) have been shown to improve the bond strength of resin composites to demineralized dentin surfaces. Based on a wet-bonding philosophy, it is believed that a rewetting procedure is necessary after treatment with NT-APP because of its air-drying effect. This study investigated the effect of 'plasma-drying' on the bond strength of an etch-and-rinse adhesive to dentin by comparison with the wet-bonding technique. Dentin surfaces of human third molars were acid-etched and divided into four groups according to the adhesion procedure: wet bonding, plasma-drying, plasma-drying/rewetting, and dry bonding. In plasma treatment groups, the demineralized dentin surfaces were treated with a plasma plume generated using a pencil-type low-power plasma torch. After the adhesion procedures, resin composite/dentin-bonded specimens were subjected to a microtensile bond-strength test. The hybrid layer formation was characterized by micro-Raman spectroscopy and scanning electron microscopy. The plasma-drying group presented significantly higher bond strength than the wet-bonding and dry-bonding groups. Micro-Raman spectral analysis indicated that plasma-drying improved the penetration and polymerization efficacy of the adhesive. Plasma-drying could be a promising method to control the moisture of demineralized dentin surfaces and improve the penetration of adhesive and the mechanical property of the adhesive/dentin interface.
authors.affiliation: Department of Conservative Dentistry, Seoul National University School of Dentistry & Dental Research Institute, Seoul, Korea.
authors.forename: Jae-Hoon
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Dental Biomaterials Science, Seoul National University School of Dentistry & Dental Research Institute, Seoul, Korea.
authors.forename: Geum-Jun
authors.initials: GJ
authors.lastname: Han
authors.affiliation: School of Chemical Engineering and Materials Science, Chung-Ang University, Seoul, Korea.
authors.forename: Chang-Keun
authors.initials: CK
authors.lastname: Kim
authors.affiliation: Department of Materials Science & Engineering, Seoul National University, Seoul, Korea.
authors.forename: Kyu-Hwan
authors.initials: KH
authors.lastname: Oh
authors.affiliation: N.B.T., Geumcheon-gu, Seoul, Korea.
authors.forename: Sung-No
authors.initials: SN
authors.lastname: Chung
authors.affiliation: N.B.T., Geumcheon-gu, Seoul, Korea.
authors.forename: Bae-Hyeock
authors.initials: BH
authors.lastname: Chun
authors.affiliation: Department of Conservative Dentistry, Seoul National University School of Dentistry & Dental Research Institute, Seoul, Korea.
authors.forename: Byeong-Hoon
authors.initials: BH
authors.lastname: Cho
mesh_terms: D000269:Adhesives; D003188:Composite Resins; D001840:Dental Bonding; D003804:Dentin; D017220:Dentin-Bonding Agents; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D058626:Plasma Gases; D019279:Resin Cements; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D000269:Adhesives; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D058626:Plasma Gases; D019279:Resin Cements
keywords: adhesives; bond strength; micro-Raman spectroscopy; scanning electron microscopy