title: Effect of oxidation heat treatment on the bond strength between a ceramic and cast and milled cobalt-chromium alloys.
abstract: There is a dearth of dental scientific literature on the effect of different oxidation heat treatments (OHTs) (as surface pretreatments) on the bonding performance of cast and milled cobalt-chromium (CoCr) alloys. The objective of this study was to evaluate the effect of different OHTs on the bond strength between a ceramic and cast and milled CoCr alloys. Cobalt-chromium metallic specimens were prepared using either a cast or a milled method. Specimens were subjected to four different OHT methods: without OHT; OHT under normal atmospheric pressure; OHT under vacuum; and OHT under vacuum followed by sandblasting. The metal-ceramic bond strength was evaluated using a three-point bending test according to ISO9693. Scanning electron microscopy and energy-dispersive spectroscopy were used to study the specimens' microstructure and elemental composition. The bond strength was not affected by the CoCr manufacturing method. Oxidation heat treatment performed under normal atmospheric pressure resulted in the highest bond strength. The concentration of oxygen on the alloy surfaces varied with the different pretreatment methods in the following order: OHT under normal atmospheric pressure > OHT under vacuum > without OHT ≈ OHT under vacuum followed by sandblasting.
authors.affiliation: Department of Prosthodontics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.|Department of Stomatology, Jieyang People's Hospital, Jieyang, China.
authors.forename: Jieyin
authors.initials: J
authors.lastname: Li
authors.affiliation: Department of Prosthodontics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.
authors.forename: Xiuhua
authors.initials: X
authors.lastname: Ye
authors.affiliation: Department of Stomatology, Henan Provincial People's Hospital, Zhengzhou, China.
authors.forename: Bohua
authors.initials: B
authors.lastname: Li
authors.affiliation: Department of Prosthodontics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.
authors.forename: Juankun
authors.initials: J
authors.lastname: Liao
authors.affiliation: Department of Prosthodontics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.
authors.forename: Peilin
authors.initials: P
authors.lastname: Zhuang
authors.affiliation: Department of Prosthodontics, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.
authors.forename: Jiantao
authors.initials: J
authors.lastname: Ye
mesh_terms: D000535:Aluminum / Q000032:analysis; D000537:Aluminum Oxide / Q000737:chemistry; D001274:Atmospheric Pressure; D002857:Chromium / Q000032:analysis; D002858:Chromium Alloys / Q000737:chemistry*; D003035:Cobalt / Q000032:analysis; D017076:Computer-Aided Design; D001840:Dental Bonding; D003734:Dental Casting Investment / Q000737:chemistry; D045662:Dental Etching / Q000379:methods; D003776:Dental Porcelain / Q000737:chemistry*; D006358:Hot Temperature; D006801:Humans; D008422:Materials Testing; D016876:Metal Ceramic Alloys / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis / Q000737:chemistry; D018583:Pliability; D012825:Silicon / Q000032:analysis; D013052:Spectrometry, X-Ray Emission; D013314:Stress, Mechanical; D013499:Surface Properties; D014414:Tungsten / Q000032:analysis; D014618:Vacuum
chemical_list: D002858:Chromium Alloys; D003734:Dental Casting Investment; D016876:Metal Ceramic Alloys; D002857:Chromium; D003776:Dental Porcelain; D003035:Cobalt; D000535:Aluminum; D000537:Aluminum Oxide; D010100:Oxygen; D014414:Tungsten; D012825:Silicon
keywords: compressive strength; computer-aided design; electron probe microanalysis; porcelain-metal alloys; scanning electron microscopy