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Effect of oxidation heat treatment on the bond strength between a ceramic and cast and milled cobalt–chromium alloys
Author(s) -
Li Jieyin,
Ye Xiuhua,
Li Bohua,
Liao Juankun,
Zhuang Peilin,
Ye Jiantao
Publication year - 2015
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/eos.12199
Subject(s) - bond strength , materials science , ceramic , cobalt , alloy , chromium , metallurgy , microstructure , scanning electron microscope , composite material , adhesive , layer (electronics)
There is a dearth of dental scientific literature on the effect of different oxidation heat treatments ( OHT s) (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 OHT s 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 ISO 9693. 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.