Effects of Adhesives on Reliability in Interfacial Strength Evaluation Method for Plasma-Sprayed Hydroxyapatite Coating

Abstract

The purpose of this study is to evaluate interfacial strength of plasma-sprayed HAp coating by using more general adhesives. Plasma-sprayed HAp coating has been applied to bond bones with the surfaces of artificial hip joints. However, HAp coating is subjected to crack or delamination by mechanical loading. Conventional standard codes for measurement of interfacial strength of calcium phosphate coating determine the use of a specific adhesive irrationally. Our group previously proposed pre-immersion treatment process in preparation of interfacial testing specimens in order to obtain valid value of interfacial strength. However, the type of the adhesive was for medical purpose and not general one. To widen applicability of the proposed method, a selection policy of adhesive is indispensable. Metal Lock Y610 (ML adhesive) was selected as one of general adhesives. Interfacial strength tests by using ML adhesive were conducted. The results of interfacial strength test were compatible with the one reported by previous study, which suggest that the selection of general type of adhesive was successful. Raman spectroscopy analyses were also conducted to confirm a suppressed infiltration of ML adhesives.