Push‐out strength of hydroxyapatite coated by sputtering technique in bone

Abstract

Hydroxyapatite was coated with 1 μm thickness on titanium columns of a length of 10 mm, an outer diameter of 4.0 mm by radio frequency magnetron sputtering. The hydroxyapatite coating titanium columns were implanted in the diaphysis of femora of 3 adult dogs, and push‐out test was carried out after 2, 4 and 12 weeks of implantation using a testing machine. The interface of bone/column was observed histologically after the test. At 12 weeks the push‐out strengths of coating and non‐coating columns were 3.5 and 1 MPa, respectively. Histological observation indicated a formation of thin connective tissue with 5∼30 μm thickness at the interface of the bone/column. No inflammation was observed during the implantation periods.