Implant Surface Modification Using Laser Guided Coatings: In Vitro Comparison of Mechanical Properties
Open Access
- 1 July 2008
- journal article
- research article
- Published by Wiley in Journal of Prosthodontics
- Vol. 17 (5), 357-364
- https://doi.org/10.1111/j.1532-849x.2008.00307.x
Abstract
Plasma-sprayed hydroxyapatite (HA)-coated implants show failures along the coating-substrate interface due to poor bond strength. We analyzed HA coatings obtained by pulsed laser deposition (PLD) and compared them to commercially used plasma-sprayed coatings with respect to their bond strength to titanium alloy (Ti-6Al-4V), as well as surface roughness alterations produced by each of the two deposition methods. Twelve titanium alloy disks were plasma-sprayed under commercial implant coating conditions, and 24 titanium alloy disks were coated using PLD. All coatings were characterized by the presence of the different calcium phosphate (CaP) phases. The plasma-sprayed coatings (n = 12) were predominantly HA, and the pulsed laser-deposited coatings were hydroxydyapatite (n = 12) and HA coating with a tetra calcium phosphate (TTCP) phase (n = 12). The surface roughness was analyzed before and after the coating processes to assess roughness changes to the surface by the coatings. The adhesive bond strengths of these coatings to the substrate titanium alloy was tested and compared. Scheffé's test was used to analyze the statistical significance of the data. The surface roughness alteration following PLD was a decrease of 0.2 mum, whereas following plasma spraying the decrease was 1.0 microm. Bond strengths were as follows [mean (SD) in MPa]: pulsed laser-deposited HA coatings: 68.3 (17.8); pulsed laser-deposited HA with tetra-CaP: 55.2 (21.1); plasma-sprayed HA 17.0 (2.8). The multivariate Scheffé's test revealed that HA coatings obtained by PLD had significantly increased bond strengths compared with the plasma sprayed ones (p<or= 0.05). HA coatings obtained by PLD showed greater adherence to titanium alloy. PLD offers an alternative method to produce thinner coatings with better adherence properties, along with precise control over the deposition process.Keywords
This publication has 13 references indexed in Scilit:
- Pulsed laser ablation and deposition of thin filmsChemical Society Reviews, 2003
- Influence of residual stress on bonding strength and fracture of plasma-sprayed hydroxyapatite coatings on Ti–6Al–4V substrateBiomaterials, 2001
- Structural and morphological study of pulsed laser deposited calcium phosphate bioceramic coatings: Influence of deposition conditions, laser parameters, and target propertiesJournal of Biomedical Materials Research, 2000
- The study of surface transformation of pulsed laser deposited hydroxyapatite coatingsJournal of Biomedical Materials Research, 2000
- Bone growth on and resorption of calcium phosphate coatings obtained by pulsed laser depositionJournal of Biomedical Materials Research, 1999
- Addressing processing problems associated with plasma spraying of hydroxyapatite coatingsBiomaterials, 1996
- Excimer laser deposition of hydroxyapatite thin filmsBiomaterials, 1994
- Post-deposition heat treatments for ion beam sputter deposited calcium phosphate coatingsBiomaterials, 1994
- In vitro evaluation of amorphous calcium phosphate and poorly crystallized hydroxyapatite coatings on titanium implantsJournal of Biomedical Materials Research, 1993
- Structure, solubility and bond strength of thin calcium phosphate coatings produced by ion beam sputter depositionBiomaterials, 1992