J Periodontal Implant Sci.  2012 Apr;42(2):59-63. 10.5051/jpis.2012.42.2.59.

Surface characteristics of a novel hydroxyapatite-coated dental implant

• Jung UW
• Hwang JW
• Choi DY
• Hu KS
• Kwon MK
• Choi SH
• Kim HJ

• KMID: 2027788
• DOI: http://doi.org/10.5051/jpis.2012.42.2.59

Abstract

PURPOSE
This study evaluated the surface characteristics and bond strength produced using a novel technique for coating hydroxyapatite (HA) onto titanium implants.
METHODS
HA was coated on the titanium implant surface using a super-high-speed (SHS) blasting method with highly purified HA. The coating was performed at a low temperature, unlike conventional HA coating methods. Coating thickness was measured. The novel HA-coated disc was fabricated. X-ray diffraction analysis was performed directly on the disc to evaluate crystallinity. Four novel HA-coated discs and four resorbable blast medium (RBM) discs were prepared. Their surface roughnesses and areas were measured. Five puretitanium, RBM-treated, and novel HA-coated discs were prepared. Contact angle was measured. Two-way analysis of variance and the post-hoc Scheffe's test were used to analyze differences between the groups, with those with a probability of P<0.05 considered to be statistically significant. To evaluate exfoliation of the coating layer, 7 sites on the mandibles from 7 mongrel dogs were used. Other sites were used for another research project. In total, seven novel HA-coated implants were placed 2 months after extraction of premolars according to the manufacturer's instructions. The dogs were sacrificed 8 weeks after implant surgery. Implants were removed using a ratchet driver. The surface of the retrieved implants was evaluated microscopically.
RESULTS
A uniform HA coating layer was formed on the titanium implants with no deformation of the RBM titanium surface microtexture when an SHS blasting method was used.
CONCLUSIONS
These HA-coated implants exhibited increased roughness, crystallinity, and wettability when compared with RBM implants.

Keyword

Biocompatible coated materials; Dental implants; Hydroxyapatites; Titanium

MeSH Terms

Animals
Bicuspid
Coated Materials, Biocompatible
Crystallins
Dental Implants
Dogs
Durapatite
Hydroxyapatites
Mandible
Titanium
Wettability
X-Ray Diffraction
Coated Materials, Biocompatible
Crystallins
Dental Implants
Durapatite
Hydroxyapatites
Titanium

Figure

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  Figure 1 Thickness of the hydroxyapatite (HA) coating layer, as observed using field-emission scanning electron microscopy. The titanium substrate was coated with a thin HA layer whose thickness was within the range of 1 to 2 µm.

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  Figure 2 Surface topography of the implant, as observed using field-emission scanning electron microscopy: (A) Original magnification, ×50. (B) Original magnification, ×5,000.

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  Figure 3 Surface hydroxyapatite (HA) crystallinity analysis. Multipurpose X-ray diffractometer analysis revealed that only HA was present on the disc surface.

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  Figure 4 Contact angle between the water drop and the substratum: (A) Pure-titanium surface, (B) resorbable blast medium surface, and (C) hydroxyapatite-coated surface.

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  Figure 5 Implant surface after removal from a pig bone segment, as observed using field-emission scanning electron microscopy: (A) Original magnification, ×1,000. (B) Original magnification, ×5,000.

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