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Characteristics of hydroxyapatite film formed on human enamel with the powder jet deposition technique
Author(s) -
Akatsuka Ryo,
Sasaki Keiichi,
Zahmaty Mohammed Saeed Sepasy,
Noji Miyoko,
Anada Takahisa,
Suzuki Osamu,
Kuriyagawa Tsunemoto
Publication year - 2011
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.31781
Subject(s) - enamel paint , materials science , composite material , scanning electron microscope , substrate (aquarium) , microstructure , indentation hardness , bond strength , vickers hardness test , composite number , deposition (geology) , layer (electronics) , adhesive , paleontology , oceanography , sediment , biology , geology
This study aimed to create hydroxyapatite (HAp) film by powder jet deposition with manipulating the blasting nozzle above human enamel and to examine the microstructural and mechanical properties of the HAp film and the bonding strength at the interface between the HAp film and the enamel substrate. HAp particles calcinated at 1200°C with an average size of 4.7 μm were used. The HAp particles were mixed with carrier gas (N 2 ) to form an aerosol flow and was accelerated and blasted from the nozzle onto the enamel substrate at room temperature and atmospheric pressure. To evaluate the microstructure, scanning electron microscope (SEM) images of the surface and cross section of the HAp films and a three‐dimensional profile of the HAp films were observed. To evaluate the mechanical properties, the micro‐Vickers hardness and the bonding strength of the HAp films to the enamel substrate were measured. The deposition area of the HAp film was over 3 × 4 mm. The average and maximum thickness were about 30 and 40 μm, respectively. No significant difference was observed between the hardness of the HAp film and the enamel ( p > 0.05). The bonding strength of the HAp film was the same as the bonding strength between composite resin and enamel. Compared with previous reports, wider and thicker HAp film was created on the enamel substrate successfully. The HAp film, which has same hardness with enamel and same bonding strength to the enamel with composite resin, would be a candidate as dental restorative materials. © 2011 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2011.