Abstract
We propose a new method for fabricating the hydroxyapatite (HAp) film in the atmosphere by the laser
ablation method using Er:YAG laser. The HAp films were deposited on the Ti substrate by ablation reaction
by the Er:YAG laser irradiated to target of several kinds of calcium phosphate compounds. Subsequently, the
deposited film was changed to a material with HAp like structure by hydrolysis reaction with the pure water
in film surface. It became clear that α-tricalcium phosphate (α-TCP) had the early sedimentation rate and
that it changes to the HAp structure within 48 hours. Further, it was proven that the film became the HAp
structure in about 3 hours, when it formed a TCP films by applying monocalcium phosphate solution with the
pH 5.5 on the enamel surface. The interface of enamel and deposited layer is observed by scanning electron
microscope (SEM), and it was confirmed that dense HAp film with the thickness of about 10～20μm had been
formed on the enamel. It seems that the technique becomes the technology which will be very useful for the
repair of the dentine in future.
