Keyword
biomaterials, tooth filling materials, preventive materials for caries, glass ionomer cement, hydroxyapatite

Field of Industrial Application
●Pit and fissure sealant
●Dental filling materials (for prepared and unprepared cavities)
●Bone filling materials

●Technical Field                    ：Dental and medical
●Influence of the Invention    ：Dental filling, bone filling materials, pit and fissure, sealant Caries prevention
●Purpose of the Invention      ：Improvement of chemically-curing type GIC
●Advantage of the Invention  ：Mechanical strength is the same or higher than that of light -curing GIC. 
                                                Sustained fluoride release and and its recharge characteristics are better
                                                than hose of light-curing or conventional chemically-curing GIC
                                                The disadvantages of light-curing GIC are eliminated.

Abstract
At present, light-curing GIC is in the mainstream in the field of dentistry because it has stronger mechanical property than chemically-curing GIC.  However, it has disadvantages as follows: lower biological affinity, smaller amount of sustained fluoride release, necessity of tooth surface treatment and a light irradiation device, etc.  
The inventor found the characteristics of chemically-curing GIC were significantly improved when hydroxyapatite (HA) particulates of certain size (mean diameter: 0.6-100μm) were added.

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