It is intended to provide a dental material formed by using a hydroxy apatite, which is suitable for performing the guided bone regeneration (GBR) method in the implant therapy of dentistry. Also, it is intended to provide a composite dental material which is a bioabsorbable film provided integrally with hydroxy apatite, which is capable of rapidly attracting the osteoblast and blocking the fibroblast. The dental material is a membrane to be used for a guided bone regeneration method of guiding a bone formation by preventing invasion by anaplastic fibroblast by covering a bone developing site with a blocking membrane and filling the bone developing site with osteoblast, wherein a membrane main body of the blocking membrane is formed by using hydroxy apatite having osteoconductive capability of rapidly attracting osteoblast for the purpose of disposing the hydroxy apatite at a bone developing site side of the membrane main body. The composite dental material is a membrane to be used for a guided bone regeneration method of guiding a bone formation by preventing invasion by anaplastic fibroblast by covering a bone developing site with a blocking membrane and filling the bone developing site with osteoblast, wherein a membrane main body of the blocking membrane is formed by using a bioabsorbable membrane, and the bioabsorbable membrane is integrally provided with hydroxy apatite having osteoconductive capability of rapidly attracting osteoblast and a structure of being disposed at a bone developing site side of the membrane main body.
