Mechanical and biological properties of apatite composite resins.
Well-crystallized hydroxyapatite was synthesized at 80 degrees C and pH 7.4, and mixed as filler with 2.2'(4-methacryloxydiethoxyphenyl) propane. BPO and DHPT were used as polymerization initiators. The compressive strength and Knoop hardness of the apatite composite resins increased with the increase of apatite content, and approached a plateau above an apatite-resin ratio (Ap/R) of 1. The thermal expansion coefficient of the composite with apatite-resin ratio Ap/R = 1 was almost equal to that of teeth. In tooth cavities, the composites seemed to adhere well to enamel without a bonding agent. The biocompatibility of the composites implanted hypodermically into rats appeared to improve with the increase of apatite content, and implants showed no significant inflammation after 1 wk and 4 wk.
Okazaki
M
M
Department of Dental Technology, Osaka University Faculty of Dentistry, Japan.
Ohmae
H
H
D000179:Acrylates; D000818:Animals; D001672:Biocompatible Materials; D017886:Durapatite; D006882:Hydroxyapatites / Q000138:chemical synthesis; D008689:Methacrylates; D008854:Microscopy, Electron; D019736:Prostheses and Implants; D051381:Rats; D012116:Resins, Plant; D012867:Skin / Q000166:cytology; D013054:Spectrophotometry, Atomic; D014961:X-Ray Diffraction
D000179:Acrylates; D001672:Biocompatible Materials; D006882:Hydroxyapatites; D008689:Methacrylates; D012116:Resins, Plant; C058407:2,2'-(4-methacryloxydiethoxyphenyl)propane; D017886:Durapatite