サブミクロンTCPの小窩裂溝填塞材としての応用に関する基礎的研究
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The current fissure sealant is not efficient with respect to its attainability and seal ability for deep pits and fissures. Therefore, the author synthesized submicron α-tertiary calcium phosphate (TCP) using the aqueous mechanochemical method. The author analyzed the application of the synthesized α-TCP as a packing material for the pit and fissure utilizing a pit and fissure model. The α-TCP was selected for investigation due to its qualities of affinity for the fissure, seal ability and reaction to hydration. Submicron α-TCP was synthesized utilizing the following method ; First, β-TCP was synthesized from a mixed slurry using an aqueous mechanochemical method. Then the β-TCP was dried at 80℃, and the β-TCP was calcinated at 1200℃ to become α-TCP. Ethanol was added to the α-TCP and then it was milled to make submicron α-TCP. The mesh distribution was measured by the dynamic light scattering method. The pit and fissure model was prepared by the following technique : A prototype of a pit and fissure was prepared by obtaining a resin impression of a pit and fissure. The impression was used for the preparation of a wax replicative model. The model was then burred after it had been solidified and hardened. The model was completed after it had been sintered. The process of packing the α-TCP into the model was performed as follows : A sample of α-TCP was applied to the opening of the model pit and fissure. Then the α-TCP was guided into the fissure using vibration from an ultrasound sealer and compressed distilled water was briefly applied to opening of the fissure model. The pressurized distilled water was quickly terminated and water was absorbed. The temperature was kept at 36.5℃ for a measured amount of time. The condition of the α-TCP at the fissure model was observed with light microscopy, scanning electron microscopy (SEM), X-ray powder diffraction and micro X-ray diffraction. The mesh distribution for the α-TCP that was measured by the dynamic light scattering method confirmed that 99% of the α-TCP was submicron particles under 532nm. Transposition of α-TCP to Hydroxyapatite (HAp) due to the reaction of hydration was obseved in vitro. After 12 hours the composition ratio of HAp exceeded the ratio of α-TCP and 72 hours later 100% of the α-TCP had been replaced by HAp. The combination of ultrasound vibration and distilled water compression was effective to pack the α-TCP densely into the" model of the pit and fissure that had an opening of 100μm. In this study α-TCP was transposed to HAp in 72 hours. However, increased crystallization was seen at the periphery of the fissure and lower crystallization was observed at the center of the fissure.
- 奥羽大学の論文
- 2005-06-30
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関連論文
- サブミクロンTCPの小窩裂溝填塞材としての応用に関する基礎的研究
- アパタイトファイバー スキャフォルド
- 5)サブミクロンTCPの小窩裂溝填塞材としての有用性に関する研究(第38回 奥羽大学歯学会例会講演抄録)