歯冠前装用材料の耐摩耗性について

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Abrasion resistance of veneer materials for crown and bridge was examined by using the brushing machine of unidirectional rolling type. The veneer materials used are thermosetting resin with or without pre-treatment, light-activated microfilled composite resin, porcelain and heat-cured acrylic resin. The pre-treatment of the thermosetting resin consisted of storing the material under reduced pressure before curing to eliminate the pores. The changes in surface aspect was evaluated by abrasion loss, gloss change, photomicrograph and surface roughness. The measurements were taken before brushing and after 10, 000, 20, 000, 30, 000, 40, 000, and 50, 000 times brushing tests. The results obtained were as follows : 1. Thermosetting resin and pre-treated thermosetting resin showed the same abrasion loss as acrylic resin. Light-activated composite resin showed abrasion loss about 1/3∿1/4 times more than acrylic resin. Porcelain showed little abrasion loss, compared with the others. 2. Crown and bridge resins, including thermosetting resin, pre-treated thermosetting resin and light-activated composite resin showed lower specular gloss as brushing times increased. It was found that porcelain and acrylic resin had no change in gloss. Pre-treated thermosetting resin had a tendency of higher gloss than thermosetting resin without pre-treatment. 3. It was observed that the abrasion was dominant around the surface porosity. 4. Porosities in the thermosetting resins became smaller in their size and number by storing under reduced pressure, resulting in a tendency of lower abrasion loss and less surface roughness.
九州歯科学会の論文
1990-04-25

歯冠前装用材料の耐摩耗性について

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