Factors affecting the mechanical properties of glass ionomer cements for luting -Effect of powder-liquid ratio on compressive strength and fracture toughness-

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  • OMATSU Jun
    Division of Dental Biomaterials Science, Department of Restorative and Biomaterials Sciences, Meikai University School of Dentistry
  • NAGASAWA Yuko
    Division of Dental Biomaterials Science, Department of Restorative and Biomaterials Sciences, Meikai University School of Dentistry
  • HIBINO Yasushi
    Division of Dental Biomaterials Science, Department of Restorative and Biomaterials Sciences, Meikai University School of Dentistry

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  • 合着用グラスアイオノマーセメントの機械的性質に及ぼす要因 ― 粉液比が圧縮強さと破壊靭性値に及ぼす影響―
  • ガッチャクヨウ グラス アイオノマー セメント ノ キカイテキ セイシツ ニ オヨボス ヨウイン フンエキヒ ガ アッシュク ツヨサ ト ハカイ ジンセイチ ニ オヨボス エイキョウ

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Abstract

The purpose of this study was to test the effect of the powder-liquid ratio on the mechanical properties of glass ionomer cements for luting. Two conventional and three resin-modified glass ionomer cements for luting were tested. Each glass ionomer was mixed at three different ratios: (1) the manufacturer's recommended ratio; (2) 30% of the powder was subtracted from the recommended amount of powder for 1.0g liquid at the manufacturer's recommended ratio; (3) 30% of the powder was added to the recommended amount of powder for 1.0g liquid at the manufacturer's recommended ratio. The compressive strength and fracture toughness of the glass ionomer cements at 24 hours or 4 weeks after the start of mixing were determined. The compressive strengths of glass ionomers mixed at the highest powder-liquid ratio were greater than those at the lowest powder-liquid ratio, except for one conventional type cement after 4 weeks. The fracture toughness values of the conventional glass ionomers were lower compared to the resin-modified type at each cement mixing ratio. The fracture toughness of the resin-modified glass ionomers was less influenced by the powder-liquid ratio of the cement compared to conventional types. The present study showed a significant correlation between the compressive strength and the fracture toughness except for the conventional glass ionomers at 4 weeks. The mechanical strength of the conventional glass ionomer cements was affected more by the powder-liquid ratio of the cement compared to the resin-modified glass ionomers.

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