Bond strength of metal bracket to enamel using orthodontic resin-modified glass ionomer cements – Effect of thermal cycle and powder-liquid ratios on bond strength –

DOI
  • MINEGISHI Shiho Tomita
    Division of Orthodontics, Department of Human Development and Fostering, Meikai University School of Dentistry
  • HIBINO Yasushi
    Division of Dental Biomaterials Science, Department of Restorative and Biomaterials Sciences, Meikai University School of Dentistry
  • NAKAJIMA Hiroshi
    Division of Dental Biomaterials Science, Department of Restorative and Biomaterials Sciences, Meikai University School of Dentistry
  • SUDA Naoto
    Division of Orthodontics, Department of Human Development and Fostering, Meikai University School of Dentistry

Bibliographic Information

Other Title
  • 矯正歯科用レジン添加型グラスアイオノマーセメントを用 いたメタルブラケットとエナメル質の接着強さ ─サーマルサイクルと粉液比が接着強さに及ぼす影響─

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Abstract

This study examined the effect of powder-liquid mixing ratios and thermal cycling on the bond strength of orthodontic resin-modified glass ionomer cements to bovine enamel. Using commercially-available chemical-cured type or light-cured type resin-modified glass ionomer cements, the standard metal brackets adhered on the fresh bovine enamel surfaces. The powder-liquid mixing ratios used were the manufacturer’s recommended ratio, as well as the ratios with 20% more or less powder than the manufacturer’s recommended ratio. After the brackets were bonded on the enamel, the following specimens were prepared: specimens kept moist (23°C, 95% RH) for 24 h; specimens subjected to thermal cycling (5–55°C, 2,000 cycles) after the 24-hour moist storage; and specimens stored in 37°C water for the duration equal to that of the thermal cycling used (111 h). The shear bond strengths of the brackets were determined immediately after each aging condition (n = 20). The light-cured type cement had significantly (p < 0.05) greater mean bond strength than the chemical-cured type cement in all experimental conditions. Thermal cycling showed no significant effect (p > 0.05) on the bond strengths of light-cured type cement within ±20% of deviation of mixing ratio from the standard ratio. The strength data and Weibull analysis suggested that the light-cured type cement has more stable bond strength than the chemical-cured type cement.

Journal

  • Adhesive Dentistry

    Adhesive Dentistry 34 (2), 68-81, 2016

    Japan Society for Adhesive Dentistry

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