The Effect of Radiotherapy on Resin-dentin Bond Strength

DOI 1 Citations 15 References
  • YOSHIKAWA Takako
    Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University
  • WATTANAWONGPITAK Nipaporn
    Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University:Department of Restorative Dentistry, Faculty of Dentistry, Naresuan University
  • TAKAHASHI Hidekazu
    Advanced Biomaterials, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University
  • TAGAMI Junji
    Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University

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  • コンポジットレジン修復物の象牙質接着強さに及ぼす治療用放射線照射の影響

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Abstract

Radiotherapy for oral cancer causes radiation caries. This study evaluated the effect of γ-ray irradiation on resin/dentin bond strength, dentin microhardness and elastic modulus. One group of bovine incisors was irradiated with 60 Gy γ-rays using a cobalt 60 therapeutic machine. The control group of bovine incisors was not irradiated with γ-rays. Flat dentin surfaces were prepared on the labial side. The teeth were treated with the Clearfil SE Bond adhesive system. Clearfil AP-X hybrid composite was built up to 3×4×3 mm. The resins were light cured with 600mW/cm2 for 40s. After storage for 24h, the teeth were sectioned to about 1.0 mm thickness. The slabs were trimmed (ca. 1 mm2) at the adhesive-dentin interface for the micro-tensile bond strength test (μ-TBS). The trimmed specimens were mounted on a testing apparatus, and stressed to failure under tension at 1 mm/min in an EZ test machine. Nano-indentation hardness and elastic modulus on both dentin surfaces were measured using a nano-indentation tester. μ-TBS (n=10), nano hardness (n=20) and elastic modulus data (n=20) were analyzed using Fisher's PLSD test. There was no significant difference in μ-TBS between the intact group and irradiated group (p>0.05). Nano hardness and elastic modulus of the irradiated group were significantly lower than those of the intact group (p<0.05). Irradiation with 60 Gy γ-rays had no effect on resin/dentin bond strength. However, 60 Gy γ-ray irradiation significantly decreased the microhardness and elastic modulus of dentin.

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