Effect of Gamma Irradiation on Ultimate Tensile Strength of Enamel and Dentin

SAGE Publications - Tập 89 Số 2 - Trang 159-164 - 2010
Carlos José Soares1,2, C. G. Castro1,2, N.A. Neiva1,2, Paulo Vinícius Soares1,2, Paulo César Freitas Santos‐Filho1,2, Lucas Zago Naves1,2, Patricia N R Pereira1,2
1Biomechanics Group, School of Dentistry, Federal University of Uberlândia, Dept. of Operative Dentistry and Dental Materials, Av. Pará 1720, Bloco 2B, Sala 2B-24, Campus Umuarama, Uberlândia, MG 38400-902, Brazil; and
2Department of Operative Dentistry, University of North Carolina, Chapel Hill, NC, USA

Tóm tắt

The effect of gamma irradiation therapy on the ultimate tensile strength (UTS) of enamel and dentin in relation to prism orientation, dentin tubule orientation, and location is unknown. It was hypothesized that tubule and prism orientation, location, and irradiation have an effect on the UTS of dental structures. Forty human third molars were used, half of which were subjected to 60 Gy of gamma irradiation, in daily increments of 2 Gy. The specimens were evaluated by microtensile testing. Results showed that irradiation treatment significantly decreased the UTS of coronal and radicular dentin and of enamel, regardless of tubule or prism orientation. With or without irradiation, enamel was significantly stronger when tested parallel to its prismatic orientation. Coronal and radicular dentin of non-irradiated specimens presented significantly higher UTS when tested perpendicularly to tubule orientation. However, when the teeth were irradiated, the influence of tubule orientation disappeared, demonstrating that irradiation is more harmful to organic components.

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SAGE Publications

Tập 89 Số 2

159-164

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