›› 2019, Vol. 39 ›› Issue (5): 395-399.

• Basic Research • Previous Articles     Next Articles

Conversion degree analysis of Bis-GMA based resin materials under 40 seconds’ light irradiation

  

  • Received:2018-11-07 Revised:2018-12-08 Online:2019-05-28 Published:2019-05-21

Abstract: Objective To evaluate conversion degrees of light-cured resins under 40s light irradiation. Methods Fourier transform infrared spectroscopy (FTIR) was used to study the effect of 40 seconds’ irradiation on the conversion degrees of two kinds of light-cured composite resins Filtek Z100, Z350, one kind of light-cured resin cement Relyx Veneer and one kind of dual-cured resin cement Nexus 3 (NX3) when placed for 24 hours and two weeks. Results For all the groups, the degree of double bond conversion of resin was only about 50% after 40 seconds’ irradiation, and the conversion degrees increased along with the storage time. When stored for the same amount of time, conversion degree of Z350 composite resin was higher than that of Z100, while for resin cements it was higher in Relyx Veneer group. Conclusion 40 seconds’ irradiation is not sufficient to make the resin polymerized completely.

Key words: resin, degree of conversion, fourier transform infrared spectroscopy

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