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      Effect of high intensity vs. soft-start halogen irradiation on light-cured resin-based composites. Part II: Hardness and solubility.

      American journal of dentistry
      Analysis of Variance, Composite Resins, radiation effects, Dental Equipment, Dental Stress Analysis, Halogens, Hardness, Light, Materials Testing, Molecular Structure, Phase Transition, Resin Cements, Solubility

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          Abstract

          To determine hardness and solubility of light-cured resin-based composites after high intensity vs. soft-start quartz tungsten halogen irradiation. Knoop hardness of resin-based composite specimens was measured at 1.5 mm depth after dry storage for 24 hours at 37 degrees C so as to indirectly evaluate degree of cure. Solubility was determined gravimetrically by extraction of post-cured (24 hours, 37 degrees C) specimens in 50 wt% methanol for 72 hours. Four hybrid (Filtek Z250, Herculite, Solitaire 2, Tetric Ceram), an inhomogeneously filled hybrid (InTen-S) and a microfilled (Filtek A110, formerly Silux Plus) composite were cured using the quartz tungsten halogen units Astralis 10 and Optilux 501 in the high intensity (Astralis 10 High Power: 10 seconds @ 1300 mW/cm2; Optilux Boost: 10 seconds @ 1140 mW/cm2) or soft-start modes (Astralis 10 Pulse: increase to 700 mW/cm2 within 10 seconds, three periods of 2 seconds @ 1300 mW/cm2 alternating with two periods of 2 seconds @ 700 mW/cm2; Optilux Ramp: exponential increase within 10 seconds, followed by 10 seconds @ 1140mW/cm2). For the fast curing composites Z250, Tetric Ceram and InTen-S, equivalent hardness was observed after 10 seconds of high intensity and 20 seconds of soft-start irradiation. For the slower curing composites Herculite, Solitaire 2 and A110, the soft-start protocols produced higher hardness values. Regarding solubility however, the superiority of soft-start irradiation was also seen for Tetric Ceram and InTen-S. The lowest solubility was observed for InTen-S, followed by Z250, whereas Herculite and Solitaire 2 scored highest for this parameter.

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