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Impact of Curing Protocol on Conversion and Shrinkage Stress

¹ Department of Chemical & Biological Engineering, Engineering Center, ECCH 111, University of Colorado at Boulder, Boulder, CO 80309-0424, USA; and
² Department of Restorative Dentistry, University of Colorado Health Sciences Center, Denver, CO 80262, USA;

View larger version (15K): [in this window] [in a new window]   Figure 1. Double-bond conversion vs. time (a) and shrinkage stress vs. time (b) for Bis-GMA/TEGDMA/OX-50 (49/21/30 by wt; Initiator, CQ 0.21 wt%; EDAB, 0.56 wt%) cured with 3 different curing protocols at T0 = 23°C: STAN, 450 mW/cm2 for 60 sec (—); SOFT, 100 mW/cm2 for 5 sec, followed by 450 mW/cm2 for 60 sec (– –); PULSE, 100 mW/cm2 for 5 sec, wait for 2 min, followed by 450 mW/cm2 for 60 sec (...). Vertical bar represents standard deviation. Estimate of variability is shown in the Table (n = 3).

View larger version (13K): [in this window] [in a new window]   Figure 2. Sample temperature vs. time for Bis-GMA/TEGDMA/OX-50 (49/21/30 by wt; Initiator, CQ 0.21 wt %; EDAB, 0.56 wt%) cured with 3 different curing protocols at T0 = 23°C: STAN, 450 mW/cm2 for 60 sec (—); SOFT, 100 mW/cm2 for 5 sec, followed by 450 mW/cm2 for 60 sec (– –); PULSE, 100 mW/cm2 for 5 sec, wait for 2 min, followed by 450 mW/cm2 for 60 sec (...). Vertical bar represents standard deviation. Estimate of variability is shown in the Table (n = 3).

View larger version (14K): [in this window] [in a new window]   Figure 3. Shrinkage stress as a function of double-bond conversion for Bis-GMA/TEGDMA/OX-50 (49/21/30 by wt; Initiator, CQ 0.21 wt%; EDAB, 0.56 wt%) cured with 3 different curing protocols at T0 = 23°C: STAN, 450 mW/cm2 for 60 sec (—); SOFT, 100 mW/cm2 for 5 sec, followed by 450 mW/cm2 for 60 sec (– –); PULSE, 100 mW/cm2 for 5 sec, wait for 2 min, followed by 450 mW/cm2 for 60 sec (...). Each curve represents the average of 3 replicate runs (n = 3).

Journal of Dental Research, Vol. 84, No. 9, 822-826 (2005)
DOI: 10.1177/154405910508400908


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