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Minimizing Dentinal Fluid Flow Associated with Gap Formation

Department of Restorative Dentistry, School of Dental Science, The University of Melbourne, 720 Swanston Street, Melbourne, Victoria 3010, Australia

View larger version (17K): [in a new window]   Figure 1. Outward fluid flow behavior for 15 min after light-curing of resin composite. Outward fluid flow of liner groups (conventional and light-cured GIC) stopped earlier than that of bonding groups (low-shrinkage and high-shrinkage resin groups), which exhibited continuing outward fluid flow for at least 15 min. Only the mean values (n = 8 teeth per group except for the conventional GIC group, n = 7) are shown for clarity. The standard deviation for each group was typically in the range 10–20% of the mean. LC-GIC = light-cured glass-ionomer cement; C-GIC = conventional glass-ionomer cement; LSC = low-shrinkage composite; HSC = high-shrinkage composite.

View larger version (132K): [in a new window]   Figure 2. Scanning electron micrograph of an epoxy replica of the high-shrinkage composite-dentin interface, showing a gap between dentin and resin composite approximately 5 µm in width. D = dentin; C = resin composite.