There have been some reported negative effects on dental hard tissues associated with tooth bleaching. This in situ study evaluated the effect of 10% carbamide peroxide dental bleach on the dentin fracture toughness and microhardness. Compact tension fracture toughness dentin specimens, were prepared from extracted molars, irradiated and fitted into custom-made bleaching trays. The bleaching trays were loaded with either bleach (10% Carbamide Peroxide gel, Opalescence, Ultradent, n=34) or placebo gel (control group, n=31) and worn overnight for approximately 14 nights. Dentin specimens were tested 24-48 hrs after the end of treatment. The mean values for dentin fracture toughness were: 2.22 ± 0.71 & 2.26 ± 0.86 (MPa m ½) and for microhardness were: 66.80 ± 40.14 & 53.35± 42.52 (KHN) for bleaching and control respectively. Independent t-test showed no significant difference in dentin fracture toughness and microhardness after 14 days of in situ bleaching using 10% carbamide peroxide.
| Identifer | oai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/33328 |
| Date | 20 November 2012 |
| Creators | Bahrami, Parvaneh |
| Contributors | Tam, Laura |
| Source Sets | University of Toronto |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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