Unlabelled: Improvement of the appearance of teeth by whitening systems is one of the goals of modern esthetic dentistry. Vital tooth bleaching is administered in a variety of forms including trays, strips and paint-on gels. The concentrations and conditions of bleaching systems vary considerably between these treatment forms.
Objectives: This study compared surface changes associated with exposure of human premolar teeth to topical cycling treatments with three different bleaching systems: Opalescence X-Tra Boost (OPXB), Opalescence 20% PF (OP20PF) and Crest Whitestrips Supreme (CWSS), respectively.
Methods: Extracted human premolars were prepared in Durabase blocks and measured for tooth color, surface microhardness and roughness. Teeth were cycled in a regimen including a pre-test period, test bleaching treatment and 7 days post-bleach period. Bleaching was segmented to 0 h for untreated control group (UC); 42 h for CWSS, 42 h for OP20PF and 45 min with OPXB. Following treatment specimens were re-measured as before.
Results: Bleaching treatments produced significant tooth lightening (yellow reduction). Hardness of enamel specimens from control and bleaching groups were unchanged during cycling: Delta Vickers hardness number (VHN): UC (18+/-11S.D.) a; CWSS (7.0+/-29nsd) a; OP20PF (19+/-15S.D.) a; OPXB (25+/-13S.D.) a (nsd = non-significant difference post-cycle-treat vs. initial Student's t; ANOVA p<0.05 a not equal b between group comparison post-treat). With respect to surface roughness, two-dimensional analysis showed no changes with bleaching: DeltaR(a) (roughness) 2D = UC (0.06+/-0.06nsd) a; CWSS (0.02+/-0.07nsd) a; OP20PF (-0.14+/-0.08nsd) a; OPXB (0.00+/-0.12nsd) a.
Conclusion: Office administered, prescribed and OTC/prescribed bleaching systems were demonstrated as similarly safe to enamel surfaces including maintenance of both hardness and roughness in vitro.
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