The effect of strip, tray and office peroxide bleaching systems on enamel surfaces in vitro.

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