TODENTJ-25-03-2019_TODENTJ-6-143 1553505374 Bentham Open doi@benthamopen.net Bentham Open The Open Dentistry Journal TODENTJ 1874-2106 9 20 2012 6 1 Roche Hayward Yusuf Osman Sias R Grobler The purpose of this study was to evaluate the efficacy of a Light Emitting Diode (LED) System (BriteWhite) on tooth bleaching. Method: eeth 11 and 21 of twenty one subjects were treated in the chair with a LED light and 44% carbamide peroxide gel, followed by an at-home treatment period of 14 days with 35% carbamide peroxide. The color of the teeth was measured with a spectrophotometer (L*; a*; b*) before treatment (control) and after the above mentioned two stages. The subjects were also instructed to note tooth and gingival sensitivity. Results: For the L* component a statistically significant difference (p<0.05) between base-line and directly after the LED treatment stage (whiter) was found and a complete relapse was found after the 14 day at-home treatment period. The b* component showed statistically significant differences (p<0.05) between base-line and the LED stage (less yellow more blue), with a further significant color improvement after the 14 day treatment period. For the a* component (green to red) no statistically significant change was (p>0.05) found throughout the study (Wilcox on Signed Rank Sum Test). A major color change of 1.8 units (ΔEab) was found after the LED treatment stage with only a further small 0.2 unit improvement after the 14 day at-home treatment stage. Tooth and gingival sensitivity scores were low (below mild) throughout the treatment stages. Conclusion: A major tooth color increase was found after the in-office LED/gel treatment stage and only an insignificant further improvement was noted after the additional 14 day at-home treatment period. Only low tooth and gingival sensitivity scores were found. A slight increase in both the sensitivity and gingival scores after the LED/gel activated stage could be observed. Overall the total color increase was low. 9 20 2012 143 147 TODENTJ-6-143 1 10.2174/crossmark_policy opendentistryjournal.com benthamopen.com true Peer Reviewed Single blind Checked with iThenticate 2012-6-17 2012-6-20 2012-8-20 2012-9-20 http://creativecommons.org/licenses/by-nc/3.0/ 10.2174/1874210601206010143 1553505374 https://opendentistryjournal.com/VOLUME/6/PAGE/143/ https://opendentistryjournal.com/contents/volumes/V6/TODENTJ-6-143/TODENTJ-6-143.pdf https://opendentistryjournal.com/contents/volumes/V6/TODENTJ-6-143/TODENTJ-6-143.pdf https://opendentistryjournal.com/contents/volumes/V6/TODENTJ-6-143/TODENTJ-6-143.pdf https://opendentistryjournal.com/contents/volumes/V6/TODENTJ-6-143/TODENTJ-6-143.pdf https://opendentistryjournal.com/contents/volumes/V6/TODENTJ-6-143/TODENTJ-6-143.pdf https://opendentistryjournal.com/contents/volumes/V6/TODENTJ-6-143/TODENTJ-6-143.pdf https://opendentistryjournal.com/contents/volumes/V6/TODENTJ-6-143/TODENTJ-6-143.pdf https://opendentistryjournal.com/contents/volumes/V6/TODENTJ-6-143/TODENTJ-6-143.xml J Am Dent Assoc Khin PW 131 1478 2000 Khin PW, Barnes DM, Romberg E, Peterson K. 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