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Received : 17 April, 2014 Revised : 21 July, 2014 Accepted : 11 August, 2014 ABSTRACT Objectives : The purpose of this study was to investigate of the color change, tooth surface and intra-pulpal temperature of tooth bleaching by light activation Methods : Forty-eight extracted bovine teeth were immersed into a tea solution for 24 hours. The specimens were randomly divided into four groups(n=15):(G1) 15% HP + without light activation, (G2) 15% HP + light activation, (G3) 25% HP + without light activation, (G4) 25% HP + light activation. All specimens were bleached for 15 minutes three times. The spectrophotometer (CM-2600d, Konica Minolta, Osaka, Japan) was used including before bleaching, immediately after bleaching, 1 week, 1 and 3 months after the end of bleaching. The temperature rise were measured in the pulpal chamber and tooth surface with a digital thermocouple thermometer(Termopar Digital Multimeter, Tektronix DMM916, USA). Between the tested time points, the specimens were stored in distilled water. The data were analyzed by ANOVA, t-test and Tukey’s post hoc test set at 0.05. Corresponding Author Youn-Soo Shim Department of Dental Hygiene Sunmoon University 70 Sunmoon-ro, Tangjeong-myeon Asan-si, Chungnam 336-708, Korea. Tel : +82-41-530-2740 +82-10-3404-2171 Fax : +82-41-530-2726 E-mail : shim-21@hanmail.net Results : There was no significant color change by the use of light after the bleaching treatment(p>0.05). The dental bleaching treatments of teeth with 15% HP and 25% HP did not seem to be more effective when light source was used. There was no difference in color stability between groups within three month(p>0.05). There was an increase in tooth surface and pulp temperature, but it was not sufficient to cause damage to the pulp. Conclusions :The use of light activation has no obvious effective impact on the tooth bleaching effect.

Tooth bleaching effect by light activation on the tooth surface and intra-pulpal temperature: an in vitro study