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KMID : 1020220140140040585
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Journal of Korean Society of Dental Hygiene
2014 Volume.14 No. 4 p.585 ~ p.591
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Tooth bleaching effect by light activation on the tooth surface and intra-pulpal temperature: an in vitro study
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Shim Youn-Soo
Woo Hee-Sun
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Abstract
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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.
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.
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KEYWORD
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intra-pulpal temperatures, light activation, tooth bleaching
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