The aim of this study was to evaluate the influence of light energy on the tooth whitening effect of bleaching agent in vitro. Extracted human mandibular molars were sectioned to 2 fragments(mesial, distal) and lingual portions of crown were used in this study. All specimens were stained using a red wine for 24 hours and immersed in artificial saliva. Specimens divided into four groups, group 1 and 2 light-activated by LumaCool (LED, LumaLite, Inc., Spring Valley, USA), group 3 and 4 light-activated by FlipoWhite2 (Plasma acr lamp, Lokki, Australia). Group 1 and 3 bleached with LumaWhite(LumaLite, Inc., Spring Valley, USA), group 2 and 4 bleached with Polaoffice(SDI, Victoria, Australia). Bleaching treatment performed during 10 minutes every 24 hours and repeated 6 times. During bleaching treatment , distal fragments was light-activated(L) but mesial fragments was not(NL). Shade assessment employed before and after bleaching treatment using spectrophotometer. The results of the change in shade was compared and analysed between NL and L by using paired-sample T test with 95% level of confidence.

There were no significant differences between NL and L with a few exceptions. In group 2, a^* value more change in L, in group 3, b^* value more change in L, in group 4, a^* value less change in L. After bleaching, L^* value and ΔE increased in all groups and the value of a^* and b^* decreased in all groups.

Within the limitation of this test conditions, the results of this study indicate that the light energy has no obvious improving impact on the tooth whitening effect of a bleaching agent.

Citations

Citations to this article as recorded by  

• Development of a Piezoelectric Ultrasonic Tooth-whitening Apparatus
  Young-Jin Lee, Jong-Hoo Paik, Jeong-Bae Lee, Seung-Jae Choi
  Transactions on Electrical and Electronic Materials.2013; 14(5): 268.     CrossRef
• Clinical assessment of whitening efficacy and safety of in-office tooth whitening system containing 15% hydrogen peroxide with or without light activation
  Young-Suk Noh, Young-Jee Rho, Yeon-Jee Yoo, Hyang-Ok Lee, Sang-Min Lim, Hyun-Jeong Kweon, Yeun Kim, Seong-Yeon Park, Hee-Young Yoon, Jung-Hyun Lee, Chan-Hee Lee, So-Ram Oh, Kee-Yeon Kum
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When we use the total-etch dentin adhesive system for composite resin restorations, gel or liquid acid etchant such as 37% phosphoric acid is commonly used. Thirty seven percentage phosphoric acid is very powerful erosive agent, and can cause severe harmful effects when it contacts with an oral mucosa and facial skin.

This case describes iatrogenic chemical burn on facial skin caused by phosphoric acid which was happened during composite resin restorative procedure.

Chemical burn by acid etchant can be evoked by careless handling of remnant and syringe. In order to prevent these iatrogenic injuries, we should check the complete removal of the etching agent both in intra and extra-oral environments after etching and rinsing procedure and it is necessary to use of the rubber dam or isolation instruments.

If accidental burn were occurred, immediate wash with copious water. And bring the patient to the dermatologist as soon as possible.

Citations

Citations to this article as recorded by  

• Cytotoxicity of V-Prep Versus Phosphoric Acid Etchant on Oral Gingival Fibroblasts
  Victor Ghoubril, Sylvie Changotade, Didier Lutomski, Joseph Ghoubril, Carole Chakar, Maher Abboud, Louis Hardan, Naji Kharouf, Elie Khoury
  Journal of Functional Biomaterials.2022; 13(4): 266.     CrossRef
• Effects of dental acid etchants in oral epithelial cells
  Do-kyeong Kim, Jae-won Kwak, Ryeong-mi Jo, Da-som Jung, Da-young Youn, Na-yeon Oh, Ji-hye Jang
  Oral Biology Research.2019; 43(4): 299.     CrossRef