Clinical and Spectrophotometric Evaluation of LED and Laser Activated Teeth Bleaching

Abstract

Background:Auxiliary power sources (LED and laser) are used in in-office teeth bleaching techniques to accelerate the redox reaction of the whitening gel to increase ease of use, to improve comfort and safety, and to decrease the procedure time.Objective:The aim this study is to evaluate the efficiency of the teeth whitening procedures performed with hydrogen peroxide and carbamide peroxide, LED or Laser activated.Method:18 patients, affected by exogenous dyschromia, were treated with a bleaching agent composed by 35% hydrogen peroxide and 10% carbamide peroxide. They were divided into two groups: in the first group the bleaching agent was activated by a LED lamp; in the second group it was activated by a Laser diode lamp. Both groups were subjected to 3 bleaching cycle of 15’ each. The chromatic evaluations were performed before and after one week from the treatment, using a chromatic scale and a spectrophotometer. The mean value of pre, post bleaching and follow-up were analyzed using a T-test, with results statistically significant for P<0,05.Results:Results showed that the variations in brightness, chroma and hue are significantly influenced by the interaction between the whitening agent and the original colour of the teeth. Laser-activation has marginally improved the bleaching effectiveness. All patients treated with laser activation complained an increase in dental sensitivity.Conclusion:The use of laser-activating systems did not improve the efficacy of bleaching.

Spectrophotometric Evaluation of Enamel Color Variation Using Infiltration Resin Treatment of White Spot Lesions at One Year Follow-Up

“…To prevent color alteration overtime, Borges et al suggest polishing the treated surface before treatment; a more conservative alternative is to use the walking bleach technique with carbamide peroxide on treated lesions [23,35,36]. Comparing the color difference ∆E (WSLs-SAE) at T0 and T1, the Wilcoxon test pointed out the statistically significant difference (p < 0.01), while for ∆E (WSLs-SAE) at T1 and T2, the color variation was not statistically significant (p = 0.935).…”

“…To prevent color alteration overtime, Borges et al suggest polishing the treated surface before treatment; a more conservative alternative is to use the walking bleach technique with carbamide peroxide on treated lesions [23,35,36].…”

“…The color was measured at 3 random points of the lesion, and the average of the values obtained was calculated [23]. For the SAE the color was measured in 3 points: 1 upper, 1 left, and 1 right to the lesion, at 2 mm from WSLs margin.…”

Rotary Instrument in Non-Surgical Treatment of Chronic Periodontal Disease: Clinic Randomized Study

“…All subjects were enrolled in a hygiene program two weeks prior to the treatment. They received professional supra-gingival tooth cleaning with ultrasonic scalers (supra-gingival ultrasonic tip) and oral hygiene instructions (baseline) [19,20] (Fig. 1).…”

Cytotoxic Effects of Zoom® Whitening Product in Human Fibroblasts

“…Hydrogen peroxide is a strongly oxidizing agent of organic and inorganic compounds through the formation of free radicals, such as reactive oxygen species (ROS), which include the superoxide anion, the hydroxyl radical, singlet oxygen, and hydrogen peroxide itself [1,5]. ROS are highly unstable and promote a redox reaction in the tooth structure, decomposing the long pigment chains into smaller, less pigmented, more diffuse and in some cases water-soluble molecules, whitening the tooth [5,6]. ROS formation from hydrogen peroxide can be improved by light systems, quickening the treatment [7,8].…”