Evaluation of the Diode laser (810nm,980nm) on dentin tubule diameter following internal bleaching

Abstract

BackgroundThe aim of this study was to evaluate the effect of diode laser irradiation and bleaching materials on the dentinal tubule diameter after laser bleaching.Material and MethodsThe dentin discs of 40 extracted third molar were used in this experiment. Each disc surface was divided into two halves by grooving. Half of samples were laser bleached at different wavelengths with two different concentrations of hydrogen peroxide. Other half of each disc with no laser bleaching remained as a negative control. Dentin discs were assigned randomly into four groups (n=10) with following hydrogen peroxide and diode laser wavelength specifications; Group 1 (30% - 810 nm), group 2 (30% - 980 nm), group 3 (46% - 810 nm) and group 4 (46% - 980 nm). All specimens were sent for scanning electron microscopic (SEM) analysis in order to measure tubular diameter in laser treated and control halves. Data were analyzed by ANOVA and Tukey test (p<0.05).ResultsA significant reduction in dentin tubule diameter was observed in groups 1, 2 and 4. There was no significant difference between groups 1 and 2 and between groups 3 and 4 after bleaching.ConclusionsThe SEM results showed that diode laser was able to reduce dentin tubule diameter and its effect on dentin was dependent on chemical action of bleaching material. Key words:Laser, diode, dentin, tubule, diameter.

Effects of Different 980‐nm Diode Laser Parameters in Hepatectomy

“…The speeds were 1.14 ± 0.14, 1.57 ± 0.30, 1.99 ± 0.26, 2.45 ± 0.35, and 2.63 ± 0.30 mm 2 /s, at 10, 15, 20, 25, and 30 W, respectively. There was a significant difference between the liver resection speeds in the group for different average power settings (10,15,20,25, and 30 W) (P < 0.001). After post hoc test and adjusting the P value of 0.005, all P values were 0.018 (25 vs. 30 W) and <0.001 (the remaining), respectively.…”

“…The diode laser has obvious advantages such as a simple structure, ability to deliver a more stable performance, lower cost, and higher efficiency of electrooptic conversion. Laser has broad applications in the surgical field, especially in prostate resection [4,5], myomectomy [6], lung surgery [7,8], partial nephrectomy [9], and oral soft tissue resection [10].…”

Effect of Three Wavelengths of Diode Laser on the Efficacy of Bleaching of Stained Teeth

“…It is effective, safe, relatively non-invasive, and affordable [ 1 – 3 ]. Since many patients demand to save time and achieve more immediate results, different types of activating sources have been used to accelerate the bleaching process [ 6 , 7 ].…”

“…Thus, laser energy at an 800-nm wavelength is more absorbed by the pigments; by an increase in the wavelength to 980 nm, laser energy is more absorbed by water. Thus, due to different wavelengths, different interactions of the laser with tissues and surface modifications are expected [ 6 ].…”

Evaluation of the Effect of Different Laser Activated Bleaching Methods on Enamel Susceptibility to Caries; An In Vitro Mode

“…Bleaching systems today are based on hydrogen peroxide as the active agent and are often activated by heat or light. 3 Hydrogen peroxide acts as a strong oxidizing agent through the formation of free radicals and reactive molecules which attack dark colored macromolecules and break them into smaller and less colored ones. 4 Although other products such as carbamide peroxide or sodium perborate are available for bleaching, hydrogen peroxide is still considered to be the most effective and popular agent, since it is available in a range of formulations, concentrations and activation modes.…”