In Situ Analysis of CO2 Laser Irradiation on Controlling Progression of Erosive Lesions on Dental Enamel

Author(s)

Lepri, Taisa Penazzo ^[1] ; Scatolin, Renata Siqueira ^[1] ; Colucci, Vivian ^[1] ; De Alexandria, Adilis Kalina ^[2] ; Maia, Lucianne Cople ^[2] ; Turssi, Cecilia Pedroso ^{[3, 4]} ; Milori Corona, Silmara Aparecida ^[1]

Affiliation

^[1] Univ Sao Paulo, Sch Dent Ribeirao Preto, Dept Restorat Dent, BR-14040904 Ribeirao Preto, SP - Brazil

^[2] Fed Univ Rio de Janeiro UFRJ, Sch Dent, Dept Pediat & Orthodont, BR-21941913 Rio De Janeiro, RJ - Brazil

^[3] Sao Leopoldo Mand Inst, Dept Restorat Dent, BR-13045755 Campinas, SP - Brazil

^[4] Dent Res Ctr, BR-13045755 Campinas, SP - Brazil

• Document type: Journal article
• Source: MICROSCOPY RESEARCH AND TECHNIQUE; v. 77, n. 8, p. 586-593, AUG 2014.
• Web of Science Citations: 1

Abstract

The present study aimed to evaluate in situ the effect of CO2 laser irradiation to control the progression of enamel erosive lesions. Fifty-six slabs of bovine incisors enamel (5 x 3 x 2.5 mm(3)) were divided in four distinct areas: (1) sound (reference area), (2) initial erosion, (3) treatment (irradiated or nonirradiated with CO2 laser), (4) final erosion (after in situ phase). The initial erosive challenge was performed with 1% citric acid (pH = 2.3), for 5 min, 2x/day, for 2 days. The slabs were divided in two groups according to surface treatment: irradiated with CO2 laser (lambda = 10.6 mu m; 0.5 W) and nonirradiate. After a 2-day lead-in period, 14 volunteers wore an intraoral palatal appliance containing two slabs (irradiated and nonirradiated), in two intraoral phases of 5 days each. Following a cross-over design during the first intraoral phase, half of the volunteers immersed the appliance in 100 mL of citric acid for 5 min, 3x/day, while other half of the volunteers used deionized water (control). The volunteers were crossed over in the second phase. Enamel wear was determined by an optical 3D profilometer. Three-way ANOVA for repeated measures revealed that there was no significant interaction between erosive challenge and CO2 laser irradiation (P = 0.419). Erosive challenge significantly increased enamel wear (P = 0.001), regardless whether or not CO2 laser irradiation was performed. There was no difference in enamel wear between specimens CO2-laser irradiated and non-irradiated (P = 0.513). Under intraoral conditions, CO2 laser irradiation did not control the progression of erosive lesions in enamel caused by citric acid. (C) 2014 Wiley Periodicals, Inc. (AU)

• FAPESP's process: 10/19247-8 - In situ analysis of CO2 laser effect on controlling the progression of lesions of erosion and abrasion on dental enamel
• Grantee: Taisa Penazzo Lepri
• Support type: Scholarships in Brazil - Doctorate