Caries inhibition around composite restorations by pulsed carbon dioxide laser application

Abstract

This in vitro study aimed to evaluate whether laser irradiation of cavity margins reduces enamel demineralization around composite restoration. Enamel cavities were prepared in 33 human enamel slabs, which were randomly divided into three groups. One group was kept as a control, and the cavosurface margin of the cavities of the other groups were irradiated, using a CO(2) laser (lambda = 10.6 microm), at 8 J.cm(-2) or 16 J.cm(-2). The cavities were restored with a resin-based composite, according to the manufacturer's specifications. Before restoration, scanning electron microscopy was performed on one specimen of each group. The remaining slabs were submitted to thermal and pH-cycling models. Enamel mineral loss, at 50 and 100 microm from the restoration margin, was assessed by cross-sectional microhardness analyses. Fusion and melting were observed in the irradiated groups. Mineral loss at 50 microm from the restoration margin was significantly inhibited in the irradiated groups compared to the control group, but at 100 microm from the restoration margin, mineral loss at only the highest laser energy density differed statistically from the control group. The difference between the irradiated groups was not statistically significant at either 50 or 100 microm from the restoration margin. In conclusion, irradiation of the cavosurface margin of cavities, using a pulsed CO(2) laser, is able to inhibit enamel demineralization around composite restorations, and an energy density of 16 J.cm(-2) is efficient, even at 100 microm from the cavity margin.

Etching Enamel for Orthodontics with an Erbium, Chromium:Yttrium-Scandium-Gallium-Garnet Laser System

“…Hossain et al 12 reported an increase in the calcium to phosphorus ratio achieved during laser irradiation, which leads to caries inhibition. 16,17 Therefore, laser irradiation might have an advantage as an etchant for orthodontic bonding. In previous studies [7][8][9] , cutting of enamel and dentine with laser systems was established.…”

Mi̇neye Farkli Yüzey Pürüzlendi̇rme Metotlariyla Yapiştirilmiş Braketleri̇n Makaslama Ağlanma Dayanimlari

“…27 Bu çürük koruyucu etki Ca:P oranındaki değiĢiklikler, karbonatın azalması ve pirofosfat oluĢumu ile iliĢkilendirilmiĢtir. 39 Asit ile pürüzlendirme sırasında diĢin tükürükten çok iyi izole edilmesi gerekirken, lazer ile pürüzlendirme su soğut-ması ile yapıldığından tükürük izolasyonu gerekmemektedir. Bu da tükürük izolasyonunun zor sağlandığı klinik durumlarda (çocuk hasta, posterior bölge diĢleri) teknik hassasiyetin az olması nedeni ile avantaj sağ-lamaktadır.…”

Structural Changes on Human Dental Enamel Treated with Er:YAG, CO2 Lasers and Remineralizing Solution: EDS Analysis

“…Since then, several studies on caries prevention have been published due to the development of several types of lasers, such as CO 2 , (Stern & Sognnaes, 1972;Featherstone, et al, 1998;Hsu, et al, 2000;Tisai, et al, 2002;Kato, et al, 2003;Klein, et al, 2005;Steiner-Oliveira, et al, 2006), argon (Westerman, et al, 2002;Nammour, et al, 2005), Nd:YAG (Bahar & Tagomori, 1994;Hossain, et al, 2001a), and Diodo (Kato, et al, 2006) and more recently with the group of erbium lasers: Er, Cr:YSGG and Er:YAG (Kayano, et al, 1989;Fried, et al, 1996;Hossain, et al, 2001b;Apel, et al, 2004). There are various theories to explain the reduced acid solubility of dental enamel after heating.…”