Influence of Er,Cr:YSGG laser irradiation on enamel caries prevention. 2013

Vinicius Rangel Geraldo-Martins, and Cesar Penazzo Lepri, and Regina Guenka Palma-Dibb
Ribeirao Preto School of Dentistry, São Paulo University, Avenida do Café S/N - 14040-904, Ribeirao Preto, SP, Brazil. vinigmartins@yahoo.com.br

The objective of this study was to evaluate the effects of chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser irradiation on the acid resistance of dental enamel. Forty human enamel samples were divided into four groups. They were manually irradiated with an Er,Cr:YSGG laser device (λ = 2.78 µm, 20 Hz, 20 s), in a scanning mode, with and without water cooling, according to the following parameters: Group 1: 0.25 W, 62.5 J/cm(2), no water cooling; group 2: 0.25 W, 62.5 J/cm(2), 5.0 ml/min; group 3: 0.5 W, 125 J/cm(2), no water cooling; group 4: 0.5 W, 125 J/cm(2), 5.0 ml/min. No airflow was used. Afterwards, the samples were submitted to an acid challenge and assessed by cross-sectional Knoop microhardness at different depths (20, 40, 60, 80, and 100 µm) from the outer enamel surface. Average values were obtained for both irradiated and control areas in each sample and they were compared to obtain a percentage of microhardness increase. Data were analyzed by analysis of variance and Fisher's exact test (α = 5%). The percentage of microhardness increase observed in group 1 (+23.58%) was similar to group 3 (+19.12%), but higher than groups 2 (+3.61%) and 4 (10.9%) (p < 0.05). The comparison of the depths showed that the Er,Cr:YSGG laser acted in the superficial layers of the dental enamel. The findings of the present study suggest that the energy densities of 62.5 and 125 J/cm(2) were capable of increasing the acid resistance of human enamel. The presence of water during irradiation makes it difficult to obtain an enamel surface more resistant to acids.

UI MeSH Term Description Entries
D003731 Dental Caries Localized destruction of the tooth surface initiated by decalcification of the enamel followed by enzymatic lysis of organic structures and leading to cavity formation. If left unchecked, the cavity may penetrate the enamel and dentin and reach the pulp. Caries, Dental,Carious Lesions,Dental Cavities,Dental Cavity,Dental Decay,Dental White Spots,Carious Dentin,Decay, Dental,Dental White Spot,White Spot, Dental,White Spots, Dental,Carious Dentins,Carious Lesion,Cavities, Dental,Cavity, Dental,Dentin, Carious,Dentins, Carious,Lesion, Carious,Lesions, Carious,Spot, Dental White,Spots, Dental White
D003743 Dental Enamel A hard thin translucent layer of calcified substance which envelops and protects the dentin of the crown of the tooth. It is the hardest substance in the body and is almost entirely composed of calcium salts. Under the microscope, it is composed of thin rods (enamel prisms) held together by cementing substance, and surrounded by an enamel sheath. (From Jablonski, Dictionary of Dentistry, 1992, p286) Enamel,Enamel Cuticle,Dental Enamels,Enamel, Dental,Enamels, Dental,Cuticle, Enamel,Cuticles, Enamel,Enamel Cuticles,Enamels
D006245 Hardness Tests A test to determine the relative HARDNESS of a metal, mineral, or other material according to one of several scales, such as Brinell, Mohs, Rockwell, Vickers, or Shore. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed). Hardness Test,Test, Hardness,Tests, Hardness
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D006863 Hydrogen-Ion Concentration The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH pH,Concentration, Hydrogen-Ion,Concentrations, Hydrogen-Ion,Hydrogen Ion Concentration,Hydrogen-Ion Concentrations
D000704 Analysis of Variance A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable. ANOVA,Analysis, Variance,Variance Analysis,Analyses, Variance,Variance Analyses
D013499 Surface Properties Characteristics or attributes of the outer boundaries of objects, including molecules. Properties, Surface,Property, Surface,Surface Property
D053844 Lasers, Solid-State Lasers which use a solid, as opposed to a liquid or gas, as the lasing medium. Common materials used are crystals, such as YAG (YTTRIUM aluminum garnet); alexandrite; and CORUNDUM, doped with a rare earth element such as a NEODYMIUM; ERBIUM; or HOLMIUM. The output is sometimes additionally modified by addition of non-linear optical materials such as potassium titanyl phosphate crystal, which for example is used with neodymium YAG lasers to convert the output light to the visible range. Alexandrite Laser,Alexandrite Lasers,Diode Pumped Solid State Laser,Diode Pumped Solid State Lasers,Er-YAG Laser,Er-YAG Lasers,Erbium Doped Yttrium Aluminum Garnet Laser,Erbium YAG Laser,Erbium-Doped Yttrium Aluminum Garnet Laser,Erbium-Doped Yttrium Aluminum Garnet Lasers,Ho YAG Laser,Ho YAG Lasers,Holmium Doped Yttrium Aluminum Garnet Lasers,Holmium Laser,Holmium-YAG Laser,Holmium-YAG Lasers,KTP Laser,Laser, Nd-YAG,Nd-YAG Laser,Nd-YAG Lasers,Neodymium-Doped Yttrium Aluminum Garnet Laser,Neodymium-Doped Yttrium Aluminum Garnet Lasers,Potassium Titanyl Phosphate Laser,Ruby Laser,Ruby Lasers,Solid-State Laser,YAG Laser,YAG Lasers,YLF Laser,YLF Lasers,YSGG Laser,YSGG Lasers,Yttrium Aluminum Garnet Laser,Yttrium-Lithium-Fluoride Laser,Yttrium-Lithium-Fluoride Lasers,Yttrium-Scandium-Gallium Garnet Laser,Yttrium-Scandium-Gallium Garnet Lasers,Erbium YAG Lasers,Holmium Lasers,KTP Lasers,Lasers, Alexandrite,Lasers, Diode Pumped Solid State,Lasers, Er-YAG,Lasers, Erbium-Doped Yttrium Aluminum Garnet,Lasers, Ho-YAG,Lasers, Holmium Doped Yttrium Aluminum Garnet,Lasers, Nd-YAG,Lasers, Neodymium-Doped Yttrium Aluminum Garnet,Lasers, Ruby,Lasers, YAG,Lasers, Yttrium Aluminum Garnet,Lasers, Yttrium-Lithium-Fluoride,Potassium Titanyl Phosphate Lasers,Yttrium Aluminum Garnet Lasers,Er YAG Laser,Er YAG Lasers,Erbium Doped Yttrium Aluminum Garnet Lasers,Ho-YAG Laser,Ho-YAG Lasers,Holmium YAG Laser,Holmium YAG Lasers,Laser, Alexandrite,Laser, Er-YAG,Laser, Erbium YAG,Laser, Ho YAG,Laser, Ho-YAG,Laser, Holmium,Laser, Holmium-YAG,Laser, KTP,Laser, Nd YAG,Laser, Ruby,Laser, Solid-State,Laser, YAG,Laser, YLF,Laser, YSGG,Laser, Yttrium-Lithium-Fluoride,Laser, Yttrium-Scandium-Gallium Garnet,Lasers, Er YAG,Lasers, Erbium Doped Yttrium Aluminum Garnet,Lasers, Erbium YAG,Lasers, Ho YAG,Lasers, Holmium,Lasers, Holmium-YAG,Lasers, KTP,Lasers, Nd YAG,Lasers, Neodymium Doped Yttrium Aluminum Garnet,Lasers, Solid State,Lasers, YLF,Lasers, YSGG,Lasers, Yttrium Lithium Fluoride,Lasers, Yttrium-Scandium-Gallium Garnet,Nd YAG Laser,Nd YAG Lasers,Neodymium Doped Yttrium Aluminum Garnet Laser,Neodymium Doped Yttrium Aluminum Garnet Lasers,Solid State Laser,Solid-State Lasers,YAG Laser, Erbium,YAG Laser, Ho,YAG Lasers, Erbium,YAG Lasers, Ho,Yttrium Lithium Fluoride Laser,Yttrium Lithium Fluoride Lasers,Yttrium Scandium Gallium Garnet Laser,Yttrium Scandium Gallium Garnet Lasers
D066298 In Vitro Techniques Methods to study reactions or processes taking place in an artificial environment outside the living organism. In Vitro Test,In Vitro Testing,In Vitro Tests,In Vitro as Topic,In Vitro,In Vitro Technique,In Vitro Testings,Technique, In Vitro,Techniques, In Vitro,Test, In Vitro,Testing, In Vitro,Testings, In Vitro,Tests, In Vitro,Vitro Testing, In

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