title: Effects of Er:YAG and Nd:YAP laser irradiation on the surface roughness and free surface energy of enamel and dentin: an in vitro study.
abstract: Sixty-seven extracted molars were selected (134 samples). Dentin and enamel samples were prepared by buccal and lingual surface sectioning to expose a planar enamel or dentin surface. For the roughness study, 80 samples were randomly assigned to eight groups. Enamel and dentin surfaces were etched with a 37% phosphoric acid solution, irradiated with an Er:YAG laser or irradiated with a Nd:YAP laser. Samples were then observed in SEM using BSE. For the free-surface energy study, 54 samples received the same treatment as above. Two contact angle measurements were made on each surface using a goniometer. Data were analyzed by a non-parametric statistical test. Morphological changes on enamel and dentin were greater with acid-etch and Er:YAG laser than with Nd:YAP laser. Free surface energy was significantly greater with acid-etch or Er:YAG laser than with Nd:YAP laser (p < 0.001).
authors.affiliation: Centre de Recherche sur les Matériaux d'Intérêt Biologique, Département d'Odontologie Conservatrice-Endodontie, France. Valerie.Armengol@sante.univ-nantes.fr
authors.forename: Valerie
authors.initials: V
authors.lastname: Armengol
authors.forename: O
authors.initials: O
authors.lastname: Laboux
authors.forename: P
authors.initials: P
authors.lastname: Weiss
authors.forename: A
authors.initials: A
authors.lastname: Jean
authors.forename: H
authors.initials: H
authors.lastname: Hamel
mesh_terms: D000134:Acid Etching, Dental; D000465:Algorithms; D017607:Aluminum Compounds; D000538:Aluminum Silicates; D017554:Carbon Compounds, Inorganic / Q000737:chemistry; D003743:Dental Enamel / Q000528:radiation effects* / Q000648:ultrastructure; D003804:Dentin / Q000528:radiation effects* / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004871:Erbium; D006801:Humans; D007834:Lasers; D008855:Microscopy, Electron, Scanning; D009354:Neodymium; D010756:Phosphoric Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012542:Scattering, Radiation; D017655:Silicon Compounds / Q000737:chemistry; D013223:Statistics as Topic; D018709:Statistics, Nonparametric; D013500:Surface Tension; D017155:Wettability; D015019:Yttrium
chemical_list: D017607:Aluminum Compounds; D000538:Aluminum Silicates; D017554:Carbon Compounds, Inorganic; D017220:Dentin-Bonding Agents; D010756:Phosphoric Acids; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; D017655:Silicon Compounds; D009354:Neodymium; D015019:Yttrium; D004871:Erbium; C022088:silicon carbide