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Bond strength of epoxy resin-based root canal sealer to human root dentin irradiated with Er,Cr:YSGG laser. 2016

Keila de Almeida Franceschini, and Yara Teresinha Corrêa Silva-Sousa, and Fabiane Carneiro Lopes, and Rodrigo Dantas Pereira, and Regina Guenka Palma-Dibb, and Manoel Damião de Sousa-Neto
Department of Restorative Dentistry, Shcool of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.

The aim was to evaluate the influence of Er,Cr:YSGG laser irradiation associated with different final irrigation protocols on the bond strength of epoxy resin-based root canal sealer to root dentin, on the dentin/filling material interface and in the temperature variation during irradiation. Ninety-six maxillary canines were prepared with K3 rotary system up to #45/0.02 instrument, irrigating with distilled water between files. The specimens were randomly assigned to three groups-final irrigation (distilled water, 1% NaOCl, and 17% EDTAC) and four subgroups (n = 8)-laser parameters (non-irradiated, 2 W/20 Hz, 3 W/20 Hz, and 4 W/20 Hz). During irradiation, the temperatures were measured on the outer root dentin wall in the three thirds, and root apex. Canals were filled with lateral condensation of AHPlus sealer and gutta-percha cones. Two slices from each third were submitted to a push-out test in Instron machine and the failure mode was analyzed. One slice from each third was analyzed by confocal laser microscopy to evaluate the percentage of the perimeter of the root canal cross-section with sealer tags and depth of tags. Data were analyzed by ANOVA, Kruskal-Wallis, and Tukey's tests (P < 0.05). Er,Cr:YSGG laser irradiation increased sealer bond strength to dentin, regardless of the final irrigation. The highest values were obtained for 3 W (4.02 ± 1.32) and 4 W (4.18 ± 0.98) powers and different from the non-irradiated group (2.64 ± 0.58) (P < 0.05). The 2 W irradiation produced similar results to 3 W and 4 W when associated with 17% EDTA. Final irrigation with 17% EDTAC provided higher bond strength (4.01 ± 1.02) compared with distilled water (3.11 ± 1.09) and 1% NaOCl (3.47 ± 1.18) (P < 0.05). The cervical third (4.01 ± 1.21) presented significantly higher bond strength than the apical third (3.04 ± 0.89). There was a greater percentage of adhesive and mixed failure. In the groups irradiated with 3 W [21.1 (14.1-27.7)] and 4 W [17.8 (11.9-23.7)], a greater depth of filling material tags was observed compared with the non-irradiated group [12.9 (9.0-20.0)]. The greatest percentage of canal perimeter with sealer tags was observed in the irradiated groups, with no difference among them (P > 0.05). The temperature rise was proportional to the increase of laser power. Er,Cr:YSGG laser irradiation increased the bond strength of an epoxy resin-based sealer to root dentin, with greater formation of sealer tags for all tested powers, especially when combined with 17% EDTAC final irrigation; temperature rise during irradiation remained below the critical threshold biologically accepted. Lasers Surg. Med. 48:985-994, 2016. © 2016 Wiley Periodicals, Inc.

UI MeSH Term Description Entries
D011897 Random Allocation A process involving chance used in therapeutic trials or other research endeavor for allocating experimental subjects, human or animal, between treatment and control groups, or among treatment groups. It may also apply to experiments on inanimate objects. Randomization,Allocation, Random
D001840 Dental Bonding An adhesion procedure for orthodontic attachments, such as plastic DENTAL CROWNS. This process usually includes the application of an adhesive material (DENTAL CEMENTS) and letting it harden in-place by light or chemical curing. Bonding, Dental,Cure of Orthodontic Adhesives,Curing, Dental Cement,Dental Cement Curing,Orthodontic Adhesives Cure
D003804 Dentin The hard portion of the tooth surrounding the pulp, covered by enamel on the crown and cementum on the root, which is harder and denser than bone but softer than enamel, and is thus readily abraded when left unprotected. (From Jablonski, Dictionary of Dentistry, 1992) Dentine,Dentines,Dentins
D004853 Epoxy Resins Polymeric resins derived from OXIRANES and characterized by strength and thermosetting properties. Epoxy resins are often used as dental materials. Epoxy Resin,Resin, Epoxy,Resins, Epoxy
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012387 Root Canal Filling Materials Materials placed inside a root canal for the purpose of obturating or sealing it. The materials may be gutta-percha, silver cones, paste mixtures, or other substances. (Dorland, 28th ed, p631 & Boucher's Clinical Dental Terminology, 4th ed, p187) Root Canal Filling Material,Root Canal Sealants,Sealants, Root Canal,Canal Sealant, Root,Canal Sealants, Root,Root Canal Sealant,Sealant, Root Canal
D013696 Temperature The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms. Temperatures
D016474 Weight-Bearing The physical state of supporting an applied load. This often refers to the weight-bearing bones or joints that support the body's weight, especially those in the spine, hip, knee, and foot. Load-Bearing,Axial Loading,Loadbearing,Weightbearing,Axial Loadings,Load Bearing,Weight Bearing
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
D018613 Microscopy, Confocal A light microscopic technique in which only a small spot is illuminated and observed at a time. An image is constructed through point-by-point scanning of the field in this manner. Light sources may be conventional or laser, and fluorescence or transmitted observations are possible. Confocal Microscopy,Confocal Microscopy, Scanning Laser,Laser Microscopy,Laser Scanning Confocal Microscopy,Laser Scanning Microscopy,Microscopy, Confocal, Laser Scanning,Confocal Laser Scanning Microscopy,Confocal Microscopies,Laser Microscopies,Laser Scanning Microscopies,Microscopies, Confocal,Microscopies, Laser,Microscopies, Laser Scanning,Microscopy, Laser,Microscopy, Laser Scanning,Scanning Microscopies, Laser,Scanning Microscopy, Laser

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