Effect of the Nd:YAG laser on sealer penetration into root canal surfaces: A confocal microscope analysis |
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Authors: | Paloma Montero-Miralles Raquel Castillo-Oyagüe Isabel Sáez de la Fuente Christopher D Lynch Gabriel Castillo-Dalí Daniel Torres-Lagares |
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Institution: | 1. Faculty of Dentistry, University of Seville (US), C/ Avicena, s/n, 41009 Sevilla, Spain;2. Faculty of Dentistry, Complutense University of Madrid (UCM), Pza. Ramón y Cajal, s/n, 28040 Madrid, Spain;3. School of Dentistry, Cardiff University, CF14 4XY Cardiff, Wales, UK |
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Abstract: | ObjectivesThe objective of this in vitro study was to evaluate the use of the Neodymium:Yttrium-Aluminium-Garnet (Nd:YAG) laser as part of the root canal treatment on the penetration of sealer into dentinal tubules.MethodsEighty extracted lower premolars were randomly assigned to two groups (n = 40 each): Control group (CG), subjected to a conventional protocol of endodontic instrumentation and obturation; and Laser group (LG), in which Nd:YAG laser irradiations were combined with conventional preparation and obturation. Endodonted samples were sectioned at 3 and 5 mm from the apex and observed under a confocal scanning microscope (CLSM). The penetration depth into the dentinal tubules and the extension of the intracanal perimeter infiltrated by sealer were measured. The Student–Newman–Keuls test was run for between-group comparisons (α = .05).ResultsThe depth of sealer penetration into dentinal tubules did not differ among groups. LG samples showed the significantly highest percentage of penetrated perimeter at 3 mm from the root apex. Within each group, the greatest depth of penetration (P = .0001), and the major percentage of penetrated perimeter (P < .001), were recorded at 5 mm.ConclusionsThe application of the Nd:YAG laser after instrumentation did not improve the depth of sealer penetration into the dentinal tubules. The laser enlarged the total penetrable perimeter near the apex.Clinical significanceThe Nd:YAG laser may be an appropriate complement in root canal treatment, as it enhances the sealer adaptation to the dentinal walls in the proximity of the apex. |
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Keywords: | Confocal microscope Nd:YAG laser Endodontic instrumentation Dentinal permeability Endodontic sealer Sealer penetration |
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