Author(s):
Strazzi-Sahyon, Henrico Badaoui [UNESP] ; de Oliveira, Murilo Silva [UNESP] ; da Silva, Paloma Pereira [UNESP] ; Banci, Henrique Augusto [UNESP] ; de Melo, Fernanda Santos [UNESP] ; Martinez, Carolina Martins Teixeira [UNESP] ; Cintra, Luciano Tavares Angelo [UNESP] ; Gomes-Filho, João Eduardo [UNESP] ; Dezan-Júnior, Eloi [UNESP] ; dos Santos, Paulo Henrique [UNESP] ; Sivieri-Araujo, Gustavo [UNESP]
Date: 2020
Persistent ID: http://hdl.handle.net/11449/200034
Origin: Oasisbr
Subject(s): Dentin; Elastic modulus; Hardness; Methylene blue; Photodynamic therapy; Push Out; Dentin; Dentin; Elastic modulus; Elastic modulus; Hardness; Hardness; Methylene blue; Methylene blue; Photodynamic therapy; Photodynamic therapy; Push Out; Push Out
Description
Made available in DSpace on 2020-12-12T01:55:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-06-01
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Background: There are few studies on the influence of methylene blue as a photosensitiser on the mechanical properties and adhesion of glass-fiber posts to intraradicular dentin. Thus, this in vitro study aimed to evaluate the influence of photodynamic therapy with a methylene blue photosensitizer on the Martens hardness, elastic modulus, and bond strength of glass-fiber posts in different thirds of intraradicular dentin. Methods: Eighty bovine teeth were divided into the following five groups: a control using deionized water, and four other groups according to the methylene blue concentration (50 mg/L or 100 mg/L) and substrate treatment (with or without red laser action). Ultramicrohardness test was used to evaluate the mechanical properties in different regions of the root dentin (n = 8). Push-out analysis was evaluated using a universal testing machine (n = 8). Data were subjected to the Kruskal–Wallis test, followed by Dunn's test for comparing groups, and the Friedman test for comparing thirds (α = 0.05). Representative scanning electron microscopy images were obtained. Results: In general, methylene blue in distinct concentrations, with or without laser action, did not cause differences in the mechanical properties or bond strength in different regions of root dentin (P > 0.05). Methylene blue at a higher concentration, activated with laser, produced lower bond strength values in the middle third of the root canal (P < 0.05). Conclusions: Methylene blue at 50 mg/L had no influence on the mechanical properties of the bovine tooth and the bond strength of the glass-fiber posts to intraradicular dentin.
Department of Dental Materials and Prosthodontics Araçatuba School of Dentistry São Paulo State University – UNESP
Department of Restorative Dentistry Discipline of Endodontics Araçatuba School of Dentistry São Paulo State University – UNESP
Department of Dental Materials and Prosthodontics Araçatuba School of Dentistry São Paulo State University – UNESP
Department of Restorative Dentistry Discipline of Endodontics Araçatuba School of Dentistry São Paulo State University – UNESP
FAPESP: #2015/06056-3
