Influence of two photodynamic therapy sessions and different photosensitizers on the bond strength of glass-fiber posts in different regions of intraradicular dentin

Autor: Jaqueline Midori Nakao, Paulo Henrique dos Santos, Paloma Pereira da Silva, Patrícia Zambon da Silva, Henrico Badaoui Strazzi-Sahyon, Gustavo Sivieri-Araujo, Luciano Tavares Angelo Cintra, Larissa Pereira Nunes, Marcelo Augusto Seron
Přispěvatelé: Universidade Estadual Paulista (Unesp)
Rok vydání: 2021
Předmět:
Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
ISSN: 1572-1000
DOI: 10.1016/j.pdpdt.2021.102193
Popis: Made available in DSpace on 2021-06-25T10:50:26Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-03-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Background: Although photodynamic therapy associated with photosensitizers can promote microbial reduction, studies evaluating the consequences of two photodynamic therapy sessions associated with different photosensitizers on the bond strength of glass-fiber posts to endodontically treated intraradicular dentin are scarce. This in vitro study aimed to investigate the influence of two photodynamic therapy sessions using methylene blue or curcumin photosensitizers on the bond strength of glass-fiber posts to intraradicular dentin in different root thirds. Methods: Seventy-two teeth were divided into 9 experimental groups according to photosensitizer type, concentration and light-activation: Control - deionized water; Methylene blue 50 mg/L; Methylene blue 50 mg/L + laser; Methylene blue 100 mg/L; Methylene blue 100 mg/L + laser; Curcumin 500 mg/L; Curcumin 500 mg/L + LED; Curcumin 1000 mg/L; and Curcumin 1000 mg/L + LED. Push-out bond strength of the fiber posts to endodontically treated dentin was evaluated using a universal test machine (n = 8). Bond strength data underwent Kruskal-Wallis test, followed by Dunn test for comparison between treatments, and Friedman test for comparison between thirds (α = 0.05). Illustrative scanning electron microscopy images were obtained to qualify the failure mode. Results: Curcumin at higher concentration, activated or not by blue LED, decreased the bond strength values in the apical region when compared with the control group (P < 0.05). There was no difference between two photodynamic therapy sessions using methylene blue photosensitizer (activated or not) and the control group regardless of concentrations and root canal depth evaluated (P > 0.05). Regarding intraradicular depth, the different thirds showed no statistical difference on bond strength values (P > 0.05). All experimental groups presented predominance of mixed-type failure, excepting the methylene blue group at higher concentration activated by red laser, and the curcumin photosensitizer at both concentrations activated by blue LED. Conclusions: Methylene blue at a 50 mg/L concentration can be applied in two PDT sessions, after biomechanical preparation and before glass-fiber post luting, as it presents no influence on root dentin bond strength in in vitro conditions. Department of Dental Materials and Prosthodontics Araçatuba School of Dentistry São Paulo State University - UNESP Department of Preventive and 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 Preventive and Restorative Dentistry Discipline of Endodontics Araçatuba School of Dentistry São Paulo State University - UNESP FAPESP: #2016/24718-6
Databáze: OpenAIRE
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