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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Strazzi-Sahyon, Henrico Badaoui [1] ; da Silva, Paloma Pereira [2] ; Nakao, Jaqueline Midori [2] ; da Silva, Patricia Zambon [2] ; Nunes, Larissa Pereira [2] ; Seron, Marcelo Augusto [2] ; Angelo Cintra, Luciano Tavares [2] ; dos Santos, Paulo Henrique [1] ; Sivieri-Araujo, Gustavo [2]
Total Authors: 9
Affiliation:
[1] Sao Paulo State Univ UNESP, Aracatuba Sch Dent, Dept Dent Mat & Prosthodont, Aracatuba, SP - Brazil
[2] Sao Paulo State Univ UNESP, Aracatuba Sch Dent, Dept Prevent & Restorat Dent, Discipline Endodont, Rua Jose Bonifacio 1193, BR-16015050 Aracatuba, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Photodiagnosis and Photodynamic Therapy; v. 33, MAR 2021.
Web of Science Citations: 0
Abstract

Background: Although photodynamic therapy associated with photosensitizers can promote microbial reduction, studies evaluating the consequences of two photodynamic therapy sessions associated with different photosen-sitizers 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, con-centration 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 under -went Kruskal-Wallis test, followed by Dunn test for comparison between treatments, and Friedman test for comparison between thirds (alpha = 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. (AU)

FAPESP's process: 16/24718-6 - Bond strength of glass fiber posts to radicular dentin submitted to two sessions of photodynamic therapy
Grantee:Paloma Pereira da Silva
Support Opportunities: Scholarships in Brazil - Scientific Initiation