Effect of intracanal diode laser irradiation on fracture resistance of roots restored with CAD/CAM posts

Authors

DOI:

https://doi.org/10.20396/bjos.v21i00.8663759

Keywords:

Lasers, Endodontics, Dentistry, Computer-aided design

Abstract

Aim: To evaluate the fracture resistance of roots restored with CAD/CAM-fabricated posts, receiving or not intracanal laser treatment, compared with glass fiber posts under mechanical cycling. Methods: Twenty-seven endodontically treated, single-rooted teeth were divided into 3 groups: group 1 (control), prefabricated glass fiber posts relined with resin composite; group 2, CAD/CAM-fabricated intraradicular posts using Resin Nano Ceramic (RNC) blocks; and group 3, CAD/CAM-fabricated intraradicular posts using RNC blocks in canals irradiated with a 940-nm diode laser (100 mJ, 300-um optic fiber, coronal-apical and apical-coronal helical movements, speed of 2 mm/second, 4 times each canal). After cementation of the coping, cyclic loading was applied at an angle of 135° to the long axis of the root, with a pulse load of 130 N, frequency of 2.2 Hz, and 150,000 pulses on the crown at a point located 2 mm below the incisal edge on the lingual aspect of the specimen. Every 50,000 cycles, the specimens were evaluated for root fracture occurring below or above the simulated bone crest. Results were analyzed by one-way ANOVA followed by Tukey’s test (p<0.05). Results: Group 1 was the least resistant, while groups 2 and 3 were the most resistant. Group 1 differed significantly from groups 2 and 3 (p<0.01), but there was no difference between groups 2 and 3 (p<0.01). Conclusion: Treatment of the intracanal surface with diode laser had no influence on fracture resistance of roots restored with CAD/CAM-fabricated posts, but a longer cycling time is required to evaluate the real benefits of diode laser irradiation.

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Author Biographies

Flavia Florentino Teixeira da Silva, Cruzeiro do Sul University

Graduate Program in Dentistry, Cruzeiro do Sul University, São Paulo, SP, Brazil.

André Hayato Saguchi, Cruzeiro do Sul University

Graduate Program in Dentistry, Cruzeiro do Sul University, São Paulo, SP, Brazil.

Sidnea Aparecida Freitas Paiva, Cruzeiro do Sul University

Graduate Program in Dentistry, Cruzeiro do Sul University, São Paulo, SP, Brazil.

Guilherme Espósito Pires, Cruzeiro do Sul University

Graduate Program in Dentistry, Cruzeiro do Sul University, São Paulo, SP, Brazil.

Mariana Isidoro, Cruzeiro do Sul University

Graduate Program in Dentistry, Cruzeiro do Sul University, São Paulo, SP, Brazil.

Aldo Brugnera Junior, Camilo Castelo Branco University

Camilo Castelo Branco University, São Paulo, SP, Brazil.

Paulo Francisco Cesar, University of São Paulo

Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil.

Ângela Toshie Araki, Cruzeiro do Sul University

Graduate Program in Dentistry, Cruzeiro do Sul University, São Paulo, SP, Brazil.

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Published

2021-12-09

How to Cite

1.
Silva FFT da, Saguchi AH, Paiva SAF, Pires GE, Isidoro M, Brugnera Junior A, Cesar PF, Araki Ângela T. Effect of intracanal diode laser irradiation on fracture resistance of roots restored with CAD/CAM posts. Braz. J. Oral Sci. [Internet]. 2021 Dec. 9 [cited 2022 May 25];21(00):e223759. Available from: https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8663759

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Original Research

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