Adaptation and penetration of resin-based root canal sealers in root canals irradiated with high-intensity lasers.

Renato Miotto Palo,Igor Prokopowitsch,Cacio Moura-Netto,Marcia Martins Marques,Cornelis H Pameijer,Anna Carolina Volpi Mello-Moura

doi:10.1117/1.jbo.20.3.038002

Abstract

This research analyzed the quality of resin-based sealer adaptation after intracanal laser irradiation. Extracted teeth (n = 168) were root canal treated and divided into four groups, according to dentin surface treatment: no laser; Nd:YAG laser (1.5 W, 100 mJ, 15 Hz); diode laser (2.5 W in CW), and Er:YAG laser (1 W, 100 mJ, 10 Hz). The teeth were divided into four subgroups according to the sealer used: AH Plus, EndoREZ, Epiphany, and EpiphanySE. For testing the sealing after root canal obturation, the penetration of silver nitrate solution was measured, whereas to evaluate the adaptation and penetration of the sealer into the dentin, environmental scanning electron microscopy (ESEM) was used. The ESEM images were analyzed using a four-grade criteria score by three evaluators. The inter-examiner agreement was confirmed by Kappa test and the scores statistically compared by the Kruskal-Wallis' test (p < 0.05). Both adaptation and sealer penetration in root canals were not affected by the laser irradiation. Nd:YAG and diode laser decreased the tracer penetration for AH Plus, whereas EndoREZ and EpiphanySE performances were affected by Nd:YAG irradiation (p < 0.05). It can be concluded that intracanal laser irradiation can be used as an adjunct in endodontic treatment; however, the use of hydrophilic resin sealers should be avoided when root canals were irradiated with Nd:YAG laser.

Highlights

Complete seal of canal systems is considered paramount to achieve the successful outcomes in root canal treatment
As an adjunct in endodontic treatment, the use of high intensity laser devices has demonstrated significant intracanal disinfection and morphological changes of the dentin surface that interfere with dentin permeability and root canal sealing.[5,6,8,9,10,11,12,13,14,15,16]
In group erbium [Fig. 1(d)], the dentin surface appeared clean with some localized fusion of dentin and mostly opened dentinal tubules that demonstrated ablated intertubular dentin

Summary

Introduction

Complete seal of canal systems is considered paramount to achieve the successful outcomes in root canal treatment. Studies using methacrylate resin-based sealers have shown promising results when compared with conventional sealers. They possess hydrophilic characteristics that improve the penetration of the sealer into dentinal tubules, improving the sealing capacity.[2,3,4,5,6,7]. As an adjunct in endodontic treatment, the use of high intensity laser devices has demonstrated significant intracanal disinfection and morphological changes of the dentin surface that interfere with dentin permeability and root canal sealing.[5,6,8,9,10,11,12,13,14,15,16] The interaction between laser wavelengths and irradiated tissues will assume the level of energy absorbed by the latter and the intensity of tissue alteration.3,9,11–,15–18. As an adjunct in endodontic treatment, the use of high intensity laser devices has demonstrated significant intracanal disinfection and morphological changes of the dentin surface that interfere with dentin permeability and root canal sealing.[5,6,8,9,10,11,12,13,14,15,16] The interaction between laser wavelengths and irradiated tissues will assume the level of energy absorbed by the latter and the intensity of tissue alteration.3,9,11–,15–18 Wavelengths between 800 and 1100 nm (i.e., diode and Nd:YAG lasers) have poor interaction with dental hard tissues like enamel

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