Ultrasonic Activation of the Endodontic Sealer Enhances Its Intratubular Penetration and Bond Strength to Irradiated Root Dentin

Overview

Journal Odontology

Specialty Dentistry

Date 2024 Jan 9

PMID 38194041

Authors

Luana Duart Jordani

Amanda Freitas da Rosa

Luiz Carlos de Lima Dias-Junior

Julia Menezes Savaris

Mariana Comparotto Minamisako

Luciano Roberto da Silva

Marcio Toshio Umeda Takashima

Eduardo Antunes Bortoluzzi

Cleonice da Silveira Teixeira

Lucas da Fonseca Roberti Garcia

Affiliations

Soon will be listed here.

Abstract

To evaluate the effect of ultrasonic activation of the endodontic sealer on its intratubular penetration and bond strength to irradiated root dentin. Forty human teeth were distributed into 4 groups (n = 10), according to the radiation therapy (RT) exposure-70 Gy-and ultrasonic activation (UA) of the endodontic sealer: RT/UA-irradiated teeth and sealer UA; RT/no-UA-irradiated teeth and no sealer UA; no-RT/UA-non-irradiated teeth and sealer UA and no-RT/no-UA-non-irradiated teeth and no sealer UA. Push-out bond strength test was performed in a Universal Testing Machine. Failure modes and adhesive interface were analyzed under Scanning Electron Microscopy. The data were statistically compared (two-way-ANOVA and posthoc Games-Howell test; Fisher's exact test - α = 5%). The different experimental conditions (radiation and UA) and the root third had a significant effect on push-out bond strength, and the interaction of these factors was significant (p < 0.05). UA of the sealer significantly increased its bond strength to both irradiated and non-irradiated dentin (p < 0.05). The irradiated groups mostly presented adhesive-type failure of the sealer (p < 0.01). Regardless of the irradiation, the ultrasonically activated groups showed a more homogeneous adhesive interface, with the presence of sealer tags in greater density and depth. Ultrasonic activation enhanced the intratubular penetration and the bond strength of the endodontic sealer to irradiated dentin. The impact of ultrasonic activation of the endodontic sealer on teeth undergoing radiotherapy is a gap in the scientific literature that needs to be bridged.

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