Effectiveness of ultrasonic activation over glycolic acid on microhardness, cohesive strength, flexural strength, and fracture resistance of the root dentin.

Autor: Souza MA; School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil. matheus292@yahoo.com.br., Ricci R; School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil., Bischoff KF; School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil., Reuter E; School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil., Ferreira ER; School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil., Dallepiane FG; School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil., Quevedo LM; School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil., Pereira LHB; School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil., Bischoff LF; School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil., Hofstetter MG; School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil., Brammer MP; School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil., Bernardes NM; School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil., Bervian J; School of Dentistry, University of Passo Fundo, Passo Fundo, RS, Brazil.
Jazyk: angličtina
Zdroj: Clinical oral investigations [Clin Oral Investig] 2023 Apr; Vol. 27 (4), pp. 1659-1664. Date of Electronic Publication: 2022 Nov 21.
DOI: 10.1007/s00784-022-04792-4
Abstrakt: Objectives: The aim of this study was to evaluate the effectiveness of ultrasonic activation (US) over glycolic acid on microhardness, cohesive strength, flexural strength, and fracture resistance of root dentin, comparing with conventional final irrigation protocols.
Methods: Samples were obtained from 140 extracted bovine teeth and distributed into four test groups: microhardness (50 teeth), cohesive strength (15 teeth), flexural strength (15 teeth), and fracture resistance (60 teeth). In all four tests, specimens were subdivided into five groups, according to final irrigation protocols: G1: distilled water (DW); G2: 17% ethylenediaminetetraacetic acid (EDTA); G3: 17% glycolic acid (GA); G4: 17% EDTA + US; and G5: 17% GA + US. The duration time of each protocol was set in 1 min. After irrigation protocols, the Vickers tester was used to evaluate microhardness and the universal testing machine was used to evaluate the cohesive strength, flexural strength, and fracture resistance of the root dentin. One-way ANOVA test and the Tukey HSD were used for multiple comparison tests in all evaluations (α = 5%).
Results: In general, groups 2 (EDTA), 4 (EDTA + US), and 5 (GA + US) promoted the highest reduction of microhardness, being statistically different from other groups (p < 0.05). Cohesive strength, flexural strength, and fracture resistance data revealed that no differences between groups were observed (p > 0.05).
Conclusions: The association of GA and US results in microhardness reduction, with no influence on cohesive strength, flexural strength, and fracture resistance of the root dentin.
Clinical Relevance: The use of US over GA has no influence on some mechanical properties of root dentin.
(© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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