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13.04.2019 | Original Article

Calcium phosphates as fillers for methacrylate-based sealer

verfasst von: Flávia Veronezi Rostirolla, Vicente Castelo Branco Leitune, Fabio Rocha Bohns, Fernando Freitas Portella, Susana Maria Werner Samuel, Fabrício Mezzomo Collares

Erschienen in: Clinical Oral Investigations | Ausgabe 12/2019

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Abstract

Objectives

The aim of this study was to evaluate the mineral deposition, push-out bond strength, radiopacity, the degree of conversion, film thickness, flow, calcium ion release, and pH of experimental endodontic sealers containing hydroxyapatite (HAp), aflfa-ticalcium phosphate (α-TCP), or octacalcium phosphate (OCP) particles.

Materials and methods

Fifty single straight root human premolars were instrumented and divided into five groups (n = 10). Experimental endodontic sealers were formulated by 70 wt% urethane dimethacrylate (UDMA), 15 wt% of glycerol-1,3-dimethacrylate (GDMA), 15 wt% of ethoxylated bisphenol A glycol dimethacrylate (BISEMA), camphorquinone (CQ), N,N-dihydroxyethyl-para-toluidine (DHEPT), and benzoyl-peroxide. 10 wt% of each HAp, α-TCP, or OCP were added to the resin and its properties were assessed.

Results

After 7 days, the degree of conversion ranged from 44.69% (G_OCP) to 50.74% (G_control) and no statistical difference were observed (p < 0.05). G_AHplus showed the highest push-out bond strength 4.91 (± 2.38) MPa at 28 days of analysis (p < 0.05). Film thickness and pH were not statistically different (p > 0.05). Statically lower values of flow were found for G_HAp, G_OCP, and G_α-TCP (p < 0.05). Calcium deposition values were higher for G_HAp at 28 days.

Conclusions

Bond strength, degree of conversion, and film thickness of endodontic sealers with phosphates showed similar results compared with AHplus, but displayed higher amounts of Ca²⁺ release.

Clinical relevance

Phosphate fillers improve the performance of endodontic sealers after 28 days of simulated body fluid.

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Titel: Calcium phosphates as fillers for methacrylate-based sealer
verfasst von: Flávia Veronezi Rostirolla
Vicente Castelo Branco Leitune
Fabio Rocha Bohns
Fernando Freitas Portella
Susana Maria Werner Samuel
Fabrício Mezzomo Collares
Publikationsdatum: 13.04.2019
Verlag: Springer Berlin Heidelberg
Erschienen in: Clinical Oral Investigations / Ausgabe 12/2019
Print ISSN: 1432-6981
Elektronische ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-019-02898-w

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Springer Medizin

Calcium phosphates as fillers for methacrylate-based sealer

Abstract

Objectives

Materials and methods

Results

Conclusions

Clinical relevance

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Springer Medizin

Abstract

Objectives

Materials and methods

Results

Conclusions

Clinical relevance

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