Calcium phosphates as fillers for methacrylate-based sealer

Rostirolla, Flavia Veronezi, Branco Leitune, Vicente Castelo, Bohns, Fabio Rocha, Portella, Fernando Freitas, Werner Samuel, Susana Maria and Collares, Fabricio Mezzomo (2019) Calcium phosphates as fillers for methacrylate-based sealer. CLINICAL ORAL INVESTIGATIONS, 23 (12). pp. 4417-4423.

Text
Rostirolla et al., 2019.pdf - Submitted version
Download (73kB) | Preview

Official URL: http://dx.doi.org/10.1007/s00784-019-02898-w

Abstract

<h4>Objectives</h4>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.<h4>Materials and methods</h4>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.<h4>Results</h4>After 7 days, the degree of conversion ranged from 44.69% (G<sub>OCP</sub>) to 50.74% (G<sub>control</sub>) and no statistical difference were observed (p < 0.05). G<sub>AHplus</sub> 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<sub>HAp</sub>, G<sub>OCP</sub>, and G<sub>α-TCP</sub> (p < 0.05). Calcium deposition values were higher for G<sub>HAp</sub> at 28 days.<h4>Conclusions</h4>Bond strength, degree of conversion, and film thickness of endodontic sealers with phosphates showed similar results compared with AHplus, but displayed higher amounts of Ca<sup>2+</sup> release.<h4>Clinical relevance</h4>Phosphate fillers improve the performance of endodontic sealers after 28 days of simulated body fluid.

Item Type:	Article
Uncontrolled Keywords:	Root canal obturation, Materials testing, Tricalcium phosphate, Inorganic particles
Depositing User:	Symplectic Admin
Date Deposited:	12 Dec 2019 08:37
Last Modified:	19 Jan 2023 00:13
DOI:	10.1007/s00784-019-02898-w
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3065919