Advanced search
Start date
Betweenand
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Bond Strength of Methacrylate-based Blends Containing Elastomeric Monomers and Alternative Initiators after Thermomechanical Cycling

Full text
Author(s):
Ely, Caroline [1] ; Ottoboni, Thiago Dias [1] ; Kumagai, Rose Yakushijin [1] ; de Souza, Natalia Alves [1] ; Ramos, Tatiana da Silva [2] ; Galvao Arrais, Cesar Augusto [3] ; Piva, Evandro [2] ; Reis, Andre Figueiredo [4]
Total Authors: 8
Affiliation:
[1] Univ Guarulhos, Dent Res & Grad Studies Div, Dept Restorat Dent, Guarulhos, SP - Brazil
[2] Univ Fed Pelotas, Biomat Dev & Control Ctr, Pelotas, RS - Brazil
[3] State Univ Ponta Grosse, Dept Dent, Ponta Grossa, PR - Brazil
[4] Univ Florida, Dept Restorat Dent Sci, Div Operat Dent, Coll Dent, Gainseville, FL - USA
Total Affiliations: 4
Document type: Journal article
Source: Journal of Adhesive Dentistry; v. 21, n. 3, p. 281-286, MAY-JUN 2019.
Web of Science Citations: 0
Abstract

Purpose: To evaluate the bond strength to dentin produced by experimental adhesives formulated with an elasto-meric methacrylate monomer (EMM) and an alternative initiator system based on a Thioxanthone derivative (QTX). Materials and Methods: A self-etching primer was used. For the bonding resin, a model adhesive (G1) was formulated containing bis-GMA/TEG-DMA/HEMA (co-monomeric blend) + CQ/EDAB (initiator system). The other groups were formulated by adding to this formulation: EMM only (G2), QTX (G3), or EMM and QTX (G4). Clearfil SE Bond was used as the commercial control group. Fifty bovine teeth (n = 5) were restored with each one of the five adhesives. After restorative procedures, half of the specimens were stored in distilled water at 37 degrees C for 24 h. The other half was fixed on a metal stub and subjected to 200,000 mechanical (50 N loading at 2 Hz frequency) and 1000 thermal cycles (5 degrees C and 55 degrees C). Afterwards, specimens were serially sectioned into beams and tested in tension until fracture. Bond strengths were statistically analyzed by two-way ANOVA and Tukey's test (alpha = 5%). Results: After 24 h, significantly higher mu TBS was observed for the formulation containing EMM and QTX (G4) when compared to Clearfil SE Bond (p < 0.05). No significant differences in mu TBS were detected among the experimental groups after 24 h (p>0.05). After thermomechanical cycling, no significant differences were observed among groups. Conclusion: The addition of EMM and QTX can be considered as possible alternative in dental adhesive formulations. (AU)

FAPESP's process: 14/23401-3 - Development of monomeric blends containing methacrylates with elastomeric behavior in association with photoinitiated alternative systems for application in dental materials
Grantee:André Figueiredo Reis
Support type: Regular Research Grants