Impact of photoinitiator quality on chemical-mechanical properties of dental adhesives under different light intensities
DOI:
https://doi.org/10.4322/bds.2023.e3704Abstract
Objective: Evaluate the mechanical properties of experimental adhesive models with different photoinitiators
(PI) polymerized by LED units of different power densities. Material and Methods: Three groups of adhesive
models based on HEMA/BisGMA (45/55) were prepared in association with different PI combinations: G2
(control) – 2 PI: 0.5% CQ, 0.5% EDMAB; G3 - 3 PI: 0.5% CQ; 0.5% DMAEMA, 0.5% DPIHP; G4 - 4 PI: 0.5%
CQ; 0.5% EDMAB; 0.5% DMAEMA; 0.5% DPIHP. The three formulations were polymerized at two different
LED power densities: 550 mW/cm2 and 1200 mW/cm2. The degree of conversion (DC) of adhesive monomers
was monitored in situ through the FTIR for 600 s. Specimens were prepared for each formulation for analysis of
flexural strength (FS), modulus of elasticity (ME), sorption (SOR) and solubility (SOL). Data were submitted to
two-way ANOVA and Tukey tests (5%). Results: DC: there is a significant difference among adhesive systems
(G2<G3<G4). FS and ME: significant differences were found between densities, with the lowest average for
550 mW/cm2. SOR and SOL: adhesives polymerized at 1200 mW/cm2 presented higher sorption and solubility.
Conclusion: The mechanical properties of the adhesive models are directly related to the types of photoinitiatiors
and the LED power densities.
KEYWORDS
Dental adhesive; Irradiance; Light-curing; Photoinitiators; Physicochemical phenomena.
Author Biography
Sergio Eduardo de Paiva Gonçalves, Universidade Estadual Paulista Júlio de Mesquita Filho - UNESP, Instituto de Ciência e Tecnologia de São José dos Campos, Departamento de Odontologia Restauradora, São José dos Campos, SP, Brazil.
Date of Birth: April, 30th, 1965
1986 Licenciated in Dentistry (DDS, Sao Paulo State University-UNESP)
1994 Master Degree in Restorative Dentistry (MS, Sao Paulo State University-UNESP)
1995 Licenciate in Laser applications (University of Sao Paulo, SP)
1997 Doctorate in Restorative Dentistry (PhD, Sao Paulo State University-UNESP)
2005 Associate Professor at Sao Paulo State University-UNESP
2011 Invited Visiting Researcher (BERC- Bioengineering Research Center, University of Kansas-USA)
2012 Present- Editor-in-chief of the Brazilian Dental Science Journal
2017 Present- Vice President of the GBPD (Brazilian Group of Professors in Dentistry); Member of IADR (International Association of Dental Research); Member of ADM (Academy of Dental Materials); Member of ALODYB (Latim America Association in Operative Dentistry)
2018 Present- Full Professor at Sao Paulo State University-UNESP
He has authored about 100 scientific and clinical articles in peer-reviewed journals, is a well-sought lecturer, receiver of several awards and has held many continuing education courses in Brazil and Latim America. His expertise is on Restorative Dentistry and his scientific work focuses on adhesion to dental tissues, chemical and mechanical properties of dental materials and laser.
He was vice-coordinator of Graduate Program in Restorative Dentistry and Head of Restorative Dentistry Department at Sao Paulo State University. He was also responsable for the undergraduation disciplines, as: Operative Dentistry, Restorative Dentistry and Dental Sculpture.
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