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Effect of combining photoinitiators on cure efficiency of dental resin-based composites
Lara, Lucas; Rocha, Mateus Garcia; Menezes, Livia Rodrigues de; Correr, Américo Bortolazzo; Sinhoreti, Mario Alexandre Coelho; Oliveira, Dayane.
  • Lara, Lucas; Universidade Estadual de Campinas - UNICAMP. Faculdade de Odontologia de Piracicaba. Departamento de Odontologia Restauradora. Piracicaba. BR
  • Rocha, Mateus Garcia; Universidade Federal do Rio de Janeiro. Instituto de Macromoléculas Professora Eloisa Mano. Rio de Janeiro. BR
  • Menezes, Livia Rodrigues de; Universidade Federal do Rio de Janeiro. Instituto de Macromoléculas Professora Eloisa Mano. Rio de Janeiro. BR
  • Correr, Américo Bortolazzo; Universidade Estadual de Campinas - UNICAMP. Faculdade de Odontologia de Piracicaba. Departamento de Odontologia Restauradora. Piracicaba. BR
  • Sinhoreti, Mario Alexandre Coelho; Universidade Estadual de Campinas - UNICAMP. Faculdade de Odontologia de Piracicaba. Departamento de Odontologia Restauradora. Piracicaba. BR
  • Oliveira, Dayane; University of Florida. Division of Operative Dentistry. Department of Restorative Dental Sciences. Gainesville. US
J. appl. oral sci ; 29: e20200467, 2021. tab, graf
Article in English | LILACS | ID: biblio-1286919
ABSTRACT
Abstract Camphorquinone is the most conventionally used photoinitiator in Dentistry. Although different alternative photoinitiators have been proposed, no photoinitiator was capable of completely substituting camphorquinone. The combination of photoinitiators has been considered the best alternative.

Objectives:

To evaluate the effect of combining Norrish type I and II photoinitiators on the cure efficiency of dental resin-based composites.

Methodology:

Experimental composites were produced containing different photoinitiator systems Norrish type I-only, mono-alkyl phosphine oxide (TPO); Norrish type II-only, camphorquinone (CQ); or its combination, CQ and TPO, in a 1 1 molar ratio. UV-vis absorption spectrophotometry was performed to assess the consumption of each photoinitiator after curing (n=3). A multi-wave LED (Bluephase® G2, Ivoclar Vivadent) was pre-characterized and used with a radiant exposure of 24 J/cm2. The degree of conversion was evaluated by Raman spectrometry, and the elution of the monomers by nuclear magnetic resonance analysis (n=3). Data were analyzed using ANOVA and Tukey's test (α=0.05; β=0.2).

Results:

The combination of CQ and TPO increased the consumption of the photoinitiator system compared to CQ-only (p=0.001), but presented similar consumption compared to TPO-only (p=0.52). There was no significant difference in the degree of conversion between the composites regardless of the photoinitiator system (p=0.81). However, the elution of the monomers was reduced when both photoinitiators were combined. TPO-based material presented the highest elution of monomers.

Conclusions:

The combination of the photoinitiator systems seems to be beneficial for the cure efficiency of dental resin-based composites.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Composite Resins / Photoinitiators, Dental Language: English Journal: J. appl. oral sci Journal subject: Dentistry Year: 2021 Type: Article Affiliation country: Brazil / United States Institution/Affiliation country: Universidade Estadual de Campinas - UNICAMP/BR / Universidade Federal do Rio de Janeiro/BR / University of Florida/US

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Full text: Available Index: LILACS (Americas) Main subject: Composite Resins / Photoinitiators, Dental Language: English Journal: J. appl. oral sci Journal subject: Dentistry Year: 2021 Type: Article Affiliation country: Brazil / United States Institution/Affiliation country: Universidade Estadual de Campinas - UNICAMP/BR / Universidade Federal do Rio de Janeiro/BR / University of Florida/US