Polywave And Monowave Light-Curing Units Effects On Polymerization Efficiency Of Different Photoinitiators

Authors

DOI:

https://doi.org/10.14295/bds.2021.v24i4.2661

Abstract

Objective: of this study was to characterize and correlate the absorption spectra of three photoinitiators [camphorquinone (CQ), diphenyl(2,4,6-trimethylbenzoyl) phosphine oxide (TPO) and phenylbis (2,4,6-trimethylbenzoyl)-phosphine oxide (BAPO)], using second or third-generation light curing units (LCU), and to evaluate the degree of conversion and the physical properties of an experimental resin adhesive.  Material and methods: Second-generation (Radii-cal® and Emitter D®) and third-generation (Valo® Cordless and Bluephase N®) LCU were assessed regarding spectrum and irradiance rate of emitted light. Also, the photoinitiators (CQ, TPO and BAPO) were characterized by a light absorption spectrum assessed by UV-Vis spectroscopy, degree of conversion and yellowing effect. Statistical analyzes considered two-way ANOVA and post-hoc Tukey test.  Results: BAPO presented higher reactivity compared to TPO. Regarding degree of conversion of the photoinitiators activated by different light-curing units, the Emitter D® device promoted a high degree of conversion. BAPO presented the highest yellowing effect values. Conclusions: The emission and absorption characteristics of the photoinitiators were different. The polymerization reaction activated by the second-generation light-curing unit was reduced when using an experimental resin with photoinitiator TPO, and the third-generation light-curing unit showed a higher polymerization potential regardless of the photoinitiator.

Keywords

Light-curing of dental adhesives;  Photoinitiators dental; Curing lights dental.

Author Biographies

Peterson Oliveira Boeira, Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, Brazil.

Peterson Oliveira Boeira (DDS, PhD student)

Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, Brazil.

Mateus de Azevedo Kinalski, Federal University of Pelotas

Mateus de Azevedo Kinalski (MS, PhD student)

Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, Brazil.

Mateus Bertolini Fernandes dos Santos, Federal University of Pelotas

Mateus Bertolini Fernandes dos Santos (Professor, PhD) 

Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, Brazil.

Rafael Ratto de Moraes , Federal University of Pelotas, Pelotas

Rafael Ratto de Moraes (Professor, PhD)

Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, Brazil.

Giana Silveira Lima, Federal University of Pelotas

Giana da Silveira Lima (Professor, PhD)

Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, Brazil.

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Published

2021-10-01

Issue

Section

Clinical or Laboratorial Research