Influence of irradiation exposure time on the depth cure of restorative resin composite

Authors

  • Francesca Fabiano Università degli Studi di Messina
  • Chiara Borsellino Univesità degli Studi di Messina
  • Lucio Maria Bonaccorsi Università degli Studi di Messina
  • Luigi Calabrese Università degli Studi di Messina
  • Valerio Fabiano Università degli Studi di Messina
  • Giuseppe Mavilia Università degli Studi di Messina

DOI:

https://doi.org/10.1478/AAPP.92S1A1

Keywords:

resin composite, microhardness, depth of cure, SEM, curing time, buildup layering technique

Abstract

A study was conducted to evaluate the degree of conversion by the hardness measurements of a commercial resin composite. The specimens were prepared according to ISO 4049 and photo-activated for 20s – 40s – 60s with  a light-emitting diodes (LEDs). To establish the optimal increment technique mono-layers 1 mm and 2 mm thick were tested. The ratio bottom-to-top was assessed for the mono-layers groups. Vickers hardness profiles were measured for mono-layer, bi-layer and tri-layer along the cross-section. The microhardness map showed difference in the mechanical characteristic of overlying resin confirmed by SEM images analysis of the fracture mechanics. Curing effectiveness of resin composite is not only dependent on the curing light unit but also from thickness of the resin composite and the duration of the exposure. The data suggest that an exposure time of 40 s or higher is required to provide composites with a homogeneous and high hardness, moreover, a 1 mm buildup multi-layering technique results in adequate curing of the bottom layer and better mechanical properties.

Author Biographies

  • Francesca Fabiano, Università degli Studi di Messina

    PhD

    Department of Electronic Engineering, Industrial Chemistry and Engineering.

    Department of Experimental, Specialized Medical-Surgical and Odontostomatological Sciences.

     

  • Chiara Borsellino, Univesità degli Studi di Messina

    Associate Professor of

    Department of Civil Engineering, Computing, Construction, Environmental and Applied Mathematics

  • Lucio Maria Bonaccorsi, Università degli Studi di Messina

    Researcher of

    Department of Electronic Engineering, Industrial Chemistry and Engineering

  • Luigi Calabrese, Università degli Studi di Messina

    Researcher of

    Department of Electronic Engineering, Industrial Chemistry and Engineering

  • Valerio Fabiano, Università degli Studi di Messina

    Associate Professor of

    Department of Civil Engineering, Computing, Construction, Environmental and Applied Mathematics.

    Department of Experimental, Specialized Medical-Surgical and Odontostomatological Sciences

  • Giuseppe Mavilia, Università degli Studi di Messina

    PhD of

    Department of Electronic Engineering, Industrial Chemistry and Engineering

Archimede by Domenico Fetti (1620)

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Additional Files

Published

2014-02-24

Issue

Vol 92, SUPPLEMENT NO 1 (2014): PISRS Proceedings (Part III)

Section

PISRS: Analysis, Differential Geometry and Mechanics

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