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Clinical Oral Investigations

Published in:

01-11-2014 | Original Article

Light transmittance and micro-mechanical properties of bulk fill vs. conventional resin based composites

Authors: Stefan Bucuta, Nicoleta Ilie

Published in: Clinical Oral Investigations | Issue 8/2014

Abstract

Objectives

The aim of this study was to quantify the blue light that passes through different incremental thicknesses of bulk fill in comparison to conventional resin-based composites (RBCs) and to relate it to the induced mechanical properties.

Materials and methods

Seven bulk fill, five nanohybrid and two flowable RBCs were analysed. Specimens (n = 5) of three incremental thicknesses (2, 4 and 6 mm) were cured from the top for 20 s, while at the bottom, a spectrometer monitored in real time the transmitted irradiance. Micro-mechanical properties (Vickers hardness, HV, and indentation modulus, E) were measured at the top and bottom after 24 h of storage in distilled water at 37 °C. Electron microscope images were taken for assessing the filler distribution and size.

Results

Bulk fill RBCs (except SonicFill) were more translucent than conventional RBCs. Low-viscosity bulk fill materials showed the lowest mechanical properties. HV depends highly on the following parameters: material (η_p ² = 0.952), incremental thickness (0.826), filler volume (0.747), filler weight (0.746) and transmitted irradiance (0.491). The bottom-to-top HV ratio (HV_bt) was higher than 80 % in all materials in 2- and 4-mm increments (except for Premise), whereas in 6-mm increments, this is valid only in four bulk fill materials (Venus Bulk Fill, SDR, x-tra fil, Tetric EvoCeram Bulk Fill).

Conclusions

The depth of cure is dependent on the RBC’s translucency. Low-viscosity bulk fill RBCs have lower mechanical properties than all other types of analysed materials. All bulk fill RBCs (except SonicFill) are more translucent for blue light than conventional RBCs.

Significance

Although bulk fill RBCs are generally more translucent, the practitioner has to follow the manufacturer’s recommendations on curing technique and maximum incremental thickness.

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Title: Light transmittance and micro-mechanical properties of bulk fill vs. conventional resin based composites
Authors: Stefan Bucuta
Nicoleta Ilie
Publication date: 01-11-2014
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 8/2014
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-013-1177-y

At a glance: The STEP trials

Springer Medicine

Light transmittance and micro-mechanical properties of bulk fill vs. conventional resin based composites

Abstract

Objectives

Materials and methods

Results

Conclusions

Significance

At a glance: The STEP trials

Springer Medicine

Abstract

Objectives

Materials and methods

Results

Conclusions

Significance

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