10.25241/stomaeduj.2018.5(3).art.1 – abstract

DENTAL MATERIALS

Light transmission through resin composites

DOI: https://doi.org/10.25241/stomaeduj.2018.5(3).art.1

Abstract

Introduction: The study aimed to quantify the amount of light that passes through different resin-based composite (RBC) types and to assess if a clinically used polymerization procedure in curing incrementally filled deep cavities is justified.

Methodology: Light transmission through 2-mm thick specimens made of three regular RBCs – a nano, a flowable nano and a microhybrid – of the same shade A3, was analyzed under 24 different curing conditions, that resulted by varying the curing mode, exposure distance and exposure time when using a violet-blue LED light curing unit. Incident and transmitted irradiances were assessed in real-time on a spectrophotometer and radiant exposure, transmittance (T) and absorbance (A) were calculated. A multivariate analysis assessed the effects of various parameters on T and A.

Results: Incident irradiance varied among 656.4 (8.1) mW/cm² (Standard mode, exposure distance = 7 mm) and 3361.5 (33.6) mW/cm² (Plasma Emulation mode, 0 mm). The filler amount (weight and volume %) exerted a significant effect on transmitted irradiance (p < 0.001; partial eta squared ηP² = 0.400 and 0.362, respectively) while the effect of exposure distance was low (p < 0.001, ηP² = 0.141). Light transmittance was material-dependent and very low. The significant lowest absorbance was identified in Filtek Supreme XTE flow (1.11 ± 0.09), followed by Filtek Silorane (1.21 ± 0.03) and Filtek Supreme XTE (1.62 ± 0.13). Incident and transmitted radiant exposure correlated exceptionally well in each RBC (Pearson correlations coefficient > 0.99).

Conclusion: When restoring a deep cavity with regular RBCs, each increment needs to be cured adequately, since final curing to compensate for deficits in polymerisation is insufficient.

Keywords: resin-based composites, light curing unit, irradiance, radiant exposure, transmittance, absorbance.

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STOMATOLOGY EDU JOURNAL (Stoma Edu J) is a new international dental journal whose main purpose is to inform researchers, educators, graduates, postgraduates and practitioners about the latest trends in the field, which followed, would bring immediate and lasting benefits to the patients; and about opinions of the most authorized specialists on what is best in current practice, for the good of both, patient and dentist.
STOMATOLOGY EDU JOURNAL (Stoma Edu J) is a peer-reviewed, open access international dental journal to be database indexed, meant to contribute to the development and completion of the medical training of practitioners as Dr. Greene Vardiman Black stated: “the professional man has no right to be other than a continual student”.
Open access journal, means that all content is freely available without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking prior permission from the publisher or the author.