10.25241/stomaeduj.2019.6(1).art.1-abstract

DENTAL MATERIALS

Effects of exposure time and exposure distance on the micro-mechanical properties of light cured pit and fissure sealants

DOI: https://doi.org/10.25241/stomaeduj.2019.6(1).art.1

Abstract

Introduction The study aimed to perform comparative measurements on the effect of exposure time and exposure distance on the micro-mechanical properties Vickers hardness (HV) and indentation modulus (E) of light cured, resin-based pit and fissure sealants.
Material and Methods Thirteen pit and fissure sealants were selected. Combinations of three clinically relevant exposure times (10, 20, 40 s) and two, fixed sample – light source exposure distances (4 and 7 mm) were tested. The HV and E of each group (n = 6) were measured with an automatic hardness indenter. Data were analyzed by a multi-variant analysis and partial eta-squared (ηp2) statistic.
Results The factor “material” had the most significant influence (significance level α ≤ 0.05) on the measured micro-mechanical properties E and HV as shown by a ηp2 statistic (ηp2 = 0.939 and 0.927 respectively). The factor “exposure time” had a significant but moderate influence on both material properties E and HV (ηp2 = 0.297 and 0.084) whereas a smaller but significant effect of the factor “exposure distance” was only observed for E (ηp2 = 0.049).
Conclusions Properties E and HV are strongly influenced by the type of sealant. On the other hand, the exposure distance had a low influence on these, whilst the exposure time had a greater influence. Exposure time and to a lesser extent exposure distance have a significant effect on the micro-mechanical properties of pit and fissure sealants.
Practical Implications We conclude these findings indicate exposure time to be more significant when considering clinical application of these materials.

Keywords Pit and fissure sealants; micro-mechanical properties; pediatric dentistry; dental materials; curing.

Figures are shown in pdf document

| (read pdf) |

PUBLISH WHIT US

We are celebrating 10 years of continuous publication and 30 issues released!
For over ten years, the Stomatology Edu Journal (Stoma Edu J) has been publishing for academic readers, scholars, and general dental practitioners.

If you have reviewed the current issue and found articles of interest, we invite you to submit your own paper to the Stomatology Edu Journal for the next issue at

Your choice is supported by the following arguments offered by the Stomatology Edu Journal:

Fast — rapid review and publication

Rigorous — peer-reviewed by at least two members of the academic community

Open — articles are freely available to all

Visible — enhanced browsing and searching to ensure your article is noticed

Global — worldwide media coverage

STATEMENT

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.