Hygroscopic expansion of bulk fill composites: A three-month report

Authors

  • Elham Hasani Dental Research Center – Research Institute of Dental Sciences – Shahid Beheshti University of Medical Science – Tehran – Iran.
  • Narges Panahandeh Preventive Dentistry Research Center – Research Institute of Dental Sciences – Shahid Beheshti University of Medical Science – Tehran – Iran.
  • Sayna Shamszadeh Dental Research Center – Research Institute of Dental Sciences – Shahid Beheshti University of Medical Science – Tehran – Iran.
  • Ahmad Najafi Abrandabadi Preventive Dentistry Research Center – Research Institute of Dental Sciences – Shahid Beheshti University of Medical Science – Tehran – Iran.
  • Seyedeh Mahsa Sheikh-Al-Eslamian Preventive Dentistry Research Center – Research Institute of Dental Sciences – Shahid Beheshti University of Medical Science – Tehran – Iran.

DOI:

https://doi.org/10.14295/bds.2018.v21i2.1521

Abstract

Polymer networks are considered to be largely affected by water and chemical absorption from environment. Objective: The aim of this study was to evaluate the hygroscopic expansion of bulk-fill composite. Material and Methods: Fifteen disks (5 in each group) with different thickness(4mm/2mm) of Tetric N-Ceram Bulk Fill composite(TB) and Tetric N-Ceram composite(TN) were made according to the manufacturer’s instruction and stored in deionized water. The length of each specimen was recorded using a digital micrometer at baseline and at the end of 24 h, 1, 2, 4, 12 weeks intervals. Repeated measure ANOVA and Tukey HSD were used to determine the effect of variables. At 12 weeks, the mean hygroscopic expansion after water immersion ranged between 0. 33±0.09mm for TN to 0.41±0.07mm for TB with 2mm thickness. Repeated measure ANOVA revealed a significant increase in hygroscopic expansion over time (P<0.05). Results: The results indicated that at 24hours and 2weeks there was a significant difference among TN and TBwith 4mm thickness (p=0.007 and p=0.023, respectively). The other differences were not significant. Hygroscopic expansion affected by the type of composite and the passing of time. Conclusion: The results showed that the time taken to reach stabilization in hygroscopic expansion was shorter for TN in comparison with TB. For 2mm thickness equilibrium was attained earlier.

 

Keywords

Water; Expansion; Composites; Polymerization; Bulk-fill.

Downloads

Download data is not yet available.

Downloads

Additional Files

Published

2018-04-19

How to Cite

1.
Hasani E, Panahandeh N, Shamszadeh S, Abrandabadi AN, Sheikh-Al-Eslamian SM. Hygroscopic expansion of bulk fill composites: A three-month report. BDS [Internet]. 2018 Apr. 19 [cited 2025 Aug. 21];21(2):172-6. Available from: https://ojs.ict.unesp.br/index.php/cob/article/view/1521

Issue

Vol. 21 No. 2 (2018): Apr. - Jun. / 2018 - Published April 2018

Section

Clinical or Laboratorial Research

License

Brazilian Dental Science uses the Creative Commons (CC-BY 4.0) license, thus preserving the integrity of articles in an open access environment. The journal allows the author to retain publishing rights without restrictions.

=================

COPYRIGHT TRANSFER AND RESPONSIBILITY STATEMENT
 (PDF)

For all articles published in the BDS journal, copyright is retained by the authors. Articles are licensed under an open-access Creative Commons CC BY 4.0 license, meaning that anyone may download and read the paper for free. In addition, the article may be reused and quoted, provided that the original published version is cited. These conditions allow for maximum use and exposure of the work while ensuring that the authors receive proper credit. All metadata associated with published articles is released under the Creative Commons CC0 Universal Public Domain Dedication.

Before the submission, authors must obtain permission to reproduce any published material (figures, schemes, tables, or any extract of a text) that does not fall into the public domain or for which they do not hold the copyright. Permission should be requested by the authors from the copyright holder (usually the Publisher, please refer to the imprint of the individual publications to identify the copyright holder).

The authors hereby attest that the study is original and does not present manipulated data, fraud, or plagiarism. All names listed made a significant scientific contribution to the study, are aware of the presented data, and agree with the final version of the manuscript. They assume complete responsibility for the ethical aspects of the study.

This text must be printed and signed by all authors. The scanned version should be submitted as supplemental file during the submission process.