Abstract
Purpose: To nondestructively evaluate the porosity of ten contemporary resin composite core materials using microtomographic (microCT) analysis. Material and methods: Resin composite core material samples (n = 12) including dual-cure, visible light cure only, and a self-cure material were fabricated using a standardized mold following manufacturer's recommendations. After storage in phosphate buffered saline for one week, specimens were analyzed using a microCT unit at 5.3-µm resolution over a rotational range of 360°. Image 3D recombination and analysis was accomplished using microCT software. Evaluated parameters included material volume investigated, closed pore number and volume, as well as closed pore percentage. Parameter mean values were evaluated with Kruskal-Wallis/Dunn at a 95% confidence level (α = 0.05). Results: Mean percent total porosity with standard deviation identified significant differences in decreasing order as Ti-Core: 2.2 (0.4) > Ti-Core Auto E: 1.3 (0.3) = Ti-Core Flow Plus: 1.1 (0.02) > Clearfil Photo Core: 0.94 (0.5) = Clearfil DC Core Plus: 0.6 (0.18) = MultiCore Flow: 0.58 (0.1) > Fluorocore 2+: 0.14 (0.2) = Build-It FR: 0.068 (0.02) = Gradia Core: 0.03 (0.02) = Rebilda DC: 0.02 (0.01). A pilot microCT evaluation evaluating a mixing tip revealed incomplete mixture between the two resins with porosity introduced from turbulence as the materials are forced through the tip during preparation. Conclusions: A wide range of porosity was identified between the ten materials evaluated. These preliminary results warrant more investigation evaluating additional resin composite core materials, the preparation capabilities of automix tips, and porosity presence in the unmixed materials.
| Original language | English |
|---|---|
| Pages (from-to) | 623-630 |
| Number of pages | 8 |
| Journal | Journal of Prosthodontics |
| Volume | 29 |
| Issue number | 7 |
| DOIs | |
| State | Published - Aug 1 2020 |
Bibliographical note
Publisher Copyright:© 2020 by the American College of Prosthodontists
Funding
None of the authors declare any commercial interest or conflicts of interest in any of the products or techniques used in this study. Any opinions stated in this study are of the authors only and do not represent the official opinion of the United States Air Force, the Department of Defense, the Uniformed Services University of the Health Sciences, or the United States Government.
| Funders | Funder number |
|---|---|
| U.S. Department of Defense | |
| U.S. Air Force | |
| Uniformed Services University of the Health Sciences |
Keywords
- Core material
- MicroCT
- Porosity
- Resin composite
ASJC Scopus subject areas
- General Dentistry