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3D mapping of polymerization shrinkage using X-ray micro-computed tomography to predict microleakage.
- Source :
-
Dental materials : official publication of the Academy of Dental Materials [Dent Mater] 2009 Mar; Vol. 25 (3), pp. 314-20. Date of Electronic Publication: 2008 Aug 30. - Publication Year :
- 2009
-
Abstract
- Objectives: The objectives of this study were to (1) demonstrate X-ray micro-computed tomography (microCT) as a viable method for determining the polymerization shrinkage and microleakage on the same sample accurately and non-destructively, and (2) investigate the effect of sample geometry (e.g., C-factor and volume) on polymerization shrinkage and microleakage.<br />Methods: Composites placed in a series of model cavities of controlled C-factors and volumes were imaged using microCT to determine their precise location and volume before and after photopolymerization. Shrinkage was calculated by comparing the volume of composites before and after polymerization and leakage was predicted based on gap formation between composites and cavity walls as a function of position. Dye penetration experiments were used to validate microCT results.<br />Results: The degree of conversion (DC) of composites measured using FTIR microspectroscopy in reflectance mode was nearly identical for composites filled in all model cavity geometries. The shrinkage of composites calculated based on microCT results was statistically identical regardless of sample geometry. Microleakage, on the other hand, was highly dependent on the C-factor as well as the composite volume, with higher C-factors and larger volumes leading to a greater probability of microleakage. Spatial distribution of microleakage determined by microCT agreed well with results determined by dye penetration.<br />Significance: microCT has proven to be a powerful technique in quantifying polymerization shrinkage and corresponding microleakage for clinically relevant cavity geometries.
- Subjects :
- Dental Marginal Adaptation
Fluorescent Dyes
Forecasting
Humans
Materials Testing
Microspectrophotometry
Polymers chemistry
Polymethyl Methacrylate chemistry
Rhodamines
Spectroscopy, Fourier Transform Infrared
Surface Properties
Composite Resins chemistry
Dental Leakage classification
Dental Materials chemistry
Imaging, Three-Dimensional methods
X-Ray Microtomography methods
Subjects
Details
- Language :
- English
- ISSN :
- 1879-0097
- Volume :
- 25
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Dental materials : official publication of the Academy of Dental Materials
- Publication Type :
- Academic Journal
- Accession number :
- 18762335
- Full Text :
- https://doi.org/10.1016/j.dental.2008.07.010