Real-time in-depth imaging of gap formation in bulk-fill resin composites
| Autor: | Alireza Sadr, Tomoko Numata, Tomohiro Takagaki, Junji Tagami, Juri Hayashi, Yasushi Shimada, Daniel Chan, Jorge Espigares |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Resin composite Bulk fill 030206 dentistry 02 engineering and technology Dental Caries 021001 nanoscience & nanotechnology Composite Resins Polymerization 03 medical and health sciences Cross-Sectional Studies 0302 clinical medicine Depth imaging Mechanics of Materials Materials Testing Humans General Materials Science Composite material 0210 nano-technology General Dentistry Curing (chemistry) Shrinkage Volumetric shrinkage |
| Zdroj: | Dental Materials. 35:585-596 |
| ISSN: | 0109-5641 |
| Popis: | This study visualized in real-time the gap forming of bulk-fill resin composites during polymerization using optical coherence tomography (OCT).Light-cured bulk-fill resin composites; Tetric N-ceram Bulk Fill (TNB), SonicFill (SNF), Surefil SDR (SDR), dual-cured bulk-fill resin composite Bulk EZ (BEZ), and light-cured core resin composite Clearfil Photo Core (CPC) were investigated. Swept-source OCT real-time cross-sectional monitoring was obtained during resin composite placement and curing procedure. Gap formation was observed in bonded cylindrical resin composite molds (4-mm depth, 3-mm diameter) and free shrinkage volume was observed at the top and bottom of a tube with similar dimensions (n=10). OCT 3D data were analyzed to calculate sealing floor area percentage (SFA%) and volumetric shrinkage in bonded tube (VS%). Data were analyzed by ANOVA at significance level of 0.05. The bottom-top degree of conversion ratio (DC%-R) through 4-mm depth was measured using the XploRA Plus micro-Raman spectroscopy.BEZ showed no gap formation at the cavity floor in any specimens while SNF showed the highest gap formation; the statistical order in terms of SFA% was BEZ (100±0)TNB (84.97±2.98)CPC (52.13±8.23)=SDR (45.97±9.21)SNF (16.23±6.00) (p0.05). On the other hand, total VS% was statistically ordered as BEZ (3.40±0.14)SDR (3.22±0.09)TNB (1.82±0.11)SNF (1.65±0.04)=CPC (1.56±0.04) (p0.05). Unlike BEZ, the light-cured resin composites showed larger shrinkage at specimen bottom than top. TNB showed the lowest DC%-R followed by SNF (p0.05).Light-cured bulk-fill resin composites showed various degrees of gap formation and shrinkage at 4-mm deep cavity. The dual-cured bulk-filled resin composite showed no decrease of degree of conversion through the depth and the highest cavity adaptation despite its tendency for higher volumetric shrinkage. |
| Databáze: | OpenAIRE |
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