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Non-destructive characterization of voids in six flowable composites using swept-source optical coherence tomography
Amir Nazari1, Alireza Sadr, Mohammad Ali Saghiri
1Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
Swept-source optical coherence tomography (SS-OCT) reliably detects voids in flowable composites. Void frequency and volume varied significantly between materials, indicating material dependency in void formation.
Area of Science:
- Dental Materials Science
- Biomedical Imaging
Background:
- Void formation in dental restorations can compromise their integrity and longevity.
- Flowable composites are widely used, but their void content requires careful evaluation.
Purpose of the Study:
- To assess void frequency (V(F)) and void volume (V(V)) in six different flowable composites using swept-source optical coherence tomography (SS-OCT).
- To compare SS-OCT void detection with micro-computed tomography (micro-CT) and evaluate material-specific void formation characteristics.
Main Methods:
- Standard class I cavities were filled with six flowable composites and scanned using SS-OCT.
- OCT tomograms were analyzed to calculate average V(F) and V(V) per restoration.
- Flowability and SEM analysis were performed; SS-OCT results were compared with micro-CT.
Main Results:
- Significant differences in V(F) and V(V) were observed among the composites (p<0.05).
- Voids ranging from 35 to 785 μm were detected; Clearfil Majesty LV showed the highest void content.
- Filler volume correlated positively with void formation; SS-OCT void measurements were validated by micro-CT (p<0.001, r=0.94).
Conclusions:
- SS-OCT is a reliable tool for real-time void characterization in composite materials and restorations.
- Void formation in flowable composites is dependent on the specific material used.
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