By a News Reporter-Staff News Editor at Health & Medicine Week -- Investigators publish new report on Optical Coherence Tomography. According to news reporting from Tokyo, Japan, by NewsRx journalists, research stated, "To investigate the effect of composite type and cavity size on gap and void formation using optical coherence tomography (OCT). Class I cavities of two depths (2 mm or 4 mm; 4 mm diameter) were prepared, treated with Tri-S Bond (Kuraray Medical), and bulk filled with either Surefil SDR Flow (SF; Dentsply) or Clearfil Majesty LV (MJ; Kuraray Medical) to form four groups."
The news correspondents obtained a quote from the research from Tokyo Medical and Dental University, "After 24 h, the specimens were 3D scanned using swept-source OCT (Santec) with 1310 nm laser at a 20 kHz sweep rate. In OCT tomograms, the bonding interface and the bulk of the restorations were evaluated. The percentage values of sealed interfaces (SP) and void volume (VP) for all groups were calculated and statistically analyzed using two-and one-way ANOVA and Tukey's post-hoc test. Selected specimens were cross sectioned and observed using a scanning electron microscope (SEM) and a confocal laser scanning microscope to confirm OCT findings. The following values were obtained for SP and VP, respectively: SF-2mm: 92% and 0.08%; SF-4mm: 66% and 0.13%; MJ-2mm: 86% and 1.79%; MJ-4mm: 33% and 1.96%. Both composites showed a significant increase in gap formation at 4-mm cavity depth (p technology performed better than the conventional composite; however, bulk filling a 4-mm-deep cavity will compromise the sealing of the bonding interface regardless of the type of composite."
According to the news reporters, the research concluded: "OCT is a unique method of characterizing materials and their behaviors nondestructively and precisely."
For more information on this research see: 3D assessment of void and gap formation in flowable resin composites using optical coherence tomography. The Journal of Adhesive Dentistry, 2013;15(3):237-43. The Journal of Adhesive Dentistry can be contacted at: Quintessence Publ Co Inc, 551 North Kimberly Dr, Carol Stream, IL 60188-1881, USA (see also Optical Coherence Tomography).
Our news journalists report that additional information may be obtained by contacting A. Nazari, Dept. of Restorative Sciences, Tokyo Medical and Dental University, Tokyo, Japan. Additional authors for this research include A. Sadr, Y. Shimada, J. Tagami and Y. Sumi.
Publisher contact information for the The Journal of Adhesive Dentistry is: Quintessence Publ Co Inc, 551 North Kimberly Dr, Carol Stream, IL 60188-1881, USA.
Keywords for this news article include: Asia, Tokyo, Japan, Imaging Technology, Optical Coherence Tomography.
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