Wei-Chi Chen , Shu-Fen Chuang , Po-Chun Tseng , Ting-Weng Lai , Terry Yuan-Fang Chen , Yung-Nien Sun
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Finally, different particles (70–80 µm glass beads, 150–212 µm glass beads, and 75–150 µm zirconia powder) were added to Z350F to inspect the analyzing quality.</p></div><div><h3>Results</h3><p>The analyses revealed a high correlation (>99.99%) for virtual movements within 131 pixels (639 µm) and low errors (<5.21%) within a 10-µm physical movement. A subset size of 51 × 51 pixels demonstrated the convergence of correlation coefficients and calculation time. The refractive index of Z350F did not change significantly after polymerization. Adding glass beads or zirconia particles caused light reflection or shielding in OCT images, whereas blank Z350F produced the best DIC analysis results.</p></div><div><h3>Significance</h3><p>The OCT-based DIC analysis with the experimental conditions is feasible in measuring polymerization shrinkage of RBC restorations. The subset size in the DIC analysis should be identified to optimize the analysis conditions and results. 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引用次数: 0
摘要
目的:研究基于光学相干断层扫描(OCT)的数字图像相关性分析的可行性,并确定聚合收缩测量的实验参数:研究基于光学相干断层扫描(OCT)的数字图像相关性(DIC)分析的可行性,并确定测量聚合收缩率的实验参数:在牛门牙上制备 I 类龋洞,用 Filtek Z350XT Flowable (Z350F) 填充。对聚合修复体的一张 OCT 图像进行处理,生成虚拟位移图像。此外,还在 OCT 扫描下移动牙齿样本。DIC 软件分析了这些虚拟和物理转换集,并评估了子集大小对准确性的影响。通过 OCT 图像测量了未聚合和聚合 Z350F 的折射率。最后,在 Z350F 中加入了不同的颗粒(70-80 微米的玻璃珠、150-212 微米的玻璃珠和 75-150 微米的氧化锆粉末),以检测分析质量:分析结果显示,131 像素(639 微米)范围内的虚拟移动具有较高的相关性(>99.99%),误差较小(显著性):在实验条件下,基于 OCT 的 DIC 分析可用于测量 RBC 修复体的聚合收缩。应确定 DIC 分析中的子集大小,以优化分析条件和结果。此方法不建议使用高反射或低反射颗粒。
Assessments of polymerization shrinkage by optical coherence tomography-based digital image correlation analysis—Part I: Parameter identification
Objective
To investigate the feasibility of optical coherence tomography (OCT)-based digital image correlation (DIC) analysis and to identify the experimental parameters for measurements of polymerization shrinkage.
Methods
Class I cavities were prepared on bovine incisors and filled with Filtek Z350XT Flowable (Z350F). One OCT image of the polymerized restoration was processed to generate virtually displaced images. In addition, the tooth specimen was physically moved under OCT scanning. A DIC software analyzed these virtual and physical transformation sets and assessed the effects of subset sizes on accuracy. The refractive index of unpolymerized and polymerized Z350F was measured via OCT images. Finally, different particles (70–80 µm glass beads, 150–212 µm glass beads, and 75–150 µm zirconia powder) were added to Z350F to inspect the analyzing quality.
Results
The analyses revealed a high correlation (>99.99%) for virtual movements within 131 pixels (639 µm) and low errors (<5.21%) within a 10-µm physical movement. A subset size of 51 × 51 pixels demonstrated the convergence of correlation coefficients and calculation time. The refractive index of Z350F did not change significantly after polymerization. Adding glass beads or zirconia particles caused light reflection or shielding in OCT images, whereas blank Z350F produced the best DIC analysis results.
Significance
The OCT-based DIC analysis with the experimental conditions is feasible in measuring polymerization shrinkage of RBC restorations. The subset size in the DIC analysis should be identified to optimize the analysis conditions and results. Uses of hyper- or hypo-reflective particles is not recommended in this method.
期刊介绍:
Dental Materials publishes original research, review articles, and short communications.
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The principal aim of Dental Materials is to promote rapid communication of scientific information between academia, industry, and the dental practitioner. Original Manuscripts on clinical and laboratory research of basic and applied character which focus on the properties or performance of dental materials or the reaction of host tissues to materials are given priority publication. Other acceptable topics include application technology in clinical dentistry and dental laboratory technology.
Comprehensive reviews and editorial commentaries on pertinent subjects will be considered.