Investigation of dental samples using a 35 MHz focussed ultrasound piezocomposite transducer
Investigation of dental samples using a 35 MHz focussed ultrasound piezocomposite transducer
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DOI：
10.1016/j.ultras.2008.08.007
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发表时间：
2009-02-01
期刊：
影响因子：
4.2
通讯作者：
Cochran, S.
中科院分区：
文献类型：
--
作者：
Hughes, D. A.;Girkin, J. M.;Cochran, S.
牙齿侵蚀和蛀牙日益普遍，但至今没有定量监测工具。这种工具将允许早期诊断和治疗，并最终预防更严重的疾病和疼痛。尽管超声在40多年前就被证明是一种探测牙齿内部结构的方法，但临床工具的发展一直很缓慢。本研究报告的目的是研究一种新型高频超声换能器的使用，并利用一种已知的牙科技术对其进行验证。对一颗因临床原因拔出的牙齿进行切片，以提供含有牙釉质和牙本质层的样本，使牙釉质-牙本质交界处（EDJ）具有不同的深度。然后将样品浸入水中，使用定制设计的中心频率为35 MHz、-6 dB带宽为24 MHz的压电复合超声换能器记录b扫描。换能器的轴向分辨率为180 μ m，空间分辨率为110 μ m，与以前使用较低频率的工作相比，这是一个重大进步。根据得到的数据集测量EDJ的深度，并与顺序磨削和成像（SGI）方法的测量结果进行比较。b超显示脑电结深度变化。随后，EDJ测量值与SGI测量值的相关性为0.89 （p < 0.01）。结果表明，高频超声能够测量牙釉质厚度，准确度在牙釉质总厚度的10%以内，而目前尚无临床工具可用于测量牙釉质厚度。(C) 2008 Elsevier B.V.版权所有
Dental erosion and decay are increasingly prevalent but as yet there is no quantitative monitoring tool. Such a tool would allow earlier diagnosis and treatment and ultimately the prevention of more serious disease and pain. Despite ultrasound having been demonstrated as a method of probing the internal structures of teeth more than 40 years ago, development of a clinical tool has been slow. The aim of the study reported here was to investigate the use of a novel high frequency ultrasound transducer and validate it using a known dental technique.A tooth extracted for clinical reasons was sectioned to provide a sample that contained an enamel and dentine layer such that the enamel-dentine junction (EDJ) was of a varying depth.The sample was then submerged in water and a B-scan recorded using a custom-designed piezocomposite ultrasound transducer with a centre frequency of 35 MHz and a -6 dB bandwidth of 24 MHz.The transducer has an axial resolution of 180 mu m and a spatial resolution of 110 mu m, a significant advance on previous work using lower frequencies. The depth of the EDJ was measured from the resulting data set and compared to measurements from the sequential grinding and imaging (SGI) method.The B-scan showed that the EDJ was of varying depth. Subsequently, the EDJ measurements were found to have a correlation of 0.89 (p < 0.01) against the SGI measurements. The results indicate that high frequency ultrasound is capable of measuring enamel thickness to an accuracy of within 10% of the total enamel thickness, whereas currently there is no clinical tool available to measure enamel thickness. (C) 2008 Elsevier B.V. All rights reserved.