Three-Dimensional Reconstruction and Visualization of Human Enamel Ex Vivo Using High-Frequency Ultrasound
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Dental decay and erosion are common cases in clinics. It would be useful for dentists to collect adequate information about the thickness of hard tissue (e.g., enamel and dentin) during treatment without pulp exposure. This study proposes a scanning system that collects structural information of the tooth surface and enamel-dentine junction. A three-dimensional (3D) motorized scanning stage is used to control the movement trajectories of an A-mode transducer to acquire echoes from the surface of a tooth. The 3D form of enamel is reconstructed using this system. By adopting a gain compensation method for radio-frequency signals, no special preparation is required before scanning. Despite some discontinuous areas in the 3D images, the 3D representations of human molars well duplicated the real samples and the thickness of enamel could be measured. Based on micro-computed tomography data, the overall measurement error of the proposed system is 3.55%, indicating good performance for clinical application.
KeywordsHuman tooth Enamel thickness Three-dimensional (3D) reconstruction High-frequency ultrasound Mechanical scanning
This work was supported by National Natural Science Foundation of China (Grants 61271314, 61372007, 61401286 and 61571193), Guangdong Provincial Natural Science Foundation (Grant S2012010009885), International Cooperation Project of Science and Technology of Guangdong Province (Grant 2014A050503020), Guangzhou Key Lab of Body Data Science (Grant 201605030011), and National Engineering Technology Research Center for Mobile Ultrasonic Detection (Grant 2013FU125X02).
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