Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Optical Coherence Tomography Applications for Dental Diagnostic Imaging: Prototype System Performance and Preclinical Trial

  • Eun Seo Choi (Department of Physics, Chosun University) ;
  • Won-Jin Yi (Dental Research Institute, Seoul National University School of Dentistry) ;
  • Chang-Seok Kim (Department of Cogno-Mechatronics Engineering, Pusan National University) ;
  • Woosub Song (Medical Photonics Research Center, Korea Photonics Technology Institute) ;
  • Byeong-il Lee (Department of Smart Healthcare, Pukyong National University)
  • Received : 2023.04.06
  • Accepted : 2023.05.04
  • Published : 2023.06.25
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Abstract

An intraoral spectral domain optical coherence tomography (SD-OCT) system has been developed, using a custom-built hand-held scanner and spectrometer. The hand-held OCT probe, based on a microelectromechanical systems scanner and a self-built miniaturized drive circuit, had a field of view sufficient for dental diagnosis. The spectrometer using a fabricated f-theta lens provided the image depth required for dental diagnosis. The axial and transverse resolutions of the OCT system in air were 7.5 ㎛ and 12 ㎛ respectively. The hand-held probe could scan an area of 10 × 10 mm2, and the spectrometer could image along a depth of 2.5 mm. To verify the utility of the developed OCT system, OCT images of tooth hard and soft tissues were acquired, and a user-interface program for diagnosis was developed. Early caries and microcracks that were difficult to diagnose with existing methods could be found, and the state of restoration could be observed. Measuring the depth of the gingival sulcus, distinguishing subgingival calculus, and detecting an implant under the gingiva suggested the possibility of the SD-OCT system as a diagnostic for dental soft tissues. Through the presented OCT images, the capability of the developed SD-OCT system for dental diagnosis was demonstrated.

Keywords

Acknowledgement

We thank WINUS Technology Co., Ltd. for developing and manufacturing the prototype of the dental OCT system.

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