Yonsei University · 歯学
Professor Sang‐Sun Han's research lab specializes in advanced dental imaging and clinical applications, focusing on anatomical variations in the maxillofacial region, particularly retromolar canals and the trigeminal nerve's terminal branch complex (TCC), using cone-beam computed tomography (CBCT) for precise diagnosis. The lab investigates image quality optimization in CBCT scans under varying patient positioning and exposure conditions, aiming to improve diagnostic accuracy. Additionally, the lab explores innovative training methods using virtual reality to enhance spatial cognition and navigation skills in individuals with visual impairments, particularly in wayfinding and obstacle recognition. The integration of medical imaging, surgical planning, and assistive technology defines the lab’s interdisciplinary approach to improving clinical outcomes and patient safety.
Figures are computed from collected data and may differ slightly.
A retromolar canal is an anatomical variation in the mandible. As it includes the neurovascular bundle, local anesthetic insufficiency can occur, and an injury of the retromolar canal during dental surgery in the mandible may result in excessive bleeding, paresthesia, and traumatic neuroma. Using imaging analysis software, we evaluated the cone-beam computed tomography (CT) images of two Korean patients who presented with retromolar canals. Retromolar canals were detectable on the sagittal and c
A patient's position changes in every CBCT scan despite patient alignment protocols. However, there have been studies to determine image quality differences when an object is located at the center of the field of view (FOV). To evaluate changes in the image quality of the CBCT scan according to different object positions, the image quality indexes of the Alphard 3030 (Alphard Roentgen Ind., Ltd., Kyoto, Japan) and the Rayscan Symphony (RAY Ind., Ltd., Suwon, Korea) were measured using the Quart
There are virtual reality (VR) wayfinding training systems for people with visual impairment, but there is a lack of studies about how training environments can affect spatial information acquisition of people with visual impairment. Using a VR treadmill and a VR tracker, we studied how walk-in-place and actual walking can affect the acquisition of spatial information with regard to paths and obstacles. Our results show that people with visual impairment remember routes better when trained with
Miniscrew-root distance increased significantly with the increased insertion angle, and the amount of increase was affected by the miniscrew placement site and vertical facial type. To ensure adequate distalization of the posterior segment, the miniscrew should be inserted at an angle in the interradicular area between the second premolar and first molar.
Precise knowledge of the TCC is clinically important for suitable local anaesthetic nerve block and the planning of surgical procedures that involve the mandibular ramus. Three-dimensional images of CBCT data are particularly effective for confirming the presence of this variation.
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