Yonsei University · Dentistry
Professor Jung-Yul Cha's research lab specializes in digital orthodontics, implant biomechanics, and advanced dental materials. The lab focuses on optimizing clinical outcomes through computer-aided design and manufacturing (CAD/CAM) technologies, including customized brackets, clear aligners, and miniscrew implants. Key research directions include evaluating the mechanical behavior of dental implants under varying insertion torques, assessing the accuracy and translucency of 3D-printed and thermoformed aligners, and improving the stability and biocompatibility of orthodontic appliances.
Figures are computed from collected data and may differ slightly.
Implants placed with high insertion torque (IT) typically exhibit primary stability, which enables early loading. Whether high IT has a negative impact on peri-implant bone health, however, remains to be determined. The purpose of this study was to ascertain how peri-implant bone responds to strains and stresses created when implants are placed with low and high IT. Titanium micro-implants were inserted into murine femurs with low and high IT using torque values that were scaled to approximate t
PCA-S showed minimal FR among the ceramic brackets, and was comparable to the conventional SS bracket. The silica layer and rounded edges of the ceramic slot lowered FR considerably.
The present study compared the thickness and gap width of thermoformed and 3D-printed clear aligners (CAs) using micro-computed tomography (micro-CT) and evaluated their translucency using spectrophotometer. Four groups of CAs were tested: thermoformed with polyethylene terephthalate glycol (TS) or copolyester-elastomer combination (TM), and 3D-printed TC-85 cleaned with alcohol (PA) or with centrifuge (PC). CIELab coordinates were measured (n = 10) to evaluate translucency. CAs (n = 10) were fi
In this dog model, the tapered miniscrew design increased initial stability until 3 weeks of loading but had no additional effect on the secondary stability (ie, after 12 weeks of loading) versus a cylindric miniscrew design.
Based on three-dimensional scanning and computer-aided design and computer-aided manufacturing (CAD/CAM) techniques, customized bracket systems are increasingly used. However, data remain limited regarding customized bracket design, characteristics, and stability. This study was undertaken to evaluate the design, bond strength, and residual adhesives of four different CAD/CAM customized brackets that were attached to human tooth specimens by indirect bonding. Thirty extracted human upper premola
Digital models can be used for measuring crowding in both mild and severe crowding cases. However, crowding measured by digital models tends to be lesser than that measured by cast models, and this should be considered during clinical application.
Histologic and microCT analysis showed that immediate loading of mini-implants in the dog model is possible for orthodontic applications with a high bone-implant contact and 100% survival rate.
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