Program
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Guest Speakers

James, Ying K. Tseng

James, Ying K. Tseng

Taiwan
  • Speech Topic
    • Dialogue Between Tradition & Innovation: Valuable Orthodontic Treatment
Chiung-Hua Huang

Chiung-Hua Huang

Taiwan
  • Speech Topic
    • TBD
Nien-Shan Yang

Nien-Shan Yang

Taiwan
  • Speech Topic
    • Shaping the Future Smile : Cracking the Code of Phase I Challenges and Advancing Phase II Planning in Growing Teen Patients
Johnny Liaw

Johnny Liaw

Taiwan
  • Speech Topic
    • Applications of the double J retractor and palatal TADs
More

Maxillary incisor torque control is critical during space closure, particularly in cases of severe protrusion with minimal crowding. This presentation introduces the design, biomechanics, and clinical applications of the Double-J retractor—a customized appliance supported by palatal miniscrews that enables controlled, bodily retraction of the maxillary incisors. The force system is designed to direct the retraction force vector through the center of resistance of the anterior segment, while auxiliary torquing springs guided by palatal miniscrews provide additional torque control. Cephalometric superimpositions from clinical cases demonstrate excellent anchorage preservation, torque control, and vertical control, especially when combined with a transpalatal arch and cantilever clips. A finite element analysis was also conducted to examine the optimal placement of miniscrews and the magnitude of activation. The biomechanical principles of the Double-J retractor closely resemble those of Dr. Burstone’s torquing arch, making it an effective option for managing high-angle Class II protrusion cases with upright incisors and bony protrusion. Furthermore, this system allows for esthetic retraction without fixed appliances and may be integrated with clear aligner therapy, offering versatility in complex treatment scenarios.

Eric Liou

Eric Liou

Taiwan
  • Speech Topic
    • TBD
Shih-Jaw Tsai

Shih-Jaw Tsai

Taiwan
  • Speech Topic
    • TBD
Hui-Chen Tsai

Hui-Chen Tsai

Taiwan
  • Speech Topic
    • Facilitating molar movement with periodontal surgery (molar impaction, molar distalization and molar intrusion)
Johnson Hsin-Chung Cheng

Johnson Hsin-Chung Cheng

Taiwan
  • Speech Topic
    • The Current Status and Future Prospects of Orthodontic Specialist Education in Taiwan