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Computer-aided "Tetris" genioplasty using an intermediate trimming guide for complex asymmetry correction
Nobuhide Ohashi1, Yuma Hashi2, Manabu Yamagishi2
1Division of Hygiene, Department of Social Medicine, Sapporo Medical University School of Medicine, Sapporo, Japan; Department of Oral Surgery, Sapporo Medical University School of Medicine, Sapporo, Japan.
Journal of Stomatology, Oral and Maxillofacial Surgery
|July 30, 2026
Summary
A new digital workflow using an Intermediate Trimming Guide (ITG) simplifies complex "Tetris genioplasty" by improving accuracy. This method enhances predictability for asymmetric genioplasty cases.
Area of Science:
- Oral and Maxillofacial Surgery
- Digital Dentistry
- Biomedical Engineering
Background:
- Computer-aided design and manufacturing (CAD/CAM) enhance genioplasty accuracy.
- Complex 3D movements in genioplasty, like
Purpose of the Study:
- To introduce a novel three-step digital workflow for precise genioplasty.
- To address the surgical challenges of complex 3D bone resections in
Main Methods:
- Development of a novel Intermediate Trimming Guide (ITG) for precise bony interference resection.
- Application of a three-step digital workflow in a case of asymmetric genioplasty.
- Utilisation of CT models for planning and postoperative assessment.
Main Results:
- The ITG facilitated accurate resection of bony interferences, converting visual estimation into a guided step.
- Sub-millimetre accuracy (RMSE < 1 mm) was achieved between planned and postoperative positions.
- Successful autologous bone recycling was demonstrated.
Conclusions:
- The novel digital workflow, including the ITG, simplifies complex bone trimming in genioplasty.
- This approach shows potential for more predictable outcomes in asymmetric genioplasty.
- The workflow demonstrated high accuracy in a preliminary case.
