Lecture Description
Introduction : To establish a treatment plan for orthodontic treatment and orthognathic surgery, it is necessary to analyze cephalometric radiographs. Although bilateral landmarks such as porion or orbitale were very important reference points setting the FH plane, they overlapped each other, so accurate detection could not be achieved. This was one of the causes of the difference in the analysis results for each investigator. In addition, when analyzing facial asymmetry through PA cephalometric radiographs, we mainly depended only on the direction of menton deviation and the distance away from the midsagittal plane. In this way, it is difficult to diagnose the three-dimensional stereoscopic asymmetry of the mandible. Recently, CBCT has been popularized and analysis using 3D reconstructed images is possible. However, without anatomical expertise, the measurement itself is very difficult, and it takes more time and effort compared to the analysis of two-dimensional radiographs, so it is difficult to use in a private clinic.
Discussion : In this presentation, I would like to introduce CBCT automatic landmark detection technology. Also, I would like to introduce a new concept using a similarity index and tomographic similarity scan that can maximize facial symmetry during orthognathic surgery by mirroring both structures based on the newly proposed computed modified absolute midsagittal plane of the mandible.
Conclusion : This presentation demonstrates the potential of 3D automatic tracing, SI, and ToSS curves in orthodontic and surgical simulation software to improve the precision in the clinical decision-making process.
October 28-30, 2022 ¡¤ COEX, Seoul, Korea