Tooth extraction difficulty diagnosis and complications prediction device and method

A tooth image-based tooth extraction difficulty diagnosis and complications prediction device, comprising:

• a region of interest setting unit configured to set a region of interest including a third molar and a periodontal region by:
• resizing a panoramic radiological image to a resolution of 1056×512 pixels,
• applying contrast limited adaptive histogram equalization (CLAHE) to the resized image,
• detecting a lower third molar of the lower jaw in the panoramic radiological image by using a RetinaNet detection model having a ResNet-152 backbone,
• obtaining a bounding box of the lower third molar from the detection model,
• cropping the panoramic radiological image to 700×700 pixels based on the bounding box such that a cropped image includes the lower third molar, teeth adjacent to the lower third molar, and an inferior alveolar nerve (IAN) canal, and
• setting the cropped image as the region of interest;
• a parameter calculation unit configured to calculate, based on image information within the region of interest, a set of parameters that comprises an impaction depth of the third molar, a distance between the third molar and a lower jawbone, an angle of the third molar, and a degree of invasion between the third molar and the IAN;
• a tooth extraction difficulty evaluation unit configured to classify a tooth extraction difficulty of the third molar into one of Vertical Eruption (VE), Soft Tissue Impaction (STI), Partial Bony Impaction (PBI), and Complete Bony Impaction (CBI) by using a hybrid vision transformer model R50+ViT-L/32 as a classifier based on the impaction depth of the third molar, the distance between the third molar and the lower jawbone, and the angle of the third molar;
• and
• a complications prediction unit configured to classify a likelihood of IAN damage into three classes N1, N2, and N3 by using the hybrid vision transformer model R50+ViT-L/32 as a classifier based on the degree of invasion between the third molar and the IAN,
• wherein N1 indicates that the lower third molar does not reach an IAN canal in a panoramic radiographic image, N2 indicates that the lower third molar invades one IAN canal line in the panoramic radiographic image, and N3 indicates that the lower third molar invades two IAN canal lines in the panoramic radiographic image.