Implant surgery guiding method

An implant surgery guiding method, comprising:

• (a) generating a 3D oral cavity image of a patient by combining a CT image of an oral cavity including a jawbone of the patient and a gypsum model image of an oral gypsum model placed on a cradle having a predetermined shape and size;
• (b) designing a target placement including a target position and a target orientation of a fixture based on the 3D oral cavity image;
• (c) placing the oral gypsum model on the cradle attached with a first auxiliary marker at a predetermined position, attaching an oral marker that is to be attached to the jawbone of the patient on the oral gypsum model, taking a photograph of the oral gypsum model attached with the first auxiliary marker and the oral marker, and determining a spatial relationship between the oral marker and the jawbone in the 3D oral cavity image by using a spatial relationship between the oral marker and the first auxiliary marker, a spatial relationship between the first auxiliary marker and the cradle, and a spatial relationship between the cradle and the jawbone in the 3D oral cavity image;
• (d) attaching the oral marker to the jawbone of the patient, determining the spatial relationship between the oral marker and the jawbone in the 3D oral cavity image as the spatial relationship between the oral marker and the jawbone, attaching a handpiece marker on a handpiece of a dentist, and determining a spatial relationship between the handpiece marker and the handpiece;
• and
• (e) estimating positions and orientations of the jawbone and the handpiece based on changes in positions and orientations of the oral marker and the handpiece marker while tracking the motions of the oral marker and the handpiece marker, and displaying a jawbone image portion and a handpiece image portion on a screen reflecting real-time changes in the positions and orientations of the jawbone and the handpiece.