Abstract: A method of determining an amount of insertion of a probe into a root canal of a tooth using an MRI device. The probe, which is made from magnetic material, is inserted into the root canal, which may be filled with dental pulp. Then, the probe and the root canal are imaged using an MRI device so as to determine the amount of insertion of the probe into the root canal.

Abstract: The present invention relates to a method and an apparatus for determining the shape of a tooth, a prosthesis, a jaw bone, or an implant structure with an Magnetic Resonance Imaging device. However, since these items lack a substantial number of protons, electrons, or molecules which can be detected by an Magnetic Resonance Imaging device, these items are supplied with an Magnetic Resonance Imaging contrast medium which is rich in such protons, electrons, or molecules. Therefore, once the Magnetic Resonance Imaging contrast medium is supplied to the tooth, prosthesis, jaw bone, or implant structure, the Magnetic Resonance Imaging device can measure the items by measuring the Magnetic Resonance Imaging contrast medium surrounding the items. Furthermore, an electrical circuit may be provided which can determine the shape of the tooth, prothesis, jaw bone, or implant structure based on the measurements of the Magnetic Resonance Imaging device.

Abstract: In a measuring technique used to restore a tooth with an employment of an implant structure, it is desirable to precisely determine the direction and position of bonding points in which a prosthesis is attached to the implant structure at the time of curing the tooth by of the implant structure. Upon precisely measuring the direction and position of bonding points in which a prosthesis is attached to the implant structure, measurement points are provided with the bonding points, and are taken a picture by a camera. In the picture thus taken, shape and position of the measurement points are measured by an image processor device by way of illustration so as to measure the positional relationship of the bonding points of the implant structure which is embedded in a human jaw.