Method for measuring three-dimensional movement of teeth in orthodontic process

Abstract

The invention discloses a method for measuring three-dimensional movement of teeth in the orthodontic process. The method comprises the following steps: overlapping a CBCT (cone beam computed tomography) tooth model at initial treatment and an intraoral scanning model, and constructing a complete tooth model; matching and overlapping the intraoral scanning model after a period of treatment with amodel at an initial moment, and performing comparison; performing analysis by isolating single teeth, and establishing a partial three-dimensional coordinate system of a target tooth; making three reference points in bracket positions of upper dental crowns of front and rear intraoral models; and calculating a spatial alternation matrix according to the coordinate of the reference points, and furthermore, calculating three-dimensional translation and rotation movement of the tooth, so as to obtain three-dimensional tooth movement. All teeth are analyzed by using the same method, and displacement of a whole tooth row is obtained. The intraoral scanning model of a patient is acquired for multiple times continuously, and continuous three-dimensional displacement of the whole tooth row in theorthodontic process can be measured.

Description

technical field [0001] The invention relates to a technique for monitoring and measuring three-dimensional movement of orthodontic teeth, belonging to the technical field of orthodontic treatment detection. Background technique [0002] Orthodontic treatment is to adjust the coordination between the dentition itself, the dentition and the jaw through orthodontic devices. The ultimate goal is to achieve balance, stability and aesthetics of the stomatognathic system. [0003] During the orthodontic process, timely detection and control of the position and movement of the patient's teeth is of great significance for the determination and adjustment of the treatment plan. However, only by observing the visible crown part often cannot reflect the position and shape of the whole tooth well. Therefore, before orthodontic treatment, doctors often perform CBCT scans on patients to observe the position of teeth (including roots). Since the CBCT scan has radiation to the patient, it...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the above problems and provide a method for measuring and evaluating the complex three-dimensional movement of teeth in the clinical orthodontic process. The digital operation is simple and does not require the patient to bear additional radiation, which solves the problem of traditional orthodontic treatment. Unable to grasp the displacement of the teeth (including the roots) in time, relying too much on observing the position of the crown and the doctor's experience to evaluate problems such as tooth movement

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