A device for measuring spee curve depth

Abstract

The invention discloses a Spee curve depth measuring device and belongs to the field of orthodontic medical apparatuses and instruments. The Spee curve depth measuring device is characterized by comprising a positioning device and a measuring device, wherein the measuring device is used for measuring the vertical distance from the lowest tooth cusp of the lower jaw Spee curve to a plane on which the positioning device is positioned; the positioning device comprises a primary positioning rod used for being positioned on the center line of lower arcus dentalis, and two measuring plates used for being respectively arranged just above the left and right lower arcus dentalis; a secondary positioning rod which can rotate is arranged at the front / rear end of each measuring plate; multiple measuring holes are formed in the measuring plates; the measuring plates are movably connected with the primary positioning rod by virtue of a connecting rod; and the measuring plates, the primary positioning rod and the secondary positioning rod are positioned on the same plane. The Spee curve depth measuring device disclosed by the invention is reasonable in design, simple in structure and convenient to use, and the Spee curve depth can be accurately measured.

Description

technical field [0001] The invention belongs to the field of orthodontic medical instruments, in particular to a device for measuring the Spee curve depth of oral and mandibular dentition. Background technique [0002] From the vertical position relationship characteristics of the tooth arrangement, it can be seen that the heights of the cusps of the upper and lower dentition (the lowest point of the mandibular arch) are not consistent, and the shape of the dentition also has a certain curvature. The curve is used to describe this dentition An important concept of morphological features. The curve in the sagittal direction is called the longitudinal curve. In the mandibular dentition in the oral cavity, a continuous concave upward line is formed by the incisor crest connecting the incisors, the cusps of the canines, the premolars and the buccal cusps of the molars The longitudinal curve is also called the Spee curve. The incisor segment of the normal dentition curve is relat...

AI Technical Summary

Problems solved by technology

[0003] At present, there is no special device to measure the Spee curve in clinical practice. The ruler is usually placed on the incisor of the lower incisor and the cusp of the last lower molar. Since the mandibular dental arch is bow-shaped, the ruler is long and straight, so the ruler cannot cover it. All the cusps of the lower jaw, especially the lowest "cusp" in the Spee curve (the lowest "cusp" can represent the lowest point of the Spee curve, and the lowest "cusp" is used below to express), so use the ruler method Measuring the distance from the lowest "cusp" of the mandibular dentition to the ruler will inevitably cause a large error due to the deviation of the line of sight, etc.

Moreover, the malocclusion dentition is often complex, such as left-right asymmetry of the dentition, deviation of the mandibular midline, high malocclusion canines, etc., which all affect the measurement of the depth of the Spee curve of the mandibular arch

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