49 results about "Premolar tooth" patented technology

A device for therapeutic includes a rigid screen (1) that is insertable behind the upper and lower lips of a user's mouth, the screen having a compound curvature and in a horizontal plane generally U-shaped profile, and in a vertical plane a convexo-concave cross-sectional profile that is gradually flattening from a central mid region towards the left and right ends (12, 13) thereof, the ends extended to reach at least past the premolar teeth on each side in the upper and lower jaws of the user when applied. A handle is attached to extend forward from a central mid region in the convex front face of the screen, the handle including a rigid stem (2) projecting from the front face at a neutral angle with respect to upper (5) and lower (6) halves of the screen (1), diverging from the stem in the vertical view.

The invention discloses a front traction mouth device and a manufacturing method thereof, comprising: a pair of retaining components, each retaining component includes a retaining crown, a traction hook and a connecting rod, and the retaining crown is used to wrap one side of the mouth For the first premolar, second premolar and first molar, the traction hook is set on the buccal side of the retaining crown, and the connecting rod is set on the lingual side of the retaining crown; the hyperbolic reed, one end of which is connected to the On the connecting rod, the other end is used to abut against the lingual side of the incisor in the mouth; the screw expander, the two ends of the screw expander are respectively connected to the connecting rod of a retention component. This solution is more conducive to the stability of wearing the device in the front traction mouth. During the front traction, it can expand the arch and solve the crowding of the anterior teeth in combination with clinical needs, and improve the efficiency of orthodontic treatment.

The invention discloses a method for determining a container model of a single tooth, in particular to a method for determining a container model based on tooth surface characteristics and a local three-dimensional right angle coordinate system, which mainly comprises the following steps: based on a segmentation tooth digital model, reflecting the curve degree at the peak by utilizing complex collection of a triangular facet and a discrete Gaussian curvature, collecting surface feature points of a single tooth; based on the surface feature points of the single tooth, establishing corresponding local three-dimensional right angle coordinates for incisor teeth, cuspid teeth, premolar teeth, and odontoprisis; and respectively establishing the container models of the incisor teeth, the premolar teeth, the odontoprisis and the cuspid teeth by using extreme values of the single tooth model under the three-dimensional right angle coordinate system. The invention has the advantages of novel and reasonable design, convenient implementation, high operating speed, high data processing accuracy and good implementation effect, can extract characteristic points of teeth and facilitate the operation on teeth, and can be used in the tooth correcting system.

The invention discloses a device for periodontal ligament distraction and osteogenesis to mesially move molars, which comprises a first belt ring set on molars or premolars mesial to the edentulous area and a second belt set on molars to be mesially moved The ring, the first belt loop and the second belt loop are connected by a helical distractor, and the helical distractor is arranged on the buccal side of the teeth, and the helical distractor includes a first buccal slider, a helical rod , a nut, a second buccal slider and a buccal slider; it also includes a first lingual slider and a second lingual slider arranged on the lingual side; the first lingual slider and the second lingual slider The side sliders are connected by a lingual side slider bar and an elastic device. The invention solves the problem in the prior art that the molars are deflected and tilted when the molars are moved mesially over a long distance.

The invention relates to an orthodontic self-locking bracket system with open auxiliary grooves, comprising a plurality of brackets, the brackets are provided with inner main grooves and auxiliary grooves, and an elastic The baffle plate and the bracket are provided with the first bracket, the second bracket and the third bracket, and the two ends of the elastic baffle of the first bracket are flush with the two side walls of the first bracket; One end of the elastic baffle is flush with the side wall of the second bracket, and the other end forms a unilateral gap with the side wall of the second bracket; the two ends of the elastic baffle of the third bracket are symmetrically arranged with double side notch. In the present invention, the first bracket is installed on the incisors, the second bracket is installed on the canines, and the third bracket is installed on the premolars, and the elastic baffles of the first bracket, the second bracket and the third bracket are cleverly used Set, so that the arch wire of the bracket system produces different correction forces at the positions corresponding to different brackets.

The invention provides an underjaw premolar teeth residual root traction device, and relates to the field of orthodontic instruments. The device uses first molar teeth and second molar teeth at the same side as anchorage teeth and comprises two platy bottom plates, a steel wire, a buccal tube, an Niti wire, a thrust spring and a tongue side button; two opposite side surfaces of the platy bottom plates are connected by the steel wire; the buccal tube is arranged on the steel wire; an included angle between the side wall, parallel with the bottom plates, of the inner wall of the cavity of the buccal tube and a sagittal surface is 30-45 degrees; an included angle between the side wall vertical to the bottom plates and a crown-shaped surface is 45-90 degrees; the inlet end of the buccal tube faces an occlusion direction and the outlet end faces a root direction; one end of the Niti wire is connected with the tongue side button, the other end of the Niti wire penetrates through the buccal tube and is bent backwards, the thrust spring sleeves outside the Niti wire between the inlet end of the buccal tube and the tongue side button, the Niti wire is in a stretching state; the thrust spring is in a compressed state. The traction device can provide continuous correction force, effectively draws a residual root to the occlusion direction and is favorable for the recovery treatment of a post crown.

The invention discloses an application of a fibrous strip for preparing a pulp-perforation cracked molar repairing body. A crack of a pulp-perforation cracked molar is located at a dental crown occlusion face along a developmental groove in a mesial and distal direction and is parallel to a tooth long axis. The depth of the crack is 1.0 mm from the pulp perforation position to the cemento-enamel junction in a root direction, and the width of the crack is 0.01-0.10 mm, and the thickness of the fibrous strip is 1.0-1.5 mm, and the width is 2.0-3.0 mm. The fibrous strip is located at a dental crown occlusion face in a direction vertical to the crack, or the fibrous strip is located in a medullary space to form rectangular laying, or the fibrous strip is located in a medullary space to form annular laying. The thickness of the fibrous strip is 1.0-1.5 mm, and the width is 2.0-3.0 mm. The fibrous strip is added in a resin repairing body, can improve stress concentration on the tip of the pulp-perforation tooth crack from a maxillary first premolar in a mesial and distal direction, and can efficiently prevent further development of a full crown lower crack. An excellent effect is obtained by performing annular laying of the fibrous strip in a direction vertical to the crack level in a medullary space.