摘要:
A method by which an orthodontic appliance is automatically designed and manufactured from digital lower jaw and tooth shape data of a patient provides for the scanning of the mouth of a patient to produce a three-dimensional digitized model of the shapes of the patient's teeth and their positions in the patient's mouth. The appliance is automatically designed according to the final design, which also can be interactively modified and approved by the orthodontist, with the computer recalculating the effects on the treatment as a result of the doctor's changes. Brackets are fabricated as an integrated set, either by cutting slots therein or by building the brackets in layers. Three-dimensional custom jigs are automatically made to exactly position the brackets on a patient's teeth.
摘要:
A stopper rod comprises a body (11) having a central passageway (12) with part of a carrier rod (13) fixed in the passageway and a further part outside of the passageway for attachment to a lifting device. An enlarged part of the passageway defines a sealing surface (14) and an insert (16) around the carrier rod is partly received in the enlarged part. Retention means (17, 18) are carried on the carrier rod and expandable means are disposed around the carrier rod between the insert (16) and the retention means (17, 18). The expandable means include an expandable graphitic composition formed by removing a proportion of interstitial water from an expandable graphite formulation. The insert has a co-efficient of thermal expansion no greater than that of the carrier rod, whilst expansion of the expandable means is greater than that of the carrier rod.
摘要:
A system and method by which an orthodontic appliance is automatically designed and manufactured from digital lower jaw and tooth shape data of a patient provides for preferably scanning a model of the patient's mouth to produce two or three dimensional images and digitizing contours and selected points. A computer is programmed to construct archforms and calculate finish positions of the teeth, then to design an appliance, preferably including archwires and brackets, to move the teeth to the calculated positions. The lower teeth are positioned at their roots on an arch defined by the lower jaw bone, and the arch is modified to best fit the tooth tips on a smooth curve. Upper archforms are constructed for the upper teeth. Then, machine code is generated and appliances are automatically produced that will straighten the teeth of the patient. Custom placement jigs are also automatically designed and fabricated and are provided with the custom appliance to position the appliance on the patient's teeth.
摘要:
An orthodontic bracket, preferably in the form of a buccal tube, is provided for connecting an orthodontic archwire to each mandibular first molar of a patient. The bracket has an archwire groove oriented to maintain the archwire at a positive rotation angle relative to the point on the surface of the molar at which the bracket is connected. The rotation angle is preferably approximately 2.degree. for Caucasian patients and approximately 4.degree. for Asian patients. The groove, while inclined to a positive (distal) rotation angle of greater than zero, may additionally be inclined mesially relative to the wire to account for smaller cross-sectional dimensions of the wire relative to the groove. In making a custom orthodontic appliance, a computer designs such buccal tubes with the grooves rotated to an angle optimally calculated for the patient. In the custom method, based on digitized tooth shape date for the patient, the embrasure of the upper first molars are placed perpendicular to an archform to occupy the least space on the arch, and the mesial buccal cusp and disto lingual cusp of each lower first molar is placed on a line coinciding with a line through the mesial marginal ridge and disto lingual groove of the upper first molar.
摘要:
Coordinated orthodontic archwires are provided based on a method of designing custom orthodontic appliances based in individual patient anatomy and, based on a plurality of such custom designs, designing and manufacturing a standardized appliance for patients of average dental anatomy. From such method, a relationship is established for coordinating one archwire to another of any given design. The coordinated archwires so provided include an upper archwire that is an expansion of a lower archwire, and in addition, when the shapes of the archwires are superimposed, are spaced apart more in the vicinity of the cuspids and first bicuspids than in the vicinity of the incisors and, preferably, also the second bicuspids. The spacing difference is at least 0.005 inches, particularly for an appliance with low profile brackets, and is up to 0.025 or 0.035 inches for an appliance with the more conventional brackets. The spacings are determined as a function of the length of the wire from the midline of the wire.
摘要:
A method by which an orthodontic appliance is automatically designed and manufactured from digital lower jaw and tooth shape data of a patient provides for the scanning of the mouth of a patient to produce a three-dimensional digitized model of the shapes of the patient's teeth and their positions in the patient's mouth. The appliance is automatically designed according to the final design, which also can be interactively modified and approved by the orthodontist, with the computer recalculating the effects on the treatment as a result of the doctor's changes. Brackets are fabricated as an integrated set, either by cutting slots therein or by building the brackets in layers. Three-dimensional custom jigs are automatically made to exactly position the brackets on a patient's teeth.
摘要:
An orthodontic appliance is automatically designed and manufactured from digital lower jaw and tooth shape data of a patient. A computer calculates the post-treatment positions of the teeth and produces three-dimensional images of the teeth, individually and in their calculated positions. The appliance is automatically designed according to the final design, which also can be interactively modified and approved by the orthodontist, with the computer recalculating the effects on the treatment as a result of the doctor's changes. Brackets are fabricated as an integrated set, either by cutting slots therein or by building the brackets in layers by, for example, stereo lithography. Three-dimensional custom jigs are automatically made to exactly position the brackets on a patient's teeth.
摘要:
Stopper rod having an elongated body of refractory material, a passageway extending longitudinally in the body from an end thereof which is uppermost in use, a carrier rod having a part fixedly received in the passageway and a further part outside of the passageway for attachment to a lifting device for the stopper rod. The passageway has an enlarged part which defines a sealing surface spaced from the end of the body, an insert around the carrier rod having at least a part thereof received in the enlarged part, a retention element on the carrier rod, and an expandable element disposed between the insert and the retention element. The material of the insert has a co-efficient of thermal expansion no greater than that of the carrier rod. Expansion of the expandable element, in use, is greater than that of the carrier rod.
摘要:
A computerized method of designing custom orthodontic appliances based on the individual anatomy of the individual patient is used in a further method of statistically processing the appliance design parameters to produce standardized appliances, particularly orthodontic brackets, for patient groups or classes of patients that share certain features of dental anatomy, common treatment problems or similar preferred treatment goals. Standardized brackets are provided in various combinations for patients of racial or other anthropological groups, including bracket combinations and bracket sets for Asian patients and for Caucasian patients. Methods for treating patients and providing group specific appliances to patients are also provided.
摘要:
A custom orthodontic appliance, preferably including an archwire, is automatically formed into an arcuate shape optimized to the anatomy of the patient to move the teeth to desired finish positions on a desired dental archform. Data, digitized of anatomical shapes, preferably of individual teeth and the lower jaw bone, is processed with data of the desired tooth positions and archform, which are preferably calculated from the digitized anatomical shape data, to design an optimized arcuate appliance. Preferably, an archwire is automatically designed along with optimized custom brackets to minimize bracket profiles and the changes in curvature of the wire, which is preferably in the form of a series of circle segments, embodied in machine control instructions carried by a control signal to a numerically controlled wire feeding and bending machine.