A dental appliance may include a first plurality of tooth receiving cavities for anterior teeth and a first plurality of attachment receiving cavities shaped to impart a first plurality of forces and a first counter moment to the anterior teeth, the first plurality of forces being to direct at least one tooth in a posterior direction. The dental appliance may include a second plurality of tooth receiving cavities for posterior teeth and a second plurality of attachment receiving cavities to impart a second plurality of forces and a second counter moment the posterior teeth, the second counter moment being in a direction opposing the first counter moment. At least a portion of the second plurality of forces may be configured to oppose the first plurality of forces. The first counter moment and the second counter moment may be configured to be coupled to form a differential moment.

A dental appliance may include a first plurality of tooth receiving cavities for anterior teeth and a first plurality of attachment receiving cavities shaped to impart a first plurality of forces and a first counter moment to the anterior teeth, the first plurality of forces being to direct at least one tooth in a posterior direction. The dental appliance may include a second plurality of tooth receiving cavities for posterior teeth and a second plurality of attachment receiving cavities to impart a second plurality of forces and a second counter moment the posterior teeth, the second counter moment being in a direction opposing the first counter moment. At least a portion of the second plurality of forces may be configured to oppose the first plurality of forces. The first counter moment and the second counter moment may be configured to be coupled to form a differential moment.

A mandibular positioning facial retrognathism orthodontic system and a design method thereof are disclosed. The orthodontic system includes a maxillary shell-like dental appliance having a shell-like body, a protrusion portion protruding toward an opposite jaw is disposed at a posterior area corresponding to the shell-like body, a traction portion is disposed at a labial side of the shell-like body, and a retaining portion configured for fastening with a retaining attachment is disposed at the posterior area corresponding to the shell-like body. The protrusion portion is engaged with the posterior area of a mandibular for occlusal reconstruction, so that mandibular incisors are aligned with maxillary incisors. The design method is a design method for the mandibular positioning facial retrognathism orthodontic system, which can provide a treatment-specific orthodontic system, thereby achieving treatment of mandibular positioning facial retrognathism.

A mandibular positioning facial retrognathism orthodontic system and a design method thereof are disclosed. The orthodontic system includes a maxillary shell-like dental appliance having a shell-like body, a protrusion portion protruding toward an opposite jaw is disposed at a posterior area corresponding to the shell-like body, a traction portion is disposed at a labial side of the shell-like body, and a retaining portion configured for fastening with a retaining attachment is disposed at the posterior area corresponding to the shell-like body. The protrusion portion is engaged with the posterior area of a mandibular for occlusal reconstruction, so that mandibular incisors are aligned with maxillary incisors. The design method is a design method for the mandibular positioning facial retrognathism orthodontic system, which can provide a treatment-specific orthodontic system, thereby achieving treatment of mandibular positioning facial retrognathism.

An extraoral orthopedic device (I) for the direct protraction of the maxilla and indirect protraction of the mandible, comprising: an ellipsoidal wreath (II) placed and supported on the neurocranium (IX) by means of its tightening mechanism (11.1-4), a fixation strap (VII) and a belt (VIII), a width-adjustable, removable and reusable aluminum horizontal girder (IV), which is coupled, through the elastic bands (V), with an intraoral mechanism (VI) and two removable and reusable aluminum perpendicular girders (III), which couple the above-mentioned ellipsoidal wreath (II) with the said horizontal girder (IV), whereinsaid ellipsoidal wreath (II), individually designed using a computer, comprises first means of adjustment and support (11.5) in order to ensure the optimal placement of the two said perpendicular girders (III) and first means of support (11.9) aiming at its fixation to the neurocranium (IX) by means of a strap (VII), the above-mentioned perpendicular girders (III) comprise second means of adjustment and support aiming at the easy and symmetric placement of the said horizontal girder (IV), thus ensuring optimal direction and tension of the elastic bands (V) individualized to each patient.

An extraoral orthopedic device (I) for the direct protraction of the maxilla and indirect protraction of the mandible, comprising: an ellipsoidal wreath (II) placed and supported on the neurocranium (IX) by means of its tightening mechanism (11.1-4), a fixation strap (VII) and a belt (VIII), a width-adjustable, removable and reusable aluminum horizontal girder (IV), which is coupled, through the elastic bands (V), with an intraoral mechanism (VI) and two removable and reusable aluminum perpendicular girders (III), which couple the above-mentioned ellipsoidal wreath (II) with the said horizontal girder (IV), whereinsaid ellipsoidal wreath (II), individually designed using a computer, comprises first means of adjustment and support (11.5) in order to ensure the optimal placement of the two said perpendicular girders (III) and first means of support (11.9) aiming at its fixation to the neurocranium (IX) by means of a strap (VII), the above-mentioned perpendicular girders (III) comprise second means of adjustment and support aiming at the easy and symmetric placement of the said horizontal girder (IV), thus ensuring optimal direction and tension of the elastic bands (V) individualized to each patient.

A maxilla holder includes a base plate and a connecting member. One end of the connecting member is connected with the base plate which extends along a pre-designed occlusal plane while the other end of the connecting member includes at least two supporting portions. With the supporting portions abutting against the cranium, the base plate is positioned so that the maxilla is located in a pre-planned position once it is moved onto the base plate.

A maxilla holder includes a base plate and a connecting member. One end of the connecting member is connected with the base plate which extends along a pre-designed occlusal plane while the other end of the connecting member includes at least two supporting portions. With the supporting portions abutting against the cranium, the base plate is positioned so that the maxilla is located in a pre-planned position once it is moved onto the base plate.

A jaw position correcting apparatus includes an orthotic device, a tractor, and orthotic helmet, wherein the tractor includes a pulled part and a helmet fixing part and the orthotic helmet includes a first covering part that covers a frontal region and left and right temporal regions of the head, a second covering part that covers an occipital region of the head, a pair of extending parts that extend downward from portions of the first covering part, a pair of third covering parts that extend forward from the extending parts along zygomatic arches, and a first fixing part provided on the first covering part and fixing the helmet fixing part and the pulled part includes a first locking part urged forward by a first elastic member, a second locking part urged upward by a second elastic member, and a third locking part urged upward by a third elastic member.

A jaw position correcting apparatus includes an orthotic device, a tractor, and orthotic helmet, wherein the tractor includes a pulled part and a helmet fixing part and the orthotic helmet includes a first covering part that covers a frontal region and left and right temporal regions of the head, a second covering part that covers an occipital region of the head, a pair of extending parts that extend downward from portions of the first covering part, a pair of third covering parts that extend forward from the extending parts along zygomatic arches, and a first fixing part provided on the first covering part and fixing the helmet fixing part and the pulled part includes a first locking part urged forward by a first elastic member, a second locking part urged upward by a second elastic member, and a third locking part urged upward by a third elastic member.