Activator orthodontic appliance.ppt

The lower incisors are grasped labially 2 mm in acrylic in order to avoid their protrusion. The lingual surfaces remain free. The upper incisors are also grasped in acrylic. The position of the mandible is achieved through the long lingual wings of the lower base. The upper base plate is kept small. The palatal area of the upper anterior teeth is blocked out with wax in order to allow a retrusion.

The lateral bite plane reaches to the center of the occlusal surfaces. In the premolar region, the lower base is extended as far as possible downwards.

In combination with a high pull headgear, this appliance with bite block can be used to intrude the upper teeth. The Teuscher activator Elements: Headgear tubes, torque springs 0. Base appliance with four torque springs. The torque springs only contact the upper incisors in one point shortly underneath the gingival margin. It is bent away slightly to avoid contact with the rest of the clinical crown. The retention is in the interocclusal area.

The headgear tubes lie between both tooth rows in the area of the deciduous molars. The interocclusal area should be high enough to allow a good anchorage of the retentions of the headgear tubes in the acrylic.

It should also be checked from the occlusal point of view if they lie parallel to be able to insert the inner bow without any problems. The acrylic base has to cover one third of the lower incisors, and the upper incisors should be covered on the palatal side up to one half and on the labial side, only to the incisal edge. Modifications of the Teuscher activator a Torque springs on the central incisors The Teuscher activator allows the design of torque springs on the central incisors in combination with protrusion springs for labial movement on the lateral incisors.

Therefore the limit of the vestibule has to be erased before making the appliance. It has to be positioned in height of the gingival margin in front of the lower incisors in a distance of approximately 1 mm. The distalizing springs consist of a big loop in the molar region and have a distal cantilever mesial of the first molars and its retention in the incisal area. The coverage with wax should be done carefully. The characterizing feature of this appliance is the large vertical opening in the buccal sections which is determined by a construction bite.

In order to guide the anterior movement in the posterior region, a thin wax plane is added in the upper jaw and a high wax plane, higher than half of the vertical opening, is added in the lower jaw; the main purpose is to create plane surfaces for the acrylic platforms.

If the fixator is closed the separation between both wax planes in the buccal area should be of approximately one millimeter, so that the lateral bite plane presents enough stability. On the models the extension of the acrylic shield over the whole incisal area in the upper and lower jaw should be limited with a wax frame. The retention of the labial bow lies in the interocclusal acrylic right behind the upper incisors. The models prepared this way can be covered with acrylic and put into the pressure vessel for its polymerization.

In the finished appliance, for their proper activation, only the retention of the distalizing springs is covered with acrylic. The labial bow only contacts the upper incisors. The distal limitation of the appliance is the A-line. The labial shield covers the incisors over one third of their clinical crown. The lateral bite planes have no contact at all with the posterior teeth in order to achieve the desired vertical eruption.

The retention lies as in the class II appliance, in the anterior area of the vertical opening. Also, the distalizing spring is bent with a big loop in the molar region. Although in this appliance the distal cantilevers are located behind the first molars, the retention ends in the anterior palatal area. As before, the wax coverage is very important. The big vertical opening corresponds to the one in type-II.

In this case, a wax plane that reaches over the half of the vertical opening is added onto the upper jaw. In the lower jaw, the posterior teeth are slightly covered with wax and in the incisal area, from canine to canine, the wax is concavely shaped; the loop and the distal cantilever of the distalizing spring are also covered with wax.

For its proper stability, the acrylic in the interocclusal area should show a thickness of one millimeter. The acrylic shield of this appliance only covers the lower incisal area and is correspondingly framed with a wax limitation.

Despite its location, a sufficient anchorage has to be guaranteed for the retention of the labial bow. Before adding the acrylic both models have to be hydrated.

In this class III appliance, the distal limitation is also marked by the A-line. Once again, only the retention of the distalizing springs is grasped in acrylic. In the upper jaw, the labial bow does not contact but shields off the lip. The upper teeth only contact the acrylic shield.

The acrylic can be trimmed and shaped individually by the orthodontist. The lateral bite plane allows more vertical eruption for the upper posterior teeth. The activator according to Pfeiffer and Grobety Elements: Modified labial bow with soldered triangular clasp 0.

The impressions are filled with the bands in order to be able to adapt the finished appliance better. In the original appliance only a modified labial bow with a soldered triangular clasp is bent. The canine loops of the labial arch are placed as usual in the canine area. Then the wire is bent distally and between the first and second premolar it is bent into the retention.

The screw is fixed in the upper jaw and the base plate is limited with wax stripes. The activator additionally consists of lateral bite blocks and an incisal cap in the lower anterior region. The lower impression has to depict the lingual area very well in order to extend the lower lingual wings as far as possible into the sublingual area.

The lower wings of the activator should be very pronounced on the lingual side favoring the activity of the masticatory muscles. This is a lateral view of the activator with its pronounced lower wings. The activator with spring bows according to Schwarz Elements: Labial bow 0. A labial bow is bent for each upper and lower jaw and the single plates are finished with plane lateral bite blocks.

The polished and finished plates are set onto the models which were articulated according to the construction bite. Now the unifying spring bows can be bent and be added into the acrylic of the single plates of the activator. These spring bows are supposed to enhance muscle activity. The spring bows reach distally over the base plate for a proper activation.

Different directions for their activation are possible horizontal, vertical. The open bite activator with tongue crib Elements: Labial bow 0. Function: Intrusion of the posterior teeth, extrusion of the incisors and simultaneous protection of the tongue. Description: The tongue is kept from the teeth because of the tongue loop which follows the curve of the dental arch. The models are set into the fixator with the construction bite and the vertical opening is determined. The labial bows are bent as usual.

The connecting bow in the lower jaw and the Coffin spring in the upper jaw are fixed each 1 mm from the gingival tissue. The divided tongue crib is fixed parallel to the lingual or palatal area of the incisors. The tongue crib consists of two divided loops. The separation of the parallel wires corresponds to half of the area to be closed off. The loop is bent according to the curvature of the anterior segment.

Both wire ends are bent over for retention and are anchored in the lateral part of the activator. The second half is bent like a mirror image and is set on the other side.

The acrylic body of the open activator is designed quite delicately. The anterior open base and the adapted tongue crib make this a well accepted appliance by patients. The distally closed Coffin spring is located in the molar region. The lower incisors area is shaped with protrusion springs. The canines in the upper jaw are held with C-clasps. The acrylic base is reduced in its anterior part and has no interocclusal acrylic. The delicate design of the acrylic and the relative thin wire elements make this appliance very flexible.

Altogether the acrylic body is kept small. The labial arch passes between the 1st and 2nd premolar into the acrylic. The first molars are maintained by thorns. The Coffin spring is positioned in the same way as in type II The acrylic base is the same as in type II From the mesial part of the canines to the distal end of the molars both acrylic parts of the upper and lower jaw are connected.

The making of this appliance corresponds mainly to the one of type II-1, it differs only in the protrusion springs in the upper jaw and the lacking of the occlusal rests for the canines. Two distal spring bows connect the upper and lower part. The elements in the lower jaw are two holding thorns and a connecting bow. The upper jaw consists of protrusion springs, an intermaxillary bow and a Coffin spring. First, both parts, upper and lower, are finished separately.

Interocclusal acrylic is not necessary. With a construction bite, the upper and lower parts are connected in the articulator through spring bows in the distal part of the plates. Through activation of the intermaxillary bow and both spring bows the lower jaw is retruded. Support thorns can also be placed before the molars if needed The appliance is also divided horizontally and is activated through the far distally fixed spring bows.

The tongue crib prevents a negative influence of the tongue. The intermaxillary bow makes a distal movement of the mandible possible. View of the finished appliance type III b. Through this screw a more uniform distal activation of the lower part is possible. Your professionalism is greatly appreciated. Accutech Orthodontic Lab, Inc. You are here Home » Appliances » Functional Appliances. Print A Free Shipping Label.

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