BT2-en – Sia Orthodontic Manufacturer

BT2

Overbite Corrector

BT2 is the key for rapid correction of severe skeletal and deep overbites. Its patented curvature reduces muscle hyperactivity and parafunction, permits anterior guidance of the lower incisors and prevents anterior interferences during forward grinding.

BT2 allows a physiological eruption of molars and premolars without the e ects of molar intrusion.

Its wide and anatomical mesh base ensures a high resistance to debonding, frequent in this type of device due to interference in the occlusion

How it works

The BT2 mechanism of action is that it increases the vertical dimension and reduces the muscle hyperactivity related to CNS tension through the hypothalamus-adrenal pathway.

As the bite is opened with the application of BT2s, elastics are used posteriorly to erupt the buccal segments by lifting the curved archwires occlusally, and to intrude the incisors mildly with low resistance in the brackets. In Class II correction differential eruption is used by placing a full dimension upper arch wire .018” X .025” stainless steel to act more as an anchorage unit and a lower dimension mandibular archwire in .016” X .022” stainless steel.

This permits the lower molars and premolars to be differentially erupted upward and forward to correct the Class II malocclusion. In addition, this also allows the BT2s to work effectively, by simultaneously increasing the anterior vertical dimension to correct the Class II malocclusion in conjunction with the rhomboid elastics bilaterally for Rapid Bite Opening (RBC).

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How to use it

Clinically, BT2s are bonded on the incisal-third region of the upper central incisors in Class II malocclusions. This provides a total of 2 BT2s on the day of first bracket’s bonding. In addition, for each deep overbite treatment BT2s are applied in conjunction with 2 buccal box elastics (1/4”, 4.5 oz.) in rhomboid patterns for Class II correction. The elastics are applied from the labial aspects of the upper canine to the upper first molar, down to the lower second molar and first premolar bilaterally to facilitate Rapid Bite Correction.

Tips for placing BT2s:

Clean the palatal tooth’s surface by using green stone followed by pumice. Patient is asked to position their head up and back, for palate to be as perpendicular to floor as possible.
Position the base of the BT2 with larger base curvature to the incisal edge, and tapered end of bonding pad toward the gingival.
Ideally use the periodontal probe or the thicker neck of Hollenback instrument in the BT2 split opening to seat BT2. Finger pressure may also be used to initially adapt BT2 to palatal curvature of incisors.
Use articulating paper for BT2 occlusal adjustment with green stone for balance if required.

When to use it

BT2s are recommended at all ages including for both early interceptive treatment in children, and in adults.

Sensitive patients are instructed it will take 2-3 days possibly to accommodate to the new vertical height, and to the feeling of the BT2s where wax is also provided to place over the BT2s for 3 days. The ideal recommended time of BT2 placement is at the time of the bracket placement.

BT2s and active self-ligating brackets are ideal with synergistic, specialized i-Arch wires that have a higher vertical dimension than horizontal dimension (for example .018 X .014”) for early moments of torque for control of the roots required in deep overbite correction. The archwires incorporate compensating curve on the upper archwire and reverse curve of Spee for the lower archwire to further facilitate incisor intrusion.

BT2s are worn for at least 6 months, and tooth movements are facilitated by the eruption (or extrusion) of the buccal segments, where the rhomboid-shaped elastics (1/4”, 4.5 oz) are place bilaterally. No clinically significant root resorption is found with the use of this biocompatible force system as it reduces the vertical mandibular overclosure and muscle activity gradually.