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FAQ


Will you continue to improve the BBC?
Yes, we try to continually improve the BBC. The is is why we greatly appreci-ate your feedback.

Can patients help themselves if there is a problem with the BioBiteCorrector (BBC)?
We recommend always consulting an orthodontist if possible. The screws of the BBC can be opened with a standard 0.9 mm hexagonal wrench.

How can I more easily slide the BBC on the maxillary arch?
Because of the ball joint, the body is very mobile. In clinical practice, it has proved useful to slide the BBC over the archwire in a "straight" position (see video). The clinical video on the website willis also be helpful. It demon-strates in real time how to completely mount the BBC on a patient in only 3 minutes.

The titanium screws frequently loosen.
Be sure to use an archwire .025 inches in width. In addition, you can use a light cured flowable composite to fix in place the screws. They can be un-screwed in a conventional manner using the BBC screwdriver.

Mechanical screw insertion.
The screwdriver of the BBC system allows you to mechanically fix in placeing the screws. However, we do not recommend using a conventional micromo-tor for this purpose. Its speed and torque would be too high, and you might damage the threads of the BBC. Therefore, we recommend the pros-thodontic screwdriver made by W&H. This device allows you to adjust the torque (8-40 Ncm) and features a speed of only 25 rpm.

How can I avoid fractures of the archwire?
We recommend using a stainless steel archwire with a minimum size of .017 x .025 inches. The width of the archwire should always be .025 inches.

Why isn’t there any coil spring inside the BBC MS and BBC Classic?
The BBC is based on the method of "Jumping the bite". This means that only the hinge length determines the desired mandibular position. Therefore, the BBC does not require a coil spring. "Jumping the bite" is a proven meth-od. Many removable functional appliances, such as Twinblock or the fixed Herbst appliance, operate on this principle.

How long does the BBC therapy take?
The BBC works like a Herbst treatment. The fixed Herbst appliance is very well documented in the literature. In general, the BBC treatments takes 6 months in moderate cases. In adults or extreme Class II cases, the BBC should be removed after 9 months. The BBC therapy can be shortened in minor Class II cases (4 months). The multibracket appliance should not be removed immediately after the BBC treatment. The patient should wear short Class II elastics to stabilise the result achieved.

How can the position of the lower jaw be adjusted?
The hinge length (closed BBC) determines the desired mandibular position. After installing the BBC, the lower jaw is guided distally as far as possible. If there is still a distal occlusion, the lower jaw can be shifted forward using the spacers, which are crimped on the appliance. A spacer is 1.5 mm wide, so for instance, to move the lower jaw forward by 4 mm, 3 spacers will be needed. However, this means thate activation will be 4.5 mm, i.e. 0.5 mm too long. This can be compensated for by sliding the BBC on the archwire 0.5 mm forward.

How do the BBC attachments work?
The BBC attachments can be welded to a single band by using a laser. We do not recommend a classical soldering. Due to the large influence of heat, the material properties of the band are significantly deteriorated. For retention splints and snoring devices in combination with a BBC, the attachments can be polymerized on an aligner.

Self-ligating brackets
When using the BBC in combination with SL-brackets, the brackets should be secured with a ligature to protect the locking mechanism.

Ceramic brackets
Ceramic brackets should not be used in close vicinity to the BBC's connecting elements. Generally, this concerns the canines and first premolars in the lower jaw, and the second premolars in the upper jaw.

Rebonding brackets
The following procedure has proven successful when immediately incorporating a steel archwire after bracket loss. Ligate a piece of steel archwire to the bracket before rebonding. Then it will be easier to align the bracket to be rebonded with the adjacent bracket slots, so it can be bonded safely and if possible, passively.

After placing the BBC, there is usually no tooth contact in the posterior re-gion.
As a result of the advancement of the mandible into direct Class I neutral occlusion, the posterior teeth usually do not contact. This is referred to as "Christensen’s phenomenon"and occurs when "jumping the bite". The teeth extrude automatically during the BBC treatment and the deep bite is automatically corrected. After the BBC treatment, the patient should wear short vertical Class II elastics for stabilisation and full tooth contact.

Can "Christensen’s phenomenon" be reduced?
Gradual advancement of the mandible can reduce "Christensen’s phenome-non". In this case, no spacers are used after placing the BBC. The use of the "Small" size in a non-extraction case can also be considered.

The canine in the upper jaw is in contact with the lower connecting element of the BBC.
In general, contact between the BBC and the canine isn’t a problem, but it is possible to move the lower jaw forward with spacers. Then the overbite will decrease, posterior desocclusion will increase, and any contact with the ca-nine of the upper jaw will be avoided.
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