How to use the versatility of MBT prescription: canines.

“Don’t make the process more difficult than it is”. Jack Welch.

One of the major strengths of the MBT technique resides in the ability to show versatile in many situations , allowing to change the position of a tooth or group of teeth ( in particular angle and torque ) without using additional brackets or make folds on the arc in the final stages of treatment .
In this post we will fix attention on the canine bracket .

In this post we will fix the attention on the canine bracket .


 

MBT Prescription  equipment for upper and lower canines.

1.Arch Form

Arch form is an important factor when selecting canine brackets, and the authors have discussed this on many texts of MBT. Accordingly, when treating patients with well-developed arches, and provided substantial tooth movements are not required, the -7° for upper and -6° for lower are normally chosen.


 

2. Extraction Cases

After extraction of first premolars the treatment often involves correction of canine root tip, or bodily retraction of canine. The 0° torque bracket, are normally recommended for this. The necessary tooth movements are difficult to achieve if the canine roots are against the cortical plate. They need to be cancels bone for effective movement.Diapositiva1

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3. Agenesy of upper lateral incisors

When treating cases with agencies of an upper lateral incisor, a decision is sometimes made to close tha space and to move an upper canine into the position of tre missinig upper incisor. For good root control, it isman ad vantare to’ invertnthe -7° torque bracket on the canine to be mov ed mesially. The torque value of + 7° guides the canine root tosar ds cancellus bone, for ease of movement, and reduces the root prominence for better aesthetics.

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4. Lower canine tip in class III cases

There is incisor torque compensation aster most non-surriscalda Class III treatments. The lower incisiors tend to be retoinclinated and the upper incisiors proincilned. There is also tip compensation of lower canines in many of the se cases. In some treatments it is helpful to anticipate this, and to switch left and right lower canine brackets. This change the tip from +3° to -3° and can make the mechanics easier.

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5. Before the  orthognathic surgery in Class 3
When preparing the arches for orthognathic surgery is necessary to remove the fees or anatomical adaptations that physiologically they are made . It must , among other things , increase the tip of the lower canine and decrease that of the maxillary canine . To achieve this more easily , you can , as suggested by Gianluigi Fiorillo , used for each upper canine or below the bracket of the contralateral belonging arch opposite . In this way the top showing increased Tip, you will have a prescription low Tip 3 º ; over the lower a high Tip to +8º.

6. Canine and periodontal thin  
In cases with  thin periodontal, gingival recession, ectopia vestibular or canine from vestibular inclusion, the root is very superficial. In these cases it is appropriate to “hide” using a prescription to positive Tq: this will bring the crown buccally and root, as desired, the lingual or central ridge. In these cases the bracketa will be rotated 180 º determining a infor of + 7 ºTq and + 6 ºTq respectively for the upper and for the lower canine.
In conclusion we have at least six different situations in which the principle of flexibility applied to Tq and Tip allows us to better manage the location and movement of the canine. What in other routine has been transformed into a commercial opportunity to “sell” other brackets, MBT already had planned. For instance the classic bracket rotated 180 * incisor palatal is basically a Low Torque despite being the only one usually bracket.

 

Giovanni Lopez

 

 

 

 

 

 

 

 

 

 

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