Rectangular_loop_for_molar_derotation | Essential Biomechanics
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- Опубліковано 15 жов 2024
- Rectangular loops are one of the best options for correcting first order discrepancies in terminal molars. With aproppriate preactivations, the R-loop makes it possible to generate any moment-to-force combination to move molars in a predictable direction. Moreover, R-loops made my TMA wires have low deflection rates and a large range of action, which result in a constant and physiological force delivery. Finally, there is no friction with this mechanics, increasing the efficiency of the movement.
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Crédito especial: O modelo impresso usado neste vídeo foi desenvolvido pelo Professor André Drumond, Brasil. Visite seu website (www.orthovirtu...) e encontre excelente material didático sobre ORTODONTIA DIGITAL.
Love you! Very oriented to details🙏❤a pleasure to learn and listen the selections of music🙏thanks
What wire did you use ?
It can be done with toe out bend
Yes, you can. But it's not so fast as R-loop
Thank you for this video! I learned a lot from it! I can't imagine how the loop could be inserted in the mouth. Maybe using slots instead of tubes would make the job easier. How about occlusion? I suppose the lower seven should be free to move.
Dear Dr Leia Tvigun thanks for your comments. The insertion of the loop in the mouth is very easy (with a Weingart plier) when the molar has a position similar to the one of the video (mesial-in). However, when the rotation is in the opposite direction (mesial-out, distal-in), you might have difficulties to insert the loop from the distal. In these cases, you can use a bracket or convertible tube. You can also invert the loop - I mean, you can insert the short segment into the active unit (instead of the rectangular segment). Regarding your question about occlusion, it will depend on the case. In most of the cases, the correction is achieved without any "bite raising" procedure.
Hi Dr. if we dispense with the use of the screw.. how can we get enough anchorage?
A lingual arch offers a great anchorage. Alternatively, a rigid archwire (19 X 25 SS) from molar to molar can also help in most of the cases.
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SO grateful.. thank you so much Dr.
Wouldn't the screw damage the mental foramen?
Dear Max, in most of the cases the mental foramen is, in fact, located between the premolars. However, it's vertical position is, on average, 10 mm above the lower border of the mandible. It means the foramen is usually located below the root's apices of premolars. Moreover, a panoramic radiograph can be used to avoid doubts if needed.
@@essentialbiomechanics9381 awesome! Thank you doc
How can u insert this from distal to molar
The insertion of the loop in the mouth is very easy (with a Weingart plier) when the molar has a position similar to the one of the video (mesial-in). However, when the rotation is in the opposite direction (mesial-out, distal-in), you might have difficulties to insert the loop from the distal. In these cases, you can use a bracket or convertible tube.
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Dear Wasya, the use of continuous archwires in a similar case will have an unpredictable result. It can correct the molar inclination, but the time for this movement would be probably too long, and the effects in adjacent teeth could not be appropriate for the specific solution to this problem.