Counter rotation or offset is an important part of preadjusted appliances. But contemporary brackets have no built in counter rotation. Neither bracket prescription tables quoted in renowned books have bothered to add counter rotation values.
Hi HAris,
Ormco's Orthos bracket system has a "rotation in slot" added to the canines. It is not actually done with the purpose of controlling rotation during retraction but rather to allow lower profile brackets on the incisors without compromising alignment.
Most molar tubes also have distal offsets added to them as well.
Take care,
Renato
Dear Renato . Thanks for the answer
There is a problem with that design in ormco .if a canine has mesial counter rotation to compensate incisor prominence and not to compensate translation than a posterior dentition should have either increased prominence or alternation mesial and distal prominence features in alternative teeth to avoid 1st order problem.
But question still remain Why do contemporary brackets have no built in counter rotation? Are we too good in controlling rotation during translation that we don't need it ? or we have to always opt to wire bending to correct it ?
Dear Fabio
Thanks for the response. But the question is why present day brackets don't use counter rotation or offset in their brackets apart from upper molars. Have we stopped doing translation?
Thanks Nirmala but whats about my question ? Why contemporary brackets have no offset apart from molar. We do their translation so we need to counter rotation. Why we have abandoned the 3rd dimension of control in translation?
Dear Fabio
Thanks for giving to the point answer . Counter rotation was important aspect of preadjusted system in translation series brackets. Even Roth carried it forward. That is quite obvious in Roth writings of 70s and 80s. i don't know where and when the evolution came and even modern Roth prescription is without this feature.
My Hypothesis is as under
We are part of bandwagon and don't go in details of what we are using. We do orthodontics which manufacturer of brackets make us to do. Prescription is taken so simple that manufacturer make their own prescription . In a personal research i find out that Roth prescription values are written different ever where . You wont find the same values in contemporary orthodontics By William Proffit ,Bristol Notes ,Dentaurum catalog and densply catalog.
MBT prescription values in 3M and Dentaurum brackets are different .
So we dont care and sometimes we dont know .We all have teachers they live in age of wire bending . So they say whatever come we will make final adjustment in wire bending.Some people don't want that art to die that's way bracket prescription is taken lightly.
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