according to SWA principle, certainly bracket with torque in the base is best.But some companies make the bracket with torque in the face.
is there any advantate of the bracket with torque in the face?
As I see, the patency of the base torqued bracket does not last any longer,then why do some companies make the bracket with torque in the face.
It is cheaper for companies to fabricate brackets with torques in the face , rather than the base. It goes against the SWA system advocated by Andrews. This will never add the calculated amount of torque in the mid mid point of the clinical crown.
I'd recommend the Straight.wire appliance paper published in the JCO .It is a classic, and very informative.
Thanks, Alyan.
But What is the reason for being cheaper to fabricate brackets with torques in the face.
The mold for torques in the face is cheaper?
in my opinion also torque in base is better than the torque in face for better control during mechanics.
as base adapts to the tooth structure more precisely.
There is no defference. Any torque within bracket slot is transfered to the upper and lower edges of the slot edges and eventually transmitted to the base of the brachet, then to the tooth through bracket site. The issue is how to custome-activate the wire for selective torque and avoid the harmful prefabricated pretorqued brackets.
Thanks, Dr. Khouri.
But what about the slot line up? is it negligible?
What is the true reason some manufacturers make the slot toruqed bracket?
some days before I called to the staff in one Korean bracket manufacture company.
And asked the reason why they made the bracket with torque in the face.
His answer is as follows;
1.as result of trial and error, we experienced the fracture and high profile of bracket when we make the bracket as torque in face. it is easy to satisfy many conditions when making slot torqued bracket.
2.communicating with many Korean Orthodontic professors, we had never heard of problem of slot torqued bracket.
And I practised simple confirmation for bracket torque with photograph.
In case of Damon upeer anterior braeket, the ormco company claim that their bracket is the bracket with base torque.
The condition of base torque bracket is that the center of slot and the center of the bracket base and the center of FA point is same.
But by my photographic measure they are not same.
By bracket positioner incorporated with bracket in Damon bracket it is possible to place the bracket in FA point. But if the standard is placed to the bracket base , the center of the slot is not coincident with the FA point.
So , My conclusion is that regardless the bracket is slot torque or base torque we may place the bracket right if we place the bracket with coincidence of center of the slot and FA point.
How are your opinions, Drs?
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials
- Inorganic Materials
- Metals
- Alloys
- Steel