Orthotown November 2021 - 16
message board
18 and 22 Slot
Townies get theoretical and discuss swapping a common slot with a different bracket
Swajyorthodontics
Member Since: 09/02/21
Post: 1 of 8
justinudm
Member Since: 09/29/14
Post: 2 of 8
Just out of curiosity, what would happen if someone used 18 and 22 slot brackets in upper
and lower arch, respectively? ■
You would most likely express the torque of the 18 slot brackets ... and very little if any
torque of the 22 slot brackets. A 16x22 wire in a 22 slot acts essentially as a round wire due to
the amount of slop. ■
9/22/2021
dhmjdds
Member Since: 11/16/04
Post: 3 of 8
I guess I do not understand the question. As Justin alluded to, if you are using the same size
AWs in both prescriptions, the torque expression would be very different.
Why would you want to use different slot sizes in the two arches? Do you want stiffer wires
fesdds
Member Since: 05/22/08
Post: 4 of 8
in the lower to help level the COS? Other than that, I'm not seeing a reason here. ■
First off, what is going to happen all depends on what you choose to do. Remember, you have
ultimate control of what you do with the brackets.
I had a transfer come in this week with .018 bracket I use. The upper was doing well. The
lower needed lots of repos and three brackets added. I kept the upper .018 brackets and bonded
my lower .022 brackets.
I expect the case to treat out as if I bonded all .018 or all .022 brackets because I will alter
Earl Johnson DDS,
ABO Mill Valley, CA
Member Since: 01/07/12
Post: 5 of 8
my upper wire choices as needed. Simple. ■
You then have two different mechanical systems to work with. I was trained in .022 and have
used .018 system for 36+ years. The .018 is a lower-force system that will do everything a .022
system will do. It is gentler and faster, I have not used a stiff .018-by-.025 archwire in years. It is
quite similar to the heavier crowbar, .019-by-.025, that is used extensively with the .020 system.
Make a decision and use the same system in both arches. I vote for 0.018 top and bottom! ■
10/7/2021
liangdds
Member Since: 02/18/08
Post: 6 of 8
There has been a system using the combination for more than 30 years. It is called the
bidimensional technique. It was developed by Anthony Gianelly at Boston University and is still
taught there.
.018 brackets are used in the incisors. All of the rest of the brackets are .022. This was to
help maintain torque during space closure in extraction cases. Dr. Gianelly employed some very
logical mechanics and was a stickler for maintaining anchorage.
There is a now-out-of-print textbook that can be found online. ■
10/8/2021
9/24/2021
9/23/2021
9/22/2021
16 NOVEMBER 2021 // orthotown.com
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