Orthotown June 2018 - 14
message board
Mechanics When Extracting 5s
A Townie asks for opinions about how to close up the space left after extractions
NickTi
Member Since: 12/04/10
Post: 1 of 20
Interested in hearing opinions on mechanics for closing 5s spaces. I was trained primarily using
McLaughlin's segmental method, but not convinced it's worth two stages of levelling/aligning. ■
3/7/2018
Fenrisúlfr
Member Since: 02/25/09
Post: 2 of 20
I have used sectional mechanics, but it's way more efficient to sequentially engage teeth with
continuous arches and retract en masse with sliding mechanics. Here are two cases-one with
sectional arches (took longer) and another one with continuous arches but not sequentially engaged
(bad idea in cases of significant crowding because of round-tripping).
So, a hybrid method would be to unravel crowding in .018 SS partially tied in the anterior
until you have enough space to engage and align the 2-2. ■
3/7/2018
Emac
Member Since: 11/21/11
Post: 3 of 20
14
It depends on the anchorage requirements for the case. I pick my appliance based on the
treatment plan.
If I am trying to drag molars, I will use mechanics that add anchorage to the anterior, like
torque or uprighting springs, and have my arches offset into a headgear tube. I have taken a bur to
a rectangular wire to polish it into a round wire in the molars to help sliding mechanics. I usually
use Class I elastics. Molars tip and rotate into space closure. After space is closed, I upright and
align. Sometimes it takes a while to get good uprighting of the molar.
If I am trying to retract anterior teeth, then I use light-wire mechanics. I have never used
anything that moves teeth more efficiently than old school light wire. Either way, I almost always
close space en masse, usually with a loop in the AW mesial to the canines.
IMO, edgewise/straight wire is very good for finishing, holding teeth in position and burning
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