Orthotown March 2018 - 36

4.4
vs
2.4

4.5

vs

2.2

7.1
vs
3.4

Patient data

OSL

SLX

Number of repositioned brackets

4.5

2.2

Number of repaired brackets

2.9

1.4

Total number of rebonded brackets

7.1

3.4

Number of detailing appointments

4.4

2.4

Total number of appointments

19.9

12.8

Number of minutes of chair time

680

434

Number of months in treatment

23.9

12.5

Table 1

to provide the same data set, again on 12
consecutive debonds of each system.
The combined practice data resulted
in 36 patients in each cohort, with a total
sample of 72 patients. The summary averaged
results are presented in Table 1.

19.9
vs
12.8
36

MARCH 2018 // orthotown.com

Interpreting the data
How can we interpret this data, and
why is there such a dramatic difference in
every metric, with similar findings in all
three practices?
It is our belief that although both
brackets utilize passive self-ligation, there
are fundamental design differences between
the two. The OSL bracket has a consistent
width among all brackets, independent of
tooth anatomy, whereas the SLX bracket
is designed so that each bracket width is
dependent upon the width of the tooth
on which it's intended to be placed. That
results in smaller interbracket distances
with the SLX system, so rotation correction
and leveling occur earlier in treatment with
smaller dimension wires.
The depth of the archwire slot also is
different, with the SLX bracket being 0.028

and the OSL being as much as 0.033 (HSO
internal engineering study), with the OSL
also having greater variability of bracket
slot dimension from one bracket to another.
The difference in slot depth also results in
the SLX system providing earlier rotation
correction on a more consistent basis. The
number of repositioned brackets is less with
the SLX system because of the numerous
visual cues that make initial placement and
bracket positioning more straightforward,
as well as an enhanced pad design that
more closely adapts to the tooth anatomy.

Repaired brackets
The number of repaired brackets is less
with the SLX system, and we propose three
possible reasons.
1. The pad more closely adapts to the
tooth anatomy, so less time is spent
adjusting the bracket position before
polymerization. That means there is
less opportunity for the adhesive to
begin curing, only to have the bond
weakened by additional tweaking of
the bracket position.
2. The SLX brackets have a lower facial



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Table of Contents for the Digital Edition of Orthotown March 2018

Orthotown March 2018 - Cover1
Orthotown March 2018 - Cover2
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