acific Coast Society of Orthodontists Bulletin Summer 2018 - 29

Special Section

Retention: Survey Responses

RETENTION

University of Washington

University of Alberta

University of British Columbia

Do residents fabricate their
own retainers?

Yes-Essix and bonded 3-3

No

No

If so, approximately how
many of each type of retainer
does each resident fabricate?

Hawley: 0, vacuum-formed: all, fixed:
all

N/A

N/A

What percentage of patients
receive the following retainer
types?

Hawley: 50% (upper), vacuum-formed: Hawley: 20%, vacuum-formed: 80%,
50% (U/L), fixed: (lower)
fixed: 70%

33% each

In patients receiving fixed
retainers, are overlay removable retainers also provided?

No

Yes-vacuum formed

Yes-Essix

How are final models for
retention taken?

Intraoral scanner

Alginate impressions

Alginate impressions

For each of the following
conditions, please note the
influence, if any, on retainer
choice:

All except Phase I therapy influence
retainer selection.

Extractions: Hawley or vacuum, Anterior open bite: vacuum, Deep bite:
Hawley with bite pad, Crowding:
either, Spacing: Hawley or vacuum,
Midline diastema: space maintainers
with spurs, Posterior crossbite: TPA,
Anterior crossbite: N/A, Phase I: fixed
to allow posterior teeth to erupt

Extractions: Hawley or Essix, Anterior
open bite: Hawley with posterior bite
plate or Essix, Deep bite: Hawley with
anterior bite plate, Crowding: Hawley
or 3-3 fixed, Spacing: Essix, Midline
diastema: bonded, Posterior crossbite:
Hawley, Anterior crossbite: Essix or
Hawley, Phase I: modified Hawley

Is there a general posttreatment retention protocol
taught at the school?

Varies with faculty

No-varies with faculty

Yes

If yes, what is the protocol?

N/A

N/A

Full-time 3 months, nights for 6
months, then reduction to alternate
nights

At what time points are
patients seen for retainer
checks?

6 weeks, 3 months, 6 months

1 month, 6 months, 12 months,
24 months

At posttreatment review (2 months),
6 months, then 12 months for
discharge

Does the university take postretention records? If so, at
what time point?

No

No

Yes-final records taken at deband,
additional as needed

How long after treatment
is the patient followed in
retention? Is the patient ever
dismissed?

2 years at no charge

24 months

12 months unless relapse; then longer
or retreat

Do you believe that the type
of retainer influences patient
compliance?

Yes, Essix is less obtrusive, and seems
to be used better than Hawley.

Yes, retainer selection is discussed
with patients.

No

Estimate the percentage of
breakage with the following
retainer types:

Not answered

Hawley: 1%, vacuum-formed: 25%,
fixed: 50%

Minimal with all types

How do you fix minor relapse
in the retention phase?

Both fixed and removable-depends
on amount of relapse

Both fixed and removable (vacuumformed) appliances

Removable-Invisalign

Do you charge the patient for
minor relapse if it is within
your retention period?

Depends on individual situation

Yes

Yes

When do you charge a separate fee for retention visits?

Officially, after 2 years, but we rarely
charge unless new retainer needed

Never

After 12 months

Summer 2018  PCSO Bulletin

29



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