| Author, year |
Country |
Study design |
Number
of patients (n) |
With
drawals
-
dropouts |
Result |
Comments |
Intervention
Fixed retainer |
Control
Removable retainer |
|
| Artun [11] |
USA |
RCT |
n=49
Group 1: n=11
Group 2: n=13
Group 3: n=11
Group 4: n=14 |
?a |
Group 1
Baseline: 0.32 (se 0.20)
At 3 years: 0.06 (se 0.02)
Group 2
Baseline: 0.17 (se 0.08)
At 3 years: 0.10 (se 0.03)
Group 3
Baseline: 0.26 (se 0.2)
At 3 years: 0.13 (se 0.07) |
Group 4
Baseline: 0.31 (se 0.11)
At 3 years: 0.13 (se 0.06)
ns. |
Plaque index
Group 1= Mandibular cuspid retainer .032 plain wire.
Group 2= Mandibular cuspid retainer .032 spiral wire.
Group 3= Mandibular 3-3 retainer .0205 flexible spiral wire.
Group 4= Removable lower retainer.
Cuspid retainer- bonded only to cuspids.
3-3 retainer- bonded to each tooth.
|
| Cerny [12] |
UK |
CT |
n=61
Group 1: n=46
Group 2: n=43
|
?a |
Group 1
Mandibular lingual
Good or very good
40%
|
Group 2
Mandibular lingual
Good or very good
80%
ns. |
Group 1= Permanent bonded retainer (upper or lower).
Group 2 = Removable retainer.
Dental plaque accumulation rating: Very good, good, fair, poor, very poor.
Smokers and those >50 years were excluded from analysis. |
| Rody [15] |
Canada |
CT |
n=31
Group 1: n=10
Group 2: n=11
(Group 3: n=10)
|
?a |
Group 1, incisors:
60 % (sd 52)
Group 1, premolars:
10 % (sd 31.6) |
Group 2, incisors:
18.18% (sd 40)
p<0.05
Group 2, premolars:
9.1% (sd 30)
ns. |
Group 1= 3-3 fixed lower retainer.
Group 2= Removable lower retainer.
(Group 3= No retainer).
Proportion of tooth surfaces with dental plaque.
|
| Artun [14] |
Norway |
CT |
n=108
Group 1: n= 31
Group 2: n=18
Group 3: n=14
Group 4: n=20
(Group 5: n= 25) |
?a |
Gingival margin:
Group 3
Interprox: 0.83 (sd 0.41)
Lingual: 0.49 (sd 0.47)
Gingivally along wire:
Group 1
Lingual: 0.17 (sd 0.23)
Group 2
Lingual: 0.32 (sd 0.29)
p<0.05
Between group 1 and 2
Gingivally along wire
Interproximal:
Group 1 versus Group 2
ns.
Incisally along wire:
Group 1 versus Group 2
ns.
Gingival margin:
Group 1 versus Group 2
ns. |
Gingival margin:
Group 4
Interprox: 0.64 (sd 0.43)
Lingual: 0.38 (sd 0.40)
ns. |
Group 1= Mandibular cuspid retainer .032 spiral wire.
Group 2= Mandibular cuspid retainer .032 plain wire.
Group 3= Maxillary .0195 flexible spiral wire retainer.
Group 4= Maxillary retainer plate.
(Group 5= No retainer).
Cuspid retainer = bonded only to cuspids.
3-3- retainer = bonded to each tooth. |
