| Authoryear |
Country |
Study design |
Number
of patients (n) |
With
drawals
-
dropouts |
Results |
Comments |
| Intervention |
Control |
| Fixed retainer |
No retainer |
| Levin, [16] |
Israel |
CT |
n=92
Group 1: n=48
dental arches
Group 2: n=72
dental arches |
n=0 |
Group 1
GR lingual
0.09 mm (sd 0.18)
GR labial:
0.14 mm (sd 0.24)
PD
1.88 mm (sd 0.24) |
Group 2
GR lingual
0.01 mm (sd 0.08)
p=0.005
GR labial:
0.13 mm (sd 0.29) ns.
PD
1.87 mm (sd 0.23) ns. |
Gingival recession (GR).
Probing depth (PD).
Group 1 = One or two fixed retainers.
Group 2 = No fixed retainer.
|
| Rody, [15] |
Canada |
CT |
n=31
Group 1. n=10
Group 2. n=11**
Group 3: n=10 |
? a |
Group 1
Incisors:
Mean: 1.85 mm (sd 0.81)
Premolars:
Mean: 2.15 mm (sd 0.94)
|
Group 3
Incisors:
Mean: 1.7 mm (sd 0.63) ns.
Premolars:
Mean: 2.05 mm (sd 0.59) ns. |
Probing depths.
Group 1 = 3-3 fixed lower retainer.
Group 2 = Removable lower retainer.
Group 3 = No retainer.
|
| Artun, [14] |
Norway |
CT |
n=108
Group 1: n= 31
Group 2: n=18
Grpoup 3: n=14
(Group 4: n=20)
Group 5: n= 25 |
? a |
Groups 1 and 2
Interproximal
Mean: 1.46 (sd 0.30)
Lingual
Mean: 1.07 (sd 0.15)
|
Group 5
Interproximal
Mean: 1.42 (sd 0.32) ns.
Lingual
Mean: 1.11 (sd 0.16) ns.
|
Crevice depth
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. |
