| 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:
0.85mm (sd 0.55)
Group 2:
0.63mm (sd 0.20)
Group 3:
0.62mm (sd 0.25) |
Group 4:
0.72mm (sd 0.33)
ns. |
Attachment loss (i.e. probing attachment level from cement-enamel junction to the bottom of the gingival pocket).
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 |
No gingival recession
Alveolar bone level
Group 1: maxilla:
Good or very good: 85%
Group 1, mandible:
Good or very good: 100%
|
No gingival recession
Alveolar bone level
Group 2, maxilla:
Good or very good: 90%
Group 2, mandible:
Good or very good: 90%
ns. |
Gingival recession
Alveolar bone level rating: Very good, good, fair, poor, very poor.
Group 1= Permanent bonded retainer (PBR ) (upper or lower).
Group 2= Removable retainer (RR).
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
Incisor:
1.85 mm (sd 0.81)
Premolar:
2.15 mm (sd 0.94)
|
Group 2
Incisor:
1.68 mm (sd 0.46)
Premolar:
2.04 mm (sd 0.56)
ns. |
Probing depth
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
Group 3: n=14
Group 4: n=20
(Group 5: n= 25) |
?a |
Group 3
1.87mm (sd 0.44)
|
Group 4
1.60mm (sd 0.31)
p<0.05
|
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. |
