| Author, year |
Country
|
Study design |
Number
of patients (n)
|
With
drawals
-
dropouts |
Results |
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: 16.67 (se 8.03)
At 3 years: 3.33 (se 2.22)
Group 2
Baseline: 8.64 (se 4.45)
At 3 years: 3.09 (se 3.09)
Group 3
Baseline: 17.36 (se 6.84)
At 3 years: 17.36 (se 8.87) |
Group 4
Baseline: 9.52 (se 5.45)
At 3 years: 8.33 (se 5.61)
ns. |
Calculus 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
Mandible
Good or very good: 80%
Maxilla
No calculus |
Group 2
Mandible
Good or very good: 100%
ns.
Maxilla
No calculus |
Calculus index
Group 1= Permanent bonded retainer (PBR ) (upper or lower).
Group 2= Removable retainer (RR).
Smokers and those >50 years were excluded from analysis. |
| 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 |
Gingivally along wire:
Group 1
Interproximal:
0.22 (sd 0.37)
Lingual:
0.15 (sd 0.28)
Group 2
Interproximal:
0.54 (sd 0.53)
Lingual:
0.37 (sd 0.43)
p<0.05 (group 1 vs. 2)
Incisally along wire:
Group 1
Interproximal:
0.07 (sd 0.21)
Lingual:
0.06 (sd 0.18)
Group 2
Interproximal:
0.05 (sd 0.12)
Lingual:
0 (sd 0)
ns. (group 1 vs. 2)
Gingival margin
Group 1
Interproximal:
0.29 (sd 0.35)
Lingual:
0.18 (sd 0.28)
Group 2
Interproximal:
0.49 (sd 0.43)
Lingual:
0.30 (sd 0.30)
ns. (group 1 vs. 2)
Gingival margin:
Group 3
Interproximal:
0 (sd 0)
Lingual:
0 (sd 0) |
Gingival margin:
Group 4
Interproximal:
0 (sd 0)
Lingual:
0.01 (sd 0.04)
ns.
(group 3 vs. 4) |
Presence of calculus at different locations (different calculus indices)
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. |
