Abstract :
[en] Objective: To compare computer-aided design and computer-aided
manufacturing (CAD/CAM) customized nitinol retainers with standard stainlesssteel
fixed retainers over a 12-month study period. Methods: This randomized
controlled trial (RCT) was conducted on 62 patients randomly allocated to a
control group that received stainless-steel retainers or a test group that received
customized CAD/CAM nickel-titanium retainers. Four time points were defined:
retainer placement (T0) and 1-month (T1), 6-month (T2), and 12-month (T3)
follow-up appointments. At each time point, Little’s irregularity index (LII)
(primary endpoint) and dental stability measurements such as intercanine width
were recorded in addition to assessment of periodontal parameters. Radiological
measurements such as the incisor mandibular plane angle (IMPA) were recorded
at T0 and T3. Failure events (wire integrity or debonding) were assessed at each
time point. Results: From T0 to T3, LII and other dental measurements showed
no significant differences between the two groups. The data for periodontal
parameters remained stable over the study period, except for the gingival index,
which was slightly, but significantly, higher in the test group at T3 (p = 0.039).
The IMPA angle showed no intergroup difference. The two groups showed no
significant difference in debonding events. Conclusions: This RCT conducted
over a 12-month period demonstrated no significant difference between
customized CAD/CAM nickel-titanium lingual retainers and standard stainlesssteel
lingual retainers in terms of dental anterior stability and retainer survival.
Both retainers eventually appeared to be equally effective in maintaining
periodontal health.
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