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Comparison of survival time between two types of orthodontic fixed retainer: a prospective randomized clinical trial.

Salehi P, Zarif Najafi H, Roeinpeikar SM - Prog Orthod (2013)

Bottom Line: Kaplan-Meier analysis and the logrank test were employed to identify significant differences in the survival functions between the groups.The differences were not statistically significant.Regarding the evaluation period, the differences had limited clinical significance.

View Article: PubMed Central - PubMed

Affiliation: Orthodontics Research Center, Department of Orthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. zarifhooman@gmail.com.

ABSTRACT

Background: The aim of this prospective clinical study was to compare the mean durability and the failure rates of two types of orthodontic retainers.

Methods: Orthodontic patients (142) aged between 14 and 28 years were recruited in this study. The polyethylene woven ribbon (Ribbond, Seattle, WA, USA) retainer was compared with a 0.0175-in flexible spiral wire (Respond, Ormco, Glendora, CA, USA) retainer. When treatment was completed, the retainers were bonded from canine to canine in the maxillary and the mandibular arches of the participants. In the follow-up visits, the patients were re-evaluated every 3 months over a period of 18 months. The time taken for the retainers to remain without any fracture was appraised. Kaplan-Meier analysis and the logrank test were employed to identify significant differences in the survival functions between the groups. The rates of the retainers' failure between the groups were analyzed using Chi-square test.

Results: It was revealed that the mean survival of the flexible spiral wire retainer was 15.34±0.47 and 15.60±0.42 months in the maxillary and mandibular arches, respectively. The mean survival of the ribbon retainer was 13.95±0.55 and 14.26±0.57 months in the maxillary and mandibular arches, respectively. Ribbon retainers showed a failure rate of 50% in the maxillary and 42.6% in the mandibular arches. Flexible spiral retainers showed a failure rate of 36.5% in the maxillary and 37.8% in the mandibular arches. The differences were not statistically significant. Regarding the evaluation period, the differences had limited clinical significance.

Conclusion: The mean survival time and the failure rates of the polyethylene woven ribbon retainer were comparable to the flexible spiral wire retainer during the 18 months after orthodontic treatment.

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Related in: MedlinePlus

Kaplan-Meier survival plot of the multi-stranded and ribbon retainer in the mandibular arch.
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Fig3: Kaplan-Meier survival plot of the multi-stranded and ribbon retainer in the mandibular arch.

Mentions: The flow diagram reported in Figure 1 illustrates the design and conduct of the current randomized clinical trial. Descriptive statistics for the survival time in both retainer types are shown in Table 1. Figures 2 and 3 illustrate the Kaplan-Meier survival curves for the two types of retainers in the maxillary and mandibular arches. The logrank test revealed no statistically significant difference between the two types of retainers in the maxillary (P = 0.084) or the mandibular arches (P = 0.314) in terms of survival function.Figure 1


Comparison of survival time between two types of orthodontic fixed retainer: a prospective randomized clinical trial.

Salehi P, Zarif Najafi H, Roeinpeikar SM - Prog Orthod (2013)

Kaplan-Meier survival plot of the multi-stranded and ribbon retainer in the mandibular arch.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4384958&req=5

Fig3: Kaplan-Meier survival plot of the multi-stranded and ribbon retainer in the mandibular arch.
Mentions: The flow diagram reported in Figure 1 illustrates the design and conduct of the current randomized clinical trial. Descriptive statistics for the survival time in both retainer types are shown in Table 1. Figures 2 and 3 illustrate the Kaplan-Meier survival curves for the two types of retainers in the maxillary and mandibular arches. The logrank test revealed no statistically significant difference between the two types of retainers in the maxillary (P = 0.084) or the mandibular arches (P = 0.314) in terms of survival function.Figure 1

Bottom Line: Kaplan-Meier analysis and the logrank test were employed to identify significant differences in the survival functions between the groups.The differences were not statistically significant.Regarding the evaluation period, the differences had limited clinical significance.

View Article: PubMed Central - PubMed

Affiliation: Orthodontics Research Center, Department of Orthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. zarifhooman@gmail.com.

ABSTRACT

Background: The aim of this prospective clinical study was to compare the mean durability and the failure rates of two types of orthodontic retainers.

Methods: Orthodontic patients (142) aged between 14 and 28 years were recruited in this study. The polyethylene woven ribbon (Ribbond, Seattle, WA, USA) retainer was compared with a 0.0175-in flexible spiral wire (Respond, Ormco, Glendora, CA, USA) retainer. When treatment was completed, the retainers were bonded from canine to canine in the maxillary and the mandibular arches of the participants. In the follow-up visits, the patients were re-evaluated every 3 months over a period of 18 months. The time taken for the retainers to remain without any fracture was appraised. Kaplan-Meier analysis and the logrank test were employed to identify significant differences in the survival functions between the groups. The rates of the retainers' failure between the groups were analyzed using Chi-square test.

Results: It was revealed that the mean survival of the flexible spiral wire retainer was 15.34±0.47 and 15.60±0.42 months in the maxillary and mandibular arches, respectively. The mean survival of the ribbon retainer was 13.95±0.55 and 14.26±0.57 months in the maxillary and mandibular arches, respectively. Ribbon retainers showed a failure rate of 50% in the maxillary and 42.6% in the mandibular arches. Flexible spiral retainers showed a failure rate of 36.5% in the maxillary and 37.8% in the mandibular arches. The differences were not statistically significant. Regarding the evaluation period, the differences had limited clinical significance.

Conclusion: The mean survival time and the failure rates of the polyethylene woven ribbon retainer were comparable to the flexible spiral wire retainer during the 18 months after orthodontic treatment.

Show MeSH
Related in: MedlinePlus