Two-year survival analysis of twisted wire fixed retainer versus spiral wire and fiber-reinforced composite retainers|RISS 상세보기

다국어 초록 (Multilingual Abstract)

Objective: Traditional retainers (both metal and fiber-reinforced composite [FRC]) have limitations, and a retainer made from more flexible ligature wires might be advantageous. We aimed to compare an experimental design with two traditional retainers. Methods: In this prospective preliminary clinical trial, 150 post-treatment patients were enrolled and randomly divided into three groups of 50 patients each to receive mandibular canine-to-canine retainers made of FRC, flexible spiral wire (FSW), and twisted wire (TW). The patients were monitored monthly. The time at which the first signs of breakage/debonding were detected was recorded. The success rates of the retainers were compared using chi-squared, Kaplan-Meier, and Cox proportional-hazard regression analyses (α = 0.05). Results: In total, 42 patients in the FRC group, 41 in the FSW group, and 45 in the TW group completed the study. The 2-year failure rates were 35.7% in the FRC group, 26.8% in the FSW group, and 17.8% in the TW group. These rates differed insignificantly (chi-squared p = 0.167). According to the Kaplan-Meier analysis, failure occurred at 19.95 months in the FRC group, 21.37 months in the FSW group, and 22.36 months in the TW group. The differences between the survival rates in the three groups were not significant (Cox regression p = 0.146). Conclusions: Although the failure rate of the experimental retainer was two times lower than that of the FRC retainer, the difference was not statistically significant. The experimental TW retainer was successful, and larger studies are warranted to verify these results.

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목차 (Table of Contents)

INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSION
CONCLUSION

INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSION
CONCLUSION
REFERENCES

참고문헌 (Reference)

1 Ellakwa AE, "The influence of fibre placement and position on the efficiency of reinforcement of fibre reinforced composite bridgework" 28 : 785-791, 2001

2 Rowland H, "The effectiveness of Hawley and vacuum-formed retainers: a singlecenter randomized controlled trial" 132 : 730-737, 2007

3 Zachrisson BU, "The bonded lingual retainer and multiple spacing of anterior teeth" 15 : 247-255, 1982

4 Chong KH, "Strength and mode of failure of unidirectional and bidirectional glass fiberreinforced composite materials" 16 : 161-166, 2003

5 Radlanski RJ, "Stability of the bonded lingual wire retainer-a study of the initial bond strength" 65 : 321-335, 2004

6 Littlewood SJ, "Retention procedures for stabilising tooth position after treatment with orthodontic braces" (1) : CD002283-, 2006

7 Durbin DD, "Relapse and the need for permanent fixed retention" 35 : 723-727, 2001

8 Meiers JC, "Preimpregnated, fiber-reinforced prostheses. Part II. Direct applications: splints and fixed partial dentures" 29 : 761-768, 1998

9 Iniguez I, "Polyethylene ribbon and fixed orthodontic retention and porcelain veneers: solving an esthetic dilemma" 10 : 52-59, 1998

10 Orchin JD, "Permanent lingual bonded retainer" 24 : 229-231, 1990