Two-year survival analysis of twisted wire fixed retainer versus spiral wire and fiber-reinforced composite retainers: a preliminary explorative single-blind randomized clinical trial.

Korean J Orthod · 2016 · PMC4807147 · PMID 27019825

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marginally significantno p-value reported

The Cox regression analysis showed no significant overall difference between the treatments ( p = 0.146, Figure 1 , Table 2 ), although a marginally significant difference was detected in the survival rates between the FRC and TDW retainers.

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