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Kaplan–Meier plot for bracket survival according to bracket system. Ceramic conventionally ligated brackets were 60% more prone to failure at any time when compared with SS conventionally ligated brackets (hazard ratio = 1.6; 95% confidence interval = 1.1–2.3). SS indicates stainless steel; CL, conventionally ligated; SL, self-ligated; Ni-free, nickel free.
