%0 Journal Article
%T Failure patterns of different bracket systems and their influence on treatment duration: A retrospective cohort study
%A Andreas J£¿ger
%A Christoph Bourauel
%A Dimitrios Stasinopoulos
%A Frank Kirsch
%A Nikolaos Daratsianos
%A Spyridon N. Papageorgiou
%J -
%@ 1945-7103
%D 2018
%R https://doi.org/10.2319/081817-559.1
%X ABSTRACT Objectives: To compare the failure pattern of four different bracket types and to assess its effect on treatment duration. Materials and Methods: A total of 78 white patients (28 male, 50 female) with a mean age of 12.6 years were included in this retrospective cohort study and treated for a mean period of 30.6 months. The patients were treated in a private practice with stainless steel conventionally ligated brackets, ceramic conventionally ligated brackets, stainless steel self-ligating brackets, or nickel-free self-ligating brackets. The loss of at least one bracket during the course of treatment was analyzed with Cox proportional hazards survival analyses and generalized linear regression. Results: The overall bracket failure rate at the tooth level was 14.1% (217 brackets), with significant differences according to tooth type (between 8.0%¨C23.4%) and bracket type (between 11.2%¨C20.0%). After taking confounders into account, patients treated with ceramic brackets lost more brackets (hazard ratio = 1.62; 95% confidence interval = 1.14¨C2.29; P = .007) than patients with stainless steel brackets. On average, treatment time increased by 0.6 months (95% confidence interval = 0.21¨C1.05; P = .004) for each additional failed bracket. Conclusions: Bracket failure was more often observed with ceramic brackets and was associated with increased treatment duration.
%K Bracket failure Treatment duration Treatment efficiency Survival analysis Clinical study
%U http://www.angle.org/doi/abs/10.2319/081817-559.1