The purpose of this trial is to evaluate and compare stability after orthodontic treatment with an Essix retainer and a bonded cuspid-to-cuspid retainer (CTC), respectively in the mandibular arch and longitudinally follow these patients over time up to 5 years. The patients' perceptions of the two methods are also evaluated with questionnaires during the follow-up period. A further aim of this study is to analyze the relationship between diagnosis, treatment outcome, treatment time, age at start of treatment and stability with an Essix retainer in the maxilla. The null hypotheses are: * that there is no difference in retention capacity between Essix retainer and cuspid-to-cuspid retainer * that there is no difference in patients' perception between Essix retainer and cuspid-to-cuspid retainer * that there is no difference in retention capacity for Essix retainer in the maxilla concerning diagnosis before treatment, treatment outcomes, treatment time and age at start of treatment
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Changes in Tooth Position
Timeframe: Changes in tooth position (Little's Irregularity Index) were analysed 5 years (T4) after debonding (T1)