The present study aims to assess the effectiveness of three different retention schemes used to maintain tooth position after orthodontic treatment with fixed orthodontic appliances (stability) and to evaluate possible association between retention scheme and gingival recessions on the lingual surfaces of the lower anterior teeth seen for up to 5 years post-treatment. Moreover the possible association between primary relapse tendency and long term occlusal stability will be evaluated.
This is a randomized, controlled, single-center, equivalence trial with three parallel groups and an allocation ratio of 1:1:1, that aims to investigate the effectiveness of 3 orthodontic retention schemes on post-treatment mandibular arch stability and gingival recession.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
60
lower fixed canine and canine retainer (0.028 stainless steel bonded to canines) and upper removable Hawley (Intervention A)
lower fixed canine to canine retainer (7-strand Twistflex 0.027 bonded to all six anterior teeth) and upper removable Hawley (Intervention B)
lower Hawley-type and upper Hawley removable retainer (Control)
Department of Orthodontics, School of Dentistry, University of Athens
Athens, Goudi, Greece
Changes in Little's Irregularity Index in the mandible (mm)
Time frame: 1 year in retention, 2 years in retention, 5 years in retention
Changes in Intercanine width in the mandible (mm)
Time frame: 1 year in retention, 2 years in retention, 5 years in retention
Changes in Interpremolar width in the mandible (mm)
Time frame: 1 year in retention, 2 years in retention, 5 years in retention
Changes in Intermolar width in the mandible (mm)
Time frame: 1 year in retention, 2 years in retention, 5 years in retention
Changes in Arch length in the mandible (mm)
Time frame: 1 year in retention, 2 years in retention, 5 years in retention
Changes in Gingival Recessions on the lingual surfaces of the six lower anterior teeth
Time frame: 1 year in retention, 2 years in retention, 5 years in retention
Changes in Intercanine width in the maxilla (mm)
Time frame: 1 year in retention, 2 years in retention, 5 years in retention
Changes in Interpremolar width in the maxilla (mm)
Time frame: 1 year in retention, 2 years in retention, 5 years in retention
Changes in Intermolar width in the maxilla (mm)
Time frame: 1 year in retention, 2 years in retention, 5 years in retention
Changes in Arch length in the maxilla (mm)
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Time frame: 1 year in retention, 2 years in retention, 5 years in retention
Changes in Overbite and Overjet (mm)
Time frame: 1 year in retention, 2 years in retention, 5 years in retention
Accidental bond failures of fixed retainers or breakages of removable ones
Time frame: 1 year in retention, 2 years in retention, 5 years in retention
Leveling or torque related problems of the lower anterior teeth
Time frame: 1 year in retention, 2 years in retention, 5 years in retention