The aim of this study is to compare between the stability of anterior and posterior segments in both arches using bonded lingual retainers versus a combined protocol of retention (bonded lingual retainer and vacuum formed retainers). The effect of different treatment changes achieved on the post-treatment stability will be studied in both groups.
Hypothesis: No difference between BR and BR+VFR regarding the stability of anterior segment alignment and posterior segment alignment and interdigitation
Adult patients at the end of comprehensive orthodontic treatment after extraction of upper and lower first premolars and requiring subsequent application of a lingual and palatal bonded retainers
Good oral hygiene
Patients whom the pre-treatment records (models) are available
Good finishing criteria (ABO grading system)
Non-extraction orthodontic treatment
Poor oral hygiene
Dental/congenital anomalies ex: Missing laterals, transposed canines, Cleft lip and palate/craniofacial syndromes
Poor finishing criteria (ABO grading system)
Parallel
combined protocol of retention (bonded lingual retainer and vacuum formed retainers)
Procedure/SurgeryCombined bonded retainer and vacuum formed retainer
Bonded lingual retainer
Procedure/SurgeryBonded retainer
Mandibular anterior segment alignment
Using 3D models, mandibular anterior segment alignment will be measured by little irregularity index
Maxillary anterior segment alignment
Using 3D models, maxillary anterior segment alignment will be measured by little irregularity index
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