Unit:
Speciality OrthodonticsΒιβλιοθήκη Οδοντιατρικής
Supervisors info:
Βασταρδή Ελένη, Αναπληρώτρια Καθηγήτρια, Τμήμα Οδοντιατρικής, Σχολή Επιστημών Υγείας, ΕΚΠΑ
Σηφακάκης Ιωσήφ, Αναπληρωτής Καθηγητής, Τμήμα Οδοντιατρικής, Σχολή Επιστημών Υγείας, ΕΚΠΑ
Χαλαζωνίτης Δημήτριος, Καθηγητής, Τμήμα Οδοντιατρικής, Σχολή Επιστημών Υγείας, ΕΚΠΑ
Original Title:
Cervical headgear effectiveness in distalizing molars in relation to patient compliance.
Translated title:
Cervical headgear effectiveness in distalizing molars in relation to patient compliance.
Summary:
Objectives: The purpose of this study was to measure the effectiveness of the cervical headgear for distalizing first permanent maxillary molars in relation to hours of use.
Methods: This was a one-centre, prospective, clinical study, conducted at the Orthodontic Department of the National and Kapodistrian University of Athens. Participants (N=26; 17 females, 9 males) were patients with no history of orthodontic treatment, no syndromes or clefts, and Angle’s Class II malocclusion where the treatment plan included a cervical headgear. They were instructed to wear the appliance for at least 12 hours per day. A TheraMon® microsensor was embedded in the headgear's strap to objectively measure wear-time. To measure tooth movement, pre- and post-treatment digital models were superimposed, using the palate as a reference area; translation and rotation were measured along three axes. Superimposition and movement measurements were made with the Viewbox 4 software.
Results: Average treatment time and headgear wear was 130 days and 55 days respectively, i.e., 10.1 hours/day. During this period, distal movement averaged 1.75 mm with high variability (min 0.2 mm, max 4.5 mm). Distal tipping and rotation had an average of approximately 5 degrees. Cumulative headgear wear was significantly correlated with distal movement (r-squared 0.32, P < 0.002), distal tipping (r-squared 0.27, P < 0.01) and distal rotation around the long axis of the tooth (r-squared 0.20, P < 0.05).
Conclusion: Compliance is critical for having a successful clinical outcome. Distalization of the molar with a cervical headgear is correlated with the cumulative hours of appliance use, with hours per day being a weaker predictor.
Main subject category:
Health Sciences
Keywords:
Headgear, Distalization, Compliance
