Orthodontic reduction of increased overbite
Research type
Research Study
Full title
Orthodontic reduction of an increased overbite in adolescents - the mechanism and rate of occlusal adaptation
IRAS ID
198519
Contact name
Grant McIntyre
Contact email
Duration of Study in the UK
2 years, 0 months, 1 days
Research summary
The overbite measures the vertical overlap of the upper and lower incisors with the teeth in occlusion (biting together). Where there is more overlap than one third this is termed an increased or deep overbite.
The correction of a deep overbite is assumed to involve incisor intrusion and the extrusion or eruption of premolars and molars. The latter is also assumed to be the major contributor for growing patients where the vertical facial growth increase accommodates for the additional eruption of posterior teeth with anterior bite plane appliances (appliance which props the bite open at the front).In this study the nature and rate of adaptation of the occlusal changes following insertion of a fixed anterior bite plane for the reduction of a deep overbite in growing patients will be investigated.
Subjects will be recruited from the Tayside population who have been referred to the Orthodontic Department at Dundee Dental Hospital. Subjects will be selected from new patient clinics and treatment waiting list who are assessed as having an increased overbite.
An intra-oral scanner will be used to accurately record the occlusal relationships prior to insertion of the fixed anterior bite plane (T0) and repeated immediately after placement (T1). Clinical photographs, stereophotogrammetry (3D photography) and a baseline radiograph (lateral cephalogram) will also be recorded. Each subject will then have the intra-oral scan, photographs and stereophotogrammetry repeated on a six weekly basis for a period of six months (T2-T5). A final lateral cephalogram will be taken at T5.
A control group of subjects from the treatment waiting list who meet the inclusion criteria will be used. An intra-oral scanner will record the baseline occlusal relationship at T0. Clinical photographs, stereophotogrammetry and a baseline radiograph (lateral cephalogram) will also be recorded. At T5 they will return for repeat intra-oral scan, photographs and stereophotogrammetry.
REC name
East of Scotland Research Ethics Service REC 2
REC reference
16/ES/0086
Date of REC Opinion
2 Sep 2016
REC opinion
Further Information Favourable Opinion