OBJECTIVE: The present study describes dental arch changes in patients with an Angle Class II, Division 1 malocclusion and skeletal Class II during orthodontic treatment during which only jumping-the-bite appliances according to the Hannover design were used. PATIENTS AND METHODS: 69 patients (37 female and 32 male) were treated with jumping-the-bite appliances. The measurements taken in upper and lower jaws were: length of the anterior arch and E-space, anterior and posterior arch width, overjet and overbite. Analyses of dental casts prior to treatment and after each year of treatment were carried out until the end of treatment. Statistical analysis included mean value, standard deviation and t test for paired groups for all measurements. RESULTS: Anterior arch length increased in all patients, indicating a protrusion of incisors, especially in the lower arch. The anterior and in particular, posterior arch widths of the upper and lower jaws also increased, whereas E-space was reduced. The overjet decreased in terms of physiological values, as did the overbite, but to a lesser extent. CONCLUSION: In addition to causing skeletal changes, treatment with jumping-the-bite appliances also leads to characteristic dentoalveolar changes. These factors must be considered when planning the therapy of patients with Angle Class II, Division I malocclusion.
OBJECTIVE: The present study describes dental arch changes in patients with an Angle Class II, Division 1 malocclusion and skeletal Class II during orthodontic treatment during which only jumping-the-bite appliances according to the Hannover design were used. PATIENTS AND METHODS: 69 patients (37 female and 32 male) were treated with jumping-the-bite appliances. The measurements taken in upper and lower jaws were: length of the anterior arch and E-space, anterior and posterior arch width, overjet and overbite. Analyses of dental casts prior to treatment and after each year of treatment were carried out until the end of treatment. Statistical analysis included mean value, standard deviation and t test for paired groups for all measurements. RESULTS: Anterior arch length increased in all patients, indicating a protrusion of incisors, especially in the lower arch. The anterior and in particular, posterior arch widths of the upper and lower jaws also increased, whereas E-space was reduced. The overjet decreased in terms of physiological values, as did the overbite, but to a lesser extent. CONCLUSION: In addition to causing skeletal changes, treatment with jumping-the-bite appliances also leads to characteristic dentoalveolar changes. These factors must be considered when planning the therapy of patients with Angle Class II, Division I malocclusion.
Authors: Jörg Alexander Lisson; Kay Mokrys; Gero Stefan Michael Kinzinger; Bettina Glasl; Björn Ludwig Journal: J Orofac Orthop Date: 2013-03-07 Impact factor: 1.938