Arch changes after Class II, Division 1 treatment with jumping-the-bite appliances.
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.


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.


CONCLUSIONS
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.
Stec-Slonicz
Magdalena
M
University Hospital Saarland, Department of Orthodontics, Homburg/Saar, Germany. magdalena.stec-slonicz@uks.eu
Weindel
Sabine
S
Paurevic
Sandra
S
Lisson
Jörg A
JA
D002508:Cephalometry; D003724:Dental Arch; D003735:Dental Casting Technique; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D016382:Orthodontic Appliance Design; D017289:Orthodontic Appliances, Functional