ABSTRACT
Objectives:The purpose of this clinical prospective study was to compare the dentofacial
changes produced by the Sabbagh Universal Spring (SUS²) and Forsus FRD appliances
in late adolescent patients with Class II malocclusion, and quantify them in comparison
with an untreated group.
Methods: The study was carried out on 59 patients with skeletal and dental Class II
malocclusion due to retrognatic mandible. Among these, 20 were treated with SUS²,
20 were treated with FRD, and no treatment was done to 19 subjects as the control
group. 36 cephalometric landmarks were identified on each lateral cephalometric radiograph.
Results:The effects of both appliances were dentoalveolar and no significant vertical
and sagittal skeletal effect on maxilla and mandible was achieved. The retrusion and
extrusion of the maxillary incisors as well as the protrusion and intrusion of mandibular
incisors were found to be statistically significant in both treatment groups. Soft
tissue profile improvement was limited in both treatment groups.
Conclusions: Both appliances corrected Class II discrepancies through dentoalveolar
changes; however lower incisor proclination was more prominent with the Forsus FRD.
(Eur J Dent 2012;6:302- 310)
Key words
Sabbagh Universal Spring (SUS²) - Forsus FRD - functional therapy - late adolescence