Introduction: The objective of this study was to evaluate the long-term effectiveness in a group treated with the FR-2 appliance of Frankel compared with an untreated Class II control group. Methods: The sample consisted of 30 patients (17 boys, 13 girls) treated exclusively with the FR-2 by Rolf Frankel. The mean age at the start of treatment was 8 years (T1), with a posttreatment cephalogram (T2) taken 10 years later. The control group included 20 subjects (11 boys, 9 girls) with untreated Class II malocclusion. Their mean ages at T1 and T2, and the mean times of observation, matched the treatment group closely. Lateral cephalograms were analyzed with a specific tracing regimen at both T1 and T2 in both groups. The Student t test was used to compare changes between the groups Results: The FR-2 group maintained stable correction of the initial Class II malocclusion over the evaluation period. Significant mandibular and intermaxillary changes and dentoalveolar changes were noted in the treated group, with a 3-mm long-term increase in mandibular length compared with the untreated Class II controls. Conclusions: This study suggests that correction of a Class II malocclusion with the FR-2 appliance maintains favorable results over the long term with both skeletal and dentoalveolar changes.
Long-term treatment effects of the FR-2 appliance of Frankel / D. C. Freeman;J. A. McNamara;T. Baccetti;L. Franchi;C. Frankel. - In: AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS. - ISSN 0889-5406. - ELETTRONICO. - 135:(2009), pp. 0-0. [10.1016/j.ajodo.2007.11.029]
Long-term treatment effects of the FR-2 appliance of Frankel
BACCETTI, TIZIANO;FRANCHI, LORENZO;
2009
Abstract
Introduction: The objective of this study was to evaluate the long-term effectiveness in a group treated with the FR-2 appliance of Frankel compared with an untreated Class II control group. Methods: The sample consisted of 30 patients (17 boys, 13 girls) treated exclusively with the FR-2 by Rolf Frankel. The mean age at the start of treatment was 8 years (T1), with a posttreatment cephalogram (T2) taken 10 years later. The control group included 20 subjects (11 boys, 9 girls) with untreated Class II malocclusion. Their mean ages at T1 and T2, and the mean times of observation, matched the treatment group closely. Lateral cephalograms were analyzed with a specific tracing regimen at both T1 and T2 in both groups. The Student t test was used to compare changes between the groups Results: The FR-2 group maintained stable correction of the initial Class II malocclusion over the evaluation period. Significant mandibular and intermaxillary changes and dentoalveolar changes were noted in the treated group, with a 3-mm long-term increase in mandibular length compared with the untreated Class II controls. Conclusions: This study suggests that correction of a Class II malocclusion with the FR-2 appliance maintains favorable results over the long term with both skeletal and dentoalveolar changes.File | Dimensione | Formato | |
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