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Long-term treatment effects of the FR-2 appliance of Fränkel.
Am J Orthod Dentofacial Orthop. 2009 May; 135(5):570.e1-6; discussion 570-1.AJ

Abstract

INTRODUCTION

The objective of this study was to evaluate the long-term effectiveness in a group treated with the FR-2 appliance of Fränkel 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 Fränkel. 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.

Authors+Show Affiliations

University of Michigan, Ann Arbor, MI, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Controlled Clinical Trial
Journal Article

Language

eng

PubMed ID

19409337

Citation

Freeman, David C., et al. "Long-term Treatment Effects of the FR-2 Appliance of Fränkel." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 135, no. 5, 2009, pp. 570.e1-6; discussion 570-1.
Freeman DC, McNamara JA, Baccetti T, et al. Long-term treatment effects of the FR-2 appliance of Fränkel. Am J Orthod Dentofacial Orthop. 2009;135(5):570.e1-6; discussion 570-1.
Freeman, D. C., McNamara, J. A., Baccetti, T., Franchi, L., & Fränkel, C. (2009). Long-term treatment effects of the FR-2 appliance of Fränkel. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 135(5), e1-6; discussion 570-1. https://doi.org/10.1016/j.ajodo.2007.11.029
Freeman DC, et al. Long-term Treatment Effects of the FR-2 Appliance of Fränkel. Am J Orthod Dentofacial Orthop. 2009;135(5):570.e1-6; discussion 570-1. PubMed PMID: 19409337.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Long-term treatment effects of the FR-2 appliance of Fränkel. AU - Freeman,David C, AU - McNamara,James A,Jr AU - Baccetti,Tiziano, AU - Franchi,Lorenzo, AU - Fränkel,Christine, PY - 2007/09/20/received PY - 2007/11/20/revised PY - 2007/11/20/accepted PY - 2009/5/5/entrez PY - 2009/5/5/pubmed PY - 2009/5/19/medline SP - 570.e1-6; discussion 570-1 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 135 IS - 5 N2 - INTRODUCTION: The objective of this study was to evaluate the long-term effectiveness in a group treated with the FR-2 appliance of Fränkel 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 Fränkel. 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. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/19409337/Long_term_treatment_effects_of_the_FR_2_appliance_of_Fränkel_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(09)00165-6 DB - PRIME DP - Unbound Medicine ER -