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Effects of the pendulum appliance, cervical headgear, and 2 premolar extractions followed by fixed appliances in patients with Class II malocclusion.
Am J Orthod Dentofacial Orthop. 2009 Dec; 136(6):833-42.AJ

Abstract

INTRODUCTION

In this retrospective study, we compared the cephalometric effects, the dental-arch changes, and the efficiency of Class II treatment with the pendulum appliance, cervical headgear, or extraction of 2 maxillary premolars, all associated with fixed appliance therapy.

METHODS

The sample of 82 patients with Class II malocclusion was divided into 3 groups: group 1 patients (n = 22; treatment time, 3.8 years) were treated with the pendulum appliance and fixed orthodontic appliances. Group 2 patients (n = 30; treatment time, 3.2 years) were treated with cervical headgear followed by fixed appliances; group 3 patients (n = 30; treatment time, 2.1 years) were treated with 2 maxillary premolar extractions and fixed appliances. The average starting ages of the groups ranged from 13.2 to 13.8 years. Data were obtained from serial cephalometric measurements and dental casts. The dental casts were analyzed with the treatment priority index. The treatment efficiency index was also used.

RESULTS

The 3 treatment protocols produced similar cephalometric effects, especially skeletally. Comparisons among the 2 distalizing appliances (pendulum and cervical headgear) and extraction of 2 maxillary premolars for Class II treatment showed changes primarily in the maxillary dentoalveolar component and dental relationships. The facial profile was similar after treatment, except for slightly more retrusion of the upper lip in the extraction patients. The treatment priority index demonstrated that occlusal outcomes also were similar among the groups. The treatment efficiency index had higher values for the extraction group.

CONCLUSIONS

The effects of treatment with the pendulum appliance or cervical headgear and extraction of 2 maxillary premolars associated with fixed appliances were similar from both occlusal and cephalometric standpoints. Class II treatment with extraction of maxillary teeth was more efficient because of the shorter treatment time. Differences in maxillary incisor retraction should be noted, but these differences might have been due to greater maxillary dentoalveolar protrusion in the extraction group before treatment.

Authors+Show Affiliations

Department of Orthodontics, Bauru Dental School, University of São Paulo, São Paulo, Brazil.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

19962606

Citation

de Almeida-Pedrin, Renata Rodrigues, et al. "Effects of the Pendulum Appliance, Cervical Headgear, and 2 Premolar Extractions Followed By Fixed Appliances in Patients With Class II Malocclusion." 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. 136, no. 6, 2009, pp. 833-42.
de Almeida-Pedrin RR, Henriques JF, de Almeida RR, et al. Effects of the pendulum appliance, cervical headgear, and 2 premolar extractions followed by fixed appliances in patients with Class II malocclusion. Am J Orthod Dentofacial Orthop. 2009;136(6):833-42.
de Almeida-Pedrin, R. R., Henriques, J. F., de Almeida, R. R., de Almeida, M. R., & McNamara, J. A. (2009). Effects of the pendulum appliance, cervical headgear, and 2 premolar extractions followed by fixed appliances in patients with Class II malocclusion. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 136(6), 833-42. https://doi.org/10.1016/j.ajodo.2007.12.032
de Almeida-Pedrin RR, et al. Effects of the Pendulum Appliance, Cervical Headgear, and 2 Premolar Extractions Followed By Fixed Appliances in Patients With Class II Malocclusion. Am J Orthod Dentofacial Orthop. 2009;136(6):833-42. PubMed PMID: 19962606.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of the pendulum appliance, cervical headgear, and 2 premolar extractions followed by fixed appliances in patients with Class II malocclusion. AU - de Almeida-Pedrin,Renata Rodrigues, AU - Henriques,José Fernando Castanha, AU - de Almeida,Renato Rodrigues, AU - de Almeida,Marcio Rodrigues, AU - McNamara,James A,Jr PY - 2007/06/01/received PY - 2007/12/01/revised PY - 2007/12/01/accepted PY - 2009/12/8/entrez PY - 2009/12/8/pubmed PY - 2009/12/23/medline SP - 833 EP - 42 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 - 136 IS - 6 N2 - INTRODUCTION: In this retrospective study, we compared the cephalometric effects, the dental-arch changes, and the efficiency of Class II treatment with the pendulum appliance, cervical headgear, or extraction of 2 maxillary premolars, all associated with fixed appliance therapy. METHODS: The sample of 82 patients with Class II malocclusion was divided into 3 groups: group 1 patients (n = 22; treatment time, 3.8 years) were treated with the pendulum appliance and fixed orthodontic appliances. Group 2 patients (n = 30; treatment time, 3.2 years) were treated with cervical headgear followed by fixed appliances; group 3 patients (n = 30; treatment time, 2.1 years) were treated with 2 maxillary premolar extractions and fixed appliances. The average starting ages of the groups ranged from 13.2 to 13.8 years. Data were obtained from serial cephalometric measurements and dental casts. The dental casts were analyzed with the treatment priority index. The treatment efficiency index was also used. RESULTS: The 3 treatment protocols produced similar cephalometric effects, especially skeletally. Comparisons among the 2 distalizing appliances (pendulum and cervical headgear) and extraction of 2 maxillary premolars for Class II treatment showed changes primarily in the maxillary dentoalveolar component and dental relationships. The facial profile was similar after treatment, except for slightly more retrusion of the upper lip in the extraction patients. The treatment priority index demonstrated that occlusal outcomes also were similar among the groups. The treatment efficiency index had higher values for the extraction group. CONCLUSIONS: The effects of treatment with the pendulum appliance or cervical headgear and extraction of 2 maxillary premolars associated with fixed appliances were similar from both occlusal and cephalometric standpoints. Class II treatment with extraction of maxillary teeth was more efficient because of the shorter treatment time. Differences in maxillary incisor retraction should be noted, but these differences might have been due to greater maxillary dentoalveolar protrusion in the extraction group before treatment. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/19962606/Effects_of_the_pendulum_appliance_cervical_headgear_and_2_premolar_extractions_followed_by_fixed_appliances_in_patients_with_Class_II_malocclusion_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(09)00779-3 DB - PRIME DP - Unbound Medicine ER -