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Condylar growth and mandibular positioning with stepwise vs maximum advancement.
Am J Orthod Dentofacial Orthop. 2008 Oct; 134(4):525-36.AJ

Abstract

INTRODUCTION

The aim of this study was to compare the effects of several Class II malocclusion treatments on condylar growth and positioning of the mandible.

METHODS

The material comprised series of lateral cephalograms obtained at the start, after about 6 months, and after about 12 months of treatment from 3 groups of consecutively treated patients who used a headgear-activator with stepwise mandibular advancement (HGA-S), a headgear-activator with maximum jumping of the mandible (HGA-M), and a headgear-Herbst appliance with stepwise advancement (HGH-S), respectively. Six-month growth data from matched controls were used to calculate the net treatment effects.

RESULTS

Mandibular prognathism was enhanced after stepwise advancement but not after maximum jumping, and only during the initial phase of therapy; the effect was significantly greater for the fixed functional appliance than for the removable functional appliance. Lower-facial height was increased by the HGA-S, unchanged by the HGA-M, and restrained by the HGH-S. The low construction bite of the HGH-S meant that the extent of bone apposition on the posterior and superior parts of the condyle was similar, whereas the high construction bite of the HGA-S and the HGA-M meant that the effect on the superior part was greater, but only significantly so after stepwise advancement.

CONCLUSIONS

The mode of jumping, the vertical opening, and whether the functional appliance is fixed or removable affect the amount and pattern of condylar growth, and the position of the mandible.

Links

Publisher Full Text (DOI)

Authors+Show Affiliations

Hägg U
Department of Orthodontics, University of Hong Kong, Hong Kong. euohagg@hkusua.hku.hk
Rabie AB
No affiliation info available
Bendeus M
No affiliation info available
Wong RW
No affiliation info available
Wey MC
No affiliation info available
Du X
No affiliation info available
Peng J
No affiliation info available

MeSH

AdolescentCephalometryChildExtraoral Traction AppliancesFemaleHumansMaleMalocclusion, Angle Class IIMandibleMandibular AdvancementMandibular CondyleOrthodontic Appliances, FunctionalProspective StudiesTreatment Outcome

Pub Type(s)

Controlled Clinical Trial
Journal Article

Language

eng

PubMed ID

18929270

Clinical Trial Links

Dentoskeletal Changes Associated With Herbst Appliance Therapy

Citation

Hägg, Urban, et al. "Condylar Growth and Mandibular Positioning With Stepwise Vs Maximum Advancement." 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. 134, no. 4, 2008, pp. 525-36.
Hägg U, Rabie AB, Bendeus M, et al. Condylar growth and mandibular positioning with stepwise vs maximum advancement. Am J Orthod Dentofacial Orthop. 2008;134(4):525-36.
Hägg, U., Rabie, A. B., Bendeus, M., Wong, R. W., Wey, M. C., Du, X., & Peng, J. (2008). Condylar growth and mandibular positioning with stepwise vs maximum advancement. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 134(4), 525-36. https://doi.org/10.1016/j.ajodo.2006.09.064
Hägg U, et al. Condylar Growth and Mandibular Positioning With Stepwise Vs Maximum Advancement. Am J Orthod Dentofacial Orthop. 2008;134(4):525-36. PubMed PMID: 18929270.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Condylar growth and mandibular positioning with stepwise vs maximum advancement. AU - Hägg,Urban, AU - Rabie,A Bakr M, AU - Bendeus,Margareta, AU - Wong,Ricky W K, AU - Wey,Mang Chek, AU - Du,Xi, AU - Peng,Jasmine, PY - 2006/07/01/received PY - 2006/09/01/revised PY - 2006/09/01/accepted PY - 2008/10/22/pubmed PY - 2008/11/6/medline PY - 2008/10/22/entrez SP - 525 EP - 36 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 - 134 IS - 4 N2 - INTRODUCTION: The aim of this study was to compare the effects of several Class II malocclusion treatments on condylar growth and positioning of the mandible. METHODS: The material comprised series of lateral cephalograms obtained at the start, after about 6 months, and after about 12 months of treatment from 3 groups of consecutively treated patients who used a headgear-activator with stepwise mandibular advancement (HGA-S), a headgear-activator with maximum jumping of the mandible (HGA-M), and a headgear-Herbst appliance with stepwise advancement (HGH-S), respectively. Six-month growth data from matched controls were used to calculate the net treatment effects. RESULTS: Mandibular prognathism was enhanced after stepwise advancement but not after maximum jumping, and only during the initial phase of therapy; the effect was significantly greater for the fixed functional appliance than for the removable functional appliance. Lower-facial height was increased by the HGA-S, unchanged by the HGA-M, and restrained by the HGH-S. The low construction bite of the HGH-S meant that the extent of bone apposition on the posterior and superior parts of the condyle was similar, whereas the high construction bite of the HGA-S and the HGA-M meant that the effect on the superior part was greater, but only significantly so after stepwise advancement. CONCLUSIONS: The mode of jumping, the vertical opening, and whether the functional appliance is fixed or removable affect the amount and pattern of condylar growth, and the position of the mandible. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/18929270/Condylar_growth_and_mandibular_positioning_with_stepwise_vs_maximum_advancement_ DB - PRIME DP - Unbound Medicine ER -