Document Detail

Treatment and posttreatment effects of acrylic splint Herbst appliance therapy.
MedLine Citation:
PMID:  10194289     Owner:  NLM     Status:  MEDLINE    
This study evaluated the skeletal and dentoalveolar changes induced by acrylic splint Herbst therapy of Class II malocclusion. The treated group comprised 55 subjects with Class II malocclusion treated with the acrylic splint Herbst appliance followed by comprehensive edgewise therapy. The mean age at Time 1 (immediately before treatment) was 12 years and 10 months +/- 1 year and 2 months. The mean age at Time 2 (immediately after debonding of the Herbst appliance) and Time 3 (posttreatment) was 13 years and 10 months +/- 1 year and 2 months and 15 years and 2 months +/- 1 year and 4 months, respectively. The two control groups were one group of 30 subjects with untreated Class II malocclusion and another group of 33 subjects with Class I occlusion. The three groups were homogeneous as to the stage of maturation of cervical vertebrae at all observation times. A modification of Pancherz's cephalometric analysis was applied to the lateral cephalograms of the three groups at Time 1, Time 2, and Time 3. Linear and angular measurements for mandibular dimensions, cranial base angulation, and vertical relationships were added to the original analysis. Differences for all the variables from Time 1 to Time 2 (active treatment effects), from Time 2 to Time 3 (posttreatment effects), and from Time 1 to Time 3 (overall treatment effects) were calculated for the treated group and contrasted to corresponding differences of both untreated groups by means of ANOVA (P <.05). The study showed that two thirds of the achieved occlusal correction was due to skeletal effects and only one third to dentoalveolar adaptations. Both skeletal and dentoalveolar effects were due mainly to changes in mandibular structures. A significant amount of relapse in molar relationship occurred during the posttreatment period, and this change could be ascribed to the mesial movement of the upper molars.
L Franchi; T Baccetti; J A McNamara
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics     Volume:  115     ISSN:  0889-5406     ISO Abbreviation:  Am J Orthod Dentofacial Orthop     Publication Date:  1999 Apr 
Date Detail:
Created Date:  1999-05-06     Completed Date:  1999-05-06     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8610224     Medline TA:  Am J Orthod Dentofacial Orthop     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  429-38     Citation Subset:  D; IM    
Department of Orthodontics, The University of Florence, Italy.
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MeSH Terms
Acrylic Resins
Age Factors
Analysis of Variance
Case-Control Studies
Cervical Vertebrae / growth & development
Malocclusion, Angle Class II / therapy*
Mesial Movement of Teeth / physiopathology
Orthodontic Appliance Design
Orthodontic Appliances, Functional*
Orthodontics, Corrective / methods*
Outcome Assessment (Health Care)
Statistics, Nonparametric
Reg. No./Substance:
0/Acrylic Resins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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