Condyle-fossa modifications and muscle interactions during herbst treatment, part 1. new technological methods

Changes in the condyle, the glenoid fossa, and the muscles of mastication were investigated in subjects undergoing continuous orthopedic advancement of the mandible with a Herbst-block appliance. The total sample consisted of 56 subjects and included 15 nonhuman primates (in the middle mixed, early...

Full description

Saved in:
Bibliographic Details
Published in:American journal of orthodontics and dentofacial orthopedics 2003-06, Vol.123 (6), p.604-613
Main Authors: Voudouris, John C, Woodside, Donald G, Altuna, Gurkan, Kuftinec, Mladen M, Angelopoulos, Gerassimos, Bourque, Paul J
Format: Article
Language:English
Subjects:
Animals
Case-Control Studies
Cephalometry
Child
Dentistry
Electromyography - instrumentation
Female
Fluorescent Dyes
Humans
Macaca fascicularis
Male
Mandibular Advancement - instrumentation
Mandibular Condyle - growth & development
Mandibular Condyle - physiopathology
Masseter Muscle - growth & development
Masseter Muscle - physiopathology
Masticatory Muscles - growth & development
Masticatory Muscles - physiopathology
Neck Muscles - growth & development
Neck Muscles - physiopathology
Orthodontic Appliances, Functional
Osteogenesis - physiology
Pterygoid Muscles - growth & development
Pterygoid Muscles - physiopathology
Statistics, Nonparametric
Technology, Dental
Temporal Bone - growth & development
Temporal Bone - physiopathology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Changes in the condyle, the glenoid fossa, and the muscles of mastication were investigated in subjects undergoing continuous orthopedic advancement of the mandible with a Herbst-block appliance. The total sample consisted of 56 subjects and included 15 nonhuman primates (in the middle mixed, early permanent, and permanent dentitions), 17 human Herbst patients in the early permanent dentition, and 24 human controls from the Burlington Growth Center. The 8 nonhuman primates in the middle mixed dentition were the focus of this study. Mandibular advancement was obtained progressively in 5 animals by adding stops to the telescopic arms of fixed functional Herbst appliances with occlusal coverage; activations of 5.0 mm, 7.0 mm, and 8.0 mm were achieved. Two primates served as controls, and the third was a sham control. Two experimental animals and the 2 controls also wore surgically implanted electromyographic electrodes in the superior and inferior heads of the lateral pterygoid muscles and in the superficial masseter and anterior digastric muscles. Changes in condylar growth direction and amount were assessed with the Björk method from measurements made on serial cephalometric tracings superimposed on metallic implants. Undecalcified sections, treated with intravenous tetracycline vital staining, were viewed with fluorescence microscopy to examine histologic changes in the condyle and the glenoid fossa. New bone formation in the fossa associated with continuous mandibular protrusion was quantified by using computerized histomorphometric analysis of decalcified histological sections and polarized light. The unique combination of permanently implanted electromyographic electrodes, tetracycline vital staining, and histomorphometry represents a significant technological advancement in methods and materials. Together, they demonstrated different muscle-bone interaction results for functional appliances than those reported in previous studies. In Part 1 of this study, we describe and discuss the techniques used in this research and give a brief overview of the findings; in Part 2 (to be published next month), we offer a more in-depth discussion of the results and the implications of our findings.
ISSN:0889-5406
1097-6752
DOI:10.1016/S0889-5406(03)00149-5