Document Detail

Stress distribution under high-pull extraoral chin cup traction. A photoelastic study.
MedLine Citation:
PMID:  6950682     Owner:  NLM     Status:  MEDLINE    
Birefringent materials were employed in the fabrication of a model of a human skull with distinct simulants for teeth, bone, and periodontal ligaments. The following observations were made subsequent to the application of force to this model with an extraoral high-pull chin cup: 1. Reciprocal stresses were observed in the posterior portion of the glenoid fossa and the contacting posterior part of the head of the condyle. 2. A tension coil spring representing the external pterygoid muscle applied reciprocal stresses at its insertions in the lateral pterygoid plate on the greater wing of the sphenoid and the anterior aspect of the head of the condyle. 3. Stresses were seen to radiate from the roots and apices of both the maxillary and mandibular posterior teeth. 4. A distinct concentration of stress was noted in the retromolar area of the mandible, away from the dentition, indicating a bending stress. 5. The posterior half of the sigmoid notch, below the anterior aspect of the head of the condyle, displayed a heavy band of stresses. 6. Selected sectioning of the mandible substantiated observations made from the intact hemimandible and also showed evidence of bending in the area corresponding to the head and neck of the condyle.
J Alfredo de Alba; S J Chaconas; A A Caputo; W Emison
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Angle orthodontist     Volume:  52     ISSN:  0003-3219     ISO Abbreviation:  Angle Orthod     Publication Date:  1982 Jan 
Date Detail:
Created Date:  1982-05-12     Completed Date:  1982-05-12     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0370550     Medline TA:  Angle Orthod     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  69-78     Citation Subset:  D; IM    
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MeSH Terms
Dental Stress Analysis / methods*
Extraoral Traction Appliances*
Facial Bones / physiology
Malocclusion, Angle Class III / therapy
Mandible / physiology
Models, Biological
Orthodontic Appliances, Removable*
Stress, Mechanical

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