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Related Experiment Videos

Dentofacial changes produced by extraoral forward force in the Macaca irus.

T Kambara

    American Journal of Orthodontics
    |March 1, 1977
    PubMed
    Summary

    Extraoral forward force on Macaca irus monkeys significantly altered circum-maxillary sutures and maxillary tuberosity. Early application of this force promotes desirable skeletal changes for forward maxillary complex movement.

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    Area of Science:

    • Orthodontics
    • Craniofacial Biology
    • Dental Research

    Background:

    • Investigating the impact of extraoral forces on dentofacial skeletal growth is crucial for orthodontic advancements.
    • Understanding sutural responses to mechanical stimuli informs treatment strategies.

    Purpose of the Study:

    • To evaluate the effects of intermittent extraoral forward force on the craniofacial skeleton of Macaca irus monkeys.
    • To analyze changes in circum-maxillary sutures and maxillary tuberosity in response to applied force.

    Main Methods:

    • Application of intermittent extraoral forward force (300 Gm. per side) to eleven Macaca irus monkeys.
    • Analysis using model casts, cephalometric radiographs, tetracycline bone marking, microradiographs, and histologic preparations.

    Main Results:

    • Significant alterations observed in circum-maxillary sutures and maxillary tuberosity.
    • Desirable sutural reactions and forward positional changes with counterclockwise rotation of the maxillary complex noted in young monkeys.
    • Histological evidence of local reaction in adults, though less pronounced than in young subjects.

    Conclusions:

    • Intermittent extraoral forward force effectively induces changes in the craniofacial skeleton, particularly in younger individuals.
    • Early intervention to increase sutural activity is recommended for optimal forward maxillary complex movement.
    • Further research is needed to assess skeletal relapse following orthopedic treatment.

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