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Maxillary expansion in an animal model with light, continuous force.

Achint Utreja, Carol Bain, Brett Turek

    The Angle Orthodontist
    |January 25, 2018
    PubMed
    Summary

    This study explored light, continuous force for maxillary expansion in rats, finding it effectively widened the palate without adverse bone effects. This offers a more physiologic approach to treating maxillary constriction.

    Keywords:
    Maxillary expansionOrthodontic tooth movement

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    Area of Science:

    • Orthodontics and Dental Research
    • Craniofacial Biology
    • Biomaterials Science

    Background:

    • Maxillary constriction is commonly treated with rapid maxillary expansion (RME).
    • Traditional RME appliances utilize heavy forces, potentially causing adverse effects on teeth and supporting bone.
    • A need exists for a more physiologic approach to maxillary expansion.

    Purpose of the Study:

    • To investigate the efficacy and effects of light, continuous force for maxillary expansion.
    • To compare outcomes with traditional heavy-force RME methods.
    • To establish a more physiologic basis for palatal expansion.

    Main Methods:

    • A custom copper-nickel-titanium archwire appliance delivering 5 cN of light continuous force was used in Sprague-Dawley rats (experimental group).
    • Microfocus x-ray computed tomography and histological analyses assessed midpalatal suture and alveolar bone changes.
    • Comparison was made against a control group receiving no expansion treatment.

    Main Results:

    • Statistically significant increases in buccal tooth movement and midpalatal suture expansion were observed in the experimental group.
    • No significant differences in overall bone morphologic parameters were found between groups.
    • Increased mineral apposition rates were noted on the buccal surface of the alveolar process.

    Conclusions:

    • Light, continuous force successfully achieved maxillary osseous expansion through sutural apposition and alveolar bone drift.
    • This method provides a more physiologic alternative for maxillary expansion compared to conventional RME.
    • The findings support the use of light force systems for predictable and safe palatal expansion.