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Effect of compressive forces on a bone modelling surface.

T Steimetz1, P M Mandalunis, A M Ubios

  • 1Department of Oral Pathology, Department of Histology and Embriology, Faculty of Dentistry, University of Buenos Aires.

Acta Odontologica Latinoamericana : AOL
|January 1, 1997
PubMed
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Orthodontic appliances applying pressure can stimulate bone resorption. This study shows that compressive forces, even on bone modeling surfaces, activate osteoblasts to recruit osteoclasts, influencing bone remodeling.

Area of Science:

  • Orthodontics
  • Bone Biology
  • Biomaterials

Background:

  • Orthodontic appliances aim to move teeth by applying controlled forces.
  • Understanding bone remodeling in response to orthodontic forces is crucial for treatment efficacy.
  • The natural tendency of teeth is vestibular drift, necessitating palatal forces for correction.

Purpose of the Study:

  • To investigate the effect of palatally directed forces from a helicoidal spring orthodontic appliance on bone remodeling.
  • To examine bone resorption and osteoclast activity in response to compressive forces on the palatine alveolar bone.
  • To determine if compressive forces can stimulate bone remodeling on modeling surfaces.

Main Methods:

  • An experimental study using Wistar rats (250g body weight).

Related Experiment Videos

  • An orthodontic appliance with a helicoidal spring exerting palatal force was fitted for 48 and 96 hours.
  • Tetracycline hydrochloride labeling was used to identify mineralizing fronts; histomorphometric studies analyzed bone resorption and osteoclast numbers.

    • Main Results:

    • A significant increase in bone resorption was observed on the palatine alveolar bone at both 48 and 96 hours.
    • An increased number of osteoclasts were present in the experimental group.
    • No tetracycline labeling was observed at 48 hours, indicating active resorption rather than initial mineralization.

    Conclusions:

    • Compressive forces generated by orthodontic appliances can effectively stimulate bone resorption.
    • Bone remodeling occurs even on modeling surfaces in response to applied pressure.
    • Osteoblasts play a role in signaling for osteoclast recruitment and activity under compressive forces.