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Related Experiment Video

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Analysis of Developing Tooth Germ Innervation Using Microfluidic Co-culture Devices
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Interactions of the tooth and bone during development.

S A Alfaqeeh1, M Gaete, A S Tucker

  • 1Department of Craniofacial Development and Stem Cell Biology, Department of Orthodontics, King's College London, London, UK, SE1 9RT.

Journal of Dental Research
|October 25, 2013
PubMed
Summary

The developing tooth and alveolar bone maintain a critical space, the tooth-bone interface, regulated by osteoclasts. This space ensures proper tooth and periodontal tissue development by controlling tooth germ expansion.

Keywords:
RANK/RANKLankylosisdental follicleodontogenesisosteoclastsperiodontium-gingiva

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Area of Science:

  • Developmental Biology
  • Craniofacial Development
  • Periodontology

Background:

  • Tooth and alveolar bone growth are coordinated, maintaining a specific distance known as the tooth-bone interface (TBI).
  • The TBI's lack of mineralization is crucial for tooth and periodontal tissue development.

Purpose of the Study:

  • To investigate the interactions between the developing tooth and surrounding alveolar bone.
  • To determine the impact of alveolar bone development on the first molar (M1) in mice.

Main Methods:

  • Studied TRAP-positive osteoclasts at the TBI during mouse M1 development.
  • Manipulated RANK-RANKL signaling to enhance osteoclastogenesis.
  • Isolated M1 from surrounding tissues to assess growth regulation.

Main Results:

  • Osteoclasts are present at the TBI, removing bone as the tooth expands.
  • Enhanced osteoclastogenesis expanded the TBI, confirming osteoclasts' role in defining its size.
  • Isolation of M1 led to increased tooth germ expansion and proliferation, indicating constraint by surrounding tissues.

Conclusions:

  • Osteoclasts are essential for regulating the tooth-bone interface size during development.
  • Alveolar bone and surrounding tissues constrain tooth germ growth, ensuring coordinated development.