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Odontoblast dysfunction in osteogenesis imperfecta: an LM, SEM, and ultrastructural study.
R K Hall1, M C Manière, J Palamara
1University of Melbourne, Royal Children's Hospital, Melbourne, Australia. rkingsh@ozemail.com.au
Connective Tissue Research
|December 20, 2002
Summary
Dentinogenesis imperfecta (DI), a dental defect in osteogenesis imperfecta (OI), presents varying severity in all OI children. This study details DI
Area of Science:
- Oral Biology
- Genetics
- Biomineralization
Background:
- Dentinogenesis imperfecta (DI) is an inherited dentin defect.
- DI is now recognized in all children with osteogenesis imperfecta (OI), exhibiting a spectrum of severity.
- Previous understanding linked clinically obvious DI to specific OI types.
Purpose of the Study:
- To elucidate the structural and ultrastructural dentin changes in children with OI and clinically apparent DI.
- To correlate these observed dentin abnormalities with odontoblast dysfunction.
- To provide a comprehensive understanding of DI within the context of OI.
Main Methods:
- Collaborative research conducted in Melbourne and Strasbourg.
- Utilized light and polarized-light microscopy.
- Employed scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected-area diffraction (SAD), and energy-dispersive X-ray spectroscopy (EDX).
Main Results:
- Enamel structure was normal, though containing long and broad lamellae.
- The dentino-enamel junction (DEJ) was normally scalloped.
- Severe pathological changes in dentin included a narrow band of normal tubules followed by a laminar zone with occluded tubules and unique parallel channels.
- Abnormal dentin significantly reduced pulp chamber volume.
Conclusions:
- Observed dentin structural and ultrastructural changes are attributable to odontoblast dysfunction.
- This dysfunction stems from the underlying collagen defect in osteogenesis imperfecta.
- DI in OI exhibits a distinct phenotype compared to bone abnormalities in OI.