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Orthodontically induced root resorption in rat molars after 1-hydroxyethylidene-1,1-bisphosphonate injection
I Alatli1, E Hellsing, L Hammarström
1Department of Oral Pathology, Faculty of Odontology, Karolinska Institute, Huddinge, Sweden.
Acta Odontologica Scandinavica
|April 1, 1996
Summary
A bisphosphonate injection prevented acellular cementum formation in rat molars, leading to atypical cementum. This abnormal cementum was readily resorbed under orthodontic force, offering insights into hard-tissue resorption processes.
Area of Science:
- Dental Research
- Biomineralization
- Orthodontics
Background:
- Acellular cementum is crucial for tooth anchorage.
- Bisphosphonates are known to affect bone metabolism.
- The role of atypical cementum in root resorption is not well understood.
Purpose of the Study:
- To investigate the effect of 1-hydroxyethylidene-1,1-bisphosphonate on cementum formation.
- To evaluate the resorption resistance of atypically formed cementum under orthodontic force.
Main Methods:
- Administration of a single injection of 1-hydroxyethylidene-1,1-bisphosphonate in rat molars.
- Application of orthodontic force to induce root resorption.
- Microscopic analysis of cementum formation and resorption patterns.
Main Results:
- 1-hydroxyethylidene-1,1-bisphosphonate inhibited acellular cementum formation.
- Atypical hyperplastic cementum was formed in place of acellular cementum.
- Roots with atypical cementum showed significant resorption under orthodontic force.
Conclusions:
- Inhibition of acellular cementum by bisphosphonates leads to a more resorptive phenotype.
- Atypical hyperplastic cementum is susceptible to resorption, even without increased osteoblast activity.
- This model provides a valuable tool for studying hard-tissue resorption mechanisms.