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Microhardness Measurements on Tooth and Alveolar Bone in Rodent Oral Disease Models
Published on: April 26, 2024
Short-term PTH administration increases dentine apposition and microhardness in mice
Gustavo Narvaes Guimarães1, Guinéa Brasil Camargo Cardoso, Lucas Zago Naves
1Department of Morphology, Division of Histology, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil.
Archives of Oral Biology
|April 25, 2012
Summary
Intermittent parathyroid hormone (PTH) treatment boosts dentine formation and mineralization in young mice incisors. This study shows increased apposition rates and improved dentine hardness and composition with PTH administration.
Area of Science:
- Biomineralization
- Dental Research
- Endocrinology
Background:
- Dentine formation is crucial for tooth integrity.
- Parathyroid hormone (PTH) is a key regulator of calcium and phosphate homeostasis.
- Understanding PTH's role in dentine development can inform therapeutic strategies.
Purpose of the Study:
- To investigate the impact of intermittent human parathyroid hormone (hPTH 1-34) on dentine apposition rate.
- To analyze structural and compositional changes in dentine following PTH administration.
- To evaluate the effects on alkaline phosphatase (ALP) levels and microhardness.
Main Methods:
- Daily administration of hPTH 1-34 or vehicle to young male A/J Unib mice for 6 and 10 days.
- Measurement of dentine apposition rates using fluorescent labels (tetracycline, calcein).
- Analysis of plasma ALP levels, Knoop microhardness, and elemental composition (Ca, P, O, Mg) via SEM-EDX.
Main Results:
- PTH treatment increased dentine apposition rate by 5% and plasma ALP levels by 25%.
- Microhardness of dentine increased by 11% in the PTH-treated group.
- Peritubular dentine showed increased P (23%) and Ca (53%) content, with a 24% higher Ca/P ratio.
Conclusions:
- Intermittent hPTH (1-34) administration enhances dentine apposition and mineralization.
- PTH treatment positively influences dentine structural properties and elemental composition.
- Findings suggest PTH's potential role in promoting healthy incisor development.
