Selenium anion substitution in hydroxyapatite: chemo-mechanical effects compared with root canal dentin.

Area of Science:

• Biomaterials Science
• Dental Materials
• Materials Chemistry

Background:

• Hydroxyapatite is a key component of natural dentin.
• Selenium's role in dentin properties is under investigation.
• Evaluating synthetic hydroxyapatite as a model for natural dentin is crucial.

Purpose of the Study:

• To assess selenium substitution effects on synthetic hydroxyapatite and natural dentin.
• To compare chemical and mechanical properties of synthetic vs. natural hydroxyapatite.
• To determine the suitability of synthetic hydroxyapatite as a dentin substitute.

Main Methods:

• Samples of natural dentin and synthesized hydroxyapatite were treated with selenium acid.
• Selenium content measured via ICP-MS.
• Vickers microhardness and solubility tests were conducted.

Main Results:

• Selenium concentrations were significantly higher in selenium-treated natural dentin compared to treated synthetic hydroxyapatite.
• Surface microhardness mirrored selenium concentration trends.
• Natural dentin exhibited significantly lower solubility.

Conclusions:

• Selenium levels correlate with dentin's mechanical properties.
• Synthesized hydroxyapatite may not accurately model natural dentin for fortification studies.
• Further research is needed to understand selenium's interaction with dentin.