Scanning electron microscopy evaluation of dentin ultrastructure after surface demineralization

Area of Science:

• Dental Biomaterials Science
• Microstructural Analysis
• Surface Chemistry

Background:

• Understanding dentin microstructure is crucial for successful clinical procedures involving material adhesion.
• Dentin's complex structure influences bonding efficacy.

Purpose of the Study:

• To investigate the effects of varying hydrochloric acid (HCl) concentrations on dentin ultrastructure using scanning electron microscopy (SEM).
• To compare the demineralization patterns induced by 6 M and 12 M HCl.

Main Methods:

• Dentin segments were prepared and divided into two groups (n=10 each).
• Groups were demineralized with either 6 M or 12 M HCl.
• Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy were used for analysis.

Main Results:

• 6 M HCl caused partial demineralization, exposing peritubular dentin and slightly magnifying tubule openings.
• 12 M HCl resulted in more aggressive demineralization, erosion, and detachment of dentin layers, with significant tubule opening magnification.
• Both concentrations revealed similar chemical composition between tubular and intertubular dentin; lamina limitans was absent.

Conclusions:

• Dentin demineralization by HCl is concentration-dependent.
• Increased HCl molarity leads to greater peritubular dentin exposure and tubule opening enlargement.