[Microanalysis of salivary calculi]

Area of Science:

• Oral biology
• Biomineralization
• Dental research

Background:

• Salivary calculi (salivary stones) are calcified masses forming in salivary glands.
• Understanding their composition and formation is crucial for diagnosing and treating salivary gland diseases.

Purpose of the Study:

• To investigate the microstructural and chemical composition of salivary calculi.
• To identify different mineralized regions within the calculi and their characteristics.

Main Methods:

• Eight salivary calculi were sectioned and analyzed using microanalysis techniques.
• Scanning electron microscopy (SEM) was employed to examine the surface morphology.

Main Results:

• Three distinct regions were identified: a central, highly mineralized nucleus; a stratified, less mineralized middle region with a lower calcium/phosphorus (Ca/P) ratio; and a peripheral, weakly calcified outer region.
• Inclusions with high silicon or sulfur concentrations were noted but their role remains unclear.
• Filamentous mineralized bacteria were commonly observed on the external surface of the calculi.

Conclusions:

• Salivary calculi exhibit a complex, multi-regional structure with varying degrees of mineralization.
• The presence of mineralized bacteria on the surface suggests a potential role in calculus formation or modification.
• Further research is needed to elucidate the significance of silicon and sulfur inclusions in calculus genesis.