Calcium and Microhardness Quantification in Healthy and Fluorotic Dentin Conditioned with a Self-Etching System: An...

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Restorative Dentistry

Background:

• Dental fluorosis alters dentin micromorphology, potentially compromising structural integrity.
• Demineralization during operative procedures can be affected by fluorosis-induced changes.
• Understanding these effects is crucial for successful dental restorations.

Purpose of the Study:

• To quantify calcium content and microhardness in healthy and fluorotic dentin.
• To evaluate the effects of a two-step self-etching system on these properties.
• To investigate the impact of fluorosis on dentin's response to conditioning.

Main Methods:

• Dentin samples from healthy and fluorosis-affected molars (mild, moderate, severe) were used.
• Calcium quantification via atomic absorption spectrophotometry.
• Microhardness assessment using Vickers durometry and SEM for etching patterns.

Main Results:

• Healthy dentin showed significantly lower calcium and microhardness after conditioning.
• Fluorotic dentin exhibited irregular etching patterns under SEM, suggesting bonding challenges.
• Fluorotic dentin demonstrated greater resistance to demineralization compared to healthy dentin.

Conclusions:

• Fluorotic dentin possesses higher resistance to demineralization due to its composition and structure.
• Lower calcium content and microhardness in healthy dentin after conditioning are significant findings.
• Dental clinicians may need to adapt conditioning protocols for optimal adhesive bonding in fluorotic teeth.