Calcium hypochlorite as a dentin deproteinization agent: Microleakage, scanning electron microscopy and elemental...

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Restorative Dentistry

Background:

• Collagen removal from dentin is crucial for effective bonding of dental restorations.
• Calcium hypochlorite (CaOCl) is a potential agent for collagen removal.
• Understanding its effect on dentin surface and restoration integrity is essential.

Purpose of the Study:

• To evaluate the impact of collagen removal using calcium hypochlorite (CaOCl) on acid-etched dentin.
• To assess the microleakage of composite restorations following CaOCl treatment.
• To analyze the elemental composition of dentin after collagen removal.

Main Methods:

• Forty third molars were treated with varying concentrations of CaOCl or sodium hypochlorite (NaOCl) or no pre-treatment.
• Cavities were restored with an acetone-based adhesive and resin composite.
• Restorations underwent thermal cycling, methylene blue immersion, and microleakage evaluation using stereomicroscopy.
• Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) analyzed surface morphology and elemental composition.

Main Results:

• No significant difference in microleakage was observed between the CaOCl groups, the NaOCl group, and the control group.
• Calcium hypochlorite (CaOCl) significantly altered dentin surface morphology.
• Elemental analysis revealed an increased presence of calcium at the dentin interface after CaOCl treatment.

Conclusions:

• Calcium hypochlorite (CaOCl) does not increase microleakage in composite restorations when used with an acetone-based adhesive system.
• CaOCl modifies dentin surface characteristics, impacting its elemental composition.
• Further research may explore optimal concentrations and application times for CaOCl in dental procedures.