Ca2+ diffusion through dentin of Ca(OH)2 associated with seven different vehicles

Area of Science:

• Biomaterials Science
• Dental Materials
• Physical Chemistry

Background:

• Calcium hydroxide (Ca(OH)2) is widely used in endodontics.
• Understanding Ca(OH)2 diffusion through dentin is crucial for optimizing treatment efficacy.
• The vehicle used with Ca(OH)2 significantly impacts its interaction with dentinal tubules.

Purpose of the Study:

• To measure calcium ion (Ca2+) diffusion through human dentin using Ca(OH)2 with various vehicles.
• To evaluate how different vehicles influence the interaction of Ca(OH)2 with dentinal structures.

Main Methods:

• 41 human premolar teeth were used after mechanical preparation and smear layer removal.
• Ca2+ concentration was measured over time using atomic absorption spectrophotometry.
• Teeth were divided into control and experimental groups, with experimental groups receiving Ca(OH)2 paste mixed with different vehicles (saline, polyethylene glycol, glycerin, camphorated parachlorophenol, tricresol formaldehyde, anesthetic solution).

Main Results:

• Diffusion of Ca2+ through dentin differed significantly among the tested groups.
• Interactions between the medications and dentinal structure, or among the medications themselves, were observed.
• Medication coating of dentinal tubules was found to facilitate Ca2+ diffusion.

Conclusions:

• The choice of vehicle for Ca(OH)2 paste critically affects Ca2+ diffusion in root canals.
• Medication vehicle interactions influence the transport of Ca2+ into the dentin.
• Coating of dentinal tubules by medicaments plays a key role in Ca2+ ion movement.