Calcium hydroxide dressings using different preparation and application modes: density and dissolution by simulated...

Area of Science:

• Endodontics
• Dental Materials Science

Background:

• Calcium hydroxide (Ca(OH)2) is a crucial intracanal medicament in endodontic therapy.
• Effective delivery of Ca(OH)2 paste is essential for its therapeutic efficacy, yet void formation can compromise treatment outcomes.

Purpose of the Study:

• To evaluate the influence of different simulated root canal preparation shapes on the void content after Ca(OH)2 paste application.
• To compare the efficacy of syringe versus lentulo spiral delivery methods for Ca(OH)2 paste in simulated root canals.

Main Methods:

• Three groups of simulated root canals were prepared with varying apical sizes and tapers (20/.10, 30/.08, 40/.04).
• Calcium hydroxide paste was delivered using either a syringe or a lentulo spiral.
• Radiographic analysis was performed to quantify voids, and fluid leakage was assessed after simulated pressure application.

Main Results:

• Root canals prepared with a size 40 apical diameter and 0.04 taper exhibited significantly fewer radiographic voids.
• The lentulo spiral technique resulted in significantly fewer voids compared to the syringe delivery method.
• A higher incidence of voids was observed in the coronal third of the root canals.

Conclusions:

• Root canal preparation geometry and the method of Ca(OH)2 paste application significantly affect the homogeneity of the filling.
• Optimal results, characterized by minimal voids, were achieved with a 0.04 taper preparation and lentulo spiral delivery.