Evaluation of shear strength at the cement-endodontic post interface

Area of Science:

• Biomaterials Science
• Dental Implantology
• Materials Engineering

Background:

• The cement-implant interface is crucial for the long-term success of endodontic implants.
• Different implant surface designs (smooth-tapered, threaded, porous) may influence mechanical strength.
• The choice of dental cement can significantly affect the bond strength and stability of the implant.

Purpose of the Study:

• To evaluate the tensile and torsional shear strength of the cement-implant interface for various endodontic implant designs.
• To compare the mechanical performance of zinc phosphate, polycarboxylate, glass-ionomer, silicophosphate, and AH-26 cements in endodontic applications.
• To determine the optimal implant surface and cement combination for enhanced mechanical stability.

Main Methods:

• Mechanical testing of cement-implant interfaces under tensile and torsional loads.
• Evaluation of smooth-tapered, threaded, and porous-surfaced endodontic implants.
• Assessment using five different dental cements: zinc phosphate, polycarboxylate, glass-ionomer, silicophosphate, and AH-26.

Main Results:

• Threaded endodontic implants demonstrated superior shear strength under axial loading.
• The shear strength of threaded implants decreased significantly when subjected to torsional forces.
• Porous-surfaced endodontic implants exhibited robust resistance to both axial and torsional loading, indicating high stability.

Conclusions:

• Porous-surfaced endodontic implants offer the most reliable mechanical performance, withstanding both axial and torsional forces effectively.
• Threaded implant designs are advantageous for axial loading but show vulnerability to torsional stress.
• Material selection and implant surface characteristics are critical factors in optimizing the mechanical integrity of cement-endodontic implant interfaces.