Angulation loading effects on cast-gold endodontic posts: a photoelastic stress analysis

Area of Science:

• Biomaterials Science
• Dental Mechanics
• Biomechanics

Background:

• Dental posts are used to retain restorations in endodontically treated teeth.
• Post diameter is a critical factor influencing stress distribution within the tooth structure.
• Understanding stress patterns is crucial for preventing tooth fracture.

Purpose of the Study:

• To investigate the effect of post diameter on stress distribution under angulated loads.
• To determine optimal post dimensions for minimizing stress in teeth subjected to masticatory forces.

Main Methods:

• Two-dimensional photoelastic stress analysis was employed.
• Ten models, five per diameter, were tested under 30 and 60-pound compressive forces.
• Fringe patterns were analyzed to quantify stress levels.

Main Results:

• Post diameter significantly influences stress distribution under angulated loads.
• Higher compressive forces resulted in increased stress concentrations.
• Smaller post diameters showed reduced internal stresses within the models.

Conclusions:

• Post diameter should be restricted, especially under heavy anterior masticatory forces.
• Restricting post diameter conserves tooth structure and reduces internal stresses.
• This finding is particularly relevant for teeth with cast-gold posts.