A multiparametric evaluation of post-restored teeth with simulated bone loss

Area of Science:

• Dental Materials
• Biomaterials
• Restorative Dentistry

Background:

• Endodontically treated teeth have increased fracture risk due to structural loss and altered biomechanics.
• The stability of post-restored teeth with periodontal destruction requires further investigation.

Purpose of the Study:

• To evaluate the influence of post material on endodontically treated teeth with simulated bone reduction.
• To assess multiparametric outcomes including tooth deformation, marginal integrity, and fracture resistance.

Main Methods:

• Sixty extracted premolars were endodontically treated and restored with glass-fiber, titanium, or cast posts.
• Simulated bone reduction (2 or 6 mm) was applied, followed by crown restoration.
• Digital image correlation, thermocycling, and fracture testing were used for evaluation.

Main Results:

• Tooth deformation correlated with support conditions, particularly for fiber posts.
• Cast posts demonstrated superior marginal integrity post-thermomechanical loading compared to fiber and titanium posts.
• Reduced bone support significantly decreased fracture strength and increased non-repairable root fractures.

Conclusions:

• Post material is a primary determinant of root fracture resistance, influenced by support conditions.
• Cast posts provide better marginal integrity and resistance to fracture in compromised periodontal situations.
• Reduced bone support negatively impacts the biomechanical stability and fracture outcomes of post-restored teeth.