TESTING OF ZIRCONIA FPD FRAMEWORKS FOR FIXED PROSTHESES: MODEL DESIGN AND EVALUATION OF FRACTURE LOAD

Area of Science:

• Biomaterials Science
• Dental Materials
• Mechanical Engineering

Background:

• Previous resin-based dental models fractured during mechanical load testing of abutment teeth.
• A need exists for a more durable model to accurately test ceramic-based framework materials for fixed dental prostheses (FPDs).

Purpose of the Study:

• To develop and evaluate a novel dental model for mechanical testing of three-unit FPDs.
• To assess the fracture resistance and stability of a new model utilizing zirconia FPD frameworks under mechanical loading.

Main Methods:

• A new test model was developed using zirconia frameworks for three-unit FPDs.
• The model underwent mechanical loading until fracture to evaluate its performance.
• Key metrics included fracture load, abutment tooth integrity, and framework-to-base adhesion.

Main Results:

• The developed model, featuring zirconia frameworks, withstood a fracture load of up to 1,636 N without failure.
• Neither the artificial abutment teeth nor the base model fractured during the mechanical tests.
• Artificial abutment teeth remained securely attached to the base model throughout the testing.

Conclusions:

• The novel zirconia framework-based dental model demonstrates superior durability and stability compared to previous resin-based models.
• This robust model is suitable for mechanical testing of most ceramic-based framework materials used in three-unit FPDs.
• The findings support the use of this model for reliable evaluation of dental prostheses under simulated functional stresses.