Computer simulation on creep of amalgam in Class I cavity

Area of Science:

• Biomaterials Science
• Dental Materials
• Computational Mechanics

Background:

• Dental amalgam is a common restorative material.
• Understanding amalgam's long-term behavior, specifically creep, is crucial for clinical success.
• Class I cavities represent a frequent clinical scenario for amalgam restorations.

Purpose of the Study:

• To simulate and analyze the creep behavior of dental amalgam within a Class I cavity.
• To investigate the influence of stress and time dependencies on amalgam creep strain.
• To evaluate the role of tooth crown elastic deformation on restorative material performance.

Main Methods:

• Utilized an axi-symmetric elastic creep finite element method for simulation.
• Incorporated stress and time dependencies of creep strain with postulated exponents (stress: 2.0, time: 1.0).
• Simulated occlusal forces of 40, 100, and 150 N on enamel caps.

Main Results:

• Creep strain of amalgam did not increase linearly with time.
• Amalgam deformation led to stress-free states, with creep rate being stress-dependent.
• Elastic deformation of the unfilled tooth crown significantly affects amalgam creep strain.

Conclusions:

• Tooth crown elasticity is a critical factor in determining amalgam creep strain.
• The gap between the cavity preparation and the restorative material is influenced by creep behavior and crown deformation.
• Non-linear creep behavior necessitates advanced modeling for accurate prediction of amalgam restoration longevity.