Effect of restorative materials on cuspal flexure

Area of Science:

• Biomaterials Science
• Dental Materials
• Biomechanics

Background:

• Assessing the mechanical properties of restored teeth is crucial for understanding their long-term performance.
• Previous methods often lack the ability to evaluate the same tooth under varying conditions non-destructively.

Purpose of the Study:

• To establish a methodology for determining surface strains in specific tooth locations under intact, prepared, and restored states.
• To compare the influence of different dental restorative materials on tooth stiffness when subjected to cuspal loading.

Main Methods:

• Thirty extracted maxillary premolar teeth were used, with two linear strain gauges mounted on each.
• Teeth were embedded in resin and divided into three groups based on restorative material and application.
• Surface strains were measured under intact, prepared, and restored conditions with cuspal loading.

Main Results:

• A statistically significant interaction was found between restorative material and tooth condition at both proximal and buccal sites.
• Significant differences in stiffness were observed at the proximal site between teeth restored with Tenure/Marathon V and those restored with amalgam or Scotchbond 2/P-50.
• The developed methodology proved to be a useful, non-destructive means for testing individual teeth.

Conclusions:

• The established methodology allows for reliable, non-destructive evaluation of tooth stiffness under various conditions.
• The choice of restorative material significantly influences the mechanical stiffness of premolar teeth.
• Further research can utilize this method to compare a wider range of restorative materials and loading scenarios.