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Related Experiment Videos

Cuspal flexure associated with amalgam restorations.

D Assif1, B L Marshak, R Pilo

  • 1Tel Aviv University, Maurice and Gabriela Goldschleger School of Dental Medicine, Israel.

The Journal of Prosthetic Dentistry
|March 1, 1990
PubMed
Summary
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Dental amalgam restorations can cause permanent deformation of tooth cusps due to condensation forces. However, teeth fully recover their original shape after amalgam removal, indicating elastic deformation.

Area of Science:

  • Biomaterials Science
  • Dental Materials
  • Biomechanics

Background:

  • Cavity preparation can lead to cuspal flexure under occlusal loads.
  • Dental amalgam undergoes dimensional changes after condensation.
  • Understanding the mechanical effects of amalgam on tooth structure is crucial for restorative dentistry.

Purpose of the Study:

  • To measure changes in premolar cuspal position during and after restoration with dental amalgam.
  • To investigate the deformation of tooth cusps caused by amalgam condensation and setting.
  • To assess the reversibility of cuspal deformation after amalgam removal.

Main Methods:

  • Strain gauges were attached to the buccal surfaces of premolars.
  • Strain measurements and time-strain curves were recorded during and for 24 hours after amalgam condensation.

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  • Amalgam was removed, and subsequent readings were taken to observe elastic recovery.

    • Main Results:

    • Dental amalgam restoration induced a static load on tooth cusps, leading to permanent deformation.
    • Complete elastic recovery of cuspal position was observed in all teeth after amalgam removal.
    • The study quantified the immediate and long-term effects of amalgam on tooth cusp mechanics.

    Conclusions:

    • Amalgam condensation and setting create forces that cause temporary, but significant, cuspal deformation.
    • The tooth's cusps exhibit complete elastic recovery upon removal of the amalgam restoration.
    • These findings highlight the dynamic mechanical interplay between dental amalgam and tooth structure.