Cuspal flexure associated with amalgam restorations

David Assif*, Barry L. Marshak, Raphael Pilo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Cavity preparation causes cuspal flexure under simulated occlusal loads. During amalgam condensation, the dentist exerts forces on the tooth. After condensation, dental amalgam undergoes dimensional changes. We measured possible changes in the cuspal position of premolars during and after their restoration with dental amalgam. Strain gauges were attached to the buccal surfaces of the teeth, and a direct reading of the strain and a simultaneous time-strain curve were obtained. Measurements were taken at the onset of amalgam condensation and continued for 24 hours. The amalgam was then removed from the teeth, and a subsequent reading was made. On the basis of this model, we found that the use of amalgam as a restorative material caused a static load on the cusps of the teeth brought about their consequent permanent deformation. After amalgam removal, we observed complete elastic recovery for all the treated teeth.

Original languageEnglish
Pages (from-to)258-262
Number of pages5
JournalJournal of Prosthetic Dentistry
Issue number3
StatePublished - Mar 1990


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