الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
In this staidy, the strength of the bond of the repaired amalgam with the use of 225 specimens of 3 different types of amalgam was investigated. The repair was done using the same type of amalgam and different types. The interface area between old and new amalgam was examined by scanning electron microscope. Several COflC1US1OflS appeared to be indicated:
1. The bond strength of repaired amalgam was less than one half the strength of unrepaired amalgam.
2. The bond strength of amalgam repaired at 15 minutes was approximately 50 percent stronger than that of amalgam repaired at 7 days.
3. A possible brpotb.esis for the low strength of a repaired amalgam was lack o± potential for crystal growth on the part of the old amalgam. This lack of potential was due to the fact that the amalgam is partially or completely set