Retention of amalgam depends on:
- a- amalgam bond.
- b- convergency of walls oclusally***
- c- divergency of walls oclusally.
- d- retentive pins.
The answer is b. convergency of walls oclusally.
The convergency of walls oclusally is one of the most important factors affecting the retention of amalgam restorations. When the walls of the preparation converge occlusally, this creates a wedge-shaped space that helps to lock the amalgam in place. In contrast, if the walls of the preparation diverge occlusally, this creates a gap that can allow the amalgam to loosen.
factors that can affect the retention of amalgam restorations:
Other factors that can affect the retention of amalgam restorations include:
- The amount of remaining tooth structure:
More remaining tooth structure will provide more retention for the amalgam.
- The type of retention features used:
Auxiliary retention features, such as pins and slots, can help to increase the retention of amalgam restorations.
- The technique used to place the amalgam:
The amalgam should be placed carefully and condensed tightly to ensure good retention.
Therefore, the convergency of walls oclusally is one of the most important factors affecting the retention of amalgam restorations.
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