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An increase in size, length, area, or volume. Delayed expansion occurs when amalgam has been contaminated with water during trituration or packing into a prepared cavity. An expansion plate is an orthodontic appliance used to increase the width of the dental arch by buccal or labial movement of the teeth. Thermal expansion of an investment mould compensates for the thermal contraction of cast metal when it solidifies.

Subjects: Dentistry.

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