Which term denotes water uptake causing swelling in a dental material?

Which term denotes water uptake causing swelling in a dental material?

• A. Absorption
• B. Desorption
• C. Imbibition
• D. Osmosis

Answer: (C)

Imbibition is the process where water is taken into a porous dental material, causing it to swell. When a material has a network of pores or a hydrogel-like structure, water uptake expands the matrix and increases volume. This specific link between water absorption and dimensional growth is what imbibition denotes. Absorption is a broader term for liquid uptake and doesn’t always imply swelling. Desorption is the loss of water leading to shrinkage, not swelling. Osmosis involves water moving across a semipermeable membrane and isn’t the mechanism behind swelling of a solid dental material.

Imbibition is the process where water is taken into a porous dental material, causing it to swell. When a material has a network of pores or a hydrogel-like structure, water uptake expands the matrix and increases volume. This specific link between water absorption and dimensional growth is what imbibition denotes. Absorption is a broader term for liquid uptake and doesn’t always imply swelling. Desorption is the loss of water leading to shrinkage, not swelling. Osmosis involves water moving across a semipermeable membrane and isn’t the mechanism behind swelling of a solid dental material.