Which impression material is known for its viscosity and is used for capturing fine details?

Light body impression material is recognized for its high viscosity, making it especially effective at capturing fine details in dental impressions. This material is typically used in conjunction with heavier substances during the impression process. Its lower viscosity allows it to flow easily around prepared teeth, capturing intricate features such as margins and surface textures, which are critical for producing accurate models.

In contrast, heavy body impression material has a higher viscosity and is used primarily to provide bulk and support the impression tray, but it does not capture fine details as effectively as light body material. Tray material is designed for use in creating a supportive structure for the impression and does not have the same detail-capturing properties. Alginate, although popular for initial impressions due to its ease of use and quick setting time, does not capture fine details to the extent that light body material can, especially in more precise situations such as crown and bridge impressions. This distinction makes light body impression material the most suitable choice for applications requiring detailed accuracy.