What does the term "line angle" refer to in a cavity preparation?

The term "line angle" in cavity preparation specifically refers to the junction of two internal walls. Line angles are critical in the design of a cavity preparation, as they help define the shape and contours of the cavity. Understanding line angles is essential for an expanded function dental assistant because they contribute to proper restoration placement and the overall functional and aesthetic outcome of the dental procedure.

The precise definition involves recognizing that each line angle is formed where two planes (walls) meet within the cavity; this can influence how a restoration sits and how well it seals against the tooth, ultimately affecting its longevity and effectiveness.