A limited path of placement can be provided by which of the following?

A limited path of placement refers to a situation in prosthetic dentistry where the positioning of a prosthetic device, such as a crown or bridge, is restricted to a specific direction or angle. This is crucial for ensuring that the prosthesis fits properly and aligns with the surrounding tooth structure.

When opposing walls of a preparation are slightly convergent, it means they come closer together as they extend apically. This convergence helps establish a more defined path for the placement of the dental restoration. It can limit how the restoration moves during insertion, making it easier to control the position in relation to the available space and the adjacent teeth. This is especially beneficial in achieving a proper fit and preventing issues like binding or misalignment.

In contrast, options related to proper marginal fit, increased surface area, or reduced tooth height do not fundamentally affect the path of placement in the same way. While a good marginal fit is essential for the overall quality of a restoration, it does not inherently provide a limited path of placement. Increased surface area could enhance retention but does not necessarily control the placement direction. Reduced tooth height might impact the aesthetics or function of the restoration but would not create a necessary constraint on the direction of placement.