Which angle is associated with a short bevel margin when preparing for a shoulder-bevel margin?

The angle associated with a short bevel margin when preparing for a shoulder-bevel margin is typically 135 degrees. This specific angle is crucial in prosthetic dentistry as it facilitates optimal adaptation and seating of the restoration on the tooth preparation. A 135-degree bevel allows for a smoother transition between the axial wall and the margin, enabling better stress distribution during function and enhancing the aesthetics of the final restoration.

In contrast, a much smaller angle would not accommodate proper angulation for effective material placement and could lead to weak margins. Similarly, angles approaching straight would not provide the necessary retention and resistance form required for a stable restoration. Hence, the choice of 135 degrees is backed by its favorable characteristics for achieving a successful shoulder-bevel margin in dental restorations.