What angle is the face of a universal curette positioned in relation to the terminal shank?

The face of a universal curette is designed to be positioned at a specific angle of 90 degrees in relation to the terminal shank. This angle is crucial because it allows the curette to effectively adapt to various tooth surfaces, including both anterior and posterior teeth. The 90-degree angle ensures that the cutting edge of the curette is optimally aligned to engage with the tooth surface, maximizing efficacy in removing calculus and debriding tissue.

The geometry of the curette with this angle aids clinicians in reaching interproximal areas and in accessing deeper periodontal pockets. A properly positioned face enhances the instrument's ability to deliver precise and effective scaling, which is a fundamental aspect of periodontal therapy and health maintenance. This design characteristic is part of what differentiates universal curettes from other instruments in the periodontal toolkit, allowing for flexibility and effectiveness in diverse clinical scenarios.