What is a defining characteristic of a universal curette?

A universal curette is specifically designed to be adaptable for use on all tooth surfaces, which includes both anterior and posterior teeth. This versatility is a key defining feature that allows practitioners to efficiently scale and root plan in various clinical situations without needing to switch instruments for different teeth.

Unlike specific instruments that may be tailored for particular surfaces or areas of the mouth, a universal curette's blade design and angle enable it to effectively access and remove calculus from both supragingival and subgingival areas. This characteristic makes it an invaluable tool in periodontal therapy, enhancing the practitioner's efficiency and thoroughness during treatment.

The other choices highlight distinctions that are not applicable to universal curettes; their inability to function effectively across a range of dental surfaces would not align with the instrument's defined purpose. For example, a sharp point is not typical for a universal curette's design, as it generally has a rounded toe to prevent tissue trauma. Moreover, a universal curette is not limited to specific teeth or solely to supragingival use, which would contradict its broad utility in periodontal practice.