Which of the following should NOT be used for gingival tissue management prior to cementing a fixed prosthesis?

Correct answer: A. A Tofflemire matrix band

• A. CORRECT — not a tissue management method. The TOFFLEMIRE matrix system is a retainer and band used to contour and confine restorative material in a Class II DIRECT restoration. It is not a gingival displacement device and has no role in preparing tissue for a fixed prosthesis.
• B. Electrosurgery achieves troughing and hemostasis, but it is CONTRAINDICATED in patients with pacemakers or implantable cardiac devices and must be kept away from bone and metallic restorations.
• C. Diode lasers provide troughing with excellent hemostasis and are widely used for tissue management.
• D. Retraction cord (plain or impregnated with aluminum chloride, ferric sulfate, or epinephrine) is the standard mechanical/chemical displacement method.

Note: Avoid epinephrine-impregnated cord in cardiac patients, uncontrolled hypertension, hyperthyroidism, and diabetes with vascular disease.