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Wrought wire used in dental clasps typically requires an 18 gauge. This specific gauge is favored because it provides a balance of strength and flexibility, which is essential for effective clasp design in partial dentures or orthodontic appliances. The 18 gauge wire is thick enough to ensure durability and resistance to deformation while still allowing for the necessary adjustments to be made during the fitting process. It also allows for secure retention without causing undue discomfort to the patient.

Using a wire gauge that is either thinner or thicker than 18 may not perform optimally; for example, thinner wires might not be strong enough to secure dental restorations effectively, while thicker wires could lead to rigidity, making them less comfortable for the patient. Therefore, the choice of an 18 gauge wire for dental clasps is a well-established standard in dental practice.