Shank/Flexibility

The shank may be long vs short, heavy vs thin, curved vs straight, and universal vs area-specific. Flexibility also matters. Table 3 summarizes flexibility as it relates to use and instrument type. (Categories originally illustrated in HuFriedyGroup educational materials; they apply across brands.)

Table 3. Shank Flexibility

Flexible: Detection of subgingival calculus; removal of fine calculus; best tactile sensation. Examples: Gracey-type curettes; explorers.

Moderately flexible: Light to moderate calculus; good tactile sense. Examples: Universal curettes.

Rigid: Heavy calculus; limited tactile sensation. Examples: Rigid curettes; sickles; periodontal files; hoes.

Extra-rigid: Very tenacious calculus; limited tactile sensation. Examples: Extra Rigid Gracey-type designs.