Reference Guide
Shank Flexibility related to Instrument use
Shank Type
Uses
Examples
Flexible
• Detection of subgingival calculus • Removal of fine calculus • Provides the best tactile sensation to the operator’s fingers via the shank & handle • Removal of moderate or light calculus • Provides good level of tactile sensation, allowing detection and removal of moderate deposits
• Gracey curettes • Explorers
Moderately flexible
• Universal curettes
Rigid
• Removal of heavy calculus deposits • Limited tactile sensation
• Rigid curettes • Sickle scalers • Periodontal files • Hoes
Extra Rigid
• Removal of very tenacious calculus • Limited tactile sensation
• Extra Rigid Gracey curettes
Instrument balance
To function most effectively, an instrument should be balanced. A balanced instrument has working ends that are centered within 2 mm of the long axis of the handle line.
Balanced
Unbalanced
Instrument Markings When the design name and number are labeled along the length of the handle, each working end is identified by the number closest to it. In the illustration below, the working end on the left is the Gracey #1 blade, the right is the Gracey #2 blade. If the design name and number are labeled around the instrument handle, the first number (on the left) identifies the working end at the top and the second number identifies the working end at the bottom of the handle.
E3
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