G. Mod. 8 Instrument Design & Classification Flashcards
Why is handle design important
Characteristics to consider
To prevent musculoskeletal injury during instrumentation
Lightweight, large diameter, tapered handle, raised texturing (knurling pattern)
More pinch force =
Disorder that can develop?
Muscle cramping, carpal tunnel
Avoid handles that are
Heavy, solid metal
Small diameter
No texture or non raised
Nontapered
When is a periodontal instrument balanced
The working ends are aligned with the long axis of handle
(Working end Centered with midline of handle)
Why is balance important
If not balanced it is ____ __ ___and will ____ ____
Ensures that finger pressure applied against handle is transferred to working end for calculus removal
Not balanced can stress muscles, difficult to use
Simple shank is
Straight
Used for anterior
Complex shank has
Side to side bends
-angled curved shanks used for posteriors
(Explorer, universal)
What do they remove
Rigid shank
Flexible shank
Removes heavy deposits
Removes small to medium deposits (explorer, probe)
Flexible shank characteristics
Enhances amount of tactile information to fingers
Vibrations to working end when over irregular tooth surface
(Explorer)
Functional shank, portion that allows…
Lower shank, portion nearest…
Aka
Portion of shank that allows working end to be adapted to tooth (curves)
Portion of functional shank that is nearest to working end
Aka terminal shank
Functional shank begins below working end and extends to the ____ bend in the shank nearest handle
Last
Simple shank with short functional shank used for
Simple shank with long functional shank used for
Supragingival on anteriors
Subgingival on anteriors
Complex shank with short functional shank
Complex with long functional shank
Supragingival use on posteriors
Subgingival on posteriors
1/2, 5/6 are the same instrument design. 5/6 just has an _____ lower shank
Extended
Unpaired working ends have _____ working ends
Paired working ends have _____ image working ends
Dissimilar
Mirror
