Principles of Instrumentation Flashcards
(36 cards)
Fulcrum=
Finger rest
Adaptation=
Rotation or rolling
*keeping the SIDE of the last 2mm of the working end on the tooth
Place the terminal shank _____ to the surface to be instrumented
Parallel
______ of tip adapted to conform to contour of surface
Side
*not middle or toe/tip
Tip should be pointed in the direction of the stroke; pointed distally if going ____, mesial if going _____
Distal, mesial
Scaler and curette surfaces:
Face, back, laterals, 2 CE’s
The shank-
Connects the handle with the working end. Allows for adaptation of the working end to the tooth surface; may be angles, curved, or straight.
_______ of the shank reflect the intended use of the instrument
Design features
Diameter of instrument plays a role in ____ _____
Deposit removal
Thick diameter for ______
Heavier deposit
Thinner diameter for _______
Light deposit, root surface debridement
Rigidity is determined by ______
The shank
Grasp=
Stabilization
Long shank are for ______ teeth
Posterior
Shorter shank for _______ teeth
Anterior
Straight shank=
Simple shank
Multiple bends in shank=
Complex shank
Terminal shank=
KEY POINT
Portion of the shank closest to the blade
Terminal shank
Part which contacts tooth that does the work
Working end
*sharp cutting edge
Cross sectional shapes:
Half moon, half circle- curette
Triangular- scaler
Cylindrical- probe
Trapezoid- file, hose, chisel
Tips:
Blunt- probe
Sharp pin point- explorer
Rounded toe- curette
Back:
Angled/point- slightly sub
Rounded- meant to go deep in tissues
Working end ____ be perpendicular to the shank _____ degrees
May, 90