Angulation For Insertion Flashcards
What is angulation?
The relation between the face of the working-end and the tooth surface.
What is insertion?
The action of moving the working-end beneath the gingival margin into the sulcus or periodontal pocket.
What is the face-to-tooth surface angulation for insertion?
An angle between 0 and 40 degrees
How does insertion take place?
Face the tooth as closely as possible and gently move the curet beneath the gingival margin and down the root surface.
What is the get ready zone?
A surface on the middle-third of the crown where the instrument is initially placed to get into position in preparation for instrumentation
How is the working end selected?
Before using a double-ended instrument, decide which working end to use on the treatment area.
The lower shank’s relation to the distal surface of the tooth decides which working end to use.
How should the lower shank be angled relative to the distal surface of the tooth?
It should be parallel and the functional shank should go up and over the tooth.
How should the instrument be inserted?
Place working-end in the get ready zone
Lower instrument and handle until the face is hugging the tooth surface at a 0 degree angle to the tooth.
Gently slide the working-end beneath the gingival margin
What is angulation a relation between?
Between the face of the working end and the tooth surface
What angles are ideal for calculus removal?
> 45 degrees and <90 degrees are necessary for calculus removal and the most ideal angles are 60 - 80 degrees
What happens to the calculus at the correct angulation of the instrument?
The cutting edge will “bite” into the calculus deposit and snap it from the tooth
What are the steps for instrumentation?
1) Prepare patient, equipment, and grasp
2) Establish finger rest
3) Get ready zone
4) Lower instrument handle the face of the working end hugging the tooth
5) Insert by sliding face along tooth surface beneath the gingival margin maintaining 0 degree angulation and keep sliding until you reach base of the pocket.
6) Position working end beneath a calculus deposit
7) Prepare to make a stroke by tilting lower shank toward the tooth surface and locking toe-third of working-end on the tooth
How do we do a good calculus removal stroke?
Each stroke should be made in a step-by-step manner
One stroke is made at a time
Each calculus removal stroke should be distinct and precise
The clinician should pause and relax the hand after each stroke
Steps for angulation and insertion:
1) Place working end in get ready zone on middle third of facial surface
2) Prepare for insertion and lower hand and handle until curette is pointing towards the gingival margin then position working end until it is hugging the facial surface at a 0 degree angle.
3) Insert the working end beneath the gingival sulcus
4) Prepare for stroke, gently slide the working end on the root surface
5) Tilt lower shank toward tooth surface and establish a 60 - 80 degree face to tooth surface angulation by turning away from the facial surface. The lower shank is 90 degrees from the working end so ensure that the lower shank is slightly angled towards the facial surface.
6) Lock on the toe-third with thumb against the tooth surface
7) Make a calculus removal stroke (tiny biting stroke to snap deposit off the tooth)
8) End the stroke with precision by pressing down with fulcrum finger against the tooth
9) Pause and relax finger to lessen strain on muscles of hand
10) Reposition the working end underneath the calculus deposit
