Hand Instrumentation
What is the purpose of the terminal shank on an area-specific curet?
Determines the working end and indicates the surface being instrumented.
What is the primary advantage of powered instrumentation over hand scaling?
Efficient removal of moderate to heavy deposits with less clinician fatigue.
What is the recommended posture during instrumentation?
Maintain the natural curve of the spine with a neutral posture.
What type of grasp is recommended for periodontal instrumentation?
Modified pen grasp.
A patient presents with light supragingival calculus on anterior teeth. Which instrument would be most appropriate?
A sickle scaler
Which instrument is designed specifically for subgingival calculus removal and root debridement?
A curet.
What is required for ultrasonic scalers to effectively remove calculus?
Water.
How much should the operator's trunk flex forward?
No more than about 20°
What is the role of a finger rest (fulcrum)?
Provides stability and control during instrumentation.
A patient has light moderate subgingival calculus on the distal of a posterior tooth. Which instrument is most appropriate?
An area-specific Gracey curet.
What is the ideal lower shank angulation to achieve for effective calculus removal with a curet?
Approximately 70° to 80° between the face and tooth surface.
Why should clinicians keep the ultrasonic tip in constant motion during instrumentation?
To prevent damage to the tooth surface and minimize patient discomfort.
60-100 degrees, 90 is ideal***
Why should excessive force with grasp be avoided?
It increases fatigue and/or provider is unable to use tactile sensitivity
During ultrasonic instrumentation, a patient reports sensitivity from cold water. What adjustment can be made?
Use warm water if available and adjust power/water settings appropriately.
Why is maintaining a secure modified pen grasp important?
It improves instrument control, tactile sensitivity, and reduces clinician fatigue.
Why should the tip of an ultrasonic scaler generally be avoided directly on the tooth surface?
The tip is the most powerful area and may damage tooth structure or cause discomfort.
How should the hand be positioned to be in a Neutral position?
Aligned with forearm
What wrist/hand movement is primarily used during scaling strokes?
Wrist rocking and finger rolling
You are scaling the mandibular anterior lingual surfaces and have poor visibility. What should you do?
Use indirect vision with the mouth mirror and reposition yourself appropriately.
A clinician is using a Gracey 11/12, which side of the tooth should the cutting edge be adapted to?
Mesial surface
What is a key indicator that an ultrasonic insert may need replacement?
Excessive tip wear, which reduces efficiency and effectiveness.
Where should the patient's oral cavity be positioned relative to the clinician's elbow?
At or slightly below elbow height.
What is a consequence of using a poor fulcrum throughout a clinical session?
Reduced control, increased fatigue, and possible tissue trauma.
A clinician is experiencing wrist pain while treating multiple patients. What is the most likely ergonomic issue?
Excessive wrist flexion/extension, poor fulcrum, or excessive pinch force during instrumentation. (will accept any or all)