Clinic 2 midterm Flashcards
How many functional cutting edges does a racy curet have per end?
One
What type of calculus can be removed with a Gracey curet?
Ridge shank is light to heavy
How are gracey curets different from the universal curets?
They can only be used on certain teeth; area specific more complex shank
What type of ridge does the Gracey have in the SJVC cassettes ?
Ridge
Which cutting edge of a gracey is used for calculus removal?
Lower working cutting edge
Identify the Graceys by # with their area of use
1/2-all surfaces of anteriors
7/8-Buccal lingual
11/12- mesial of the posterior teeth
13/14-distal of the posterior teeth
15/16- Mesial,Buccal, lingual of posterior
Gracey is automatically tilted to 70 degrees when?
Lower shank is parallel to the tooth surface being instrumented
Who designed gracey curet serious of instruments?
Dr. Clayton Gracey
How do you determine the correct working edge of the gracey?
- Hold the instrument so that you are looking at the face of the working end
2.position the lower shank so that it is perpendicular to the floor
3.find the cutting edge that is lower then the other - The lower cutting edge is the one that is used for instrumentation
Best instrumentation sequence
Start with the removal of the Supra gingival first and start with the universal
Which 2 instruments have th identical shank but are off set on angles?
13/14 & 15/16
What is the purpose of a periodontal file
To crush or roughen heavy deposits
Files are never to be used directly on
Enamel or root surface it will gawge the surface
What characteristics of the gracey allow it to be used in the deepest area of the sulcus or pockets with no tissue trauma?
Round back and rounded toe
Describe the design characteristic of the after 5 curets?
3mm longer in the terminal shank
Describe the design characteristics of the mini 5 curets?
Shorter blade, working end is about half of the length of a standard gracey; short blade allows easier insertion into narrow pockets and tight tissues
Calculus removal with an ultrasonic tip starts from
Top down
What is the first thing you do after turning on the ultrasonic?
Flush the waterline and check the power level
How should the tip of an ultrasonic insert be adapted to a tooth?
2-4 mm on the lateral sides to the tooth sureface
Why fill the hand piece with water before inserting the tip
Expels air bubbles from the hand piece; air bubbles can cause the hand piece to over heat
What type of lateral pressure is applied with powered instruments?
None only light touch
How often should the water level be adjusted
Everytime you change tips
What is a warm hand piece a sign for?
Not enough water
What type of grasp is used with a ultrasonic
Modified pen grasp
Standard ultra sonic working end
Larger in size with shorter shank length; removes moderate- heavy calculus
Slim line ultra sonic working end
40% smaller in size with longer more complex shank removes light- moderate calculus
How are the amounts of energy dispersed on the ultra sonic tip starting from highest power to lowest power?
Point of the tip, concave face, convex back, lateral surfaces
What is the sequence the serious of ultra sonic tips should be used?
Standard first then slim line
The tip-tooth surface angulation should be?
The triple bend standard insert can be used to better adapt to ?
Which portion of the working end is most frequently used?
Lateral surface is the most effective
What part of an insert is responsible for calculus removal?
Frequency
Amplitude
What factors influence the powe setting
Stubbornness of the calculus
Cavitation
Transverse orientation
Cross wise; lateral surface of th working end is adapted to the proximal surface starting from the outermost edge ( best for interproximal)
Vertical orientation
Working end is positioned with the lateral surface against the tooth surface, tip down and moving vertically up and down (prob like) (best for pockets and deplaqueing)
Why is it important to keep the tip of a powered instrument moving
Tapping
Tip placed onto the calculus and start tapping down on the calculus
Sweeping
Ergonomics
Study of the workers and their occupational environment
Ergonomic risks factors for a DH
-prolonged static postures
-repetitive movements
-Working in a confined space
-challenges with positioning yourself or the patient
-limitations with tools and equipment used
Consequences of poor ergonomics
-fatigue
-Pain/discomfort
-illness/injury
-Missed days at work
-Errors
-Lower productivity
-Patient dissatisfaction
2 most common causes for musculoskeletal disorders in the DH profession
-Cumulative trauma
-prolonged static posture
Things that cause cumulative trauma
-Repetitive movements like scaling and polishing
- vibrations from the hand piece
Static posture leads to ?
Muscular imbalances; problems with neck rotation to right or left side
Carpal tunnel
Compression of the median nerve as it passes through the carpal tunnel; Caused by pinching and gripping activities with wrist bent; made worse with repetitive flex ion and extension activities at wrist
Trigger finger
Forceful grip and repetitive motion irritates the tendon & sheaths, nodules form in the tendon causing warm, swelling, tenderness; pain occurs during movement that places tendons in tension; finger locks in a trigger position
Cubical carpal tunnel syndrome
Prolonged use of the elbow while flexed or trauma from overuse can compress the ulnar nerve; pain, numbness, tingling, and impaired sensation in the little and ring fingers, side and back of the hand; loss of fine control, reduce finger grip strength
What is the leading cause of occupational disability in the dental healthcare profession?
Lower back pain
What is the best position for a dental hygienist to sit in?
Leg balanced sitting; allows for forward and upward posture to transfer the body support to the feet
Angulation for correct seating
Hips- 100-120
Knee angle- 110-135
Forward seat title of 45-55 from horizontal
Opposing muscle groups balaced and curve in the lower back stays maintained
What can a hygienist utilize to improve neck posture?
Magnification system like Loupes
What type of seating can aid in better posture and back relief?
What are some ways to prevent ergonomic injuries
-frequent breaks
-shorter breakers are preferable
-changes in positioning before feeling pain
-go back to neutral posture
When are instruments sharpened ?
What is done with the stone father it has been lubricated and used to sharpen instruments on the tray?
What sharpening technique does SJVC utilize?
What is the correct angulation of the stone for sharpening?
What are the consequences of a dull instrument?
Why dont we sharpen the face of the instrument?
How do you reduce the occurrence of a wire edge?
How do you reduce the occurrence of a wire edge?
What is the Most important step in sharpening a gracey
