Term
| what is the primary purpose of a fulcrum? |
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Definition
Stability and control
Power through principles of leverage |
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Term
| What is normally seen in traditional fulcrums? |
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Definition
- On tooth fulcrums usually on the occlusal surface
- Same arch usually near the tooth that is being treated
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Term
| What are 3 purposes of alternative fulcrums? |
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Definition
- Improve adaptation
- Improve angulation
- Improve lateral pressure and/or control especially with reinforced fulcrums
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Term
| Name 6 types of alternative fulcrums |
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Definition
- Cross arch/Opposite arch
- Reinforced fulcrum (finger or thumb)
- Finger on finger fulcrum
- Opposite arch fulcrum
- Cross arch fulcrum
- Extraoral fulcrum
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Term
| Give an example of cross arch fulcrum |
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Definition
Rest the ring finger on a tooth on the opposite side of the arch from the teeth being instrumented....
rest left side of mandible to instrument mandibular right molar |
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Term
| Give an example of opposite arch fulcrum |
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Definition
An advanced fulcrum used to improve access to deep pocketrs and to facilitate parallelism to proximal root surfaces. accomplished by resting the ring finger on the arch opposite the treatment area.....
Resting on the mandibular arch to instrument max teeth |
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Term
| Give an example of finger on finger fulcruming |
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Definition
Rest one finger of the dominant hand on the finger of the nondominant hand allowing the clinician to fulcrum in line with the long axis of the tooth to improve parallelism of the lower shank tot he tooth surface....
Left index finger on the OB of the #3.right ring finger on the left index finger to scale Mesal on #4 |
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Term
| Describe and give an example of Knuckle rest the Knuckle rest technique |
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Definition
Resting the knuckles on the clinician's dominant hand against the patients chin or cheek....
Resting the clinician's knuckles on the outside of the pt's cheek for scale the max bucal surfaces |
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Term
Describe Reinforced Fulcrum
Finger or thumb |
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Definition
- Used to concentrate lateral presure against the tooth surfaces
- Help control the working-end throughout the instrumentation stroke
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