only used for removing pulpal tissue when patient presents with symptoms of irreversible pulpitis.
okay in anterior teeth but not good not narrow, curved canals.
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why are hand instruments used in the early stages of instrumentation
to establish a glide path prior to rotary instrumentation
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when are flexofiles used, what are the advantages?
used for most hand instruments- preparation glide path, apical gauging, negotiating ledges and blockages.
good flexibility, efficient at cutting dentine with a low risk of transportation and ledge formation
non aggressive tip
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when are hedstroem files used?
only used in retreatment cases to help remove gutta percha or an overfilling of the root canal
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what are the problems with stainless steal root canal preparation
time consuming, less predictable shapes in root canals , debris extrusion with a filling motion, mishaps - ledges, blockages , transportation, zipping foramen
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when are Ni Ti never used in
in a slow speed hand piece
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main advantage of Ni Ti
superplasticity, shape memory
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what are the advantages of M wire
greater flexibility, increased safety (protection against instrument fracture )
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most modern files?
controlled memory files
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ProTaper gold instruments
files that undergo multiple heating and cooling cycles. greater flexibility+ improved resistance to cyclical metal fatigue
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which ProTaper gold instrument does coronal flaring of the root canal
SX
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Advantages of NiTi over **
Increased flexibility in larger sizes tapers. increased cutting efficiency. better safety in use. better user friendliness with less instruments and and simple sequences
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what are the advantages of larger files
optimum obturation and more effective disinfection of the RCS
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What are the disadvantages of NiTi preparation
instrument fracture. expense. access can be difficult in posterior teeth. unsuitable for complex canal anatomy
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Other cards in this set
Card 2
Front
what does the number on each file represent
Back
the diameter of the tip of each instrument in mm. a size 10 would be 10/100= 0.1mm at the tip
Card 3
Front
how long is the working blade
Back
Card 4
Front
what are the3 lengths of the instruments
Back
Card 5
Front
the working length remains 16 so what changes to get 21,25 or 31mm
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