Biomechanics Flashcards
what are complex FPDs (5)
3+ missing
missing canine
combined A+P
non-parallel
1 or 3 abutments
deflection is ___ related to length
directly (x^3)
the longer the FPD, the more ___
deflection
the thinner the FPD, the more ___
deflection
deflection is ___ related to connector height (thickness)
inversely (1/x^3)
minimum metal connector height
3-4 mm x 3-4 mm
minimum ceramic/zirconia connector height
4 mm x 4 mm
max stress that can be applied before plastic deformation occurs
yield strength
how to improve connector yield strength
adhesive cement
how to combat MD torque
BL retention grooves
how to combat FL torque
MD retention grooves
retention grooves increase ___
resistance
adhesive cement increases ___
retention
how to combat forces caused by being outside inter-abutment axis
FL grooves
the ___ is outside the inter-abutment axis
canine
stress is greater in the ___ arch
Mx (WT)
vs Mn (SC)
how to reduce pier abutment failure
non-rigid connector
place non-rigid connector on the ___ so it will seat during mesial movements
distal
non-rigid connector indications
pier abutment
long span FPD
non-parallel
non-rigid connector contraindications
mobile teeth
unopposed teeth
over-reducing tipped molar decreases ___
resistance
cantilever scheme
at least 2 abutments
the ___ can be used as a single cantilever abutment
canine
