robbypowell's version from 2018-09-11 17:03

Crown & Root Positioning (Stage 4)

Question Answer
Goal of stage 4 to position upper and lower incisors to proper ____ and ____, in relation to each otherOverbit & Overjet
Goal of stage 4 All teeth in the arch in good relationships to relative each other and relative to ...opposing arch
Goal- Center crown and roots over____ bonebasal
vertical position and tipping of posterior teeth is assessed by the relative positions of their _____ _____marginal ridges
define: vector that measures the tendency of a force to rotate an object about some axisTorque (physics definition)
define: a controlled change in the labio-lingual crown root angulationtorque (ortho definition)
there is an average torque loss betwee ___-___ degrees for every size of archwire reduction regardless of slot width2-4 degrees
t/f: despite the fact that straightwire bracket systems are machined to specifications... there can still be variations in each bracket...True (not a perfect process... still some error)
lit review: avg edge bevel contribution to deviation angles varied from ___-___ for various wire-bracket groups 0.2-12.9 degrees
____ (high/low) torque prescription allows us to use smaller rectangular AW's for bracket expression and torque expressionHigh
_____-_____: radiograph taken to look at bracket placement and root angulationPan-Repo (panoramic repositioning)
generally speaking... a force that has an intrusive effect on the anteriors will have an ______ effect on posteriors, and vice-versaextrusive (newton's 3rd law)

detailing & finishing (stage 5)

retention (stage 6)

Question Answer
how long should retention be considered in order to attain stability?through finishing of growth
reorganization of pdl fibers takes ___-___ months3-4 months
elastic fibers are active up to _______ months after debonding12 months (1 year)
normal pressures of lips, tongues, cheeks is disrupted by ortho (b/c of avoiding irritation of braces) ... these pressures usually return after _________-_________ months3-4 months
the greatest benefit of a hawley style retainer is what? allow for settling of the dentition within the scope of the retainer
which dimension of growth is last to stop?vertical
what is the order that these dimensions of growth occur/cease (AP, transverse, vertical)transverse, AP, Vertical
growth relapse of class 2 corrections ---> ____ (forward/backward) in upper arch, _____ (forward/backward) in lower archforward in upper; backward in lower
one of the ways to improve chance of optimal outcome is to ______ class2 and class3 before debondOvercorrect
generally... younger patients need _____ (longer/shorter) periods of retentionlonger
deep bite retention is best treated by? ...Max Hawley w Anterior Bite Plate (deep bites tend to recur in adulthood) (this allows continued eruption of posterior as well as settling of the dentition)
Class 3 retention... boys vs girlsMore problematic in males, but still have relapse tendencies due to continued growth potential))
Open bite retention... wwhat should you think?if this is caused by habits are the habits under control
Little's Study showed that following ortho tx, ____% of patients had mild crowding 10 years after tx.50%
Little's Study showed that following ortho tx, ____% of patients had minimal crowding 10 years after tx.20%
Little's Study showed that following ortho tx, ____% of patients had no crowding 10 years after tx.30%
Does 3rd Molar Eruption affect crowding?No... (patients do believe that it does, though...)(research has shown that 3rd molar presence does not impact mandibular crowding whatsoever)
with aging you see (forward/backward) rotation of the mandible, (flattening/steepening) of the mandibular plane, (increased/decreased) anterior overbiteforward, flattening, increased
what is the period for minimum full-time retention?6 months
what area is most likely to relapse?lower incisors