robbypowell's version from 2016-10-20 23:54


Question Answer
definition: force required to break the wire = ______ strengthUltimate strength
definition: force required to permanently deform the wire = _______ strengthyield strength
High springback/shape memory is a property of which wire material?NiTi (Nickel-Titanium)
List the three wire materials in order of stiffness... greatest to leastStainless steel > TMA > NiTi
List the three wire materials in order of springback (memory) in order of greatest to leastNiTi > TMA > Stainless steel
Definition: ______ is accomplished by heating wire to 850 degrees F for 10 minutes, releasing stress from cold working (bending wire, twisting grains)Annealing
Doubling the diameter of round wire decreases deflection by a factor of _____16 (to the power of 4)
Small changes in round wire diameter has _______ effects on amount of deflectionBIG (doubling diamater decreases deflection 16x)
OIIRR commonly affects which three tooth types... list in order of prevalenceMax Incisors > Man Incisors > 1st molars
Blood supply to the PDL comes through ______ bracnhes of _____ arteries that penetrate the _____ plateHorizontal branches of Interalveolar arteries; Cribiform plate
_____ resorption occurs in the portion of the alveolar bone immediately adjacent to the area of pdl under pressurefrontal resorption
most common orthodontic tooth movementTipping
Most difficult orthodontic tooth movementintrusion
Invisalign is indicated with crowding/spacing ___ to ____ mm, but contraindicated with crowding/spacing of greater than ___ mm1-5; >5
what is the main competitor of invisalign?clear correct
BV occlusion, PDL tears, osteoclast recruitment, bone resorption may be faster than deposition (tooth instability) are the outcomes of _____ forceHEAVY force
what is the minimum amount of time necessary for clinically observable movement to occur6 hours/day (4-8 hours)
treatment accessory that vibrates at 30 Htz with force of 20 gramsaccelerant
What is the most difficult movement to accomplish with invisalign?Extrusion
For invisalign... you must send off what two things?PVS Implementation & bite registration
Is CR=MI one of the 6 keys of occlusal relationship?No (molar relationship, crown angulation, crown inclination, no rotations, no spaces, flat occlusal plane)
_____ order = in/out bendsfirst order
_____ order = bucco-lingual positioning to accommodate tooth thickness and rotationfirst order
when moving root in a lingual direction ( or crown in buccal direction) this is ______ torque (positive/negative)positive
In third order movement... the wire must be twisted in the direction that the _____ should moveRoot
Molar bands should fall ______ below marginal ridges, the hooks should be oriented toward the _____, and separators are left in place for ____ days0.5mm; distal; 7 days
Common bracket slot heights... maxillary centrals/ canines/ 1st bicuspid, mandibular canines have a height of ____ mm4.5
common bracket slot heights... maxillary laterals/ 2nd bicuspid, mandibular incisors/ 1st premolar have a height of _____ mm4.0
common bracket slot heights... mandibular 2nd premolars have a height of _____ mm3.5 mm
Kravitz found ClinCheck vs models had ___% accuracy (most accurate- lingual constriction, least accurate- extrusion), rotational movements over __degrees were inaccurate41%; 15 degrees
Chisari reported that only ___% of programmed movement of a single incisor was actually achieved over 8 weeks57%
a force whose line of action is directed through the COR will produce what tooth movement?translation (bodily movement)
Why are TAD surfaces polished?to prevent osseointegration
-application of two forces equal in force but opposite in direction, producing rotation movements around center of resistance is the definition of a ______couple
a tooth that is periodontically compromised has its center of rotation positioned more _____apically

is invisalign indicated or contraindicated

Question Answer
crowding/spacing 1-5mmindicated
deep overbiteindicated
non skeletal arch expansionindicated
mild relapse of fixed applianceindicated
crowding/spacing 5+mmcontraindicated
Skeletal AP discrepancies of 2+mmcontraindicated
severely rotated teeth (20+ degrees)contraindicated
need for extrusioncontraindicated
open bitescontraindicated
extraction casescontraindicated

optimum force levels for types of movement

Question Answer
Tipping35-60 (g)
Bodily movement (translation)70-120 (g)
Root Uprighting50-100 (g)
Rotation35-60 (g)
Extrusion35-60 (g)
Intrusion10-20 (g)

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