Orthotown June 2018 - 30
by "fenrisúlfr"
One of Orthotown's most-followed
members online, "fenrisúlfr" trained at
the University of North Carolina at Chapel
Hill and at the University of Texas at San
Antonio. The Townie practices orthodontics
full time in San Antonio, teaches part time,
and is a regular poster on Orthotown.com's
clinical message boards.
Frictionless
Mechanics
in Orthodontic
Space Closure
Introduction
Orthodontic treatment frequently requires the extraction of teeth to
alleviate crowding, optimize facial balance and establish desired functional
goals. The choice of teeth to extract usually depends on the characteristics of
the presenting malocclusion. Severe crowding/protrusion typically warrants
the extraction of first bicuspids, whereas milder manifestations allow for the
extraction of second bicuspids. A retrospective study by Haque et al., however,
failed to find a difference in anchorage loss between the extraction of maxillary
first and second bicuspids.1
Space closing mechanics can be broadly classified into:
* Frictional or sliding mechanics, where the teeth slide along
the arch wire.
* Frictionless or closing loop mechanics, where the teeth and
the arch wire move as a unit.
In general, sliding mechanics offers excellent control of the occlusal plane
and root position, with moment-to-force ratios approaching those required
for translation predictably generated with full-sized arch wires.2 The .022 slot
appliance is uniquely suited to facilitate sliding mechanics owing to the increased
clearance between the slot and the working arch wire (19x25 stainless steel).
However, in situations requiring moderate to maximum anchorage control
as well as intrusion during retraction, closing loops with differential moment
activations may offer a better alternative.3,4 The incorporation of a loop creates
discontinuity between the anterior and posterior segments, allowing them to
behave more independently when compared to a stiff continuous arch wire.
30
JUNE 2018 // orthotown.com
http://www.orthotown.com
Table of Contents for the Digital Edition of Orthotown June 2018
Orthotown June 2018 - Cover1
Orthotown June 2018 - Cover2
Orthotown June 2018 - 1
Orthotown June 2018 - 2
Orthotown June 2018 - 3
Orthotown June 2018 - 4
Orthotown June 2018 - 5
Orthotown June 2018 - 6
Orthotown June 2018 - 7
Orthotown June 2018 - 8
Orthotown June 2018 - 9
Orthotown June 2018 - 10
Orthotown June 2018 - 11
Orthotown June 2018 - 12
Orthotown June 2018 - 13
Orthotown June 2018 - 14
Orthotown June 2018 - 15
Orthotown June 2018 - 16
Orthotown June 2018 - 17
Orthotown June 2018 - 18
Orthotown June 2018 - 19
Orthotown June 2018 - 20
Orthotown June 2018 - 21
Orthotown June 2018 - 22
Orthotown June 2018 - 23
Orthotown June 2018 - 24
Orthotown June 2018 - 25
Orthotown June 2018 - 26
Orthotown June 2018 - 27
Orthotown June 2018 - 28
Orthotown June 2018 - 29
Orthotown June 2018 - 30
Orthotown June 2018 - 31
Orthotown June 2018 - 32
Orthotown June 2018 - 33
Orthotown June 2018 - 34
Orthotown June 2018 - 35
Orthotown June 2018 - 36
Orthotown June 2018 - 37
Orthotown June 2018 - 38
Orthotown June 2018 - 39
Orthotown June 2018 - 40
Orthotown June 2018 - Cover3
Orthotown June 2018 - Cover4
https://www.nxtbook.com/farran/orthotown/orthotown-april-2024
https://www.nxtbook.com/farran/orthotown/orthotown-march-24
https://www.nxtbook.com/farran/orthotown/orthotown-january-february-2024
https://www.nxtbook.com/farran/orthotown/orthotown-december-2023
https://www.nxtbook.com/farran/orthotown/orthotown-november-2023
https://www.nxtbook.com/farran/orthotown/orthotown-october-2023
https://www.nxtbook.com/farran/orthotown/orthotown-september-2023
https://www.nxtbook.com/farran/orthotown/orthotown-july-august-2023
https://www.nxtbook.com/farran/orthotown/orthotown-june-2023
https://www.nxtbook.com/farran/orthotown/orthotown-may-2023
https://www.nxtbook.com/farran/orthotown/orthotown-april-2023
https://www.nxtbook.com/farran/orthotown/orthotown-march-2023
https://www.nxtbook.com/farran/orthotown/orthotown-january-february-2023
https://www.nxtbook.com/farran/orthotown/orthotown-december-2022
https://www.nxtbook.com/farran/orthotown/orthotown-november-2022
https://www.nxtbook.com/farran/orthotown/orthotown-october-2022
https://www.nxtbook.com/farran/orthotown/orthotown-september-2022
https://www.nxtbook.com/farran/orthotown/orthotown-july-august-2022
https://www.nxtbook.com/farran/orthotown/orthotown-june-2022
https://www.nxtbook.com/farran/orthotown/orthotown-may-2022
https://www.nxtbook.com/farran/orthotown/orthotown-april-2022
https://www.nxtbook.com/farran/orthotown/orthotown-march-2022
https://www.nxtbook.com/farran/orthotown/orthotown-january-february-2022
https://www.nxtbook.com/farran/orthotown/orthotown-december-2021
https://www.nxtbook.com/farran/orthotown/orthotown-november-2021
https://www.nxtbook.com/farran/orthotown/orthotown-october-2021
https://www.nxtbook.com/farran/orthotown/orthotown-september-2021
https://www.nxtbook.com/farran/orthotown/orthotown-july-august-2021
https://www.nxtbook.com/farran/orthotown/orthotown-june-2021
https://www.nxtbook.com/farran/orthotown/orthotown-april-2021
https://www.nxtbook.com/farran/orthotown/orthotown-march-2021
https://www.nxtbook.com/farran/orthotown/2021JanuaryFebruary
https://www.nxtbook.com/farran/orthotown/December2020
https://www.nxtbook.com/farran/orthotown/2020November
https://www.nxtbook.com/farran/orthotown/2020October
https://www.nxtbook.com/farran/orthotown/2020September
https://www.nxtbook.com/farran/orthotown/2020JulyAugust
https://www.nxtbook.com/farran/orthotown/2020June
https://www.nxtbook.com/farran/orthotown/2020May
https://www.nxtbook.com/farran/orthotown/2020April
https://www.nxtbook.com/farran/orthotown/2020March
https://www.nxtbook.com/farran/orthotown/2020JanuaryFebruary
https://www.nxtbook.com/farran/orthotown/2019December
https://www.nxtbook.com/farran/orthotown/2019November
https://www.nxtbook.com/farran/orthotown/2019October
https://www.nxtbook.com/farran/orthotown/2019September
https://www.nxtbook.com/farran/orthotown/2019JulyAugust
https://www.nxtbook.com/farran/orthotown/2019June
https://www.nxtbook.com/farran/orthotown/2019May
https://www.nxtbook.com/farran/orthotown/2019April
https://www.nxtbook.com/farran/orthotown/2019March
https://www.nxtbook.com/farran/orthotown/2019JanFeb
https://www.nxtbook.com/farran/orthotown/2018December
https://www.nxtbook.com/farran/orthotown/2018November
https://www.nxtbook.com/farran/orthotown/2018October
https://www.nxtbook.com/farran/orthotown/2018September
https://www.nxtbook.com/farran/orthotown/2018August
https://www.nxtbook.com/farran/orthotown/2018June
https://www.nxtbook.com/farran/orthotown/2018May
https://www.nxtbook.com/farran/orthotown/2018April
https://www.nxtbook.com/farran/orthotown/2018March
https://www.nxtbook.com/farran/orthotown/2018February
https://www.nxtbook.com/farran/orthotown/2017December
https://www.nxtbook.com/farran/orthotown/2017November
https://www.nxtbook.com/farran/orthotown/2017October
https://www.nxtbook.com/farran/orthotown/2017September
https://www.nxtbook.com/farran/orthotown/August_2017
https://www.nxtbook.com/farran/orthotown/2017June
https://www.nxtbook.com/farran/orthotown/2017May
https://www.nxtbook.com/farran/orthotown/2017April
https://www.nxtbook.com/farran/orthotown/March2017
https://www.nxtbook.com/farran/orthotown/2017JanFeb
https://www.nxtbook.com/farran/orthotown/2016_December_Orthotown
https://www.nxtbook.com/farran/orthotown/2016November
https://www.nxtbook.com/farran/orthotown/2016October
https://www.nxtbook.com/farran/orthotown/2016september
https://www.nxtbook.com/farran/orthotown/2016august
https://www.nxtbook.com/farran/orthotown/2016june
https://www.nxtbook.com/farran/orthotown/2016may
https://www.nxtbook.com/farran/orthotown/2016april
https://www.nxtbook.com/farran/orthotown/2016march
https://www.nxtbook.com/farran/orthotown/2016february
https://www.nxtbook.com/farran/orthotown/2015december
https://www.nxtbook.com/farran/orthotown/2015november
https://www.nxtbook.com/farran/orthotown/2015october
https://www.nxtbook.com/farran/orthotown/2015september
https://www.nxtbook.com/farran/orthotown/2015august
https://www.nxtbook.com/farran/orthotown/2015june
https://www.nxtbook.com/farran/orthotown/2015may
https://www.nxtbook.com/farran/orthotown/2015april
https://www.nxtbook.com/farran/orthotown/2015march
https://www.nxtbook.com/farran/orthotown/2015february
https://www.nxtbook.com/farran/orthotown/2014december
https://www.nxtbook.com/farran/orthotown/2014november
https://www.nxtbook.com/farran/orthotown/2014october
https://www.nxtbook.com/farran/orthotown/2014september
https://www.nxtbook.com/farran/orthotown/2014august
https://www.nxtbook.com/farran/orthotown/2014june
https://www.nxtbook.com/farran/orthotown/2014may
https://www.nxtbook.com/farran/orthotown/2014april
https://www.nxtbook.com/farran/orthotown/march2014
https://www.nxtbook.com/farran/orthotown/2014february
https://www.nxtbook.com/farran/orthotown/2013december
https://www.nxtbook.com/farran/orthotown/2013november
https://www.nxtbook.com/farran/orthotown/2013october
https://www.nxtbook.com/farran/orthotown/2013september
https://www.nxtbook.com/farran/orthotown/2013august
https://www.nxtbook.com/farran/orthotown/2013june
https://www.nxtbook.com/farran/orthotown/2013may
https://www.nxtbook.com/farran/orthotown/2013april
https://www.nxtbook.com/farran/orthotown/2013march
https://www.nxtbook.com/farran/orthotown/2013janfeb
https://www.nxtbook.com/farran/orthotown/2012december
https://www.nxtbook.com/farran/orthotown/2012november
https://www.nxtbook.com/farran/orthotown/2012october
https://www.nxtbookmedia.com