Orthotown December 2020 - 42
continuing education
Slop-py Work
Calculating theoretical torque loss utilizing
rectangular and square-shaped archwires
Short course description
This course describes a method to simply calculate theoretical " slop, " assuming that absolute archwire stiffness,
perfect archwires and bracket slot geometry exist. It explores the relative slop between different archwire options and
signifies the importance of forces in a clinical orthodontic setting.
Abstract
Educational objectives
Torque in the orthodontic field is controlled by
rectangular slots in the bracket which accommodate
rectangular archwires and is expressed when an archwire
comes into contact with the walls within a slot and a
force couple is formed. In order for desirable physiologic
forces to be maintained, a certain degree of slop between
the wire and bracket interface is necessary. The formula
in this paper simply calculates theoretical slop, assuming
that absolute archwire stiffness, perfect archwires and
bracket slot geometry exist.
The degrees of slop were calculated for the different
dimensional square and rectangular archwires in 0.022- and
0.018-inch bracket slot systems and varied significantly.
Dimensional precision of brackets and archwires is required
to take both torque expression and the wire/slot play
into account. Torque must be adjusted in a controlled
manner so biological tooth movements can still occur.
The relative slop between different archwire options is
significant to our understanding of forces and positively
improves the clinical accuracy in the orthodontic field.
After finishing this course, readers should understand:
1. Why third-order movements involving
torque are most effectively expressed using
rectangular archwires.
2. What type of movement is controlled
by rectangular slots and accommodates
rectangular archwires.
3. The relative degrees of slop between
different archwire dimensions within
a given bracket system.
4. Why an archwire with height that more
closely approximates the bracket slot height
corresponds to a lesser degree of slop.
5. Why 0.022-inch bracket slot systems
introduce more slop with the same dimension
archwire and affect the range of archwires.
6. The formula proposed in this course and
how it provides a simple way to mathematically
define the degree of theoretical torque loss, or slop.
Farran Media is an ADA CERP Recognized Provider. ADA CERP is a service of the American Dental Association to assist
dental professionals in identifying quality providers of continuing dental education. ADA CERP does not approve or
endorse individual courses or instructors nor does it imply acceptance of credit hours by boards of dentistry.
42
DECEMBER 2020 // orthotown.com
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Orthotown December 2020
Table of Contents for the Digital Edition of Orthotown December 2020
Embrace Progress
Poll: Small Equipment and Supplies
Message Board: Class II Div 1 Deep Bite Teen Aligner Case
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Office Visit: Dr. Jason Battle
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Ad Index
Continuing Education: Slop-py Work
Orthotown December 2020 - Cover1
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Orthotown December 2020 - Embrace Progress
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Orthotown December 2020 - Poll: Small Equipment and Supplies
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Orthotown December 2020 - Message Board: Class II Div 1 Deep Bite Teen Aligner Case
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Orthotown December 2020 - Message Board: Extraction Mx 6
Orthotown December 2020 - Office Visit: Dr. Jason Battle
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Orthotown December 2020 - 5 To Grow On
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Orthotown December 2020 - Ad Index
Orthotown December 2020 - Continuing Education: Slop-py Work
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