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more effective within the canal to aid in removing
biologic debris and the smear layer.
The goal is to clean the canal thoroughly and
produce a canal shape that can be fully obturated.
Furthermore, to ensure maximum root strength
during the endodontic procedure, it is important
to remove as little tooth structure as possible.
Endodontic shaping has evolved from hand
instrumentation to engine-driven rotary or
reciprocation. Rotary offers a continuous
360-degree rotation, which can lead to binding
and broken instruments. Due to the possibility
of these iatrogenic incidences, reciprocating
endodontics has become increasingly popular.
Reciprocation moves in a back-and-forth watch-winding motion. A few of the reciprocating
systems on the market include WaveOne and
WaveOne Gold (Dentsply), Reciproc (VDW),
Endo-EZE (UltraDent), as well as Tango-Endo,
Endo-Express, and SafeSiders (Essential Dental
I use the Tango-Endo system. This system
moves in true reciprocation, oscillating at 30
degrees. This particular oscillation is preferable
to that of other reciprocating systems, because
it progressively increases the degree of
movement until reaching full rotation. The
Tango-Endo instrument system virtually
eliminates file separation, providing greater
root canal treatment success.
1. Christensen G. Ask Gordon: What percent of
endodontics is done by GPs? DentistryIQ website.
ask-gordon-what-percent-of-endodontics-is-done-by-gps. Accessed April 26, 2017.
2. Hülsmann M, Stryga F. Comparison of root canal
preparation using different automated devices and
hand instrumentation. J Endod. 1993; 19( 3):141-145.
3. Hülsmann M, Schade M, Schäfers F. A comparative
study of root canal preparation with HERO 642 and
Quantec SC rotary Ni-Ti instruments. Int Endod J.
2001; 34( 7):538-546.
4. Hülsmann M, Gressmann G, Schäfers F. A
comparative study of root canal preparation using
FlexMaster and HERO 642 rotary Ni-Ti instruments. Int
Endod J. 2003; 36( 5):358-366.
5. Versümer J, Hülsmann M, Schäfers F. A comparative
study of root canal preparation using ProFile .04 and
Lightspeed rotary Ni-Ti instruments. Int Endod J.
2002; 35( 1): 37-46.
6. Hülsmann M, Herbst U, Schäfers F. Comparative study
of root-canal preparation using Lightspeed and
Quantec SC rotary Ni Ti instruments. Int Endod J.
2003; 36( 11):748-756.
7. Wu MK, Wesselink PR. A primary observation on
the preparation and obturation of oval canals. Int
Endod J. 2001; 34( 2):137-141.
8. Stuart CH, Schwartz SA, Beeson TJ, Owatz CB.
Enterococcus faecalis: its role in root canal
treatment failure and current concepts in
re-treatment. J Endod. 2006; 32( 2):93-98.
ALLAN S. DEUTSCH, DMD,
FACD, with 40-plus years of clinical
experience, is a lecturer, author, and
top authority in the field. He is the
executive vice president, codirector
of dental research, and cofounder of
Essential Dental Systems, as well as
cofounder of the tristate area’s
Hands-On Dental Education Center. Dr. Deutsch holds 19
patents for coinventing revolutionary endodontic systems.
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