Dentaltown May 2017 - 80

Fig. 7a. A traditional NiTi file from round blank is represented by the color red, the XPendo Shaper by
the color blue. The sinusoidal motion of the XPendo Shaper-in contrast to the round file which augurs-
demonstrates the benefit of adaptive debridement. In conjunction with the Finisher, unprecedented
levels of debris removal and disinfection are possible. (Image courtesy of Dr. Gustavo de Deus.)

Fig. 7b. Minimally invasive endodontics.

Fig 8a. Photoelasticity is an experimental technique for stress and strain analysis, useful for conditions
of complicated geometry or loading. As evidenced by the accompanying images, the XPendo Shaper
demonstrates the least stress in the apical third. Internal tests performed at FKG Dentaire, Switzerland.

MAY 2017 // dentaltown.com

Continued from p. 78
instrument. There are no cutting flutes on
the lead section of the booster tip, and the
XP-3D Shaper instrument slips into the
prepared apical component of the glide
path to a depth of 0.25 millimeters. The
next 0.25mm section of the booster tip is
configured with six cutting flutes.
Rotation of these flutes sizes the next
0.25mm of canal space anywhere from
a #25 to #60 tip with the rest of taper
variable, dependent on the desires of the
manufacturer or clinician. In the XP-3D
Shaper the apical size chosen is #30. Thus,
the booster tip enables achieving a #30 tip
size within five swaths after the creation of
the #15/.02 glide path.
The core taper of the XP-3D Shaper
file is .01 and at room temperature in the
martensite form, the file appears and acts in
terms of flexibility and cyclic fatigue like a
traditional #30/.01 solid core file; however,
at body temperature the austenite shape is
snakelike and has a taper of .08 when no
resistance is met. The file now maintains its
properties in terms of flexibility and resistance
to cyclic fatigue of the #30/.01 tapered file,
but can potentially create a shape of #30/.08.
The final taper of the file is time-dependent.
When the file has reached the working
length, it is "squeezed" to a #30/.02 shape.
At body temperature, it will expand to
its austenite shape. It is the resistance of
the dentin that limits its achieving its full
potential, dependent on time.
If after reaching working length the file
is used in with approximately 10 additional
swaths, it will reach a #30/.04 size; 10 more
swaths, a #30/.06, etc. To maintain critical
coronal dentin, dentinal girth, the authors
believe that a #30/.04 shape is ideal. Of
paramount importance: The time of use of
the file is extremely safe in terms of cyclic
fatigue resistance. The snakelike shape of
the fi le and its virtual/adaptive core and
mechanism of use allow the file to adapt to
the true or native shape of the canal.
Fig. 7a demonstrates the difference
between the ability of a standard round
NiTi file to clear a less-than-ideal volume
of intracanal debris, in contrast to the

http://www.dentaltown.com

Table of Contents for the Digital Edition of Dentaltown May 2017