DentaltownUK August 2017 - 14

it failed to take hold as a true replacement for
traditional 'round' rotary instrumentation
systems.7-9 There were technical issues with
the motor/pumping system, the amount of
time to perform the RCT, and more. It has
gained a significant global footprint once
the issues were obviated, however.
The manipulation of the metallurgical
properties of nickel titanium by thermomechanical processing and alloying treatments
has led to the most significant iteration in
the manufacture of endodontic files. The
transition from the martensite phase to the
austenite phase is dependent on temperature
and stress-not time-because there is
no diffusion involved. It is the reversible
diffusionless transition between these two
phases that results in the special properties.
Unfortunately, fracture still occurs because
of cyclic fatigue and torsional failure when
the elastic limit is exceeded (Fig. 5a).
The new generation of NiTi alloys have
transformation temperatures much higher
than those of conventional austenitic materials used in previous generations of rotary
instruments, and will transform at close to
body temperature.
A recent study of commonly used NiTi
endodontic files showed that a temperature
increase to 37 degrees Celsius, simulating
body temperature, substantially decreased
the fracture resistance of all instruments
tested-the temperature effect on the latest
generation of nickel-titanium files (Fig. 5b).10

Fig. 5a. The revolution in endodontic instrumentation imparted by the first generation of NiTi
instruments related to their shape memory and super elasticity. Despite the advantages, these files
were susceptible to fracture due to fatigue and torsional failure.

Fig. 5b. Heat treatment (thermal processing) is one of the most fundamental approaches in adjusting the
transition temperatures of nickel titanium alloys and affecting the fatigue resistance of NiTi endodontic
files. Newer alloys such as MaxWire transforming close to body temperature have demonstrated superior
resistance to cyclic fatigue and torsional failure.

Unique endo instruments
Brasseler's XP-3D instruments feature an
MaxWire alloy that allows the martensitic
instrument to transform to a predetermined
austenitic shape at body temperature.
In the absence of a solid core, this system
allows the tooth to dictate the canal configuration achievable and allows for thorough
cleaning. (Fig. 6 details various features of
the XP-3D Shaper.)
The booster tip lead section fits into
the pre-established glide path, ensuring
precise guidance and centering of the instrument. A traditional glide path instrument
is used consistent with a .15/.02 (size/taper)
Continued on p. 16

14

AUGUST 2017 // dentaltownuk.com

Fig. 6. An overview of the unique features of the XPendo Shaper are demonstrated. The discontinuous
adaptive debridement motion kinesis mimics Schilder's envelope of motion exactly.


http://www.dentaltownuk.com

Table of Contents for the Digital Edition of DentaltownUK August 2017

Cover
On Dentaltown.com
Editorial with Mike Gow
Meet the Team
Howard Speaks: Drive-Thrus and Dentistry
Endodontic Reboot: Part One
Classified Listings
Brand Advertising
A United Voice
Adhesion in Primary Dentition Restorative Dentistry
Additive Dentistry
Zero Moment of Truth
Through the Keyhole
Message Boards: Re-treats question
Due Diligence—A Vendor's Perspective
Message Boards: Antibiotics after Surgical Extraction
Adding Value to the Patient Experience
Lifestyle
Poll: General Dentistry
CE Update
Students Section
Wishlist
DentaltownUK August 2017 - Cover
DentaltownUK August 2017 - Cover2
DentaltownUK August 2017 - 3
DentaltownUK August 2017 - 4
DentaltownUK August 2017 - On Dentaltown.com
DentaltownUK August 2017 - Editorial with Mike Gow
DentaltownUK August 2017 - 7
DentaltownUK August 2017 - Meet the Team
DentaltownUK August 2017 - 9
DentaltownUK August 2017 - Howard Speaks: Drive-Thrus and Dentistry
DentaltownUK August 2017 - 11
DentaltownUK August 2017 - Endodontic Reboot: Part One
DentaltownUK August 2017 - 13
DentaltownUK August 2017 - 14
DentaltownUK August 2017 - Classified Listings
DentaltownUK August 2017 - 16
DentaltownUK August 2017 - 17
DentaltownUK August 2017 - 18
DentaltownUK August 2017 - 19
DentaltownUK August 2017 - 20
DentaltownUK August 2017 - 21
DentaltownUK August 2017 - 22
DentaltownUK August 2017 - Brand Advertising
DentaltownUK August 2017 - 24
DentaltownUK August 2017 - A United Voice
DentaltownUK August 2017 - Adhesion in Primary Dentition Restorative Dentistry
DentaltownUK August 2017 - 27
DentaltownUK August 2017 - 28
DentaltownUK August 2017 - 29
DentaltownUK August 2017 - 30
DentaltownUK August 2017 - 31
DentaltownUK August 2017 - Additive Dentistry
DentaltownUK August 2017 - 33
DentaltownUK August 2017 - Zero Moment of Truth
DentaltownUK August 2017 - 35
DentaltownUK August 2017 - 36
DentaltownUK August 2017 - Through the Keyhole
DentaltownUK August 2017 - 38
DentaltownUK August 2017 - 39
DentaltownUK August 2017 - 40
DentaltownUK August 2017 - 41
DentaltownUK August 2017 - Message Boards: Re-treats question
DentaltownUK August 2017 - 43
DentaltownUK August 2017 - 44
DentaltownUK August 2017 - 45
DentaltownUK August 2017 - 46
DentaltownUK August 2017 - 47
DentaltownUK August 2017 - 48
DentaltownUK August 2017 - 49
DentaltownUK August 2017 - 50
DentaltownUK August 2017 - 51
DentaltownUK August 2017 - Due Diligence—A Vendor's Perspective
DentaltownUK August 2017 - 53
DentaltownUK August 2017 - 54
DentaltownUK August 2017 - 55
DentaltownUK August 2017 - Message Boards: Antibiotics after Surgical Extraction
DentaltownUK August 2017 - 57
DentaltownUK August 2017 - 58
DentaltownUK August 2017 - 59
DentaltownUK August 2017 - Adding Value to the Patient Experience
DentaltownUK August 2017 - 61
DentaltownUK August 2017 - Lifestyle
DentaltownUK August 2017 - 63
DentaltownUK August 2017 - 64
DentaltownUK August 2017 - 65
DentaltownUK August 2017 - 66
DentaltownUK August 2017 - 67
DentaltownUK August 2017 - 68
DentaltownUK August 2017 - 69
DentaltownUK August 2017 - 70
DentaltownUK August 2017 - 71
DentaltownUK August 2017 - 72
DentaltownUK August 2017 - 73
DentaltownUK August 2017 - Poll: General Dentistry
DentaltownUK August 2017 - 75
DentaltownUK August 2017 - CE Update
DentaltownUK August 2017 - 77
DentaltownUK August 2017 - Students Section
DentaltownUK August 2017 - 79
DentaltownUK August 2017 - 80
DentaltownUK August 2017 - 81
DentaltownUK August 2017 - 82
DentaltownUK August 2017 - 83
DentaltownUK August 2017 - 84
DentaltownUK August 2017 - 85
DentaltownUK August 2017 - 86
DentaltownUK August 2017 - 87
DentaltownUK August 2017 - Cover4
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