DentaltownUK August 2017 - 20

Continued from p. 18
in the canal is in a mesiodistal dimension
because of internal resorption. The Finisher
enabled removal of debris and tissue in the
irregularity while retaining the original
shape of the canal and preventing further
weakening of the root.

Fig. 10. The image reflects the distal views of 3-D reconstructions of the mesial root canal systems of
four mandibular molars before (green) and after (red) canal preparation with reciprocating instruments.
The figures demonstrate the effectiveness of the Finisher in the apical region.

Fig. 11. The preoperative periapical radiograph shows a mesiodistal resorptive defect. The CBCT images
show that this is internal resorption that also extends buccolingually. The postoperative radiograph
shows that at the second visit the canal is filled completely, which is an indication that the tissue and
debris has been removed. The original shape of the canal has been maintained, and the tooth has not
been further weakened by the cleaning procedure.

20

AUGUST 2017 // dentaltownuk.com

Retreatment considerations
There is a third file in the XP-3D instruments-the XP-3D Finisher R-designed
for retreatment. This file is a #30/.00, making it slightly stiffer and more efficient in
removing root fillings materials adhering to
the canal walls, especially in the curvature
or oval areas. The residual amount of filling material remnants, when a tooth is
retreated, is difficult to calculate; however,
studies using histologic evaluation of teeth
with post-treatment apical periodontitis
show evidence that bacterial colonisation is
associated with the canal remnants.
A new supplementary strategy using a
finishing instrument was evaluated for its
ability to improve filling material removal.
A study showed substantial reduction in
residual contents when the "Mtwo" system
and "Reciproc" system were used for retreatment. The results using the XP-3D
Finisher instrument were encouraging.
The remaining filling volume showed a
69 percent reduction in volume contents.
In canals with residual filling material,
an adjunctive approach with the XP-3D
Finisher instrument significantly enhanced
removal17 (Fig. 12).

Conclusion
Preliminary studies on XP-3D instruments have shown remarkable removal of
soft tissues, fewer dentinal chips residual
in the isthmus and canal walls after instrumentation, and low dentinal stress (fewer
microcracks). The minimally invasive
conservative instrumentation engenders a
low amount of dentin removed coronally,
and efficient debridement and disinfection
of the apical third area.
Have we achieved the ideal fusion of
technology and biology for long-term positive
treatment outcomes? Perhaps.
What has been achieved is a redress of
a design flaw that has persisted for much
too long.
(Editor's note: Part 2 of this series will
address how the use of bioactive materials for
cold hydraulic obturation takes us yet another
step closer to the goal of predictable endodontic
success.) n


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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