Dentaltown September 2016 - 55
strength of the crown increases by the square
of its total thickness-even if the crown is
made of a weaker material, such as porcelain.
Bilayer prostheses are just as durable as
full-thickness prostheses, as shown in studies
that tested single load-to-failure and fatigue
failure under water.1 So by understanding
the clinical indications of specific ceramics,
clinicians can be more certain of which ones
can be used for particular applications by
matching the fracture toughness with an
existing and known material.
Fracture toughness is consistent,
but a material's "strength" varies
Strength alone is not a good predictor
of a material's clinical indications, because
it is determined by both fracture toughness
and the size of any flaws. While strength is
derived partly from fracture toughness, it's
also extremely sensitive to surface condition,
and can vary a thousandfold depending on
how a specimen has been made. Strength
measurement doesn't take into account
variables that can be very influential in crown
failure, such as the effects of water, cement,
a laboratory or clinical surface treatment
(e.g., sandblasting, etching, silanization),
or the elastic modulus of the cement and
build-up material.
Fracture toughness, meanwhile, is more
inherent. This makes it more predictive of the
durability of single crowns, and it correlates
with marginal integrity and attritive wear
of resin-based composites.
As data is collected, expect
a new required measurement
to be added to materials
The dental industry now has at least
five-and often up to 10-years of clinical
data about existing all-ceramic systems or
closely related ones.2 With this information,
the ISO standard committee working group
has developed a novel classification scheme
for the 2008 revision of ISO 6872, based
on indications from clinical data. As part
of this, researchers also introduced fracture
toughness-although still in an annex-
which eventually will become a required
measurement.
In the meantime, clinicians can help
to move the profession forward by asking
manufacturer representatives about the
fracture toughness of products at shows
and during office visits. ■
References
1.
Dibner and Kelly, J Prosthet Dent, 2016
2.
Della Bona and Kelly, JADA, 2008
SEVNB depth of cut measurements for analyzing fracture toughness testing
FREE FACTS, circle 24 on card
dentaltown.com \\ SEPTEMBER 2016
55
http://www.dentaltown.com
Table of Contents for the Digital Edition of Dentaltown September 2016
On Dentaltown.com
Howard Speaks: Customer Returns—The Good Kind
Professional Courtesy: A Ton of Trouble for a Free Toothbrush
Continuing Education Update
New Products
Monthly Poll: Equipment
Implant into Root Tip?
Mandible Radiolucency Routine Pano
Handoffs
Second Opinion: To Floss or Not to Floss? That Isn’t the Question
Test Your Reading Comprehension: How well can you interpret what’s visible in dental radiographs?
Understanding Fracture Toughness
The Right Stuff: Your checklist for adopting new software technology
Electronic Health Records: Is it time to make the transition?
Permanent Help for Temporary Employees: The right practice management software can make all the difference
A Complex Restorative Case
Making Friends with Benefits: How to understand what employee perks are really worth—and which ones
Scoring the Perfect Patient Handoff
The Road to Greatness
Industry News
Product Profile: ClearCorrect
The Five Risk Factors of Improper Ergonomics
CE: Laser Mucocele Removal in Pediatric Patients
Dentally Incorrect
Dentaltown September 2016 - Intro
Dentaltown September 2016 - Cover1
Dentaltown September 2016 - Cover2
Dentaltown September 2016 - 1
Dentaltown September 2016 - 2
Dentaltown September 2016 - 3
Dentaltown September 2016 - 4
Dentaltown September 2016 - 5
Dentaltown September 2016 - 6
Dentaltown September 2016 - 7
Dentaltown September 2016 - On Dentaltown.com
Dentaltown September 2016 - 9
Dentaltown September 2016 - Howard Speaks: Customer Returns—The Good Kind
Dentaltown September 2016 - 11
Dentaltown September 2016 - 12
Dentaltown September 2016 - 13
Dentaltown September 2016 - Professional Courtesy: A Ton of Trouble for a Free Toothbrush
Dentaltown September 2016 - 15
Dentaltown September 2016 - 16
Dentaltown September 2016 - 17
Dentaltown September 2016 - Continuing Education Update
Dentaltown September 2016 - 19
Dentaltown September 2016 - 20
Dentaltown September 2016 - 21
Dentaltown September 2016 - New Products
Dentaltown September 2016 - 23
Dentaltown September 2016 - Monthly Poll: Equipment
Dentaltown September 2016 - 25
Dentaltown September 2016 - 26
Dentaltown September 2016 - 27
Dentaltown September 2016 - Implant into Root Tip?
Dentaltown September 2016 - 29
Dentaltown September 2016 - 30
Dentaltown September 2016 - 31
Dentaltown September 2016 - 32
Dentaltown September 2016 - 33
Dentaltown September 2016 - 34
Dentaltown September 2016 - 35
Dentaltown September 2016 - Mandible Radiolucency Routine Pano
Dentaltown September 2016 - 37
Dentaltown September 2016 - 38
Dentaltown September 2016 - 39
Dentaltown September 2016 - 40
Dentaltown September 2016 - 41
Dentaltown September 2016 - Handoffs
Dentaltown September 2016 - 43
Dentaltown September 2016 - 44
Dentaltown September 2016 - 45
Dentaltown September 2016 - 46
Dentaltown September 2016 - 47
Dentaltown September 2016 - Second Opinion: To Floss or Not to Floss? That Isn’t the Question
Dentaltown September 2016 - 49
Dentaltown September 2016 - Test Your Reading Comprehension: How well can you interpret what’s visible in dental radiographs?
Dentaltown September 2016 - 51
Dentaltown September 2016 - 52
Dentaltown September 2016 - 53
Dentaltown September 2016 - Understanding Fracture Toughness
Dentaltown September 2016 - 55
Dentaltown September 2016 - The Right Stuff: Your checklist for adopting new software technology
Dentaltown September 2016 - 57
Dentaltown September 2016 - 58
Dentaltown September 2016 - 59
Dentaltown September 2016 - 60
Dentaltown September 2016 - 61
Dentaltown September 2016 - Electronic Health Records: Is it time to make the transition?
Dentaltown September 2016 - 63
Dentaltown September 2016 - 64
Dentaltown September 2016 - 65
Dentaltown September 2016 - Permanent Help for Temporary Employees: The right practice management software can make all the difference
Dentaltown September 2016 - 67
Dentaltown September 2016 - A Complex Restorative Case
Dentaltown September 2016 - 69
Dentaltown September 2016 - 70
Dentaltown September 2016 - 71
Dentaltown September 2016 - 72
Dentaltown September 2016 - 73
Dentaltown September 2016 - 74
Dentaltown September 2016 - 75
Dentaltown September 2016 - Making Friends with Benefits: How to understand what employee perks are really worth—and which ones
Dentaltown September 2016 - 77
Dentaltown September 2016 - 78
Dentaltown September 2016 - 79
Dentaltown September 2016 - 80
Dentaltown September 2016 - 81
Dentaltown September 2016 - 82
Dentaltown September 2016 - 83
Dentaltown September 2016 - Scoring the Perfect Patient Handoff
Dentaltown September 2016 - 85
Dentaltown September 2016 - 86
Dentaltown September 2016 - 87
Dentaltown September 2016 - 88
Dentaltown September 2016 - 89
Dentaltown September 2016 - The Road to Greatness
Dentaltown September 2016 - 91
Dentaltown September 2016 - 92
Dentaltown September 2016 - Industry News
Dentaltown September 2016 - Product Profile: ClearCorrect
Dentaltown September 2016 - 95
Dentaltown September 2016 - 96
Dentaltown September 2016 - 97
Dentaltown September 2016 - The Five Risk Factors of Improper Ergonomics
Dentaltown September 2016 - 99
Dentaltown September 2016 - 100
Dentaltown September 2016 - 101
Dentaltown September 2016 - 102
Dentaltown September 2016 - 103
Dentaltown September 2016 - CE: Laser Mucocele Removal in Pediatric Patients
Dentaltown September 2016 - 105
Dentaltown September 2016 - 106
Dentaltown September 2016 - 107
Dentaltown September 2016 - 108
Dentaltown September 2016 - 109
Dentaltown September 2016 - 110
Dentaltown September 2016 - 111
Dentaltown September 2016 - Dentally Incorrect
Dentaltown September 2016 - Cover3
Dentaltown September 2016 - Cover4
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