Dentaltown September 2016 - 54
prosthodontics
feature
SEVNB testing specimen is the ISO standard for measuring fracture toughness.
UNDERSTANDING
FRACTURE TOUGHNESS
by Thomas Hill, PhD
Thomas Hill, PhD, graduated
from the University of Florida in
2001 and earned a doctorate in
material science and engineering
with a focus on ceramics. He
specialized in dental ceramics
at the university while on a National Institutes of
Health grant. For 15 years, Hill has been the manager
of scientific services at Ivoclar Vivadent, where he
oversees the North American Ivoclar-sponsored
clinical trials and in vitro studies. He also mentors
university students, and has been published on
various topics in dental materials. He is a member
of the Academy of Dental Materials and a member of
the ADA committees on development of standards for
dental ceramics and CAD/CAM in dentistry.
54
SEPTEMBER 2016 // dentaltown.com
Today, industry advertisers are increasingly referring to the "fracture toughness"
values of their materials. It's important for
clinicians to understand the relevance of
these values, and how to use that information
when making clinical practice decisions.
How fracture toughness values
can affect layered restorations
The International Organization for
Standardization (ISO) has noticed that
clinical outcomes appear to be related
to the core ceramic's fracture toughness.
"Fracture toughness" describes how hard
it is to drive a crack through a ceramic.
Values range from about 0.8 MPa*m½ for
veneering porcelains to more than 5.0 for
transformation-toughened zirconia. Metals
start at about 14 units and go into the
hundreds, because they can relieve stress
concentration at crack tips, with atomic flow
leading to crack blunting. No such relief
mechanism exists for ceramics, however.
Bilayer restorations can also be governed
by a material's fracture toughness, because
fractures generally start from the intaglio, or
cementation, surface. Stress in the strongest
layer is what matters, and the load-bearing
The Ivoclar Vivadent R&D team spend countless
hours each and every day testing materials
to ensure a high level of care for the dental
industry.
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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