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Evidence-
Based
Dentistry
Julie Frantsve-Hawley, RDH, PhD
Director, Research Institute and Center for Evidence-Based Dentistry
American Dental Association
Evidence
Patients needs &
preferences
Clinical Expertise
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© 2011 American Dental Association, All Rights Reserved
Then….
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© 2011 American Dental Association, All Rights Reserved
Now….
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© 2011 American Dental Association, All Rights Reserved
Information
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© 2011 American Dental Association, All Rights Reserved
Information Overload
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© 2011 American Dental Association, All Rights Reserved
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© 2011 American Dental Association, All Rights Reserved
Evidence-Based Dentistry
Evidence
Patients needs &
preferences
Clinical Expertise
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© 2011 American Dental Association, All Rights Reserved
Evidence-Based Dentistry
• Evidence-based dentistry (EBD) is an approach to oral health care that requires the judicious integration of systematic assessments of clinically relevant scientific evidence, relating to the patient’s oral and medical condition and history, with the dentist’s clinical expertise and the patient’s treatment needs and preferences.
The ADA Definition
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© 2011 American Dental Association, All Rights Reserved
Levels of Evidence
(IA) Systematic Review
(IB) 1+ RCT
(IIA) 1+ controlled study without randomization
(IIB) 1+ quasi-experimental study
(III) Non-experimental descriptive studies
(i.e. comparative, correlation, cohort and case-control studies)
(IV) expert committee reports or opinions or clinical experience of respected authorities
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What is an RCT?
Population
Intervention
Outcome
Control
Outcome
Root Canal Treatment
Randomized Controlled Trial
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Will using a parachute save lives?
People in Airplane
Jump with parachute
Survival
Jump w/o parachute
Survival
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Ask the question
Access the
evidence
Appraise the
evidence
Apply in practice
Assess the
outcome
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• Periodontal disease in
pregnancy is a risk factor
for preeclampsia. Shetty et
al. Acta Obstet Gynecol
Scand. 2010
May;89(5):718-21.
• Maternal periodontal
disease and risk of
preeclampsia: a case-
control study.
Lohsoonthorn et al. Am
J Hypertens. 2009
Apr;22(4):457-63. Epub
2009 Jan 22.
• CONCLUSIONS: This
study provides no
convincing evidence that
periodontal disease is
associated with
preeclampsia risk among
Thai women.
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Systematic Review
Study
Study Study
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Systematic Review
Traditional Review
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© 2011 American Dental Association, All Rights Reserved Egger at al., 2001
Data Analysis
• Qualitative Analysis
– Discussion of individual designs and outcomes
– If study designs are so different that data cannot be combined
• Quantitative Analysis
– Preferred
– Meta-Analysis (Forest Plot)
– Publication bias (Funnel Plot)
– Heterogeneity
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© 2011 American Dental Association, All Rights Reserved
Thrombolytic Therapy
13901
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© 2011 American Dental Association, All Rights Reserved
Meta-analysis is a quantitative approach to
evaluate multiple studies
• Increase sample size
– Evaluating multiple small studies
• When studies disagree
– Magnitude
– Direction
• Enhance scientific credibility
• Using statistical methods to combine the results of different studies
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Sources of Pre-appraised Evidence
Summaries of Systematic Reviews
Guidelines/recommendations
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• A short (1-2 page) summary of a systematic review
• Critical appraisal
• Clinical Applications (some)
• Time saving
• Usually a single author, but peer reviewed
Summaries of
Systematic Reviews
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• Recommendation by an expert panel
• Based on the best evidence available
• Multiple systematic reviews and/or clinical studies
• Critical appraisal
• Implications for practice
Guidelines/ Recommendations
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Benefits of Using Pre-Appraised Evidence
• Fast, simple, efficient
• combines the search and appraisal
processes
• Utilizes appraisals completed by “experts”
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• Where can I find summaries? – EBD.ADA.org
– JADA
– Database of Abstracts of Reviews of Effects (DARE)
– Bandolier
– Evidence-based Dentistry (Nature Publishing Group)
– The Journal of Evidence-based Dental Practice (Elsevier)
• Where can I find Guidelines? – EBD.ADA.org
– Guidelines.gov
– National Institute for Health and Clinical Excellence (NICE)
– Scottish Intercollegiate Guidelines Network (SIGN)
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ebd.ada.org
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• Over 1700 systematic reviews
• Each is 6-200 pages long
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•600-800 words
•Summarizes a systematic reviews
•Clinical implications
Critical Summaries
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© 2011 American Dental Association, All Rights Reserved
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© 2011 American Dental Association, All Rights Reserved
ebd.ada.org
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© 2011 American Dental Association, All Rights Reserved
Levels of Evidence
(IA) Systematic Review
(IB) 1+ RCT
(IIA) 1+ controlled study without randomization
(IIB) 1+ quasi-experimental study
(III) Non-experimental descriptive studies
(i.e. comparative, correlation, cohort and case-control studies)
(IV) expert committee reports or opinions or clinical experience of respected authorities
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© 2011 American Dental Association, All Rights Reserved
Strength of Recommendation
A = Category I Evidence
B = Category II Evidence or
extrapolated from category I evidence
C = Category III Evidence
or extrapolated from category I or II evidence
D = Category IV Evidence
or extrapolated from category I, II, or III evidence
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Strength of Recommendation
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Treatment Decisions
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mobile.ebd.ada.org
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Supported by a grant from the NLM and the NIDCR
(Grant Number G08 LM008956)
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To recruit practitioners to
be local community
leaders helping their
peers implement EBD
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Comments • “Thank you for the privilege and honor to
participate in this meeting, one of the best I’ve attended and one that I believe will produce a lot of fruit in academia, education, research, and practice.”
• “I really enjoyed this experience and initiation into being a champion for EBD. There are high expectations for me to disseminate this information in my dental school, component societies and study clubs. I feel this has been a good preparation for me to go home and start working on this.”
• “Excellent program. The passion in the presenters has to be contagious!”
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September 19-23, 2011
"Perhaps the best course of my dental career.“ "Highly recommend the program . . . a great means of extending the practice of EBD."
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• Write Critical Summaries
for EBD Web site
• Attend 2 day workshop
• Professional development
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Thank you
ebd.ada.org
mobile.ebd.ada.org