ORAL HEALTH EVIDENCE-BASED PRACTICE PROGRAM
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Title |
Class IV, Bevel Or Chamfer? |
Clinical Question |
In a healthy adult needing a class IV restoration, is a stair-step margin preparation or a beveled margin preparation more resistant to fracture? |
Clinical Bottom Line |
There is no difference in shear strength between the bevel and stair step chamfer margin preparation in a class IV resin composite restoration. (See Comments on the CAT below) |
Best Evidence |
(you may view more info by clicking on the PubMed ID link) |
PubMed ID |
Author / Year |
Patient Group |
Study type
(level of evidence) |
#1) 12739678 | Eid/2002 | Bovine Teeth | Lab study | Key results | ANOVA showed a significant difference in the shear strengths in mega Pascals between the control group (Untreated samples) and the three different preparation techniques P level <0.001, and no significant difference among the different types of preparation P level > 0.05. | |
Evidence Search |
Limits: Humans, Randomized Controlled TrialLimits: Humans, Clinical TrialLimits: Humans, Systematic ReviewsLimits: Humans, Meta-AnalysisSearch "Tooth Fractures"[Mesh]Search "Incisor"[Mesh]Search "Composite Resins"[Mesh]Search ("Tooth Preparation"[Mesh] |
Comments on
The Evidence |
The study was not blinded and took place on bovine extracted teeth. The sample sizes were smaller than we would have liked. |
Applicability |
The healthy adult patient would not receive a major benefit using one of these preparation designs over the other. |
Specialty/Discipline |
(General Dentistry) (Pediatric Dentistry) |
Keywords |
Class IV, chamfer
|
ID# |
853 |
Date of submission: |
04/01/2011 |
E-mail |
desutterb@livemail.uthscsa.edu |
Author |
Brent DeSutter |
Co-author(s) |
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Co-author(s) e-mail |
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Faculty mentor/Co-author |
Erica Oliveira, DDS, MPH |
Faculty mentor/Co-author e-mail |
OLIVEIRAE@uthscsa.edu |
Basic Science Rationale
(Mechanisms that may account for and/or explain the clinical question, i.e. is the answer to the clinical question consistent with basic biological, physical and/or behavioral science principles, laws and research?) |
post a rationale |
None available | |
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Comments and Evidence-Based Updates on the CAT
(FOR PRACTICING DENTISTS', FACULTY, RESIDENTS and/or STUDENTS COMMENTS ON PUBLISHED CATs) |
post a comment |
by Saba Ghazal (San Antonio, TX) on 10/03/2014 A PubMed search on fracture resistance of bevel and stair stepped chamfer Class IV composites was performed in September 2014. A more recent publication was found: Xu 2012, PubMed: 22409223. This in vitro study was conducted on sixty extracted bovine teeth and showed similar results as those published in this CAT and, in addition, indicated a stair stepped chamfer or 2mm bevel for better biomechanics and esthetics. | |
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