View the CAT printer-friendly / share this CAT
Title Beveling of Proximal Cavo-Surface Margins Reduces Microleakage
Clinical Question In healthy patients requiring class II composite restorations, does internal or external beveling on enamel for proximal box cavo-surface margins reduce the incidence of microleakage, compared to not beveling these surfaces?
Clinical Bottom Line Beveling cavosurface margins improves marginal adaptation in order to reduce microleakage. (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) 17555182Schmidlin/2007N/ALaboratory Study using extracted teeth
Key results80 box Class II cavities were prepared mesially and distally in 40 extracted human molars using diamond burs. They were filled with hybrid composite resins in three increments and subsequently cured. Marginal quality was assessed using scanning electron microscopy and compared statistically. Beveling resulted in higher values for continuous margins compared to unbeveled controls.
#2) 9484144Holan/1997N/A Laboratory Study using extracted teeth
Key resultsMO and DO cavity preparations were prepared in 25 extracted permanent premolars. The cervical margins were butt joints for the control groups and internal bevels placed for experimental groups in each tooth. All preparations were filled with Z100 resin composite, then underwent thermo-cycling, and finally immersed in basic fuscin for 24 hours. Dye penetration was scored and the control group showed 32% of teeth with dye penetration. Severe dye penetration was found in only four teeth (16%) of the experimental group and 12 (48%) of the controls.
Evidence Search "Dental Cavity Preparation/methods"[Mesh] AND "Composite Resins"[Mesh] AND bevel* ...view in PubMed
Comments on
The Evidence
Both studies were in vitro. There is a need for clinical studies to verify these results. For the Schmidlin study there was a >90% completion rate. There were four different ways in which the molars were prepared however each molar was assessed in the same manner. Compliance was adequate and recall bias is unlikely. For the Holan study there was also a >90% completion rate. Compliance was adequate and all molars were treated the same.
Applicability The evidence would apply to everyday operative dentistry procedures in preparing proximal boxes for class II preparations.
Specialty/Discipline (General Dentistry)
Keywords Margin quality, Evidence-based treatment, Surface treatment
ID# 567
Date of submission: 03/31/2010spacer
E-mail bernala@livemail.uthscsa.edu
Author Adrian Bernal
Co-author(s) e-mail
Faculty mentor/Co-author Rita Renee Parma, DDS
Faculty mentor/Co-author e-mail PARMA@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
Comments and Evidence-Based Updates on the CAT
post a comment
by Ulysses Vargas (San Antonio, TX) on 04/20/2012
A recent PubMed search regarding this topic was performed and completed in April 2012. The listed publications for this CAT are still the most recent and provide the highest level of evidence for the clinical question.

Return to Found CATs list