ORAL HEALTH EVIDENCE-BASED PRACTICE PROGRAM
|
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) 17555182 | Schmidlin/2007 | N/A | Laboratory Study using extracted teeth | Key results | 80 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) 9484144 | Holan/1997 | N/A | Laboratory Study using extracted teeth | Key results | MO 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: |
03/31/2010 |
E-mail |
bernala@livemail.uthscsa.edu |
Author |
Adrian Bernal |
Co-author(s) |
|
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
(FOR PRACTICING DENTISTS', FACULTY, RESIDENTS and/or STUDENTS COMMENTS ON PUBLISHED CATs) |
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. | |
|
|