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Title Fracture Resistance Of Large Amalgam Bonded Restorations Compared To Smaller Restorations
Clinical Question In amalgam bonded restorations, do larger restorations have more fracture resistance than smaller restorations that use the same materials?
Clinical Bottom Line It is not clear whether or not larger restorations that use bonded amalgam have more fracture resistance than smaller restorations that use bonded amalgam when compared directly, but when small preparations have added retention features (thus making a larger preparation) there seems to be better fracture resistance. (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) 11005902Yaman/2000Laboratory, Ninety sound, caries-free human maxillary premolars were divided into 9 groupsLaboratory Study
Key resultsThe addition of retention grooves in amalgam bonded restorations proved to be effective in the fracture resistance although it was not statistically significant from those without retention grooves.
Evidence Search ((restoration[All Fields] AND (("fractures, bone"[MeSH Terms] OR ("fractures"[All Fields] AND "bone"[All Fields]) OR "bone fractures"[All Fields] OR "fracture"[All Fields]) AND resistance[All Fields])) AND ("retention (psychology)"[MeSH Terms] OR ("retention"[All Fields] AND "(psychology)"[All Fields]) OR "retention (psychology)"[All Fields] OR "retention"[All Fields])) AND amalgam[All Fields] ...view in PubMed
Comments on
The Evidence
("Amalgambond" [Supplementary Concept]) OR "Dental Amalgam"[Mesh] AND Fracture
Applicability Findings are applicable to patients requiring restorations with bonded amalgam
Specialty/Discipline (General Dentistry) (Restorative Dentistry)
Keywords Bonded Amalgam, Fracture Resistance, Preparation Design/Size
ID# 844
Date of submission: 04/08/2011spacer Revised: 01/05/2012
E-mail balser@livemail.uthscsa.edu
Author Christopher Balser
Co-author(s) e-mail
Faculty mentor/Co-author Ridley Ross, DDS
Faculty mentor/Co-author e-mail rossr@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
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by Kevin Farnsworth and Jordan Felkner (San Antonio, TX) on 11/14/2014
A PubMed and Trip Database search in Oct 2014 revealed no new research on this topic. This CAT addresses the fracture resistance of large bonded amalgam restorations compared to smaller amalgam bonded restorations. These bonded amalgam restorations, whether larger or smaller, have the same fracture resistance. The only factor that adds resistance to these restorations is adding retention features to the prep design.

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