Bacterial adhesion to dental amalgam and three resin composites.
OBJECTIVE
The ability of three oral bacteria to adhere to hydrophobic amalgam (water contact angle 60 degrees) and hydrophobic resin composites (Prisma-AP.H 56 degrees. Herculite XRV 82 degrees and Z100 89 degrees) was compared using an in vitro assay.


RESULTS
Following preincubation of the materials with human saliva, X-ray photoelectron spectroscopy showed the surfaces to adsorb carbon and nitrogen-containing compounds in a conditioning film that appeared to block the detection of Na and others in 2100 resin. Hg and Ag in amalgam, Si and Zn in Prisma AP.H resin and Ag and Na in Herculite resin. The precoating of the substrata by a proteinaceous conditioning film led to decreased binding of viable cells of Streptococcus sanguis CH3, Streptococcus salivarius HB and Actinomyces viscosus WG as compared with the adhesion to bare composites. With and without salivary coating, there was a correlation between increased bacterial hydrophobicity and increased retention on the substrata. However, there was no statistical difference in binding to the amalgam compared with the resin composites. In vitro studies showed that the bacteria autoaggregated in the presence of saliva.


CONCLUSIONS
The results indicate the potential ability of normal oral flora to colonize resin composite.
Suljak
J P
JP
Division of Biomaterials Science, University of Western Ontario, London, Canada.
Reid
G
G
Wood
S M
SM
McConnell
R J
RJ
van der Mei
H C
HC
Busscher
H J
HJ
D016924:Actinomyces viscosus / Q000302:isolation & purification / Q000502:physiology; D000704:Analysis of Variance; D001422:Bacterial Adhesion / Q000502:physiology*; D018441:Biofilms; D015169:Colony Count, Microbial; D003188:Composite Resins; D003722:Dental Alloys; D003723:Dental Amalgam; D006801:Humans; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements; D012463:Saliva / Q000502:physiology; D012822:Silicon Dioxide; D013052:Spectrometry, X-Ray Emission; D013291:Streptococcus / Q000302:isolation & purification / Q000502:physiology; D013499:Surface Properties; D017155:Wettability; D015040:Zirconium
D003188:Composite Resins; D003722:Dental Alloys; D019279:Resin Cements; C083568:Z100 composite resin; C065770:Herculite XR; C073466:Prisma APH; C033470:Dispersalloy; D012822:Silicon Dioxide; D003723:Dental Amalgam; D015040:Zirconium