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Investigation  of  Antibacterial  Properties  during  Hardening  of  Dental Cements 

Secondary caries is a major cause of revision and replacements of dental materials. 

There  are  several  species  of  bacteria  which  are  involved  in  the  formation  of  secondary caries, where Streptococcus mutans is one of the most frequent. Thus, it is  quite practical to evaluate the effect on antibacterial activity of dental cements using  Streptococcus  mutans.  In  this  investigation,  six  different  dental  cements  were  evaluated:  RelyX

TM

  Unicem  self‐adhesive  universal  resin  cement,  Ketac

TM 

Cem  Aplicap

TM

  glass  ionomer  luting  cement,  Harvard  zinc  phosphate  cement,  Ceramir® 

Crown & Bridge, Calcium Aluminate and Glass Ionomer cement. Compared with the  control  group,  Calcium  Aluminate  and  Ceramir  cements  demonstrated  strongest  antibacterial properties in a long period time, while Glass Ionomer Cement and Ketac  Cem  exhibited  no  antibacterial  properties.  Zinc  phosphate  and  RelyX  Unicem  show  little antibacterial properties.   

The antibacterial properties of dental materials may be attributed to the pH during  setting  and  after  maturation,  and  release  of  ions,  such  as  fluoride  ions.  During  this  study,  antibacterial  effects  of  different  pH  and  different  concentrations  of  fluoride  were also investigated. The changing of pH value during and after setting of dental  cements  and  the  release  of  fluoride  ions  from  cements  contributes  to  the  antibacterial  properties,  and  these  effects  are  used  to  try  to  explain  antibacterial  properties of each dental material.   

 

Xiyuan Jiang 

Degree project in applied biotechnology, Master of Science (2 years), 2011  Examensarbete i tillämpad bioteknik 30 hp till masterexamen, 2011 

Biology Education Centre and Biology Education Centre and Department of  Engineering Sciences, 

Uppsala University, Uppsala University 

Supervisor: Håkan Engqvist 

References

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