Experiments on in vivo biofilm formation and in vitro adhesion of Candida species on polysiloxane liners.
OBJECTIVE
Microorganisms may colonise polysiloxane soft liners leading to bio-deterioration. The aim of this study was to investigate in vitro adhesion and in vivo biofilm formation of Candida species on polysiloxane surfaces.


METHODS
The materials used in this study were Molloplast B, GC Reline soft, Mollosil Plus, Silagum Comfort and Palapress Vario. The in vitro retention of clinical isolates of Candida albicans to the relining and denture-base materials by microscopic (scanning electron microscopy, SEM), conventional culturing methods and antimicrobial properties of these materials were studied. Candida found on materials and mucosa following long-term use were identified and quantified, and biofilms covering the surfaces were investigated by SEM.


RESULTS
There was a significant decrease in the number of cells attached in vitro to saliva-coated surfaces compared with non-treated surfaces. An oral Candida carriage of 78% was found. Candida albicans, C. glabrata, C. intermedia and C. tropicalis were identified. In vivo biofilm formation on the liners appeared as massive colonisation by microorganisms.


CONCLUSIONS
The results of the in vitro experiments suggest that salivary film influences early colonisation of different C. albicans strains. The film layer also minimises the differences among different strains. The Candida carriage of these patients was similar to denture-wearing patients without soft liners.
Department of Prosthodontics, Faculty of Dentistry, University of Oslo, Oslo, Norway. mmutluay@gmail.com
Mustafa Murat
MM
Mutluay
Serra
S
Oğuz
Dag
D
Ørstavik
Finn
F
Fløystrand
Arife
A
Doğan
Eva
E
Söderling
Timo
T
Närhi
Ingar
I
Olsen
D000180:Acrylic Resins / Q000737:chemistry; D000935:Antifungal Agents / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry*; D018441:Biofilms / Q000254:growth & development*; D002175:Candida / Q000145:classification / Q000502:physiology*; D002176:Candida albicans / Q000302:isolation & purification / Q000502:physiology; D041221:Candida glabrata / Q000302:isolation & purification / Q000502:physiology; D041022:Candida tropicalis / Q000302:isolation & purification / Q000502:physiology; D015169:Colony Count, Microbial; D044622:Dental Pellicle / Q000382:microbiology; D003819:Denture Bases / Q000382:microbiology; D003822:Denture Liners / Q000382:microbiology*; D003823:Denture Rebasing; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D005260:Female; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D005779:Immunodiffusion; D008297:Male; D008422:Materials Testing; D008827:Microbiological Phenomena; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D009172:Mycology / Q000379:methods; D012826:Silicone Elastomers / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry*; D013997:Time Factors
D000180:Acrylic Resins; D000935:Antifungal Agents; D001672:Biocompatible Materials; D004129:Dimethylpolysiloxanes; C020964:MDX 4-4210; C483159:Mollosil Plus; C507521:Palapress Vario; D012826:Silicone Elastomers; D012833:Siloxanes