Fatigue and fluoride corrosion on Streptococcus mutans adherence to titanium-based implant/component surfaces.
OBJECTIVE
The influence of fatigue and the fluoride ion corrosion process on Streptococcus mutans adherence to commercially pure Titanium (Cp Ti) implant/component set surfaces were studied.


METHODS
Thirty Nobel implants and 30 Neodent implants were used. Each commercial brand was divided into three groups. Group A: control, Group B: sets submitted to fatigue (10(5) cycles, 15 Hz, 150 N), and Group C: sets submitted to fluoride (1500 ppm, pH 5.5) and fatigue, simulating a mean use of 5 years in the oral medium. Afterward, the sets were contaminated with standard strains of S. mutans (NTCC 1023) and analyzed by scanning electronic microscopy (SEM) and colony-forming unit counts (CFU/mL).


RESULTS
By SEM, bacterial adherence was verified only in group C in both brands. By CFU/mL counts, S. mutans was statistically higher in both brands in group C than in groups A and B (p < 0.05, ANOVA).


CONCLUSIONS
The process of corrosion by fluoride ions on Cp Ti implant/component sets allowed greater S. mutans adherence than in the absence of corrosion and with the fatigue process in isolation.
Correa
Cassia Bellotto
CB
Department of Dental Materials and Prosthodontics, UNESP-São Paulo State University, Araraquara, SP, Brazil.
Pires
Juliana Rico
JR
Fernandes-Filho
Romeu Belon
RB
Sartori
Rafael
R
Vaz
Luis Geraldo
LG
D000704:Analysis of Variance; D001422:Bacterial Adhesion; D002327:Cariostatic Agents / Q000737:chemistry; D003343:Corrosion; D015921:Dental Implants / Q000382:microbiology*; D003764:Dental Materials / Q000737:chemistry; D003799:Dental Stress Analysis; D004563:Electrochemistry; D004866:Equipment Contamination; D005459:Fluorides / Q000737:chemistry*; D008422:Materials Testing; D013295:Streptococcus mutans; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
D002327:Cariostatic Agents; D015921:Dental Implants; D003764:Dental Materials; D014025:Titanium; D005459:Fluorides