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.
Department of Dental Materials and Prosthodontics, UNESP-São Paulo State University, Araraquara, SP, Brazil.
Cassia Bellotto
CB
Correa
Juliana Rico
JR
Pires
Romeu Belon
RB
Fernandes-Filho
Rafael
R
Sartori
Luis Geraldo
LG
Vaz
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