alterações de cor, sem significância estatística (p>0,05). A resina Solidex foi a que apresentou maior valor de alteração de cor (ΔE = 4,31), e que apresentou um padrão de rugosidade (Ra= 0,079) estatisticamente diferente das resinas Art-Glass (Ra=0,141) e Targis (Ra=0,124) (p<0,001). Conclusão: Todas as resinas apresentaram alteração de cor e aumento de rugosidade após o envelhecimento artificial acelerado. A resina Solidex apresentou a maior alteração de cor e a menor rugosidade após o envelhecimento acelerado. ABSTRACT This study had the aim of assessing in vitro color change and surface roughness of three brands of new generation indirect resins, after being submitted to accelerated aging process. Twelve specimens were constructed (15 mm diameter and 2 mm width) for the resins: Artglass (Heraeus Kulzer), Solidex (Shofu), Targis (Ivoclar Vivadent) which were finished and polished with the disks Sof-Lex -3M. The first measurements for the roughness and spectrophotometer colorimeter tests were performed, respectively, with the Surfcorder Profilometer SE 1700 (Kosakalab) and Spectrophotometer PCB 6807 (BYK GARDNER), which uses the scale CIE L*a*b* for color determination. The samples were submitted to the accelerated artificial aging process for 384 hours, and then submitted once again to the process of color and roughness reading. Color stability was determined by the difference (ΔE)between coordinates L*, a*, and b* obtained from the samples before and after aging. The results were submitted to ANOVA (Tukey) and showed that all resins presented color changes with no statistical significance (p>0.05). Solidex resin showed the highest value of color change (ΔE = 4.31), and a roughness pattern (Ra= 0.079) statistically different from the resins Art-Glass (Ra=0.141) and Targis (Ra=0.124) (p<0,001).
A clear understanding of the epidemiology of Candida infection seems to be important, because even when successfully treated, recurrence is very common. The objective of the present study was to evaluate the influence of yeast density for clinical signs of development of oral candidiasis. Oral mucosa was examined for clinical signs of candidiasis, and pooled unstimulated saliva from 100 volunteers, was used for the evaluation of Candida density. No treatment or intervention was made at this point, but the relative risk for candidiasis development was calculated. The results pointed that yeast density may be a major factor in the development of candidiasis relative risk = 12.17 when Candida density is >1x10³. Among associated factors, the higher relative risk was the presence of prosthesis; followed by: 1) individuals >45 years of age, 2) women, 3) people with compromised general health and/or on medications. The results support the hypothesis that predisposing conditions are significant in Candida species carrier status, but the density of Candida may be the primary factor for the development of candidiasis. Because of these results we suggest that the density of Candida must be carefully controlled in patients presenting predisposing factors.
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