Chromatic changes were exhibited by specimens immersed in red wine, followed by coffee. For Transflex, cola also promoted color changes. The values of color changes converted to National Bureau of Standard units showed them to be perceivable to the human eye.
The long cycle increased the cytotoxicity of Lucitone 550 and water-bath post-polymerisation reduced the cytotoxicity of Lucitone 550 processed by long cycle.
In healthy individuals, Candida species are considered commensal yeasts of the oral cavity. However, these microorganisms can also act as opportunist pathogens, particularly the so-called non-albicans Candida species that are increasingly recognized as important agents of human infection. Several surveys have documented increased rates of C. glabrata, C. tropicalis, C. guilliermondii, C. dubliniensis, C. parapsilosis, and C. krusei in local and systemic fungal infections. Some of these species are resistant to antifungal agents. Consequently, rapid and correct identification of species can play an important role in the management of candidiasis. Conventional methods for identification of Candida species are based on morphological and physiological attributes. However, accurate identification of all isolates from clinical samples is often complex and time-consuming. Hence, several manual and automated rapid commercial systems for identifying these organisms have been developed, some of which may have significant sensitivity issues. To overcome these limitations, newer molecular typing techniques have been developed that allow accurate and rapid identification of Candida species. This study reviewed the current state of identification methods for yeasts, particularly Candida species.
ObjectiveThe effect of disinfection by immersion in sodium perborate solution and microwave
irradiation on surface roughness of one denture base resin (Lucitone 550 -L), 3
hard chairside reline resins (Tokuyama Rebase II-TR, New Truliner-NT, Ufi Gel
hard-UH) and 3 resilient reline materials (Trusoft-T; Sofreliner-S, Dentusil-D)
was evaluated. Material and methodsThirty specimens of each material were made and divided into 3 groups: Control -
not disinfected; P - daily disinfection by immersing in sodium perborate solution
(3.8%); MW - microwave disinfection (6 min/650 W). Roughness measurements were
made after polymerization (baseline) and after 1, 3 and 28 days. Roughness
differences relative to the baseline readings were analyzed by Student's t-test
(P=0.05). ResultsAt baseline, Trusoft showed the highest (P<0.001) mean surface roughness (3.54
µm), and its surface roughness was significantly reduced after 28 days of
disinfection by immersion in sodium perborate (P=0.013). Roughness measurements of
material Trusoft were not performed after microwave disinfection due to the severe
alterations on the surface. In the 3 groups evaluated, changes in roughness were
significant for materials Ufi Gel hard (from 0.11 to 0.26 µm; P≤0.041) and New
Truliner (0.19 to 0.76 µm; P≤0.019). The roughness of materials Lucitone 550 (0.37
µm), Tokuyama Rebase II (0.37 µm), Sofreliner (0.49 µm) and Dentusil (0.38 µm)
remained unaffected (P>0.05). ConclusionsThe roughness of the hard reline materials Ufi Gel hard and New Truliner was
adversely affected by microwave disinfection, immersion in water or in sodium
perborate. Microwave disinfection caused severe alterations on the surface of the
resilient liner Trusoft.
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