ABSTRACT
PURPOSE: The purposes of this study were to evaluate the staining resistance of CAD/CAM resin-ceramics polished with different techniques and to determine the effectiveness of the polishing techniques on resin-ceramics, comparing it with that of a glazed glass-ceramic. MATERIALS AND METHODS: Four different CAD/CAM ceramics (feldspathic ceramic: C-CEREC Blocs, (SIRONA) and three resin-ceramics: L-Lava Ultimate, (3M ESPE), E-Enamic, (VITA) and CS-CeraSmart, (GC)) and one light cure composite resin: ME-Clearfil Majesty Esthetic (Kuraray) were used. Only C samples were glazed (gl). Other restorations were divided into four groups according to the polishing technique: nonpolished control group (c), a group polished with light cure liquid polish (Biscover LV BISCO) (bb), a group polished with ceramic polishing kit (Diapol, EVE) (cd), and a group polished with composite polishing kit (Clearfil Twist Dia, Kuraray) (kc). Glazed C samples and the polished samples were further divided into four subgroups and immersed into different solutions: distilled water, tea, coffee, and fermented black carrot juice. Eight samples (8 × 8 × 1 mm) were prepared for each subgroup. According to CIELab system, four color measurements were made: before immersion, immersion after 1 day, after 1 week, and after 1 month. Data were analyzed with repeated measures of ANOVA (α=.05). RESULTS: The highest staining resistance was found in gl samples. There was no difference among gl, kc and cd (P>.05). Staining resistance of gl was significantly higher than that of bb (P<.05). Staining resistances of E and CS were significantly higher than those of L and ME (P<.05). CONCLUSION: Ceramic and composite polishing kits can be used for resin ceramics as a counterpart of glazing procedure used for full ceramic materials. Liquid polish has limited indications for resin ceramics.
Subject(s)
Ceramics , Coffee , Daucus carota , Immersion , Tea , WaterABSTRACT
Background: In literature, electrocardiographic (ECG) changes and the increase in the levels of the natriuretic peptide are shown to occur in patients having acute ischemic stroke. We aimed to investigate the association between ECG alterations and NT pro B-type natriuretic peptide (NT-proBNP) values in patients having acute ischemic stroke with no known cardiac pathology. Methods: The patients who admitted to the emergency service with acute ischemic stroke were enrolled in the study. Their ECGs were recorded and serum samples were obtained as soon as they arrived into the emergency service. The plasma NT-proBNP levels were measured by electrochemiluminescence method. Maximum QT interval, QT dispersion (QTd), corrected QT and corrected QTd (cQT and cQTd) was calculated, for each ECG. The patients were evaluated according to the Glasgow Coma Scale (GCS) and National Institutes of Health Stroke Scale (NIHSS). Results: A total of 50 consecutive patients were evaluated. QT intervals for 4 patients (8%) and cQT intervals for 29 patients (58%) were above 440 ms and 11 patients (22%) had QTd values above 50ms and 17 (34%) had cQTd values above 50 ms. The NTproBNP levels had a negative correlation with the GCS (p=0.001, r= -0.461) and a positive correlation with the NIHSS, cQT, QTd and cQTd (p=0.001, r=0.444, p=0.000, r=0.494, p=0.016, r=0.338 p=0.011, r=0.355, respectively). Conclusions: The NT-proBNP levels in the ischemic stroke patients with no known cardiac pathology were markedly increased, and this increase was found to be associated with the GCS, NIHSS, cQT, QTd and the cQTd interval.