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The effect of glazing and aging on the surface properties of CAD/CAM resin blocks
Tekce, Neslihan,Fidan, Sinan,Tuncer, Safa,Kara, Dilan,Demirci, Mustafa The Korean Academy of Prosthodonitics 2018 The Journal of Advanced Prosthodontics Vol.10 No.1
PURPOSE. To investigate the effect of accelerated aging on surface properties of glazed CAD/CAM resin blocks using a 2D surface profilometer and a 3D non-contact optical profilometer. MATERIALS AND METHODS. Three types of CAD/CAM resin restorative materials, LAVA Ultimate (3M ESPE, St Paul, MN, USA), VITA Enamic (Vita Zahnfabrik H. Rauter, Bad $S\ddot{a}ckingen$, Germany), and Cerasmart (GC Corparation, Tokyo, Japan) were used for this study. CAD/CAM blocks were cut in 3-mm thickness slabs and divided into three groups; Group 1: control group (specimens polished with 600 grit SCI paper); Group 2: specimens sandblasted, silanized, and glazed with Optiglaze Color (GC); Group 3: glazed specimens subjected to 5000 thermocycles (n=15). The surface roughness ($R_a$ and $R_z$) was evaluated using a profilometer and a 3D scanning instrument. Data were analyzed using two-way ANOVA and Tukey's post- hoc test (P<.05). RESULTS. LAVA, VITA, and Cerasmart exhibited statistically similar $R_a$ and $R_z$ values for each group (P>.05). For VITA and Cerasmart, the specimens in Group 1 exhibited significantly higher $R_a$ values than Group 2 (P<.05). Group 1 ($0.502R_a$), Group 2 ($0.384R_a$), and Group 3 ($0.431R_a$) exhibited statistically similar $R_a$ values for LAVA (P=.062). After 5000 thermocycles, surface roughness values did not change significantly for glazed LAVA, VITA, and Cerasmart (P>.05). CONCLUSION. Glaze material Optiglaze Color makes CAD/CAM resin surfaces smooth and glazed CAD/CAM surfaces seem resistant to deterioration under 5000 thermocycles.
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The statistical optimization of bacterial cellulose production via semi-continuous operation mode
Ali O¨ zhan Aytekin,Deniz Dilan Demirbag,Tug˘c¸e Bayrakdar 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
Bacterial cellulose (BC) is highly pure and has a higher crystallinity and molecular weight than plantcellulose. Therefore, BC can be used in many different areas such as biotechnology, pharmaceutical,cosmetics. Because of the price of BC, the productivity of BC is an important parameter for industrial scaleapplications. In this study, BC was produced in static culture using a semi-continuous operation mode;the conditions were optimized using response surface methodology (RSM). The collected BC wascharacterized by Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM),and tensile strength. Optimization parameters were selected as glucose concentration, surface area/volume ratio, surface area and incubation day intervals. The optimum values for incubation dayintervals, volume changing ratios, glucose concentrations and surface area/volume ratios were 7 days,66%, 50 g/L and 1.22 cm 1, respectively. BC productivity reached 0.284 g/L/day under optimalconditions, while the model equation proposed 0.289 g/L/day. RSM is essential for determining theoptimum values of parameters for BC production compared with the one-variable-at-a-time method. The semi-continuous operation mode is alternative and a good candidate for the industrial scaleproduction of BC.
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