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    In-vivo Biocompatibility Evaluation of Different Self-Adhering Composite Resins on Wister Rats
    (Technical Assoc Photopolymers,Japan, 2021) Saygin, Aysegul; Unal, Murat; Koc, Tulay; Ipek, Irem; Candan, Merve
    This study aimed to compare the biocompatibility of two different self-adhering flowable resin composites (SAFCs). 54 polyethylene tubes filled with two different SAFCs [Group V: Vertise Flow (VF), Group F: Fusio Liquid Dentin (FLD), or Group C: empty (Control)] were implanted into the subcutaneous tissue of 18 rats. After 7, 30, and 90 days of implantation, the rats were euthanatized (n=6). The implanted materials were removed with the surrounding tissue for histologic evaluation. The subjects were evaluated in terms of inflammation, fibrous capsule thickness, necrosis, macrophage, and giant cell presence. When the SAFC groups and Group C were compared on days 7, 30, and 90, inflammation, fibrous capsule thickness, and macrophage on the 7th day were statistically significant (p<0.05). Statistically, the giant cell and macrophage criteria were statistically significant on the 7th, 30th, and 90th days in all groups (p<0.05). When the groups were evaluated on different days among themselves, significant differences were observed in terms of local tissue response (p<0.05), while necrosis was found to be statistically insignificant (p>0.05). Biocompatibility was found similar for the SAFCs. These materials used in the study have shown good biocompatibility in rats, and SAFCs can be considered suitable for all restorative treatments.
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    Investigation of colour and surface changes of ceramic CAD/CAM blocks with different surface treatments after immersion to different beverages
    (Springer, 2022) Avsar, Melek Kilic; Bolayir, Giray; Saygin, Aysegul; Ulucan, Mehmet Cagatay
    This study aims to investigate the colour and surface changes of CAD-CAM porcelain blocks with different surface finishing treatments after being deposited into beverages. A total of 128 disc-shaped samples obtained from different CAD/CAM materials [Monolithic Zirconia (Z), Vita Suprinity (VS) and Vita Enamic (VE)] and feldspathic porcelain (FP) as the control group were divided into two subgroups [manual polish (M), glaze (G)] according to their surface finishing treatments. Measurements of the samples kept in different liquids (coffee and wine) after initial surface roughness and colour measurements (Delta E) were repeated on the 14th day. It was measured using a spectrophotometer for colour value measurement and an optical profilometer for surface roughness values, and SEM images were taken. When the initial and 14th-day surface roughness measurements were compared, significant differences were found in all groups (p < 0.05). The lowest roughness value (0.10 +/- 0.001) was obtained in the VS-M group aged into wine, while the highest roughness value (0.33 +/- 0.001) was obtained in the VE-M group aged into wine. Comparing the averages of colour changes (Delta E), the highest Delta E average was found in the FP-M group deposited into coffee (3.70 +/- 0.50), while the lowest Delta E value was found in the VE-M group deposited into wine (0.50 +/- 0.13). Depending on the structural characteristics of porcelain groups in terms of surface roughness and colour, we can say that the surface finishing treatment and beverage types have different effects.