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    Influence of Pigments and Pigmenting Methods on Color Stability of Different Silicone Maxillofacial Elastomers After 1-Year Dark Storage
    (Lippincott Williams & Wilkins, 2013) Bankoglu, Merve; Oral, Ihsan; Gul, Esma Basak; Yilmaz, Handan
    Purpose: The purpose of this study was to measure spectrophotometrically the color changes of pigmented maxillofacial silicone elastomers with different pigments and pigmenting methods after storing 1 year in the dark environment. Methods: Three maxillofacial silicones, Cosmesil M511 (CosM511), Cosmesil M522 (CosM522), and Multisil-Epithetic (Mult-Epit), were selected for this study. A total of 240 specimens were fabricated; 80 of each of the 3 elastomers (n = 5) (18 mm in diameter and 2 mm in thickness) were prepared in 6 colorant categories (5 colorant and 1 with no colorant). Specimens were stored in a black box representing a condition of total darkness and placed in a dark environment at ambient room temperature (22 degrees C + 10 degrees C) and humidity (50% +/- 10%) for 1 year. A color spectrophotometer was used to measure the Delta E* values of the test specimens to determine the color changes. Results: The lowest color changes were observed in CosM511 in white color (Delta E* = 1.31) and in Mult-Epit in white color (Delta E* = 1.82) in extrinsic coloration group. The highest color changes were observed in yellow color in CosM511 (Delta E* = 21.61) and CosM522 (Delta E* = 23.78) in silicone pigmented intrinsic coloration method. In coloration methods, intrinsic silicone pigmented groups in all colors except brown in Mult-Epit had the highest Delta E* values. Conclusions: Significant color changes were observed in both pigmented and unpigmented specimens, which were stored in dark environment and not exposed to sunlight.
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    An Overview of Zirconia Dental Implants: Bask Properties and Clinical Application of Three Cases
    (Allen Press Inc, 2014) Gungor, Merve Bankoglu; Aydin, Cemal; Yilmaz, Handan; Gul, Esma Basak
    Due to the possible aesthetic problems of titanium implants, the developments in ceramic implant materials are increasing. Natural tooth colored ceramic implants may be an alternative to overcome aesthetic problems. The purpose of this article is to give information about the basic properties of dental zirconia implants and present 3 cases treated with two-piece zirconia implants. Two-piece zirconia dental implants, 4.0 mm diameter and 11.5 mm in length, were inserted into maxillary incisor region. They were left for 6 months to osseointegrate. Panoramic and periapical radiographs were obtained and examined for bone-implant osseointegration. During the follow-up period the patients were satisfied with their prosthesis and no complication was observed.