PURPOSE: Surface color is one of the main criteria to obtain an ideal esthetic. Many factors such as the type of the material, surface specifications, number of firings, firing temperature and thickness of the porcelain are all important to provide an unchanged surface color in dental ceramics. The aim of this study was to evaluate the color changes in dental ceramics according to the material type and glazing methods, during the multiple firings. MATERIALS AND METHODS: Three different types of dental ceramics (IPS Classical metal ceramic, Empress Esthetic and Empress 2 ceramics) were used in the study. Porcelains were evaluated under five main groups according to glaze and natural glaze methods. Color changes (DeltaE) and changes in color parameters (DeltaL, Deltaa, Deltab) were determined using colorimeter during the control, the first, third, fifth, and seventh firings. The statistical analysis of the results was performed using ANOVA and Tukey test. RESULTS: The color changes which occurred upon material-method-firing interaction were statistically significant (P<.05). DeltaE, DeltaL, Deltaa and Deltab values also demonstrated a negative trend. The MC-G group was less affected in terms of color changes compared to other groups. In all-ceramic specimens, the surface color was significantly affected by multiple firings. CONCLUSION: Firing detrimentally affected the structure of the porcelain surface and hence caused fading of the color and prominence of yellow and red characters. Compressible all-ceramics were remarkably affected by repeated firings due to their crystalline structure.
Ceramics* ; Crystallins ; Dental Porcelain ; Fires*

PURPOSE: The color of the ceramic restorations is affected by various factors such as brand, thickness of the layered the ceramic, condensation techniques, smoothness of surface, number of firings, firing temperature and thickness of dentin. The aim of this study was to evaluate the color change and surface roughness in dental porcelain with different thicknesses during repeated firings. MATERIALS AND METHODS: Disc-shaped (N=21) metal-ceramic samples (IPS Classic; Ivoclar Vivadent; Shaar, Liechtenstein) with different thickness were exposed to repeated firings. Color measurement of the samples was made using a colorimeter and profilometer was used to determine surface roughness. ANOVA and Tukey tests with repeated measurements were used for statistical analysis. RESULTS: The total thickness of the ceramics which is less than 2 mm significantly have detrimental effect on the surface properties and color of porcelains during firings (P<.05). CONCLUSION: Repeated firings have effects on the color change and surface roughness of the dental ceramics and should be avoided.
Ceramics* ; Dental Porcelain ; Dentin ; Fires* ; Surface Properties

Background and Objectives: Balance control is maintained in stationary and dynamic conditions, with coordinated muscle responses generated by somatosensory, vestibular, and visual inputs. This study aimed to investigate how the vestibular system is affected in the presence of an optical illusion to better understand the interconnected pathways of the visual and vestibular systems. Subjects and Methods: The study involved 54 young adults (27 males and 27 females) aged 18-25 years. The recruited participants were subjected to the cervical vestibular evoked myogenic potentials (cVEMP) test and video head impulse test (vHIT). The cVEMP and vHIT tests were performed once each in the absence and presence of an optical illusion. In addition, after each test, whether the individuals felt balanced was determined using a questionnaire. Results: cVEMP results in the presence of the optical illusion showed shortened latencies and increased amplitudes for the left side in comparison to the results in the absence of the optical illusion (p≤0.05). When vHIT results were compared, it was seen that the right lateral and bilateral anterior canal gains were increased, almost to 1.0 (p<0.05). Conclusions It is thought that when the visual-vestibular inputs are incompatible with each other, the sensory reweighting mechanism is activated, and this mechanism strengthens the more reliable (vestibular) inputs, while suppressing the less reliable (visual) inputs. As long as the incompatible condition persists, the sensory reweighting mechanism will continue to operate, thanks to the feedback loop from the efferent vestibular system.

Primary neuroendocrine carcinoma of the breast is an extremely rare neoplasm that differs from other types of breast carcinoma according to the pathological features. We describe here a case of primary neuroendocrine carcinoma in a 72-year-old woman who complainted of a lump in her left breast. After examination and evaluation, the diagnosis was made by a core needle biopsy and the subsequent immunohistochemical examination of the specimen revealed more detailed information. We performed modified radical mastectomy, which showed no axillary node involvement. The patient was given neither radiation nor chemotherapy, however, but hormonotherapy was started postoperatively. Any recurrence has not been demonstrated at 12 months after the operation.
Aged ; Biopsy, Large-Core Needle ; Breast ; Breast Neoplasms ; Carcinoma, Neuroendocrine ; Female ; Humans ; Mastectomy, Modified Radical ; Recurrence

Primary neuroendocrine carcinoma of the breast is an extremely rare neoplasm that differs from other types of breast carcinoma according to the pathological features. We describe here a case of primary neuroendocrine carcinoma in a 72-year-old woman who complainted of a lump in her left breast. After examination and evaluation, the diagnosis was made by a core needle biopsy and the subsequent immunohistochemical examination of the specimen revealed more detailed information. We performed modified radical mastectomy, which showed no axillary node involvement. The patient was given neither radiation nor chemotherapy, however, but hormonotherapy was started postoperatively. Any recurrence has not been demonstrated at 12 months after the operation.
Aged ; Biopsy, Large-Core Needle ; Breast ; Breast Neoplasms ; Carcinoma, Neuroendocrine ; Female ; Humans ; Mastectomy, Modified Radical ; Recurrence