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Composite translucency varies by manufacturer. This information should be considered when selecting materials and clinical techniques to improve clinical performance. SUMMARYThe purpose of this study was 1) to compare the translucency of seven different types of composite materials and three different shade categories (dentin, enamel, and translucent) by determining the translucency parameter (TP) and light transmittance (%T) and 2) to evaluate the correlation between the results of the two evaluation methods. ) from different manufacturers were screened in this study. Ten disk-shaped specimens (10 mm in diameter and 1 mm in thickness) were prepared for each material. For the TP measurements, the colors of each specimen were recorded according to the CIELAB color scale against white and black backgrounds with a colorimeter and used to calculate the TP value. For the %T measurements, the mean direct transmittance through the specimen in the range between 380 and 780 nm was recorded using a spectrometer and computer software. Two-way analysis of variance (ANOVA) tests were performed to compare the TP and %T for the composite materials and shade categories. One-way ANOVA and Tukey tests were used for the seven composite materials per shade category and the three shade categories per composite material. The correlation between the two evaluation methods was determined using the Pearson correlation coefficient. All statistical procedures were performed within a 95% confidence level. TP differed significantly by composite material within each shade category (p,0.05) and by shade category within each composite material (p,0.05). %T differed significantly by composite material within each shade category (p,0.05) and by shade categories within each composite material (p,0.05), except for BF and ES. For the two evaluation methods, TP and %T, were positively correlated (r=0.626, p,0.05). These methods showed strong correlation for each composite

Within the limitations of this study, the RBCs became darker and yellowish as the shade number increased. The blue light irradiance decreased in increasing order of the shade numbers. Changes in the translucency demonstrated different trends among the shades, depending on the product line.

Clinical RelevanceThe use of RMGICs and flowable composites as base materials with the appropriate elastic modulus can reduce a marginal defect in an overlying composite restoration. 442Operative Dentistry were submitted to 600,000 load cycles at 49N with a frequency of 2Hz. The IM% in the postload specimens was calculated. Repeated measured one-way ANOVA with Tukey was applied to compare the IM% in the six groups at the 95% confidence level. The results of statistical analysis indicated that the IM% was Group 3, 4, 6 ≤ 2 ≤ 5 ≤ 1.

Within the limitations of this study, it is considered that the PBFV increases with an increase in systolic BP. Age, sex, and tooth type had no significant effect on the PBFV of maxillary anterior teeth.

Multi-layered material (sandwich panel) consists of double-sided steel plate which is incombustible material or similar material and core material which is not incombustible material. In case of sandwich panel which uses combustible material as insulation, flames spread inside the steel plate at the time of fire so that it is difficult to extinguish fire from the outside and flames spread rapidly and may cause the building to collapse. The current Building Act requires the sandwich panel to secure fire-retardant performance according to the purpose and size of building. In this study, the fire spreading prevention structure applied to partial exterior walls was applied to multi-layered material and its effect was measured through full scale fire test and the possibility to secure fire safety of buildings by applying the fire spreading prevention structure to multi-layered material in future was presented.

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