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Alireza Khakpour,Mostafa Kazemi,Ahmad Tavakkoli,Safar Fazli 대한산업공학회 2018 Industrial Engineeering & Management Systems Vol.17 No.3
Competitiveness is a multi-dimensional concept that organizations must inevitably strengthen themselves in all its dimensions to develop competitive power. Competitiveness is effective on the success of an enterprise in a worldwide level. Accordingly, the purpose of this research was to design a communicational model between the competitiveness types of small and medium industries in Iran. Regarding the research purpose, the study is applied, which is conducted based on the descriptive-causal method. The statistical population of this research in identifying factors affecting competitiveness includes all small and medium enterprises in Qazvin province, Iran. In order to design a model for competitiveness, the experts familiar with the issue of competitiveness were used. Accordingly, two questionnaires were used in this research to collect data. This questionnaire is distributed among members of the statistical sample after the determination of validity and reliability. The exploratory factor analysis, the Interpretative-Structural Modeling (ISM), and Structural-Equation (Path) Model (SEM) have been used to analyze the data. The results findings indicated that among the factors influencing competitiveness, the competitiveness factors related to firm management and the competitiveness factors related to suppliers and resources have the most impact on the competitiveness of small and medium firms. The results (findings) also showed that the competitiveness factors related to demand and customers are recognized as an absolutely influential component. The results of the Structural-Equation (Path) Model (SEM) have evaluated the path coefficients significance. According to the research’s findings, it can be said that the factors affecting the competitiveness related to firm management and competitive factors related to suppliers and resources should be firstly strengthened in order to make small and medium industries more competitiveness and stimulate resources.
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Koodaryan, Roodabeh,Hafezeqoran, Ali,Maleki, Amin Khakpour The Korean Academy of Prosthodonitics 2017 The Journal of Advanced Prosthodontics Vol.9 No.2
PURPOSE. This laboratory study assessed the effect of different dentin cleaning procedures on shear bond strength of resin cements for recementing prosthesis. MATERIALS AND METHODS. A $4{\times}4$ flat surface was prepared on the labial surface of 52 maxillary central incisors. Metal frames ($4{\times}4{\times}1.5mm$) were cast with nickel-chromium alloy. All specimens were randomly divided into 2 groups to be cemented with either Panavia F2.0 (P) or RelyX Ultimate (U) cement. The initial shear bond strength was recorded by Universal Testing Machine at a crosshead speed of 0.5 mm/min. Debonded specimens were randomly allocated into 2 subgroups (n = 13) according to the dentin cleaning procedures for recementation. The residual cement on bonded dentin surfaces was eliminated with either pumice slurry (p) or tungsten carbide bur (c). The restorations were rebonded with the same cement and were subjected to shear test. Data failed the normality test (P < .05), thus were analyzed with Mann Whitney U-test, Wilcoxon signed rank test, and two-way ANOVA after logarithmic transformation (${\alpha}=.05$). RESULTS. The initial shear bond strength of group P was significantly higher than group U (P = .001). Pc and Uc groups presented higher bond strength after recementation compared to the initial bond strength. However, it was significant only in Pc group (P = .034). CONCLUSION. The specimens recemented with Panavia F2.0 provided higher bond strength than RelyX Ultimate cement. Moreover, a tungsten carbide bur was a more efficient method in removing the residual resin cement and increased the bond strength of Panavia F2.0 cement after recementation.
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Roodabeh Koodaryan,Ali Hafezeqoran,Amin Khakpour Maleki 대한치과보철학회 2017 The Journal of Advanced Prosthodontics Vol.9 No.2
PURPOSE. This laboratory study assessed the effect of different dentin cleaning procedures on shear bond strength of resin cements for recementing prosthesis. MATERIALS AND METHODS. A 4 × 4 flat surface was prepared on the labial surface of 52 maxillary central incisors. Metal frames (4 × 4 × 1.5 mm) were cast with nickel-chromium alloy. All specimens were randomly divided into 2 groups to be cemented with either Panavia F2.0 (P) or RelyX Ultimate (U) cement. The initial shear bond strength was recorded by Universal Testing Machine at a crosshead speed of 0.5 mm/min. Debonded specimens were randomly allocated into 2 subgroups (n = 13) according to the dentin cleaning procedures for recementation. The residual cement on bonded dentin surfaces was eliminated with either pumice slurry (p) or tungsten carbide bur (c). The restorations were rebounded with the same cement and were subjected to shear test. Data failed the normality test (P < .05), thus were analyzed with Mann Whitney U-test, Wilcoxon signed rank test, and two-way ANOVA after logarithmic transformation (α = .05). RESULTS. The initial shear bond strength of group P was significantly higher than group U (P = .001). Pc and Uc groups presented higher bond strength after recementation compared to the initial bond strength. However, it was significant only in Pc group (P = .034). CONCLUSION. The specimens recemented with Panavia F2.0 provided higher bond strength than RelyX Ultimate cement. Moreover, a tungsten carbide bur was a more efficient method in removing the residual resin cement and increased the bond strength of Panavia F2.0 cement after recementation.
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