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@#Introduction: Discolouration of microhybrid composite resin is a common problem faced by both dental practitioners and patients. The accumulation of plaque, penetration of colourant particles from foods and beverages, dietary habits and the smoothness of restorations have been known to influence the quality of the aesthetic restoration. The purpose of this study was to determine the effects of polishing systems on surface roughness that led to discolouration of the microhybrid composite resin. Methods: Forty five samples of microhybrid composite resin (Filtex Z100) restorations were polished with two different polishing systems; one-step polishing (OP) system on the distal surface and multiple-step polishing (MP) system on the mesial surface. All samples were then immersed in two common beverages: black coffee and cocoa, for 20 minutes daily throughout 28 days of the experimental period. Results: Data on visual colour measurement and spectrometer colour spectrum was subjected to one-way ANOVA test at a significance level of 0.05. Both solutions were found to cause a significant colour change (p=0.0195) on the microhybrid composite resin. Black coffee solution obtained the highest score (71.6) of visual colour change and the lowest reflectance value (62.818) on the distal surface. Surface roughness evaluation using a scanning electron microscope (SEM) had presented that both polishing systems used produced low level of surface roughness. Conclusion: Although MP system produced a smoother surface compared to OP system, a prolonged exposure to colourant particle found to cause an unacceptable discolouration of microhybrid composite resin
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Aim To evaluate the bleaching efficacy of 16% carbamide peroxide, 30%hydrogen peroxide for intracoronal bleaching of root filled discoloured tooth. Methodology Extracted teeth were artificially stained using human blood then centrifuged under 3,200 rpm speed for 30 min thrice daily for a period of 2 days to enhance penetration of the haemolysed red blood cells into the dentinal tubules. The precipitate was removed, and the teeth were immersed in the remaining haemoglobin-rich haemolysate for further 2 days, centrifuging it thrice daily for 30 min. The resultant discoloured teeth were then washed in distilled water. Root canal treatment was performed. After obturation, a 2-mm intermediate base of Intermediate restorative material IRM was placed to 1-mm apical to the cementoenamel junction. Teeth were divided into three groups with 10 teeth per group. Intracoronal bleaching was performed using either 35% carbamide peroxide gel (group CP) in one group, 35% hydrogen peroxide gel (group HP) in another group and distilled water in the control group as the third group. The bleaching agents were replaced after 5 days. The shade of the teeth was evaluated at day 0, 5 and 10 using VITA Zahnfabrik, Bad Sa¨ckingen, Germany) shade guide. The results were analysed using Kruskal–Wallis one-way analysis of variance and Mann–Whitney U-test. Results When superoxol and control group are compared, there shows a clear difference of significance between these two materials. But when superoxol and carbamide peroxide are compared, there is no difference of significance. Both superoxol and carbamide peroxide showed same results. Both are effective bleaching agents. Conclusion In our study we noticed that 16% carbamide peroxide and 30% hydrogen peroxide are equally effective in the treatment of intracoronal bleaching which we observed in a 5,10,15 days of regular intervals.
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Dentinogenesis imperfecta is an autosomal dominant genetic disorder with abnormal dentin structure affecting both primary and permanent dentitions leading to discolouration and attrition of teeth. Diagnosis is usually based on family history, a detailed clinical examination and pedigree construction. Treatment involves preservation of teeth, removal of infection, restoration of function and esthetics.
La dentinogénesis imperfecta es un trastorno genético autosómico dominante, caracterizado por una estructura anormal de la dentina, que afecta tanto la dentición temporal como permanente, generando decoloración y desgaste de los dientes. El diagnóstico generalmente se basa en la historia familiar, el examen clínico detallado y la construcción de pedigrí. Su tratamiento implica la conservación de los dientes, eliminación de infección, y la restauración de la función y la estética.