Acidity can bring about tooth erosion. A laboratory experiment about soft drink acidity to the hardness of tooth surface was done. The purpose of the study was to investigate the surface hardness of the tooth surface after immersion in some kinds of soft drinks. Thirty maxillary premolars were randomly divided into three groups. The first group was immersed in aqua, pH 7.6, the second group in the tea, pH 6,7 and the last group in Cola pH 2,5 for 30, 60 and 120 minutes. The surface hardness measurement was done before and after immersion using micro Vickers hardness tester. The achieved data were analyzed using ANOVA followed by HSD. It was concluded that the immersion in soft drink for 120 minutes could decrease the surface hardness of tooth.
Background: Present research studied the surface hardness and roughness dependence on polymerization. Polymerization of composites occurs through chain reaction that is induced by free radicals. Oxygen in the air decreases the excitability of the photo initiator, causing polymerization interference. Oxygen inhibition layer (OIL) is formed on the surface. OIL can be reduced by curing the composite through by application of glycerin to the surface. Purpose: To determine the effect of glycerin on the surface hardness and roughness of nanofill composite. Material and Methods: 64 specimens of composite (Z350 XT, 3M) were prepared using a disc-shaped acrylic. The groups were divided into group A surface hardness (N=32) and group B surface roughness (N=32). Group A1, the specimen was coated with glycerin and light cured for 20 s and group A2, the specimen was exposed to air and light cured for 20 s. Group B1 was coated with glycerin and light cured for 20 s and Group B2 was exposed to air and light cured for 20 s. The specimens were stored in distilled water for 24 h at 370. Measuring with Vickers and surface roughness tester and. Data were statistically analyzed using Mean-whitney U Test. Results: There were statiscally significant difference between the surface hardness and roughness of nanofill composite coated with glycerin and without glycerin (p<0,05) Conclusion: The surface hardness of nanofill composite resin coated with glycerin is higher than composite without glycerin and the surface roughness of nanofill composite resin coated with glycerin is lower than composite without glycerin
Background. Dental caries is one of the most prevalent chronic disease of people worldwide, and also Indonesia. Based on Indonesian Basic Research from Health Department, prevalence of dental caries in Indonesia was 90.5%. When dental caries rates are reported by gender, female are found to exhibit higher prevalence rates than male. Dental caries is disease of lifetime because it can spread out more throughout life and will continue until the teeth are destroyed without a proper treatment. Purpose. The aim of this study is to analyze the prevalence of posterior teeth caries by the depth of cavity, age, and gender at RSGM FKG UNAIR. Method. Analytic observational study with cross-sectional and stratified random sampling method. Result. Out of 420 patients with teeth caries, 169 male patients (40.2 %) and 251 female patients (59.8 %). The highest prevalence is deep caries (59.76%) and the lowest prevalence is superficial caries (15.95%). Conclusion. It was concluded that there is correlation between the depth of cavity increase by age and female has higher caries prevalence than male but no significance differences between cavity depth and gender.
Background: Nanohybrid Composite is a composite that is often used in dentistry because it has advantages in physical, mechanical and esthetic properties. One of the mechanical properties which can be an indicator of the resilience of restorative material is surface roughness. One of the factors that affect the surface roughness is acidic drink consumption habits. Fruit that easily processed into fresh juice and widely consumed as beverage is lime. Lime has a sour taste because it has main content of citric acid. Purpose: The aim of this study was to determine the effect of prolonged lime juice consumption to the roughness of nanohybrid composite surface. Methods: 24 composite nanohybrid samples sized 5x2 mm divided into 4 groups. The control group was immersed in sterile water, the treatment group was immersed in lime juice for 2.5 hours, 15 hours and 30 hours. Before and after immersion, all samples were tested using a Surface Roughness Tester. Data were tested statistically. Results: Kruskal Wallis Test and Tukey HSD showed significant changes in surface roughness after being immersed in lime juice. Group of 30 hours immersion obtained the greatest increase in surface roughness. Conclusion: The 30 hours immersed composite group has rougher surface than 15 hours. The 15 hours immersed composite group has rougher surface than 2,5 hours
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