Background:  Beverage consumption is considered as one of the important risk factors for dental erosion.The purpose of the present study is to evaluate the enamel dissolution potentials of commercially available beverages through pH analysis and quantification of calcium ions released. Materials and Methods:- Four commercially available beverages, Green tea (TETLEY LTD), Red bull energy drink (RAUCH FRUCHTSAFTE, GMBH&CO OG, UAE), Real mixed fruit juice (real fruit power ltd, DABUR), Appy fizz (PARLE AGRO) were used to analyse pH and calcium ions released through two independent phases. 24 enamel specimens were prepared from 12 healthy human molars. pH analysis was done with pH meter and calcium analysis was measured by using colorimetry and spectrophotometry. Statistical analysis was carried out by using tests of descriptive statistics, paired t test for intra group comparisons and One way ANOVA with Post Hoc tukey test for intergroup comparisons. Results: Mixed fruit juice had shown highest acidic potential while Green tea had shown lowest acidic potential.                Red Bull had shown highest dissolution potential while green tea had shown lowest dissolution potential. Conclusion: Dental erosion is influenced by the pH of the beverages and calcium dissolution of the tooth. Red bull has shown highest erosion potential. Even though green tea with an high acidic pH did not show any considerable erosion potential.. Key words: Dental erosion, pH of beverages, dissolution potential of beverages

Background: Instruments used in the operative area are colonised by various microbial organisms during usage. Sterilization is an important prerequisite to avoid cross contamination. Purpose of the study: The purpose of this study was to evaluate whether presterilization has any influence on conservative and endodontic material sterility, immediately after unpacking and post exposure to clinical environment for 15 days. Methods: Gutta percha cones, Rubber dam clamps, Impression trays, Dental burs (#245 bur, Access opening bur) were tested.Materials were randomly sampled at 2 time points (t0, at package opening; t1, at 15days) during their clinical usage. Vortexing, centrifuging, streak and inoculation was done. Colony formation under aerobic conditions was observed on media before and after presterilization. Statistical analysis: Wilcoxon matched pairs test was done for comparison of data before and after pre sterilization with status of aerobic organisms at to (immediately after opening) and t1 (during clinical usage). Conclusion: Presterilization effectively eliminates cross contamination of various aerobic microorganisms in conservative and endodontic material immediately unpacked and post exposure to clinical environment for 15 days.