Aim: The aim of this study is to evaluate the surface roughness and color stability of a nanohybrid composite resin after exposure to tea, coffee, Coca-cola, and artificial saliva on the 7 th , 14 th , and 28 th day. Materials and Methods: Forty specimens of nanohybrid composite resin discs of dimension 6 mm × 2 mm were fabricated and were randomly divided into four equal groups based on beverages (Group 1: control group – artificial saliva, Group 2: Tea, Group 3: Coffee, and Group 4 : Coca-cola). Baseline readings of surface roughness (Ra) and color change (ΔE) were obtained by profilometer and digital image analysis technique in CIE l*a*b scale followed by the readings (ΔE) taken on the 7 th , 14 th , and 28 th day of exposure to respective beverages. Statistical Analyses: One-way analysis of variance (ANOVA) followed by post hoc Tukey's test and paired t -test along with Pearson's correlation with a P = 0.05. Results: Overall, highest surface roughness was obtained in the samples exposed to Coca-cola followed by coffee and tea while the least surface roughness was obtained in the samples exposed to artificial saliva (control group) which was statistically significant ( P < 0.05). Overall highest color change was obtained in tea followed by coffee and Coca-cola. The least color change was observed in the samples exposed to artificial saliva (control group) ( P < 0.05). Conclusion: Surface roughness and color change were time dependent as both increased with time. Furthermore, greater the surface roughness, more was the color change observed in all the groups at all tested time intervals.

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To evaluate the hardness of four restorative materials, nanohybrid composite resin, Cention N, silver amalgam and type II GIC Materials and method: With the help of a 5mm diameter straw, already cut to 3 mm in length, cylindrical plastic moulds were prepared. Restorative materials were inserted in different moulds Composite resin and cention N were polymerized with LED. Moulds filled with materials were covered with a glass slab to provide a flat surface. All the samples were stored in distilled water for 24 hrs. The samples so prepared were divided into groups as follows and subjected to experimentation. The samples were randomly tested with microardness indentor. Result: Among all the restorative materials, Cention N showed highest microhardness value followed by silver amalgam, nanohybrid composite resin and type II glass ionomer cement Conclusion: According to our results, the microhardness of restorative materials could withstand the masticatory forces in the clinical context. Cention N showed better microhardness properties becoming a more clinically suitable option for minimal invasive treatments.

Aim: The aim of this study is to evaluate the enamel surface abrasion using four different dentifrices and a customized automated brushing machine under a profilometer. Materials and Methods: A total of 30 enamel blocks (9 mm × 9 mm × 2 mm) were prepared from freshly extracted maxillary central incisors which were randomly divided into five equal groups (Group 1: specimens brushed with Colgate Total, Group 2: specimens brushed with Colgate Lemon and Salt, Group 3: specimens brushed with Colgate Visible White, Group 4: specimens brushed with Colgate Sensitive, and Group 5: intact enamel surface). Samples were brushed using a customized automated toothbrushing machine for 60 min. A profilometric read out (Ra value) was taken for each group subjected to brushing and also for the control group. Statistical Analysis: Statistical analysis used in this study was one-way analysis of variance followed by post hoc Tukey's test. Results: Statistically significant differences ( P < 0.05) were observed in the values of enamel abrasion (Ra) among Group 1–Group 4 whereas Group 5 (control group) had no significant difference in enamel abrasion ( P > 0.05). Conclusion: The highest enamel abrasion was observed in the group with Colgate Visible White toothpaste, and the least enamel abrasion was seen in the group with Colgate Sensitive Plus.

Coronavirus disease 2019 (COVID-19) has been a major health concern globally ever since it was declared as Pandemic by the World Health Organization in March 2020. Due to the evolving and contagious nature of coronavirus, it continues to remain a threat for dental health-care personnel. As the virus travels from person-to-person via direct contact through droplet inhalation, cough, and sneeze or through contact transmission, it remains infectious even through inanimate surfaces. A seemingly healthy asymptomatic person may have the potential to trigger the spread of this disease. Coronavirus has the capability of spreading through community transmission. There is no specific treatment or vaccine as of now for stopping the spread of COVID-19, hence universal precautions and awareness with mass involvement is required to ward off this pandemic. Dental health-care personnel are at immense risk due to the near proximity with patients and continual exposure to saliva, blood, and other body fluids. Management protocol regarding awareness and preventive measures should be laid down for dental clinic/hospital to contain the outspread of this infectious disease.