ABSTRACT
In this study, we evaluated the fracture resistance of three commercially available prefabricated primary zirconia crowns and their correlation with dimensional variance. METHODS: a total of 42 zirconia crowns were selected from three companies, (1) NuSmile primary zirconia crowns, (2) Cheng Crowns zirconia, and (3) Sprig EZ crowns. The crowns were divided into two groups based on their location in the oral cavity and further divided into subgroups based on the brand. All of the samples were subjected to fracture tests using a universal testing machine. RESULTS: the mean load observed was highest with Cheng Crowns zirconia anterior crowns (1355 ± 484) and the least load was seen with Sprig EZ anterior crowns with a mean load of 339 ± 94. The mean load observed was highest with Cheng Crowns zirconia posterior crowns (1990 ± 485) followed by NuSmile posterior crowns and the least load was seen with Sprig EZ posterior crowns with a mean load of 661 ± 184. CONCLUSION: the Cheng crowns showed the highest fracture resistance amongst all three groups. Overall, the zirconia crowns (anterior and posterior) tested showed optimum mechanical properties to withstand the masticatory forces.
ABSTRACT
BACKGROUND: The food we consume will have sugar in one or the other form, which is not ideal for our teeth. This can be replaced by the use of sugar substitutes available in the market. Sugar substitutes have beneficial and adverse effects on health. In spite of their beneficial effects, long-term use of sugar substitutes is not recommended because of their health-related complications. Therefore, before consuming any sugar substitutes, everyone needs to know about both health benefits and their health hazards; hence, the present study was designed to assess the awareness, knowledge, and utilization of sugar substitutes among the general population in Riyadh Region, Kingdom of Saudi Arabia. OBJECTIVES: The aim is to assess the awareness and knowledge about sugar substitutes. METHODOLOGY: Questionnaire consisting of demographic details, awareness, and knowledge about sugar substitutes were sent through social media and it was in the Arabic and English Language. After completing the questionnaire, participants are requested to send the link to their friends and relatives. RESULTS: About 60.20% of participants were aware of sugar substitutes. Statistically significant difference was observed for gender and awareness of sugar substitutes (P < 0.05). About 31.5% of the participants are of the view that sugar substitutes have got side effects. About 61.9% of participants are of the view that Sugar substitute reduces the chance of occurrence of dental caries. CONCLUSIONS: Overall, 60.2% of study participants were aware of sugar substitutes, but the controversy on most of the artificial sweeteners cannot be ignored. Hence, the safety of these sweeteners is of prime importance for scientists. Any usage of sugar substitutes should be weighed against the adverse effects.