Aim To investigate the colour stability of Crystalized Acetyl Resin, in comparison to three other aesthetic restorative materials, when immersed in different staining aqueous solutions. Materials and methods Fifteen disc-shaped specimens each, of the four materials tested, were immersed in either DW or 4 staining solutions. CIE L*a*b* values were recorded using a digital spectrophotometer on a weekly basis for 4 weeks. Data were compared using three- way/two-way ANOVA along with auto-regressive model. Results Two-way Anova indicates that there is a significant colour change in all materials over time when immersed in the different staining solutions. Auto-regressive model showed that the colour change in each successive week was statistically significant (P < 0.001). Conclusion The most staining solution affecting the materials during this study was black coffee. Within the limitation of this study, Acetyl Resin was the most colour stable material among the other materials.

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Background: Health-care organizations all throughout the world are concerned about quality. Patients' satisfaction has been studied at a number of dental clinics throughout the globe. Patient satisfaction is an important factor in assessing the relationship between the quality of health-care services delivered and the patients' confidence. During the COVID-19 epidemic, the study's goal was to find out how satisfied patients were with the quality of dental treatment, as well as the preventative measures and precautions offered at Riyadh Elm University's dentistry clinics. Materials and Methods: During the COVID-19 epidemic, a pre-validated questionnaire was issued to patients visiting Riyadh Elm University clinics. The research took place from March to September 2020. The questionnaire included questions about consultation provision, gratification with the receptionist's performance, satisfaction with your treating healthcare professional, treatment expenses, satisfaction with the level of housekeeping prevention strategies and preemptive provided, and eventually an overall assessment of the clinic's services. Results: During the COVID-19 pandemic, 1313 questions were gathered from the Riyadh Elm University dentistry clinic's electronic system. During the pandemic COVID-19, (92%) of the participants agreed that getting an appointment at the dental clinics was straightforward, (88.9%) were satisfied with treatments received at Riyadh Elm University's Dental Clinic during the COVID-19 epidemic, and (66 percent) with treatment costs. During the pandemic COVID-19, the vast majority of participants (91 percent) were satisfied with their treatment provider, and the vast majority of participants were satisfied with the services offered by Riyadh Elm University's dentistry clinic. Conclusions: Riyadh Elm University's dentistry clinics were successful in achieving participant satisfaction with services, staff, treatment, and fees during the COVID-19 outbreak.