RESUMO
Aims: The aim was to evaluate the effect of different surface treatments on the repair shear bond strength of aged resin composites. Materials and Methods: Forty cylindrical-shaped specimens were treated from each material: Tetric Evo Ceram, Neo Spectra, and Filtek Ultimate Universal Restorative and allocated into four groups according to the surface treatment planned to use: Group 1: diamond, Group 2: silica coating, Group 3: carbide burs, and Group 4: control group. Following the surface treatment, composites were repaired with flowable resins. The shear bond strength was tested using a universal testing machine at a crosshead speed of 0.5 mm/min. The fracture mode was assessed under 50× magnification. The data were analyzed statistically using a two-way analysis of variance (ANOVA) test followed by a one-way ANOVA test. Multiple comparison procedures were performed using Tukey's test. The level of significance was set at P < 0.05. Results: The lowest mean value of the shear bond strength was for the Filtek Ultimate Universal Restorative in the control group, whereas the highest mean value was in the silica group. Silica and carbide groups had significantly higher mean values of the shear bond strength than diamond and control groups in Tetric EvoCeram and Filtek Ultimate Universal Restorative. In contrast, in Neo Spectra St HV, the carbide group had a higher mean value but was not statistically significant. Conclusion: Combinations of mechanical and chemical retentive systems enhance the shear bond strength of the repair composite to the aged composite. Among the different surface treatments employed in this study, silica and carbide groups show higher repair bond strength of new composite to aged composite.
RESUMO
AIMS AND OBJECTIVES: To evaluate the level of parents' satisfaction with pediatric dental care provided by dental students at the College of Dentistry and explore the factors associated with various parents' demographics. MATERIALS AND METHODS: A cross-sectional study was conducted among parents (n = 150) whose children received dental care in dental colleges in King Saud University (KSU) in Riyadh. The parents were asked to fill a self-administered dental satisfaction questionnaire between Februry and April 2016. Data were recorded and analyses using the Statistical Package for the Social Sciences Version 20 (SPSS Inc., Chicago, IL, USA). RESULTS: Results indicated that only 10.7% of the parents strongly agreed that before being seen they had to wait for a long time in the waiting area, and 36% strongly agreed that one of the causes for which they went to the KSU dental college is that there were inadequate pedodontics in their region. More than half of parents (60%) strongly agreed that the KSU dental clinic is up to date and very modern. CONCLUSIONS: The results indicate that the pediatric department has been successful in achieving parents' satisfaction with dental students, their treatment, as well as operational aspects related to access. There was a strong degree of satisfaction from parents regarding the KSU dental college being modern and up to date.