Mohamed Blom (branchmodem54)

To evaluate some biological (Candida albicans biofilm formation and cytotoxicity) and mechanical (roughness and hardness) properties of a hard reline acrylic resin after immersion in liquid disinfectant soaps. Reline samples were made (14 mm in diameter and 1.2 mm in thickness) and immersed in different disinfectant solutions DW distilled water at 37°C (control group); DS Dettol liquid soap; and LS Lifebuoy liquid soap. After immersion in the different groups, the properties of C. albicans biofilm formation, cytotoxicity, hardness, and roughness were evaluated. Each sample was immersed in the disinfectant solutions for 8 hours for microbiological testing and for 0, 7, 14, 21, and 28 days, with daily immersion cycles, for cytotoxicity and mechanical testing. Data were tabulated and analyzed by Shapiro-Wilk and Levene statistical tests. Based on these results, the appropriate tests for finding statistically significant differences were applied (α= 0.05). There was a reduction of roughness after immersion at, in general, immersion in liquid disinfectant soaps had no adverse effect on the physical properties of the hard reline acrylic resin evaluated. In addition, Lifebuoy liquid soap reduced the biofilm formed on the samples and the solutions did not affect the cytotoxicity of the material. Disinfectant liquid soaps could be an alternative method for disinfection of relined dentures. To evaluate the clinical performance of Class II restorations made with bulk-fill or layering pure ormocer materials, as well as the time necessary to fill the preparations. After ethics approval, a randomized controlled split-mouth clinical trial was performed. 30 subjects were selected according to the inclusion/exclusion criteria, and two restorations were randomly performed in each first or second molar that presented caries, fracture, or cosmetic needs. One restoration was done with the bulk-fill material Admira Fusion x-tra, applied with increments up to 4 mm (intervention group), while the second was performed with the regular Admira Fusion, applied by a 2 mm layering technique (control group). The universal adhesive system Futurabond U was used for both groups. The subjects and examiners were blinded, and the examiners were previously calibrated. The restorations were evaluated according to FDI criteria, after 7 days, 6, 12 and 24 months, and the outcome was success rate based on esthetic, functio bulk material (P= 0.0454). After 24 months of intraoral service, the restorations made with both materials presented similar and excellent clinical performance for all parameters analyzed. The bulk-fill material required significantly less chair time to apply than the layering one, simplifying and accelerating the restorative technique. The bulk-fill ormocer-based composite was an appropriate alternative to the conventional layering material, since similar clinical performance was observed after 2 years, with the advantage of shorter chair time, due to simplified operative procedures. The bulk-fill ormocer-based composite was an appropriate alternative to the conventional layering material, since similar clinical performance was observed after 2 years, with the advantage of shorter chair time, due to simplified operative procedures. To evaluate the cleaning of dental handpieces and its associated parameters, internal, external cleaning and drying, and rotation, for two washer-disinfectors Teon+ by W&H, and a dental rack for WD290 by Belimed. An original method was developed with resin flags on dental burs to assess the inner rotation during the cleaning cycle. Concerning the cleaning and drying evaluation, three groups (9, 24 and 22 handpieces) were used in different conditions soiled with Soil Test, soiled with heparinized blood, used in real conditions after a dental procedure, and clean (as control). Cycles were performed with the two washer-disinfectors, followed