Back ground: Reduction of a durable bond to acrylic denture base is the main problem associated with soft liner materials. Purpose: Evaluation of the influence of addition of Ag-Zn Zeolite on shear bond strength of silicon cold cure soft liner. Approach: thirty specimens of silicon cold cure soft liner were constructed for shear bond- strength test and divided into three groups: Control groups: 10 specimens without incorporation of Ag-Zn Zeolite, Experimental group: 10 specimens with 0.5% by weight of Ag-Zn Zeolite Experimental Group: 10 specimens with 0.75 %by weight of Ag-Zn Zeolite Plastic pattern of acrylic block with dimensions (75 mm length x 25mm width x 5mm depth )was fabricated and evaluated by Instron testing machine. Results: Least significant difference of (0.75%) of Ag-Zn zeolite group was significantly different compared with the experimental group of (0.5% and control group) at p<0.05. Conclusion: The incorporation of 0.5%, 0.75% by weight into silicon cold cure soft liner had significant effect and causes improvement in shear bond strength.
Background: In chemistry the development of polymer has produced another material to poly methyl methacrylate such as epoxy resins, polyamides (nylon), acetyl resins -----etc. All these resins are suited for thermoplastic processing. Polyamide materials are more flexible than the commonly used polymethylmethacrylate. The flexibility of polyamide allows partial dentures to be pressed in one piece including clasps. Glass fibers are the most widely used reinforcing materials forming about 90 % of the reinforcement in resins. The addition of fibers to provisional restorative resin increases tensile strength, fracture toughness and surface hardness. Objective of the study: An evaluation of the surface roughness, modulus of elasticity and tensile strength improvement of flexible denture bases after adding of glass fibers and altering in powder – monomer ratio. Material and Methods: Eighty samples of flexible acrylic were made and divided into two main groups according to the type of test to be used. Forty samples for surface roughness and forty samples for tensile strength and (modulus of elasticity). Each group is divided into four subgroups according to fibers addition and to the alteration in powder-liquid ratio as follows: group (A) consists of (10 specimens) without the addition of glass fibers and with (3:1) powder- monomer ratio. Group (B) consists of (10 specimens) with addition of glass fibers and with (3:1) powder- monomer ratio, group (C) consists of (10 specimens) without addition of glass fibers and with (2.5:1) powder- monomer ratio and group (D) consists of (10 specimens) with glass fibers and with (2.5:1) powder- monomer ratio. The tensile strength and modulus of elasticity were determined by Instron testing machine at cross speed of 0.5mm/min. The T.R 200 device was used to indicate the values of surface roughness specimens before and after finishing and polishing. Results: In the present study, ANOVA test showed a significant difference at (P<0.05) between all the groups of tensile strength test.Least significant difference( LSD) test showed a non-significant difference at (P>0.05) between most of the tested groups except the groups of 3:1 powder–monomer ratio with and without fibers addition and groups of 3:1 ratio without fibers addition in comparison with the groups of 2.5:1 ratio with fibers addition which showed highly significant . The modulus of elasticity revealed a non-significant difference between all the tested groups at (P>0.05). While there were highly significant difference at (p<0.01) between groups of surface roughness test before and after polishing, except the group of 2.5:1 ratio with and without fibers addition which showed a non-significant difference at (P>0.05.). Conclusion: Conclusion was derived that fibers addition significantly affects tensile strength. The modulus of elasticity was not significantly affected by fibers addition or by powder-monomer ratio. Regarding surface roughness, it was improved after fibers addition and alteration in powder-liquid ratio.
Objective: To evaluate and compare the effect of mechanical surface treatment (groove, aluminum oxide particles)with 45 degree bevel type of joint on tensile bond strength of acrylic specimens repaired by two curing methods(microwave and water both).Methodology: Eighty specimens (80) were prepared from pink heat cure acrylic resin. They were divided into twomain groups (40 specimen repaired by microwave energy and 40 specimens repaired by water bath method).Eachgroup can be divided into four subgroups of ten according to the surface treatment. The control group A was leftintact, group B received no surface treatment, group C and D received surface treatment by (groove, 50 m aluminumoxide particles). Specimens were tasted by using an instron universal testing machine until fracture occurs.Result: The results indicate that nurses have adequate knowledge toward general information on infection, infectioncontrol strategy, causes, prevention, sterilization and disinfection, and healthy conditions in operating roomenvironment. Regarding practices, the results indicated inadequate practices concerning the standard precautionduring wearing operation clothing, patient's preparation, and hand washing practices. While, their practicesconcerning tools and equipment preparations were adequate. There is a significant relationship between nurses’knowledge and practices and their educational level and years of experience.Recommendation: It can be concluded that mechanical surface treatment prior to denture base repair resulted in asignificant improvement the tensile bond strength of denture base resin.
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