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Chemical Structure| 13731-98-1 Chemical Structure| 13731-98-1

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Chemical Structure| 13731-98-1

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Joanna Taczała - Warga ;

Abstract: Acrylic dentures are considered resistant to falls and occlusal forces. The problem appears when the denture plate thickness is reduced. This is the case when the patient requires partial prosthetic reconstruction with a skeletal denture in which a single incisal tooth appears. It is assumed that the frame denture should only be replaced after approx. 4 years, while patients report the need for repair after only a few months. The presence of a metal skeleton significantly reduces the space for acrylic. Therefore, there is a need to modify selected acrylic properties and the bond strength between two acrylics. From the analysis of the available literature, it is possible to identify many compounds used to improve prosthetic acrylic strength. However, considering that nowadays, science is striving to use environmentally friendly biomaterials, it is worth focusing on cellulose. The possibility of using cellulose in the micro size allows it to be used as a filler when there is little space for acrylic. However, due to cellulose's structure, using pure cellulose will not lead to the formation of chemical bonds with methacrylic polymers. Therefore, it is necessary to modify the cellulose surface. Another aspect is the problem with the strength of the connection between acrylic plastics. The researchers tried to solve this problem by making retention catches, mechanically expanding the surface, and wiping the tooth surface with selected chemical reagents. Unfortunately, when trying to choose the best method, various measurement methods used in numerous research make it impossible to compare the results objectively. Therefore, there is a need to standardize the research and indicate the methods that significantly impact the connection between acrylics. Based on the collected information, the following objectives of the study were formulated: • Development of a functional material with increased strength by changing the properties of a cellulose-modified methacrylic polymer. • Improving the bond strength between two methacrylic polymers by modifying the surface. Pure cellulose and modified with two silanes (3-methacryloxypropyl) methyldimethoxysilane (MPMS) and octyltriethoxysilane (OTES)) was added to acrylic in the amount of 0.5, 1.0, and 1.5 g. The most significant effect on the improvement of flexural strength was shown by samples with MPMS cellulose in the amount of 0.5 grams. In this case, the increase in strength was almost 6%. Observations of the breakthroughs also revealed that OTES changed the nature of cellulose and facilitated its better dispersion. However, it was MPMS that, despite worse dispersion, made it possible to increase the strength of the material. The modified cellulose and composite samples produced in this way were additionally subjected to detailed analysis. Shifts in characteristic peaks in the FTIR spectra confirmed cellulose modification. The observed shift in the DSC plot may suggest that the addition of modified cellulose acted as a plasticizer for the dental acrylic resin, which resulted in a change in the glass transition temperature value. On the other hand, the inclusion of functional groups from MPMS in PMMA allowed for covalent bonding of the filler and the polymer matrix, which improved the thermal stability of the tested material in TGA tests. The obtained maximum values of stresses and deformations in the simulation of the influence of the curvature of the prosthesis plate and the retention abutment did not differ significantly. In the case of the T-shaped and round hitch, additional stresses appeared on their top, but their values oscillated around 4 MPa. Therefore, it can be considered that the hook does not improve the connection between the materials. The influence of the grooving configuration was analyzed for shape, groove distribution, and force application angle. Two types of grooves were made - parallel and cross. The parameters that obtained the lowest values of stresses and deformations were mapped on actual samples and compared with the cross configuration and the situation where no mechanical modification was applied. The strength of samples with modification increased by almost 57%. In addition, gradual cracking was observed in the case of parallel grooves. The selected grooving parameters were compared with other methods of mechanical surface expanding. The prepared samples were subjected to shear and tensile tests. Additionally, all samples were divided into three groups according to the influence of the oral environment. The noticeably most significant increase in the strength of the connection was achieved by cutting the glaze layer with a carbide milling cutter on both sides. The highest values were obtained with this method in almost all tests. Two-way milling made it possible to increase the bond strength by up to 200% in the case of dry samples. For the research on improving the bond strength, a group of seven reagents was distinguished, consisting of products characterized by functional groups that could react with the polymer and a second group that could act with the surface of the modified cellulose. All reagents were mixed with the composite components, and FTIR spectra were analyzed. The shift of the peaks corresponding to the Si-O bond indicated a favorable modification. Therefore, it was decided to test the selected chemical preparation method on a testing machine. A noticeable increase in the strength of the connection was observed, which was even 272%. The result of this dissertation is a composite consisting of methacrylic polymers and cellulose modified with MPMS, characterized by higher flexural strength compared to a commercial acrylic resin. On the other hand, the mechanical surface modification described in the dissertation by cutting the glaze layer in two directions and combining this method with chemical preparation of the surface with (3-methacryloxypropyl)dimethylethoxysilane allowed for an increase in the bond strength between polymerized acrylic and acrylic composite

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Product Details of [ 13731-98-1 ]

CAS No. :13731-98-1
Formula : C11H22O3Si
M.W : 230.38
SMILES Code : CC(C(OCCC[Si](C)(OCC)C)=O)=C
MDL No. :MFCD00053877
InChI Key :JSOZORWBKQSQCJ-UHFFFAOYSA-N
Pubchem ID :2759528

Safety of [ 13731-98-1 ]

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H302-H315-H319-H332-H335
Precautionary Statements:P261-P280-P305+P351+P338
 

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