The scratch hardness method allows for a more explicit ranking of orthodontic polymeric materials when measurements are made with a profilometer. PCA showed that Shore hardness explains 45% of the total variance in all the results across the materials. The results of scratch hardness measurements using a contact profilometer correlated with the Shore hardness to a greater extent than measurements made using an optical microscope. Statistical PCA and correlation analyses were performed. A sliding wear test was performed using the ball-on-disc method. Shore hardness tests and a scratch test with a Rockwell indenter were performed.
The purpose of the work was an experimental comparative assessment of indentation hardness and scratch hardness and the sliding wear of four selected polymeric materials used in the manufacture of orthodontic appliances.įour commercial materials were compared. The scientific goal resulted from the problem of using different methods of surface evaluation of materials used in the production of orthodontic appliances. Thermal analysis, are discussed with the outcome that they support the assumption of a polymericĬross-linked network structure in the form of hyper-branched polymers.Ĭlinical success depends on the contact strength and wear resistance of medical devices made of polymer materials. (DSC) and mechanical characterization, such as stress–strain experiments and dynamic mechanical Results of the thermogravimetric analysis (TGA), the dynamic scanning calorimetry Copolymers with 15%–30% DIBĪct, on the one hand, as thermoplastics and, on the other hand, as vitreous thermosets with a DIB Retention containing 12.5%–30% DVB as well as low viscose waxy plastomers with a high flowīehavior containing a high DVB content of 30%–35% were obtained. Plastomers with low elastic content and high shape (DVB) and 1,3-diisopropenylbenzene (DIB).
The investigated comonomers are divinylbenzene Varying the monomers as well as the feed content. The polymeric material properties of these sulfur copolymers can be controlled significantly by Hyperbranched polymeric sulfur networks that provide a high thermal resistance (>220 ☌). Present study, we synthesized a 200 g scale of amorphous, hydrophobic as well as translucent, The mechanical and electrical properties of the products are virtually unexplored. Is used to prepare polymeric structures derived from sulfur and divinyl comonomers. One promising method is the inverse vulcanization, which Recently, new methods have been developed for the utilization of elemental sulfur as aįeedstock for novel polymeric materials.
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