Studies Regarding the Architectural Design of Various Composites and Nanofibres Used in Dental Medicine

Abstract

The aim of this study was represented by the definition and testing of a new formulation strategy and the functionality of composite materials, while ensuring the optimization of the relevant properties for the dental restoration processes through the use of precise techniques of characterization, the modification and functionality of the components in view of obtaining results that are characterized by an optimum biomechanical and bioactive relation, in full agreement with the particularities of the dental structure that requires restoration. In view of obtaining new resistant composite structures we made a number of 10 samples including extracted teeth with various losses of dental substance and the structural modifications included 3 types of composites, whose structure was improved by the introduction of inorganic fillings based on hydroxyapatite and silver nanoparticles. All these structures were reinforced with two types of fibers, Reforpost fiber glass kit (Angelus) and Fiber post Schulzer Pre-silanized; With regard to the use of composite structures improved by HA addition, we notice a slight lacunary structure on the SEM images due to the properties of HA, an aspect present at much smaller dimensions in the silver � HA mix. The size of the grains associated with their continuous uniformity and adherence for the fibrillar structure stands out at the samples with hydroxyapatite, the first place as uniformity and adherence going to the composite of the nanofiller technology category.

Comparative Study Regarding the Effect of Different Finishing and Polishing Systems on a Bulk-Fill Composite Resin Surface

“…These results are in agreement with a series of studies which have shown that the smoothest composite resin surface is obtained when the material is light-cured in tight contact with a celluloid matrix [13][14][15]. The superficial layer, polymerized in contact with COMPARATIVE STUDY REGARDING THE EFFECT OF DIFFERENT FINISHING AND POLISHING SYSTEMS ON A BULK-FILL COMPOSITE RESIN SURFACE Original Article the celluloid matrix has a higher organic content than the underlying layer [16][17][18] and the removal of this layer by finishing and polishing procedure will increase the surface resistance of the material [19,20]. However, the anatomical contour of the restoration is rarely achieved only by the use of the celluloid matrix [21,22], so most of the time it is necessary to use the finishing and polishing instruments to remove the material in excess and to obtain the shape and the appearance of the restoration closer to the natural tooth.…”

The Effect of a Plasma With Platelet-rich Fibrin in Bone Regeneration and on Rate of Orthodontic Tooth Movement in Adolescents

“…PRF stimulates human osteoblastic proliferation, and histology has shown it to have an effect on neoangiogenesis. PRF is a second-generation platelet concentrate and is a gel-like matrix that contains high concentration of nonactivated, functional, intact platelets contained within a fibrin matrix that releases a relatively constant concentration of growth factors over a period of 7 days [1,[22][23][24][25][26][27][28][29][30][31][32][33][34].…”

OCT Application in Direct Dental Restorations Marginal Fit Evaluation

“…A recent study investigated the performance of dental amalgam comparative with dental composite in extensive posterior restorations [30]. Different risk factors for restoration failure like age, sex, alcohol consumption, smoking, diabetes, periodontal status and also matrix metalloproteinase genetic polymorphisms were analysed [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. Data obtained from this study showed similar rates of failure for amalgam and composites up to 5 years, the authors concluding that resin composites could replace amalgam for posterior extensive restorations.…”