The objective of this paper is to present the thermal behavior of various PMMA/TiO2 nanocomposite for complete dentures fabrication with 3D printing technology. There have been prepared and thermally characterized polymeric composites with varied nanofiller content ranging between 0.2% and 2.5% (w/w%). The nanocomposites proved a better thermal performance than that of pure copolymer PMMA-MMA or 3D printing PMMA polymer complex matrix. A small difference in glass transition (Tg) temperature for all compounds studied was recorded.

The present paper is focused on analyzing if appropriate adhesion between the polymeric matrix and titania filler nanoparticles is obtained for the PMMA-TiO2 photo-curable dental material, suitable for application in RP - stereolithography (SLA) for complete denture manufacturing. It was found that different amounts, between 0.2% and 2.5 % (w/w%), of added titanium oxide nanoparticles slightly modify the structural behavior of the PMMA polymeric matrix. The material characterization was carried out using FT-IR and microscopy techniques.

A coated wire calcium selective microelectrode for biological use was developed, comprising a PVC selective matrix containing calcium ionophore IV coated on copper wire, previously covered with a solid-state contact mixture. The obtained calcium microsensor presented a Nernstian answer in a concentration range of 10-1 to 10-6 mol/L. The selectivity coefficients over the main interfering ions of biological interest proved that the calcium microelectrode is highly selective. Also, the response time (6s) and repeatability have been determined. The pH variation did not significantly modify the calcium microelectrode answer, being stable over the pH range (6.7-7.3) of interest. The obtained calcium microelectrode is simple, inexpensive and able to give reliable electrochemical response, recommending itself as a solution for assessing the level of inorganic ions of the gingival crevicular fluid and saliva.

We report the statistical parameters associated with the dynamic characteristics of a calcium microelectrode. The electrochemical behavior of the obtained microsensor was assessed against the main interferents.

ÖzToday's scientific and technical advances have led to significant advances in biosensor technology, leading to widespread use of biosensors in areas such as food technology, the environment, pharmaceuticals and clinical diagnostics, biochemistry, and analytical chemistry. Improvements in the ion-selective sensor technology used in the preparation of potentiometric biosensors and the increase in the number of sensor materials have also accelerated the development of new types of potentiometric biosensors. Thus, in this study, information is given on the development of a new micro sized potentiometric glucose biosensor based on composite pH sensor. Glucose oxidase was immobilized on the composite layer as the biorecognition element. The surface of glucose biosensor based composite pH sensing matrices was first examined for electrochemical elucidation by using cyclic voltammetry and electrochemical impedance spectroscopy. The rate of electron transfer resulted in a stable response behavior of the biosensor and made it a suitable potentiometric sensor for detection of glucose. A linear response in concentration range from 5x10-5 to 1x10 -1 mol/L was obtained with a detection limit of 2x10 -5 mol/L for the potentiometric detection of glucose. The biosensor exhibited a fast response time (10 s), had good stability, and an extended lifetime.