Could the Old Poly(methylmethacrylate) Face Arrising Challanges of New Advanced Technologies for Dental Prosthesis Manufacturing?

The biocompatibility, relatively low cost and excellent aesthetic appearance of polymer Poly(methyl methacrylate) (PMMA) makes it the material of choice for fabricating partially and complete dentures. Nowadays the emerging 3D printing technique imposed itself as reliable solution for obtaining dental devices. However, extensive usage of such technique is still limited due to the materials available. Despite PMMA�s drawbacks, mainly related to bacterial contamination, wear and mechanical failures, composite polymeric matrix has issued high interest lately. An important improvement in basic material properties have been achieved due to the inclusion of nanosystems, either nanoparticles or nanotubes. The newly shown versatility of reinforced PMMA sustains it as the best alternative for stereolithography (3D printing) technique. This paper highlights the improvements of PMMA by adding different type of nanofillers. Therefore, prospective randomized clinical in vivo studies with the use of biocompatible tested modified filled PMMA and modern technologies should be performed.

Download Full-text

A Novel Microscale 3D Printing Based on Electric-Field-Driven Jet Deposition

Volume 1: Additive Manufacturing; Bio and Sustainable Manufacturing ◽

10.1115/msec2018-6451 ◽

2018 ◽

Author(s):

Lei Qian ◽

Hongbo Lan ◽

Guangming Zhang ◽

Jiawei Zhao ◽

Shuting Zou

Keyword(s):

3D Printing ◽

Electric Field ◽

Low Cost ◽

Experimental Studies ◽

Counter Electrodes ◽

Micro Scale ◽

Multi Scale ◽

Printing Technique ◽

Jet Printing ◽

3D Printing Technique

This paper presents an electric-field-driven (EFD) jet deposition 3D printing technique, which is based on the induced electric field and electrohydrodynamic (EHD) cone-jetting behavior. Unlike the traditional EHD-jet printing with two counter electrodes, the EFD jet 3D printing only requires a nozzle electrode to induce an electric field between the nozzle and the target substrate. Taking into account both printing accuracy and printing efficiency, two novel working modes which involve pulsed cone-jet mode and continuous cone-jet mode, are proposed for implementing multi-scale 3D printing. In this work, significant relationships between the printing results and process parameters (voltage, air pressure, pulse duration time, and stage velocity) were investigated to guide the reliable printing in both working modes. Furthermore, the experimental studies were carried out to demonstrate the capabilities and advantages of the proposed approach, which included the suitability of various substrate, the capacity of conformal printing, and the diversity of the compatible materials. Finally, four typical printing results were provided to demonstrate the feasibility and effectiveness of the proposed technology for micro-scale 2D patterning and macro/microstructures multi-scale fabrication. As a result, this research provides a novel micro-scale 3D printing technique with low cost, high resolution and good generalizability. The breakthrough technique paves a way for implementing highresolution 3D printing, especially for multi-scale and multimaterial additive manufacturing.

Download Full-text

Fabrication of Porous Hydrogenation Catalysts by a Selective Laser Sintering 3D Printing Technique

ACS Omega ◽

10.1021/acsomega.9b00711 ◽

2019 ◽

Vol 4 (7) ◽

pp. 12012-12017 ◽

Cited By ~ 6

Author(s):

Elmeri Lahtinen ◽

Lotta Turunen ◽

Mikko M. Hänninen ◽

Kalle Kolari ◽

Heikki M. Tuononen ◽

...

Keyword(s):

3D Printing ◽

Selective Laser Sintering ◽

Laser Sintering ◽

Hydrogenation Catalysts ◽

Printing Technique ◽

3D Printing Technique

Download Full-text

Combustion of toluene over cobalt-modified MFI zeolite dispersed on monolith produced using 3D printing technique

Catalysis Today ◽

10.1016/j.cattod.2020.04.005 ◽

2020 ◽

Cited By ~ 1

Author(s):

Anna Rokicińska ◽

Marek Drozdek ◽

Elżbieta Bogdan ◽

Adam Węgrzynowicz ◽

Piotr Michorczyk ◽

...

Keyword(s):

3D Printing ◽

Mfi Zeolite ◽

Printing Technique ◽

3D Printing Technique

Download Full-text

Power spectral density-based nearinfrared sub-band detection for noninvasive blood glucose prediction in both in-vitro and in-vivo studies

Journal of Innovative Optical Health Sciences ◽

10.1142/s1793545818500359 ◽

2018 ◽

Vol 11 (06) ◽

pp. 1850035

Author(s):

Ibrahim Akkaya ◽

Erman Selim ◽

Mert Altintas ◽

Mehmet Engin

Keyword(s):

Blood Glucose ◽

Spectral Density ◽

Power Spectral Density ◽

Optical System ◽

Low Cost ◽

Linear Regression Analysis ◽

In Vivo Studies ◽

Power Spectral

Diabetes is a widespread and serious disease and noninvasive measurement has been in high demand. To address this problem, a power spectral density-based method was offered for determining glucose sensitive sub-bands in the nearinfrared (NIR) spectrum. The experiments were conducted using phantoms of different optical properties in-vitro conditions. The optical bands 1200–1300[Formula: see text]nm and 2100–2200[Formula: see text]nm were found feasible for measuring blood glucose. After that, a photoplethysmography (PPG)-based low cost and portable optical system was designed. It has six different NIR wavelength LEDs for illumination and an InGaAs photodiode for detection. Optical density values were calculated through the system and used as independent variables for multiple linear regression analysis. The results of blood glucose levels for 24 known healthy subjects showed that the optical system prediction was nearly 80% in the A zone and 20% in the B zone according to the Clarke Error Grid analysis. It was shown that a promising easy-use, continuous, and compact optical system had been designed.

Download Full-text