The integration of additive manufacturing (3D printing) in the biomedical sector required material to portray a holistic characteristic in terms of printability, biocompatibility, degradability, and mechanical properties. This research aims to evaluate the 3D printability and mechanical properties of polyhydroxybutyrate (PHB) as additives in the urethane dimethacrylate (UDMA) based resin and its potential for medical applications. The printability of the PHB/UDMA resin blends was limited to 11 wt.% as it reached the maximum viscosity value at 2188 cP. Two-way analysis of variance (ANOVA) was also conducted to assess the significant effect of the varied PHB (wt.%) incorporation within UDMA resin, and the aging duration of 3D printed PHB/UDMA on mechanical properties in terms of tensile and impact properties. Meanwhile, the increasing crystallinity index (CI) of X-ray diffraction (XRD) in the 3D printed PHB/UDMA as the PHB loading increased, indicating that there is a strong correlation with the lower tensile and impact strength. FESEM images also proved that the agglomerations that occurred within the UDMA matrix had affected the mechanical performance of 3D printed PHB/UDMA. Nonetheless, the thermal stability of the 3D printed PHB/UDMA had only a slight deviation from the 3D printed UDMA since it had better thermal processability.

Additive manufacturing (AM), also known as 3D-printing technology, is currently integrated in many fields as it possesses an attractive fabrication process. In this work, we deployed the 3D-print stereolithography (SLA) method to print polyurethane acrylate (PUA)-based gel polymer electrolyte (GPE). The printed PUA GPE was then characterized through several techniques, such as Fourier transform infrared (FTIR), electrochemical impedance spectroscopy (EIS), X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and scanning electron microscope (SEM). The printed GPE exhibited high ionic conductivity of 1.24 × 10−3 S cm−1 at low-lithium-salt content (10 wt.%) in ambient temperature and favorable thermal stability to about 300 °C. The FTIR results show that addition of LiClO4 to the polymer matrix caused a shift in carbonyl, ester and amide functional groups. In addition, FTIR deconvolution peaks of LiClO4 show 10 wt.% has the highest amount of free ions, in line with the highest conductivity achieved. Finally, the PUA GPE was printed into 3D complex structure to show SLA flexibility in designing an electrolyte, which could be a potential application in advanced battery fabrication.

Poly(aryl-ether-ketone) materials (PAEKs), a class of high-performance polymers comprised of polyetheretherketone (PEEK) and polyetherketoneketone (PEKK), have attracted interest in standard dental procedures due to their inherent characteristics in terms of mechanical and biological properties. Polyetheretherketone (PEEK) is a restorative dental material widely used for prosthetic frameworks due to its superior physical, mechanical, aesthetic, and handling features. Meanwhile, polyetherketoneketone (PEKK) is a semi-crystalline thermoplastic embraced in the additive manufacturing market. In the present review study, a new way to fabricate high-performance polymers, particularly PEEK and PEKK, is demonstrated using additive manufacturing digital dental technology, or 3-dimensional (3D) printing. The focus in this literature review will encompass an investigation of the chemical, mechanical, and biological properties of HPPs, particularly PEEK and PEKK, along with their application particularly in dentistry. High-performance polymers have gained popularity in denture prosthesis in advance dentistry due to their flexibility in terms of manufacturing and the growing interest in utilizing additive manufacturing in denture fabrication. Further, this review also explores the literature regarding the properties of high-performance polymers (HPP) compared to previous reported polymers in terms of the dental material along with the current advancement of the digital designing and manufacturing.

Statement of problem. Current 3-dimensionally (3D) printed denture bases have inadequate strength and durability for long-term use, and milled denture bases generate excessive waste. Addressing these limitations is crucial to advancing prosthetic dentistry, ensuring improved patient outcomes and promoting environmental responsibility. Purpose. The purpose of this in vitro study was to incorporate microparticles into a commercially available 3D printed denture base resin and compare its mechanical and biological properties with the conventional polymethyl methacrylate (PMMA) denture base material. Material and methods. Microparticles were collected from milled zirconia blanks and were blended with a 3D printing denture base resin (NextDent Denture 3D+). The optimal zirconia microparticle content (2%) for blending and printed was determined by using a liquid-crystal display (LCD) 3D printer. The printed specimens were then postrinsed and postpolymerized based on the manufacturer’s instructions. Mechanical and biological characterization were carried out in terms of flexural strength, fracture toughness, and fungal adhesion. One-way ANOVA was carried out to analyze the results statistically. Results. The incorporation of microparticles in the 3D printed denture demonstrated higher mechanical strength (104.77 ±7.60 MPa) compared with conventional heat-polymerized denture base resin (75.15 ±24.41 MPa) (P<.001), but the mechanical strength deteriorated when compared with the unmodified 3D printing resin (122.17 ±11.58 MPa) (P<.001). However, the modified 3D printed denture showed greater antibacterial activity (1184.00 ±243.25 CFU/mL) than the unmodified resin (1486.50 ±103.94 CFU/mL) (P=.045). Conclusions. The incorporation of microparticles into the 3D printed denture base resin demonstrated the potential to enhance the mechanical and biological properties of the denture base when compared with conventional techniques. However, when compared with the unmodified 3D printed denture base resin, the mechanical properties deteriorated while the biological properties improved. (J Prosthet Dent xxxx;xxx:xxx-xxx)

Three-dimensional printing is increasingly applied in dentistry to fabricate denture bases. Several 3D-printing technologies and materials are available to fabricate denture bases, but there is data scarcity on the effect of printability, mechanical, and biological properties of the 3D-printed denture base upon fabricating with different vat polymerization techniques. In this study, the NextDent denture base resin was printed with the stereolithography (SLA), digital light processing (DLP), and light-crystal display (LCD) technique and underwent the same post-processing procedure. The mechanical and biological properties of the denture bases were characterized in terms of flexural strength and modulus, fracture toughness, water sorption and solubility, and fungal adhesion. One-way ANOVA and Tukey’s post hoc were used to statistically analyze the data. The results showed that the greatest flexural strength was exhibited by the SLA (150.8 ± 7.93 MPa), followed by the DLP and LCD. Water sorption and solubility of the DLP are significantly higher than other groups (31.51 ± 0.92 µg mm3 ) and 5.32 ± 0.61 µg mm3 , respectively. Subsequently, the most fungal adhesion was found in SLA (221.94 ± 65.80 CFU/mL). This study confirmed that the NextDent denture base resin designed for DLP can be printed with different vat polymerization techniques. All of the tested groups met the ISO requirement aside from the water solubility, and the SLA exhibited the greatest mechanical strength.

In this work, a plant-based resin gel polymer electrolyte (GPE) was prepared by stereolithography (SLA) 3D printing. Lithium perchlorate (LiClO4) with a concentration between 0 wt.% and 25 wt.% was added into the plant-based resin to observe its influence on electrical and structural characteristics. Fourier transform infrared spectroscopy (FTIR) analysis showed shifts in the carbonyl, ester, and amine groups, proving that complexation between the polymer and LiClO4 had occurred. GPEs with a 20 wt.% LiClO4 (S20) showed the highest room temperature conductivity of 3.05 × 10−3 S cm−1 due to the highest number of free ions as determined from FTIR deconvolution. The mobility of free ions in S20 electrolytes was also the highest due to greater micropore formation, as observed via field emission scanning electron microscopy (FESEM) images. Transference number measurements suggest that ionic mobility plays a pivotal role in influencing the conductivity of S20 electrolytes. Based on this work, it can be concluded that the plant-based resin GPE with LiClO4 is suitable for future electrochemical applications.

Cultured meat has become a trending nowadays. The future of 3D food products is gaining momentum in the coming years. the industry is creating a new paradox where technology is rapidly developing to cope with such big changes. However, several key areas are lacking in particular in Halal forensics where the issues of 3DP meat are are still not discussed thoroughly. This study is emphasizing on the review of halal forensics issues in three-dimensional (3D) printing technology for halal cultured meat. The study uses content analysis methods on published scientific papers and authoritative sources in related fields. The issues presented should be addressed so that the latest technology in the field of nutrition can be utilized to the fullest, especially for the sake of Muslim consumers. Authorities in the fatwas and Islamic jurisprudence should infer specific fatwas in the topic of cultured meat. More research has to be conducted to determine the long-term and short-term effects of this cultured meat on the human body. Matter such as a new analytical method should be proposed and developed to ensure the Halal status of the 3DP meat. Such a method will reduce the vulnerability of Halal food against Halal food fraud. Furthermore, the studies done will be used as a regulatory framework and gold standard for 3DP Halal food products in particular ingredient that contains meat. This study will be a good indicator of the status of 3DP halal food and the potential research that can be conducted in this field.

Today, additive manufacturing (AM) is considered one of the vital tenets of the industry 4.0 revolution due to its high productivity, decentralized production and rapid prototyping. This work aims to study the mechanical and structural properties of polyhydroxybutyrate as an additive in blend materials and its potential in medical applications. PHB/PUA blend resins were formulated with 0 wt.%, 6 wt.%, 12 wt.% and 18 wt.% of PHB concentration. Stereolithography or an SLA 3D printing technique were used to evaluate the printability of the PHB/PUA blend resins. Additionally, from FESEM analysis, a change was observed in PUA’s microstructure, with an additional number of voids spotted. Furthermore, from XRD analysis, as PHB concentration increased, the crystallinity index (CI) also increased. This indicates the brittleness properties of the materials, which correlated to the weak performance of the tensile and impact properties. Next, the effect of PHB loading concentration within PHB/PUA blends and aging duration towards the mechanical performance of tensile and impact properties was also studied by using analysis of variance (ANOVA) with a two-way method. Finally, 12 wt.% of PHB/PUA was selected to 3D print the finger splint due to its characteristics, which are compatible to be used in finger bone fracture recovery.

Dentistry is a part of the field of medicine which is advocated in this digital revolution. The increasing trend in dentistry digitalization has led to the advancement in computer-derived data processing and manufacturing. This progress has been exponentially supported by the Internet of medical things (IoMT), big data and analytical algorithm, internet and communication technologies (ICT) including digital social media, augmented and virtual reality (AR and VR), and artificial intelligence (AI). The interplay between these sophisticated digital aspects has dramatically changed the healthcare and biomedical sectors, especially for dentistry. This myriad of applications of technologies will not only be able to streamline oral health care, facilitate workflow, increase oral health at a fraction of the current conventional cost, relieve dentist and dental auxiliary staff from routine and laborious tasks, but also ignite participatory in personalized oral health care. This narrative article review highlights recent dentistry digitalization encompassing technological advancement, limitations, challenges, and conceptual theoretical modern approaches in oral health prevention and care, particularly in ensuring the quality, efficiency, and strategic dental care in the modern era of dentistry. Keywords: big data; digital dentistry; artificial intelligence; internet of things; augmented reality; dental implants

Polymers remain an integral part of denture fabrication materials, specifically polymethylmetacrylate (PMMA). PMMA has been extensively used, particularly in construction as a denture base material. Nonetheless, various challenges, including microbial threats in the form of candidiasis occurrence, still remain a biological challenge to denture wearers. The present article comprehensively reviews the biomodifications introduced to denture components, in particular denture base material, to improve the overall biological properties, together with physical, mechanical, structural integrity, and optical properties. In addition, fundamental information specifically to PMMA as a conventional denture base material and the causative aetiological microbial agents for biological threat to dentures are explored

In this paper, a multi-use perturbed rectangular cavity resonator is fabricated using additive manufacturing (3D printing) for profiling small volume liquid samples. The designed cavity operates in the fundamental mode 𝑇𝐸101 and is suitable for characterizing liquids in smaller volumes (<1 ml). A cylindrical perturbation is created on the top wall of the cavity into which the liquid samples are introduced. Depending on the dielectric constant of the sample, the resonance frequency of the cavity changes and the change in resonance is monitored in real-time. The dielectric constant of the sample under test is theoretically estimated based on the change in resonance and compared to standard reported values. The fabricated resonator is of multi-use nature and requires small sample volume of 0.35 ml for profiling. The low-cost, light-weight, multi-use sensor can be easily adapted for quality control applications across the supply chain.

The emergence of three-dimensional printed (3DP) technology in the food industry is one of the possibilities for a source of global halal food supply in the future. Producing individualized nutritional meals, food sustainability, and developing new solutions worldwide are just a few of the benefits of using 3DP. However, there are still issues with 3DP, especially regarding safety issues and all the risks to the consumer that needs to be overcome. Besides, it will safeguard each essential component of food production for commercial purposes and acceptance by the public. The objective of this study is to gather information regarding the potential of 3DP as well as its availability in the halal market. This study revolves around the five main pillars of halal forensics for halal-based products. This qualitative study employs library research as the data collection method. Data were analysed using content analysis method. Based on this study, a new regulatory framework for halal 3DP food products can be suggested through the halal forensics concept. This allows the authenticity of halal 3DP food products to be certified to safeguard consumers when consuming especially the Muslim community.

The three-dimensional printing (3DP) process provides the ability to formulate innovative food ingredients that enhanced nutritional benefits as well as sensory profiles. 3DP technology is an alternative method in food processing which include the production of halal based products. Despite the rapid development of 3DP in recent years, there is still concern surrounding the technology such as quality, manufacturing process capability, taste, structure, or shape, and binding mechanism are some of the factors that can still be improved. The addition of binding components, for example, gelatin from an animal to enhance the meat processing will be subjected to debate based on the Halal guidelines. In today's world, the issues regarding food safety are discussed where the producers use inadequate instruments, unsterilized plating, and mixing non-halal based products with the halal based product. This article reviews the need for new standards and regulations for halal printed products, in particular meat-based products. Conventional standards and regulations for halal processing meat need to be revised according to the technology in food science and engineering. Consequently, other issues including ethical issues need to be addressed from different Islamic perspectives to provide strong foundations for 3DP halal meat standards and regulations. This study suggests for further in-depth research to be conducted in this field and urges scholars to view this as a fast-growing research field in Halal studies.