Publications by authors named "Paulo Coelho"

Air pollution constitutes a significant worldwide environmental challenge, presenting threats to both our well-being and the purity of our food supply. This study suggests employing Recurrent Neural Network (RNN) models featuring Long Short-Term Memory (LSTM) units for forecasting PM10 particle levels in multiple locations in Skopje simultaneously over a time span of 1, 6, 12, and 24 hours. Historical air quality measurement data were gathered from various local sensors positioned at different sites in Skopje, along with data on meteorological conditions from publicly available APIs.

View Article and Find Full Text PDF

This paper presents an inquiry of scholarly literature published in the last decade pertaining to the development of robot grippers for compressed fabric parts, which are both rigid and porous. The study is narrow and targeted. Previous literature reviews investigating technologies suitable for materials with similar properties were analysed, and the need for recent works addressing stiff and simultaneously permeable materials was identified.

View Article and Find Full Text PDF

Large osseous defects resulting from trauma, tumor resection, or fracture render the inherent ability of the body to repair inadequate and necessitate the use of bone grafts to facilitate the recovery of both form and function of the bony defect sites. In the United States alone, a large number of bone graft procedures are performed yearly, making it an essential area of investigation and research. Synthetic grafts represent a potential alterative to autografts due to their patient-specific customizability, but currently lack widespread acceptance in the clinical space.

View Article and Find Full Text PDF

The unique screw-shape design and microstructure of implants pose a challenge for mechanical debridement in removing biofilms. Biofilms exhibit increased resistance to antimicrobials relative to single planktonic cells, emphasizing the need for effective biofilm removal during periodontal therapy for peri-implantitis treatment. To tackle this issue, our team evaluated the effectiveness of low-temperature plasma (LTP) for disinfecting titanium discs contaminated with multispecies biofilms associated with peri-implantitis, specifically focusing on biofilms matured for 14 and 21 days as well as biofilms that had formed on Straumann Ti-SLA implants for 21 days.

View Article and Find Full Text PDF

Bone nonunion following a fracture represents a significant global healthcare challenge, with an overall incidence ranging between 2 and 10% of all fractures. The management of nonunion is not only financially prohibitive but often necessitates invasive surgical interventions. This comprehensive manuscript aims to provide an extensive review of the published literature involving growth factors, stem cells, and novel delivery mechanisms for the treatment of fracture nonunion.

View Article and Find Full Text PDF

Bone tissue regeneration is a rapidly evolving field aimed at the development of biocompatible materials and devices, such as scaffolds, to treat diseased and damaged osseous tissue. Functional scaffolds maintain structural integrity and provide mechanical support at the defect site during the healing process, while simultaneously enabling or improving regeneration through amplified cellular cues between the scaffold and native tissues. Ample research on functionalization has been conducted to improve scaffold-host tissue interaction, including fabrication techniques, biomaterial selection, scaffold surface modifications, integration of bioactive molecular additives, and post-processing modifications.

View Article and Find Full Text PDF

Biomimetics is the science of imitating nature's designs and processes to create innovative solutions for various fields, including dentistry and craniofacial reconstruction. In these areas, biomimetics involves drawing inspiration from living organisms/systems to develop new materials, techniques, and devices that closely resemble natural tissue structures and enhance functionality. This field has successfully demonstrated its potential to revolutionize craniofacial procedures, significantly improving patient outcomes.

View Article and Find Full Text PDF

This review focuses on advancements in polymer science as it relates to three-dimensional (3D) and four-dimensional (4D) printing technologies, with a specific emphasis on applications in the biomedical field. While acknowledging the breadth of 3D and 4D printing applications, this paper concentrates on the use of polymers in creating biomedical devices and the challenges associated with their implementation. It explores integrative modeling and experimental insights driving innovations in these fields, focusing on sustainable manufacturing with biodegradable polymers, a comparative analysis of 3D and 4D printing techniques, and applications in biomedical devices.

View Article and Find Full Text PDF

Background: Polylactic acid (PLA) has been extensively used in tissue engineering. However, poor mechanical properties and low cell affinity have limited its pertinence in load bearing bone tissue regeneration (BTR) devices.

Objective: Augmenting PLA with β-Tricalcium Phosphate (β-TCP), a calcium phosphate-based ceramic, could potentially improve its mechanical properties and enhance its osteogenic potential.

View Article and Find Full Text PDF
Article Synopsis
  • Osseodensification enhances the stability of endosteal implants but doesn't consider the limited trabecular bone found in clinical situations.
  • This study involved surgical experiments on twelve sheep, comparing osteotomy healing with and without trabecular bone, using osseodensification drilling to place implants.
  • Results showed enhanced bone formation and remodeling in the group with trabecular bone, with significant increases in bone-to-implant contact and bone area occupancy at both 3 and 12 weeks; there were no negative effects noted in the absence of trabecular bone.
View Article and Find Full Text PDF
Article Synopsis
  • * This study introduces a novel method for classifying schizophrenia using EEG signals from the brain, with data collected from 28 subjects, analyzing brain activity across different frequency bands and applying various techniques to enhance signal clarity.
  • * The findings indicate that the Support Vector Machine (SVM) algorithm, particularly with Log Energy entropy features in a 1-second window, performed the best in classifying schizophrenia, highlighting the importance of feature selection in achieving accurate diagnoses.
View Article and Find Full Text PDF

The purpose of this in vitro study was to develop calcium sulfate (CS)-based disks infused with an antimicrobial drug, which can be used as a post-surgical treatment modality for osteomyelitis. CS powder was embedded with 10% antibiotic, amoxicillin (AMX) or moxifloxacin (MFX), to form composite disks 11 mm in diameter that were tested for their degradation and antibiotic release profiles. For the disk degradation study portion, the single drug-loaded disks were placed in individual meshes, subsequently submerged in phosphate-buffered saline (PBS), and incubated at 37 °C.

View Article and Find Full Text PDF
Article Synopsis
  • Surface pre-reacted glass-ionomer (S-PRG) is a bioactive dental filler that releases ions to help prevent plaque adhesion on teeth and may influence osteoclasts in dental bone.
  • This study explored how S-PRG eluate affects osteoclast generation and mineral dissolution using in vitro tests with RAW264.7 cells, examining gene expression and protein signaling related to osteoclast differentiation.
  • Findings revealed that certain dilutions of S-PRG eluate were not toxic to the cells, but significantly reduced osteoclast formation and mineral breakdown, suggesting potential benefits for treating root caries and preventing bone loss.
View Article and Find Full Text PDF
Article Synopsis
  • Three-dimensional (3D) bioprinting has evolved as a groundbreaking technology in surgery, facilitating advancements in reconstructive and regenerative medicine over the past five years.
  • Recent literature showcases innovations in creating complex, patient-specific tissues and organs that closely resemble natural tissue, enhancing surgical interventions.
  • Despite significant progress, challenges remain such as vascularization, integration with existing tissues, and long-term viability, highlighting the need for continued research and regulatory support to maximize its clinical potential.
View Article and Find Full Text PDF

Periodontitis is a bacteria-induced chronic inflammatory disease characterized by degradation of the supporting tissue and bone in the oral cavity. Treatment modalities seek to facilitate periodontal rehabilitation while simultaneously preventing further gingival tissue recession and potentially bone atrophy. The aim of this study was to compare two differently sourced membranes, a resorbable piscine collagen membrane and a porcine-derived collagen membrane, in the repair of soft tissue defects utilizing a preclinical canine model.

View Article and Find Full Text PDF

Objectives: To evaluate the effects of dentin biomodification agents (Proanthocyanidin (PAC), Cardol (CD) and Cardol-methacrylate (CDMA) on dentin hydrophilicity by contact angle measurement, viability of dental pulp stem cells (DPSCs) and nanomechanical properties of the hybrid layer (HL).

Methods: CDMA monomer was synthesized from cardol through methacrylic acid esterification. Human extracted third molars were used for all experiments.

View Article and Find Full Text PDF

The use of porcine-derived collagen membranes (PDCM) to improve intraoral soft tissue rehabilitation remains under investigation. Different degrees of crosslinking have yielded differences in resorption time and inflammation surrounding collagen membranes. The aim of this study was to evaluate the in vivo performance of bilayered PDCMs with varying degrees of crosslinking for the regeneration of oral soft tissue defects.

View Article and Find Full Text PDF

Objectives: To assess the effects of different aging protocols on chemical, physical, and mechanical properties of an experimental ATZ composite compared to a zirconia.

Methods: Disc-shaped specimens were obtained through uniaxial pressing of commercial powders (Tosoh), ATZ comprised of 80%ZrO/20%AlO (TZ-3YS20AB) and 3Y-TZP (3Y-SBE). The specimens of each material were divided into different groups according to the aging protocol: immediate, autoclave aging and hydrothermal reactor aging.

View Article and Find Full Text PDF

Bone regeneration remains a significant clinical challenge, often necessitating surgical approaches when healing bone defects and fracture nonunions. Within this context, the modulation of adenosine signaling pathways has emerged as a promising therapeutic option, encouraging osteoblast activation and tempering osteoclast differentiation. A literature review of the PubMed database with relevant keywords was conducted.

View Article and Find Full Text PDF
Article Synopsis
  • Odontogenic cutaneous fistula (OCF) is a condition where a pathological connection forms between the skin on the face and the oral cavity, often linked to chronic dental infections.
  • Many cases of OCF are misdiagnosed, leading patients to endure unnecessary treatments like surgeries and antibiotics before receiving the correct diagnosis.
  • This systematic review aims to highlight the various presentations of OCF, raise awareness among medical professionals, and stress the importance of timely diagnosis and appropriate management.
View Article and Find Full Text PDF

Finger entrapment with rings or ring-like objects is an uncommon possible hand emergency. In cases in which noncutting removal is ineffective, ring cutters or dental drills with carbide or diamond burs have been successfully used. However, objects composed of hard metallic alloys, such as lug nuts or wrenches, are often resistant to such equipment.

View Article and Find Full Text PDF

Background: Velopharyngeal insufficiency (VPI) is a condition characterized by incomplete separation of the oral and nasal cavities during speech production, thereby leading to speech abnormalities and audible nasal emissions. Subsequently, this adversely impacts communication and potentially interpersonal social interactions. Autologous fat grafting (AFG) to the velopharynx, a minimally invasive technique, aims to improve oronasal separation by providing bulk and advancing the posterior pharyngeal wall toward the soft palate.

View Article and Find Full Text PDF

This manuscript reviews the transformative impact of 3-dimensional (3D) printing technologies in the treatment and management of cleft lip and palate (CLP), highlighting its application across presurgical planning, surgical training, implantable scaffolds, and postoperative care. By integrating patient-specific data through computer-aided design and manufacturing, 3D printing offers tailored solutions that improve surgical outcomes, reduce operation times, and enhance patient care. The review synthesizes current research findings, technical advancements, and clinical applications, illustrating the potential of 3D printing to revolutionize CLP treatment.

View Article and Find Full Text PDF

Background: Non-perforated Polytetrafluoroethylene (PTFE) membranes are effectively utilized in guided bone regeneration (GBR) but may hinder cell migration due to limited interaction with the periosteum. This study compared bone regeneration using occlusive or perforated membranes combined with acellular collagen sponge (ACS) and recombinant human bone morphogenic protein-2 (rhBMP-2) in a canine mandibular model.

Material And Methods: Male beagle dogs (n=3) received two mandibular defects each to compare ACS/rhBMP-2 with experimental (perforated group) and control (non-perforated group) membranes (n=3 defects/group).

View Article and Find Full Text PDF