SAMUEL MADEIRA, MD

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This study examined how specially designed zirconia surfaces, which mimic natural tooth structures, affect human periodontal ligament fibroblasts, which are important for gum health. Researchers created zirconia pieces with tiny channels and porous coatings, finding that these features improved the adhesion and growth of fibroblasts. Specifically, the most successful surfaces had microchannels that were about 322 micrometers wide, leading to better cell attachment and movement compared to other designs. This research is important because it could lead to better dental implants that integrate more effectively with surrounding tissue, reducing complications. Who this helps: Patients needing dental implants.

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This study looked at elderly patients (aged 65 and older) who had surgery to fix a condition called atrial septal defect (ASD), which is a hole in the heart. Out of 706 patients, 37 were elderly, and while 68% of them lived longer than expected based on average life expectancy, 46% did die within about 9 years of the procedure. Patients who died earlier tended to have higher blood pressure in their lungs and more serious heart valve issues. Who this helps: This research benefits elderly patients and doctors by highlighting the importance of careful evaluation before heart procedures.

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This study looked at how different levels of pressure affect the strength of the bond between a type of zirconia material and a special cement used in dental work. The researchers found that when a high pressure of 195.15 kPa was applied, the cement layer was thinner (about 36.6 micrometers) and the bond strength was at its highest (58.8 MPa). In contrast, a very low pressure of 0.20 kPa resulted in thicker cement layers (73.2 micrometers) and weaker bonds (30.8 MPa), showing that applying the right pressure is essential for strong adhesion. Who this helps: This benefits dentists and their patients by improving the longevity of dental restorations.

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This study examined a protein called H3.14 in the plant Arabidopsis and how it responds to environmental stresses, like drought or heat. Researchers found that H3.14 quickly shows up in specific root cells under stress, influencing genes that either slow down growth or help the plant cope with difficult conditions. Understanding how H3.14 works can help improve how plants handle stress, which is important for better crop resilience. Who this helps: This helps farmers and agricultural researchers who want to develop hardier crops.

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This study explored how using electric current can help reduce bacteria on dental materials made from a type of plastic called PEEK, which is known for its safety and resistance to plaque. Researchers added silver to enhance its antibacterial properties and tested two types of electric currents: alternating current (AC) and direct current (DC). They found that AC was more effective in reducing bacterial growth, particularly showing a significant decrease at certain current levels. Who this helps: This benefits dental patients by potentially reducing infections linked to dental materials.

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This study looked at how doctors in Europe diagnose and treat a specific type of heart attack called MINOCA, which happens without blocked arteries. The researchers found that MINOCA is involved in about 10% of heart attack cases, but only 38% of doctors believe it raises the risk of serious future heart issues. Many centers had inconsistent practices, with 63% agreeing more tests were needed after a MINOCA diagnosis but only 22% following a thorough testing plan, highlighting the need for better guidelines and a standardized approach to treatment. Who this helps: This helps doctors and researchers by providing insights into improving care for patients who experience MINOCA.

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This study looked at how common coronary artery disease (CAD) is among people getting aortic valve replacement through a procedure called TAVI, and how CAD affects survival after the procedure. Out of 379 patients, 54% had obstructive CAD, and those with more complicated CAD had a lower chance of survival two years later, although overall, the presence of CAD didn't significantly change the survival rates for everyone. This research is important because it helps doctors understand which patients with CAD are at greater risk after undergoing TAVI, guiding their treatment decisions. Who this helps: This helps doctors and patients with aortic stenosis and CAD.

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Researchers studied the types of mosquitoes found in Lisbon Zoo from May 2018 to November 2019, discovering an average of 2.4 mosquitoes per trap each night. They identified five species that could spread mosquito-borne diseases, which raised some concern for viruses like West Nile and Usutu, especially since mosquito numbers peaked during summer. The findings highlight the importance of keeping mosquito populations in check to protect both zoo animals and visitors. Who this helps: This helps zoo staff and public health officials.

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The study focused on developing a new type of dental implant made from a material called zirconia, which was infused with silver to help fight bacteria that can cause infections around implants. The researchers found that when a small electric current was applied to these zirconia implants, bacteria could not attach to the surface, leading to a significant 99.99999% reduction in bacterial adhesion. This is important because it offers a new way to prevent infections associated with dental implants, which are common and often lead to serious complications. Who this helps: This benefits patients receiving dental implants and dentists who want to improve implant success rates.

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This review studied how applying electric current to dental implants can affect harmful biofilms that cause complications like peri-implantitis. The research involved seven studies, which showed that using electric current can help reduce or eliminate these biofilms, although the specific methods and parameters varied between studies. This is important because it could lead to better treatments for infections around dental implants, potentially improving outcomes for patients. Who this helps: Patients with dental implants.

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This study looked at the long-term health of younger patients (60 years old or younger) with less complex heart disease who could be treated using two different methods: coronary artery bypass surgery (CABG) and a less invasive procedure called percutaneous coronary intervention (PCI). Researchers found that those who had CABG had lower overall death rates (5.8 deaths per 1,000 person-years) compared to those who had PCI (14.0 deaths per 1,000 person-years) over an average follow-up of about 9.3 years. However, CABG patients had a higher risk of complications like stroke and death in the first 30 days after the procedure. Who this helps: This information is important for doctors and patients deciding on treatment options for young individuals with coronary artery disease.

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This study explored how to predict the risk of blocked coronary arteries in patients who have recently developed heart failure without a known cause. Out of 452 patients studied, 109 (about 24%) were found to have obstructive coronary artery disease. The researchers created a simple scoring system based on factors like being male, having diabetes, or smoking, which helps doctors determine the likelihood of coronary artery disease and decide on further tests needed. Who this helps: This helps doctors and patients with new heart failure symptoms identify potential heart issues more accurately.

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This paper looks at spontaneous coronary artery dissection (SCAD), a condition that mainly affects young to middle-aged women who don't have typical heart disease risk factors. It highlights that while traditional methods like invasive angiography are important for diagnosing SCAD, most patients benefit from a conservative treatment approach unless their condition is critical. The study also emphasizes the need for ongoing care since SCAD can recur, and long-term adjustments in lifestyle and medication are important. Who this helps: This helps patients, especially young women experiencing SCAD, and their healthcare providers.

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Researchers studied a device called the coronary sinus Reducer (CSR) to see if it helps patients with severe angina (heart pain) that doesn't improve with standard medications or surgery. Out of 24 patients treated, 75% experienced less severe angina after six months, many reported better quality of life, and they were able to reduce the number of heart medications they were taking. This is important because it offers a new treatment option for patients who have few alternatives left. Who this helps: Patients suffering from severe, treatment-resistant angina.

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This study looked at how well two materials, stainless steel and a plastic-like material called PEEK, wear down when used for children's dental crowns. It found that PEEK wore down much less than stainless steel, showing a lower friction and a lower wear rate, which means it lasts longer in the mouth. These findings are important because PEEK offers a better option for kids' dental crowns that is not only more durable but also looks nicer and is better for health. Who this helps: This benefits children needing dental crowns and their dentists.

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This study looked at a new dental tool designed to make sure that the parts attached to dental implants fit properly. Researchers created a verification device that checks the alignment of the implant components on a model of the patient’s mouth. They found that using this tool helps ensure a proper fit, which is crucial for reducing problems that can occur with dental implants. Who this helps: This benefits dentists and their patients receiving dental implants.

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This study looked at how different surface treatments on a material called Yttria-stabilized zirconia (YSZ), which is being explored as a replacement for titanium in dental implants, affect the behavior of bone and connective tissue cells. The researchers found that surface texturing through traditional milling improved bone cell survival and growth more than laser texturing did, but neither method was better than the standard sandblasting and acid-etching process currently in use. This is important because finding the best treatment for YSZ could lead to better dental implants, but the study showed that these new methods didn't outperform the existing ones. Who this helps: This helps dentists and dental implant patients.

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Researchers studied a new type of coating for dental implants made from a material called zirconia, which is often used instead of titanium. They created silica coatings with specific patterns and found that these patterns made the surface rougher and better at sticking to bone, which is important for successful healing. The results showed that these patterned coatings maintained their strength even after being tested against hard bone surfaces, suggesting they could help teeth implants bond better to the jawbone and reduce the risk of infection. Who this helps: This research benefits dental implant patients.

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This study looked at how different surface textures—grooves and pores—on zirconia dental implants affect cell behavior. Researchers grew two types of cells for 14 days on these textured surfaces and compared their growth and activity. They found that while cells could attach and grow on all surface types, the different textures did not lead to any significant differences in cell health or function. Who this helps: This research benefits dental implant developers and practitioners by confirming that additional surface textures may not improve implant performance for patients.

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This study looked at how the Covid-19 pandemic affected hospital admissions for a serious heart condition called ST-elevation myocardial infarction (STEMI) in two hospitals in Portugal. Researchers found that during the first wave of the pandemic, only 16.5 patients per month were admitted for STEMI compared to 26.0 in previous years, and the death rate increased significantly from 1.9% to 12.1%. This is important because it highlights that fewer patients were seeking help for severe heart problems, leading to worse outcomes during the pandemic. Who this helps: This information is valuable for doctors and health officials aiming to improve responses to cardiovascular emergencies during public health crises.

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This study looked at a 28-year-old man with long-term low oxygen levels due to complex heart problems. Initially thought to be caused by certain heart defects, doctors later found a different issue that was affecting his heart function. After surgery to fix this problem, the patient felt better, highlighting how important it is to use various tests to accurately diagnose and treat heart defects. Who this helps: This helps patients with complex congenital heart disease.

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This study looked at how two types of cells, which are important for gum and bone health, reacted to textured zirconia surfaces used in dental implants. Researchers found that cells on surfaces with larger grooves showed more activity related to bone formation compared to those with smaller grooves and a smooth surface. Specifically, alkaline phosphatase activity and osteopontin secretion were significantly higher on surfaces with larger grooves, even though overall cell health and growth were similar across all surface types. Who this helps: This research benefits dental professionals and patients receiving implants, as it provides insights into how implant surface texture can influence bone health.

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This study looked at how different textures created by a laser on zirconia dental implants affect the behavior of two types of cells: gingival fibroblasts (which help with gum health) and osteoblasts (which are involved in bone formation). Researchers tested 60 zirconia disks with varying microgroove sizes and found that while the cells attached and grew well on all surfaces, there was no significant difference in their overall growth or activity levels, regardless of the surface texture. This matters because it suggests that changing the surface of zirconia implants with laser grooves may not offer additional benefits over existing surface treatments. Who this helps: This helps patients receiving dental implants, ensuring consistent outcomes regardless of surface modifications.

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Researchers developed a new hybrid surface for dental implants that combines titanium and zirconia to prevent wear and improve performance. They found that this new surface significantly reduces wear by about 93%, which means fewer metal particles are released into the body that could cause problems. This is important because it can lead to better long-term outcomes for patients who receive dental implants. Who this helps: Patients receiving dental implants.

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The study looks at refractory angina, which is chest pain that continues for over three months despite the best treatments. It highlights a new device called the coronary sinus reducer, which appears to be safe and effective in reducing symptoms and improving the quality of life for these patients. This matters because it offers hope for patients who have not found relief from traditional treatments. Who this helps: Patients suffering from refractory angina.

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This study looked at customized dental implants designed to better match natural tooth roots, which are becoming popular because they can save more surrounding tissues and reduce the need for a second surgery, resulting in higher patient satisfaction. The review analyzed 15 clinical trials and case reports, finding that these implants performed well, showing no signs of infection or other complications during follow-up periods. This matters because these advanced implants can improve the success of dental procedures and enhance the quality of life for patients needing dental replacements. Who this helps: Patients needing dental implants.

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This study looked at a new way to take dental impressions using a digital scanner while the teeth are protected by a rubber dam. The researchers found that this method allows for clearer and more accurate scans without interference from blood or saliva, making it quicker and easier for dentists. Using this technique can improve the quality of dental work and save time during the process. Who this helps: This benefits patients getting dental restorations and dentists performing the procedures.

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This study looked at a new treatment option called the coronary sinus reducer for patients with refractory angina, which is chest pain that continues for over three months despite other treatments. The findings show that this device might improve symptoms and quality of life, although there isn't a lot of data yet to support its effectiveness fully. This is important because refractory angina can severely lower a person's quality of life and put extra strain on healthcare systems. Who this helps: This helps patients with refractory angina looking for relief from their symptoms.

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This study created a DNA library to help identify different mosquito species in Portugal, which is important for controlling diseases they carry. Researchers successfully collected and analyzed DNA from mosquitoes, resulting in 98 unique DNA sequences that matched 26 species. This is the first thorough effort combining both physical and genetic methods to classify mosquitoes in Portugal, making it easier for scientists to monitor and understand mosquito populations. Who this helps: This helps public health officials and researchers in monitoring and controlling mosquito-borne diseases.

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This study looked at how different textured zirconia surfaces, used in dental implants, affect the adhesion of bacteria, which is important for preventing infections. Researchers found that the bacteria E. coli stuck more to channelled zirconia surfaces (7.15 million bacteria per milliliter), while Staphylococcus aureus and Pseudomonas aeruginosa adhered better to a titanium surface (1.07 million and 8.43 million bacteria per milliliter, respectively). These findings are significant because reducing bacterial adhesion can lead to better dental implant success and lower the risk of infections. Who this helps: This helps patients needing dental implants.

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This study looked at how well patients with a common heart condition called non-valvular atrial fibrillation followed their treatment plan using new blood-thinning medications known as direct oral anticoagulants (DOACs). It found that about half (51%) of the 264 patients didn't take their medication as prescribed. Key reasons for this included longer treatment duration, taking medications that required more frequent doses, and higher out-of-pocket costs for patients. Who this helps: This information is valuable for doctors and healthcare providers working to improve medication adherence in atrial fibrillation patients.

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This study compared two heart valve replacement methods—surgical aortic valve replacement (SAVR) and transcatheter aortic valve implantation (TAVI)—in patients with a low risk for surgery. It found that while TAVI patients had higher rates of needing a permanent pacemaker (19% compared to 0%) and more severe leaks around the valve (18% compared to 4%), both procedures had similar rates of death and hospital readmissions over a follow-up of 4.5 years. This is important because it shows that both treatments are safe and effective options for patients, highlighting the importance of a medical team to help choose the best method for each individual. Who this helps: This helps patients with severe aortic stenosis and their doctors in making informed treatment decisions.

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This study looked at a rare type of foot injury involving a dislocation and fractures in a 58-year-old woman who fell down stairs. She suffered from a dislocated subtalar joint, along with fractures of the lateral malleolus and cuboid bones. After treatment, which included surgery and immobilization, she was able to regain 87% function, although there were signs of arthritis later on. Who this helps: This helps doctors understand and better treat complex foot injuries.

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This study looked at how often doctors use invasive tests to assess the heart's function in patients with coronary artery disease over a 12-year period involving over 40,800 procedures. Overall, these tests were rarely used, with only 0.6% for valve disease patients and 6% for stable coronary artery disease patients. This low adoption rate suggests that there is an opportunity to improve patient care by encouraging doctors to follow updated guidelines and use these assessments more frequently. Who this helps: This helps patients with coronary artery disease by promoting better diagnostic practices.

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This study focused on creating new textured surfaces for zirconia dental implants using laser technology to improve how well these implants bond with bone tissue. The researchers designed surfaces with different patterns and found that all of them were highly water-attracting, which is beneficial for integration with biological tissues. The study also showed that the laser texturing didn’t weaken the implant's overall strength, indicating that these innovative surfaces could enhance the effectiveness and longevity of zirconia implants. Who this helps: Patients needing dental implants.

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This study looked at how new tools were created and used in Portuguese healthcare to promote physical activity among patients. Over a two-year period, nearly 120,000 patients had their activity levels checked, and almost 8,000 received counseling on how to be more active. These efforts are important because they help encourage healthier lifestyles in the community and could lead to better overall health for citizens. Who this helps: Patients who want to improve their physical activity levels.

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This study looked at how inhaled nitric oxide (iNO) affects blood flow in patients with advanced heart failure who are being evaluated for heart transplantation. Researchers tested iNO on 108 patients, finding that it safely reduced resistance in the blood vessels of the lungs and slightly increased blood flow, with only a few cases (7.6%) showing an unexpected increase in resistance. These findings suggest that iNO can help doctors assess and manage patients with pulmonary hypertension during the evaluation process for heart transplant. Who this helps: This helps patients with advanced heart failure and their doctors.

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This study looked at how using a special laser to create patterns on zirconia dental implants affects the behavior of human bone cells. Researchers found that the laser-treated surfaces improved cell viability and proliferation after 7 and 14 days of culture compared to untreated implants, with significant increases in collagen production as well. However, the type of pattern, spacing, and number of laser passes did not make a difference in how the cells responded. Who this helps: This benefits dental implant patients and their doctors.

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This study looked at how amyotrophic lateral sclerosis (ALS) spreads in the body and how the involvement of two types of nerve cells, lower motor neurons (LMN) and upper motor neurons (UMN), affects that spread. Researchers analyzed data from 1,376 patients across five European centers and found that ALS typically spreads more quickly from the area where symptoms first appear to nearby areas. For instance, when ALS starts in the limbs, it tends to move down to the legs more rapidly than it does upwards to the face. Who this helps: This research benefits patients and doctors by improving understanding of ALS progression, which can inform treatment and care strategies.

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This study looked at the long-term survival of patients who received two types of heart stents: first-generation sirolimus-eluting stents (SES) and bare-metal stents (BMS). Over a 10-year period, the survival rate for those with SES was better, with only 22.7% dying compared to 27.5% for those with BMS, representing a 19.8% lower risk of death for SES patients. This is important because it shows that SES may provide a significant survival advantage over BMS in heart procedures. Who this helps: Patients undergoing coronary interventions.

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This study looked at the results of transcatheter aortic valve implantation (TAVI) in Portugal from 2007 to 2018, comparing two ways to access the heart: through the femoral artery (transfemoral) and other routes (non-transfemoral). Researchers found that 30-day mortality was lower for patients who had TAVI through the transfemoral route at 4.3%, compared to 10.1% for those using non-transfemoral access. At one year, the overall mortality rate was 11.4%, significantly better for transfemoral patients (10.5% vs. 19.4%), showing that the method of access affects both short-term and long-term survival. Who this helps: This benefits patients undergoing TAVI, particularly those with access to the transfemoral route.

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This study reports on a 73-year-old woman with severe heart failure who accidentally had a hole made in her heart (specifically, the left atrium) during a procedure to drain fluid. Researchers successfully closed this hole using a special plug device without needing surgery, which is important because surgery can be very risky for patients in critical condition. This breakthrough shows that less invasive options can be effective when traditional surgeries are too dangerous. Who this helps: Patients with serious heart conditions facing high surgical risks.

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This research looked at the disrespect and abuse women face during childbirth and abortion in Latin America, analyzing data from 18 studies. The findings showed that 39% of women experienced some form of disrespect or abuse; specifically, this was 43% during childbirth and 29% during abortion. This matters because these issues are serious human rights and public health concerns that need to be addressed to improve women's health outcomes and safety in healthcare settings. Who this helps: This benefits women undergoing childbirth and abortion, as well as healthcare providers who seek to improve the quality of care.