Articles tagged with Teeth
Researchers found that dancing with elk tooth ornaments creates similar wear marks on the teeth as those found in ancient Stone Age graves. The study used microanalysis to compare modern and ancient elk tooth wear marks, providing insight into the past's auditory experiences.
Researchers measured the bite force of juvenile Tyrannosaurus rex fossils, finding they could exert up to 5,641 newtons, between that of adult T. rexes and smaller dinosaurs. This discovery provides insight into how young T. rexes fed and interacted with their environment.
Researchers analyzed CT scans of nearly every living amphibian genus to reveal that frogs have lost teeth over 20 times during their evolution. The study found a correlation between the absence of teeth in frogs and a specialized diet on small insects.
A reevaluation of the Edaphodon eyrensis fossil tooth plate has led to a revised classification as Ptyktoptychion eyrensis. The discovery was made possible by Evgeny Popov's study of the fossil in various Australian locations.
Researchers discovered a rare iron mineral in the teeth of a large mollusk called chiton. The finding helps understand how the tooth is designed to endure chewing on rocks, and inspired the development of a bio-inspired ink for 3D printing.
Researchers develop therapeutic strategy to disrupt sticky biofilm that causes early childhood caries, a severe form of dental decay. The treatment targets the bonds between bacteria and yeast, reducing biofilm volume and making it easier to remove.
A new ancient shark species, Durnonovariaodus maiseyi, has been identified from a 150 million-year-old fossil found in the Kimmeridge Clay Formation of England. The discovery provides valuable insights into the evolution and diversity of hybodontiform sharks, which were closely related to modern sharks.
Researchers at Tel Aviv University have developed an active molecule (SNV) that can significantly suppress both inflammation and bone destruction around dental and orthopedic implants. The new technology has the potential to help people with implant failures, gum recession, or loose teeth due to periodontal disease.
The latest study reveals that vertebrate dentitions evolved independently, with complex tooth structures gaining and losing throughout evolution. This contradicts the long-held view of sharks reflecting ancestral conditions for tooth development.
A team of researchers has created the first-ever single-cell atlas of the human teeth, revealing cellular heterogeneity and stem cell populations with great regenerative potential. The study highlights the importance of microenvironmental specificity in functional differences between stem cells in various tooth compartments.
Researchers analyzed tooth remains from Middle Neolithic to Late Bronze Age populations in the Great Hungarian Plain, revealing less abrasive and processed foods during this period. The study combines stable isotope and dental microwear analyses, providing new data on ancestral diets.
An interdisciplinary team at Monash University discovered a new universal rule of biological growth that explains surprising similarities in the shapes of sharp structures across the tree of life. The 'power cascade' rule applies to various animals, including teeth, horns, claws, and even plant thorns, following a power law pattern.
A new study by Kyoto University scientists has shown an antibody for USAG-1 to stimulate tooth growth in mice with congenital tooth agenesis. The antibody, which targets the factor that antagonizes BMP and Wnt signaling, is promising for a potential therapeutic framework for regenerating teeth.
Scientists have found that odontoblasts, cells forming dentin beneath the enamel, sense cold and trigger pain. By blocking this function, researchers can inhibit dental pain and create novel applications for eugenol-based treatments.
Research reveals that teeth contain cold-sensitive proteins called odontoblasts, which detect temperature changes and trigger pain signals to the brain. This discovery explains how clove oil eases toothaches and may lead to new treatments for tooth sensitivity.
Scientists develop patented RNA-based therapy to degrade overexpressed PMP22 protein, restoring nerve function and strength in mice. The treatment uses biocompatible siRNA nanoparticles and controls particle size and injection amount.
A study by Kristiina Mannermaa analyzed over 4,000 elk tooth ornaments found in graves across Baltic and Scandinavian regions. The results showed that practically all teeth had been processed identically, with only two instances featuring perforation for threading.
Research reveals that Megalodon's unique tooth shape allowed it to withstand bite forces generated by its powerful lateral head movements. This challenges traditional assumptions about the evolution of the species' dentition.
Gorgonopsians, a lineage more related to humans than dinosaurs, evolved the first complex tooth serration made of enamel and dentine, discovered in a new Harvard-led study. This finding indicates that gorgonopsians developed this specialized structure early in amniote evolution.
A study published in Biology Letters reveals that ancient synapsids, such as gorgonopsians and Dimetrodon, shared serrated tooth structures with theropod dinosaurs. These findings suggest that convergent evolution led to similar adaptations in these distinct groups of predators.
Researchers at Tokyo Medical and Dental University have developed a cross-linker for dental cement that breaks down under UV light, making treatments easier to reverse. This breakthrough enables non-permanent adhesion to the tooth surface without damaging enamel.
Researchers used videoscope analysis to study the Neanderthal skeleton from Altamura, Italy, gaining detailed information about its dental structure. The findings provide valuable data on ancient human oral health and offer a unique perspective on Neanderthal biology.
A new study by UCF researchers found that people with congested noses and full sets of teeth are more likely to spread viruses like COVID-19. The study used computer-generated models to simulate sneezes in different types of people, finding that these features can increase the distance droplets travel and linger in the air.
Researchers found that Neanderthal children grew at a similar rate to modern humans, introducing solid foods around 5-6 months old, and were likely of similar weight to neonates. This suggests a possible shorter inter-birth interval and similar gestational history.
A tiny jaw from Greenland has revealed the earliest known example of dentary bone with two rows of cusps on molars and double-rooted teeth, offering insights into mammal tooth evolution. The discovery suggests that complex occlusion and double-rooted teeth developed together in early mammals.
Research on 200 million-year-old mammal teeth reveals they functioned like reptiles, living up to 14 years. Fossilized cementum rings were used to determine lifespan, contradicting previous warm-blooded mammal assumptions.
Researchers analyzed Kalaallitkigun jenkinsi, a late Triassic species from Greenland, to study the origin of double-row cusped molar-like teeth. The findings suggest that these features may have evolved together with biomechanically optimized dual roots.
A team of dentists from RUDN University presented a new classification system for root canal shape changes, which can vary depending on the tooth part and patient age. The study used CT scans of 300 patients and identified four groups of shape changes to help dentists choose proper tools and treatment methods.
Researchers at Karolinska Institutet have identified all cell populations in mouse teeth and young human teeth, deciphering differentiation pathways of odontoblasts and ameloblasts. The study sheds light on tooth sensitivity and the formation of enamel.
Researchers at Clemson University have identified two genetic variations associated with small body size and lance canine, a dental anomaly common in Shetland Sheepdogs. The study found that dogs with these variations are on average one inch shorter and six pounds lighter than unaffected breeds.
A 48,000-year-old milk-tooth found in Veneto, Italy, is confirmed to belong to a child Neanderthal, providing valuable insights into human evolution. The study's findings suggest that Neanderthals were present in the area until around 45,000 years ago.
The study reveals the oldest mitochondrial genome of a Neanderthal found in Central-Eastern Europe, dating back ~80,000 years. Genetic analysis shows a strong connection between Poland and the Northern Caucasus, shedding light on Neanderthals' adaptability and biology.
A 13-million-year-old fossil unearthed in northern India belongs to a previously unknown genus and species, providing new evidence about the migration of great apes and lesser apes from Africa to Asia. The discovery pushes back the oldest known fossil record of gibbons by at least five million years.
A new study led by Swansea University and the University of Bristol has revealed the size of Megalodon, including its massive fins. The shark's estimated body length is 16 meters, with a head diameter of 4.65 meters.
Paleontologists found that different types of mineral dust cause distinct signs of wear on plant-eating vertebrates' teeth. Larger quartz particles caused severe abrasion, while small particles generated smooth surfaces. This study improves diet reconstruction accuracy using fossil teeth analysis.
A recent study from Okayama University found that bacteria from families Prevotellaceae and Veillonellaceae, as well as genera Alloprevotella and Dialister, may contribute to dental caries. This suggests a shift in research focus away from mutans streptococci.
Researchers are conducting a large-scale study to understand the biological factors driving tooth decay in preschool-aged children in Yuma, Ariz., and on the island of Hawai'i. The study aims to discover interventions to eliminate bacteria contributing to childhood tooth decay.
Researchers have developed a new type of cerium nanoparticle formulation that can prevent plaque and cavities from forming, without killing oral bacteria. The nanoparticles inhibit the growth of biofilms by 40% compared to silver nitrate, reducing the risk of tooth decay.
A study of 8,275 participants found that those with severe gum disease had twice the risk for mild cognitive impairment or dementia. People with minimal tooth loss and mild gum disease were no more likely to develop thinking problems than those with no dental issues.
KAIST researchers used AFM to analyze the effects of acidic and sugary drinks on human tooth enamel at the nanoscale level. The study found significant increases in surface roughness and decreases in elastic modulus with immersion time, highlighting the need for thorough studies on early-stage enamel erosion.
A collaboration between Cornell and Northwestern universities has exposed tiny chemical flaws in human enamel using atomic imaging techniques. The findings suggest that irregularities in the enamel's structure may play a role in reinforcing it, making it more resilient to decay.
A study published in the journal Gut found that people with periodontal disease may be at a higher risk of developing oesophageal and gastric cancer. The research examined data from over 98,000 women and men and found a 43-52% increased risk associated with periodontal disease.
A study using chemical analysis reveals that the Hyksos rulers of Ancient Egypt were a multi-cultural group who rose to power from within. The research found that a large percentage of the population in the ancient capital city were non-locals who immigrated from various places, contradicting the common story of a sudden invasion.
Researchers use advanced X-ray technology to study ancient fish fossils, revealing modern features and challenging previous assumptions about tooth evolution. The findings suggest that the ancestors of modern vertebrates retained a common dental structure, with new teeth added on the inside, contrary to long-held perceptions.
Researchers used synchrotron microtomography to visualize ancient fossils and found that acanthothoracid teeth were attached to jaw-bones like modern fish and land animals. This discovery challenges the common perception that sharks are primitive living vertebrates.
Materials scientists at Northwestern University have discovered a small number of impurity atoms that contribute to the strength but also make human enamel more soluble. The study, using atomic-scale resolution, sheds light on the spatial distribution of these impurities in the enamel's core-shell structure.
A NIH-funded study has revealed unprecedented atomic details of human tooth enamel structure and composition, including the presence of minor elements such as magnesium and sodium. The findings suggest that these irregularities may introduce areas of strain in the crystallite, potentially making enamel stronger overall.
A study led by University College London found that elite athletes who adopted simple oral health measures reported reduced negative effects on performance related to poor oral health. The behaviour change programme improved oral health behaviours and reduced symptoms of gum inflammation, leading to improved sporting performance.
A team from the University of Pennsylvania and Georgia Tech discovered that cavity-causing bacteria, Streptococcus mutans, are encased in a protective community of other microbes forming a unique spatial organization. This structure is crucial to how they cause tooth decay and can be used to target the pathogenic core of dental biofilms.
The study reveals a rotund organization of concentric layers of different bacteria in a corona-like structure, with Streptococcus mutans at the center. This structure creates an acidic microenvironment that causes enamel dissolution and the onset of caries.
A new study reveals that the Late Cretaceous reptile Priosphenodon had a unique type of tooth enamel, similar to that of mammals, which provided it with resilience against tooth wear. The researchers found that the enamel crystals in Priosphenodon were 'woven' into long threads called enamel prisms, a characteristic also found in mammals.
Researchers analyze fossil teeth from Timor and Alor islands to study ecological adaptations of earliest Homo sapiens. The study shows that humans relied on coastal resources initially, but then adapted to tropical forest environments around 20,000 years ago.
Researchers examined the oral mycobiome, discovering 139 species of fungi that live in human dental plaque, with nine strongly associated with healthy teeth. These beneficial fungi may produce compounds like xylitol, which inhibits cavity-causing bacteria.
A new study published in Scientific Reports found that teeth contain annual layers, or cementum bands, that record an individual's life experiences, including reproduction and menopause. The research uses microscopic examination to reveal connections between tooth formation and other life stages.
Scientists at King's College London have found positive evidence that a natural tooth repair method has the potential to be translated into a clinical approach. The study discovered that reparative dentine produced is sufficient to repair cavities in human teeth, and the drug can activate repair up to ten times larger.
A study published in Diabetologia found that frequent tooth brushing is linked to a lower risk of developing diabetes, with an 8% reduced risk for those brushing three times a day or more. In contrast, dental disease and missing teeth are associated with a higher risk of diabetes, with increases of 9% and 21% respectively.
Researchers at NYU College of Dentistry discovered that excessive fluoride causes dental fluorosis by altering calcium signaling, mitochondrial function, and gene expression in tooth enamel cells. This understanding provides a promising mechanistic view of how fluorosis arises.
A new study by West Virginia University researchers links higher concentrations of perfluorodecanoic acid in children's blood to increased tooth decay rates. The chemical, found in some drinking water systems, may disrupt the healthy development of enamel, making teeth more susceptible to cavities.
A new skeleton discovered in Tulum's submerged caves provides evidence for an early settlement of the Yucatán Peninsula, Mexico. The Chan Hol 3 skeleton, found to be approximately 30 years old and a woman, has a distinctive skull shape that contrasts with other American crania from a similar age range.
Researchers developed a method to evaluate ancient human geographic origins using lead isotopes from tooth enamel, which showed consistency with local prehistoric animals. The study suggests that at least five individuals were from southwest Arkansas, providing new insights into the Caddo Indian burial practice.