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https://www.readbyqxmd.com/read/28930642/microbial-complexes-and-caries-in-17-year-olds-with-and-without-streptococcus-mutans
#1
L Eriksson, P Lif Holgerson, A Esberg, I Johansson
Streptococcus mutans is a key bacterial species in the caries process, which affects >90% of the population worldwide. However, other acidogenic and aciduric/acidophilic species may contribute to disease development. In Sweden, a country with low prevalences of caries and S. mutans, a significant portion of caries-affected adolescents lack detectable levels of S. mutans. The objectives of the present study were 1) to characterize the tooth biofilm and saliva microbiota of adolescents with caries disease, with or without detectable S...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28930602/molecular-biology-of-tick-acetylcholinesterases
#2
Kevin Bruce Temeyer
Ticks vector many pathogens with major health and economic impacts and have developed resistance to most acaricides used for tick control. Organophosphate (OP) acaricides target acetylcholinesterase (AChE) critical to tick central nervous system function. Mutations producing tick AChEs resistant to OPs were characterized; but tick OP-resistance is not fully elucidated, due to remarkable complexity of tick cholinergic systems. Three paralogous tick AChEs exhibiting differences in primary structure and biochemical kinetics are encoded by amplified genes with developmentally regulated expression...
January 1, 2018: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28930546/tick-host-pathogen-systems-immunobiology-an-interactive-trio
#3
Stephen K Wikel
Significant new insights are being made into tick modulation of host immune defenses and the implications of those host defense changes on tick-borne pathogen transmission and establishment of infection. Understanding tick saliva complexity increased with construction and analyses of salivary gland cDNA libraries. High throughput next generation sequencing and advances in proteomics are revealing greater complexity of saliva, nature of gene families and differential gene expression patterns not previously attainable...
January 1, 2018: Frontiers in Bioscience (Landmark Edition)
https://www.readbyqxmd.com/read/28929995/endocrinological-and-subjective-stress-responses-in-children-with-depressive-anxiety-or-externalizing-disorders
#4
Stephanie Stadelmann, Sonia Jaeger, Tina Matuschek, Yoon Ju Bae, Kai von Klitzing, Annette Maria Klein, Mirko Döhnert
In this study, we used a stress test to investigate endocrinological and subjective stress responses of 8- to 14-year-old children with internalizing or externalizing disorders and healthy controls. The sample (N = 170) consisted of clinical and community children. Parents were given a diagnostic interview to diagnose their children's psychiatric condition. We measured saliva cortisol and subjectively experienced arousal in children before and after the Trier Social Stress Test for Children. Children also rated their performance immediately after the stress test, and 1 hr later they rated their positive and negative thoughts about this stressful event...
September 20, 2017: Development and Psychopathology
https://www.readbyqxmd.com/read/28928784/association-of-stress-salivary-cortisol-level-and-periodontitis-among-the-inmates-of-a-central-prison-in-kerala
#5
Angel Fenol, Susan Jebi, Sajitha Krishnan, Jayachandran Perayil, Rajesh Vyloppillil, Anuradha Bhaskar, Sai Megha Menon, Ashitha Mohandas
BACKGROUND: The aim of this cross-sectional study was to evaluate the association between stress, salivary cortisol, and periodontitis among the inmates of the central prison. MATERIALS AND METHODS: Seventy inmates were grouped depending on their pocket depth into Group A (pocket depth >4 mm and <6 mm), Group B (at least four sites with pocket depth ≥6 mm), and Group C (pocket depth ≤3 mm). The clinical parameters such as the oral hygiene index-simplified, gingival index, pocket depth, and the clinical attachment levels (CALs) were recorded...
July 2017: Dental Research Journal
https://www.readbyqxmd.com/read/28928781/n-acetylneuraminic-acid-a-scrutinizing-tool-in-oral-squamous-cell-carcinoma-diagnosis
#6
Suganya Rajaram, Balamurali P Danasekaran, Ramesh Venkatachalapathy, Karthikshree Vishnu Prashad, Saranya Rajaram
BACKGROUND: Oral cancer has one of the highest mortality rate among other malignancies. An attempt has been made to assess the genetic expression of a cell surface glycoprotein component - sialic acid released by the malignant cells which will reflect on the oral squamous cell carcinoma (OSCC). The aim of this study was to estimate and correlate the salivary and serum sialic acid levels in OSCC. MATERIALS AND METHODS: In our case-control study, saliva and blood samples were obtained from Group 1 - 10 healthy controls, Group 2 - 12 well-differentiated OSCC, Group 3 - 7 moderately differentiated and 2 poorly differentiated OSCC...
July 2017: Dental Research Journal
https://www.readbyqxmd.com/read/28928780/assessment-of-oral-health-parameters-among-students-attending-special-schools-of-mangalore-city
#7
Tom Peter, Deepthi Anna Cherian, Tim Peter
BACKGROUND: The aim of the study was to assess the oral health status and treatment needs and correlation between dental caries susceptibility and salivary pH, buffering capacity and total antioxidant capacity among students attending special schools of Mangalore city. MATERIALS AND METHODS: In this study 361 subjects in the age range of 12-18 years were divided into normal (n = 84), physically challenged (n = 68), and mentally challenged (n = 209) groups. Their oral health status and treatment needs were recorded using the modified WHO oral health assessment proforma...
July 2017: Dental Research Journal
https://www.readbyqxmd.com/read/28928777/determination-of-salivary-urea-and-uric-acid-of-patients-with-halitosis
#8
Faezeh Khozeimeh, Nakisa Torabinia, Shirin Shahnaseri, Hooman Shafaee, Seyed Amir Mousavi
BACKGROUND: Halitosis is the presence of unpleasant or foul smelling breath. The origin of halitosis may be related to both systemic and oral conditions, but a large percentage of cases, about 90%, is generally related to an oral cause. The aim of this study was to compare the concentration of urea and uric acid in patients with halitosis and people without halitosis. MATERIALS AND METHODS: In this case-control study, concentration of urea and uric acid was compared between two groups: (1) persons suffering halitosis (2) control group without halitosis...
July 2017: Dental Research Journal
https://www.readbyqxmd.com/read/28928228/salivary-%C3%AE-amylase-in-on-call-from-home-fire-and-emergency-service-personnel
#9
Sarah Janet Hall, Brad Aisbett, Sam J Robertson, Sally A Ferguson, Anne Turner
The effect of working on-call from home on sympatho-adrenal medullary (SAM) system activity is currently unknown. This study had two aims, Aim 1: examine salivary α-amylase awakening response (AAR) and diurnal salivary α-amylase (sAA) profile in fire and emergency service workers who operate on-call from home following a night on-call with a call (NIGHT-CALL), a night on-call without a call (NO-CALL) and an off-call night (OFF-CALL) and, Aim 2: explore whether there was an anticipatory effect of working on-call from home (ON) compared to when off-call (OFF) on the diurnal sAA profile...
September 19, 2017: Endocrine Connections
https://www.readbyqxmd.com/read/28927459/microarchitecture-of-the-tsetse-fly-proboscis
#10
Wendy Gibson, Lori Peacock, Rachel Hutchinson
BACKGROUND: Tsetse flies (genus Glossina) are large blood-sucking dipteran flies that are important as vectors of human and animal trypanosomiasis in sub-Saharan Africa. Tsetse anatomy has been well described, including detailed accounts of the functional anatomy of the proboscis for piercing host skin and sucking up blood. The proboscis also serves as the developmental site for the infective metacyclic stages of several species of pathogenic livestock trypanosomes that are inoculated into the host with fly saliva...
September 19, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28927320/stress-and-cortisol-responses-in-men-differences-according-to-facial-symmetry
#11
Javier I Borráz-León, Ana Lilia Cerda-Molina, Lilian Mayagoitia-Novales
Stress response is associated with increased activity in the hypothalamic-pituitary-adrenocortical axis. Chronic stress-induced elevation in cortisol may alter its own negative regulation with multiple long-term consequences for physical and psychological health. One of the most reliable physical traits associated with mental, apparent physical health, and competitiveness is the degree of facial fluctuating asymmetry. However, to our knowledge there are no studies regarding the relationship between cortisol levels, facial symmetry and male competitiveness, and how cortisol changes after a stressful test depending on these traits...
September 19, 2017: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/28925491/corrosion-behavior-of-dental-implants-immersed-into-human-saliva-preliminary-results-of-an-in-vitro-study
#12
M Barbieri, F Mencio, P Papi, D Rosella, S Di Carlo, T Valente, G Pompa
OBJECTIVE: Over the years, different implant surfaces have been used to try to maximize bone to implant contact. The aim of this study was to compare levels of metallic ions and particles dissolution collected from two different dental implants surfaces immersed into human saliva. PATIENTS AND METHODS: A total of 60 dental implants were tested. Group A: sanded with aluminium oxide medium grade particles and acid-etched; Group B: micro-sanded with calcium phosphate powders and acid-etched...
August 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28924986/supplementing-electronic-health-records-through-sample-collection-and-patient-diaries-a-study-set-within-a-primary-care-research-database
#13
Rebecca M Joseph, Jamie Soames, Mark Wright, Kirin Sultana, Tjeerd P van Staa, William G Dixon
PURPOSE: To describe a novel observational study that supplemented primary care electronic health record (EHR) data with sample collection and patient diaries. METHODS: The study was set in primary care in England. A list of 3974 potentially eligible patients was compiled using data from the Clinical Practice Research Datalink. Interested general practices opted into the study then confirmed patient suitability and sent out postal invitations. Participants completed a drug-use diary and provided saliva samples to the research team to combine with EHR data...
September 19, 2017: Pharmacoepidemiology and Drug Safety
https://www.readbyqxmd.com/read/28922616/novel-testing-for-corrosion-of-glass-ceramics-for-dental-applications
#14
J F Esquivel-Upshaw, F Ren, S M Hsu, F Y Dieng, D Neal, A E Clark
The effects of pH cycling immersion on the corrosion of glass-based ceramic materials were investigated by examining the silicon release level in the immersion solution and the surface morphology of the ceramic after immersion. The hypothesis that pH cycling causes more surface degradation than constant immersion was tested. An inductively coupled plasma atomic emission spectrometer was used for Si ion concentration determination and scanning electron microscopy for surface morphology analyses. Two pH cycling sequences (pH 2, 7, 10 and pH 10, 2, 7) were employed in this study...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28922514/the-complexity-of-oral-physiology-and-its-impact-on-salivary-diagnostics
#15
Eva J Helmerhorst, Colin Dawes, Frank G Oppenheim
OBJECTIVES: Saliva contains biomarkers for systemic as well as oral diseases. This study was undertaken to assess the variability in the sources of such biomarkers (plasma, cells), and attempted to identify saliva deterioration markers in order to improve saliva diagnostic outcomes. MATERIALS AND METHODS: Inter- and intra-subject variation in salivary gingival crevicular fluid levels were determined by measuring salivary albumin and transferrin levels. The purity of collected glandular secretions was determined by bacterial culture, and the variability in epithelial cell numbers by cell counting and optical density measurement...
September 18, 2017: Oral Diseases
https://www.readbyqxmd.com/read/28922459/therapeutic-plasma-exchange-in-the-treatment-of-complicated-plasmodium-falciparum-malaria-a-case-report
#16
Tsong-Yih Ou, Cheng-Yen Chuang, Chun-Da Chen, Chung-Yi Cheng
Severe falciparum malaria is associated with multiple organ dysfunction and a high rate of fatal outcome. Malaria is a world-wide disease in tropical areas through the bites of vector mosquitoes. Parasitic protozoans introduced by the mosquito's saliva to the blood travel to the liver then mature and reproduce. In humans, malaria is caused by Plasmodium falciparum, P. malariae, P. ovale, P. vivax, and P. knowlesi, and P. falciparum causes most deaths. Typical malaria symptoms include fever, chills, fatigue, headache, nausea, and vomiting...
September 18, 2017: Journal of Clinical Apheresis
https://www.readbyqxmd.com/read/28922328/minor-salivary-gland-transplantation-for-severe-dry-eyes
#17
Tais Hitomi Wakamatsu, Ana Estela Besteti Pires Ponce SantʼAnna, Priscila Cardoso Cristovam, Venâncio Avancini Ferreira Alves, Alda Wakamatsu, José Alvaro Pereira Gomes
Dry eye is a multifactorial disease comprising a wide spectrum of ocular surface alterations and symptoms of discomfort. In most patients with aqueous-deficient dry eye, pharmaceutical tear substitutes are used to control symptoms and prevent ocular surface damage. However, in severe dry eye conditions caused by cicatricial disorders, such as Stevens-Johnson syndrome and ocular cicatricial mucous membrane pemphigoid, noninvasive treatments are insufficient, and patients are at risk of developing complications that can lead to blindness...
September 15, 2017: Cornea
https://www.readbyqxmd.com/read/28921685/four-year-incidence-rate-and-predictors-of-root-caries-among-community-dwelling-south-brazilian-older-adults
#18
Augusto B Bidinotto, Aline B Martins, Camila M Dos Santos, Fernando N Hugo, Juliana B Hilgert, Roger Keller Celeste, Dalva Maria Padilha, Renato José De Marchi
OBJECTIVE: This study aimed to assess the incidence density (ID) of new root caries lesions and restorations among community-living south Brazilian older adults and to assess its association with predictor variables. METHODS: We conducted a prospective cohort with a random sample of elders from the municipality of Carlos Barbosa, in south Brazil. Trained dentists performed interviews and oral examinations in 388 individuals at baseline, of which 273 were retained at follow-up 4 years later...
September 18, 2017: Community Dentistry and Oral Epidemiology
https://www.readbyqxmd.com/read/28921547/a-clinical-randomized-study-on-the-influence-of-dental-whitening-on-streptococcus-mutans-population
#19
André Luiz Fraga Briso, Úrsula Aparecida Escalero Silva, Morganna Borges de Almeida Souza, Vanessa Rahal, Elerson Gaetti Jardim Júnior, Luciano Tavares Angelo Cintra
Dental whitening with peroxides has been popularized through the at-home technique, which employs low concentrations of peroxide applied on individual trays. However, there are few clinical trials reporting the effects of its continuous use on oral microbiota. Thus, the purpose of the present clinical, randomized study was to evaluate the influence of at-home whitening treatment on Streptococcus mutans in saliva, buccal mucosa, and subgingival and supragingival plaque. Thirty volunteers were randomly divided into 2 study groups (n=15) according to the whitening therapy: G CP- whitening using 10% carbamide peroxide 4 hours daily for 21 days and G HP- whitening using 6% hydrogen peroxide 1...
September 16, 2017: Australian Dental Journal
https://www.readbyqxmd.com/read/28920437/real-time-metabolic-interactions-between-two-bacterial-species-using-a-carbon-based-ph-microsensor-as-a-scanning-electrochemical-microscopy-secm-probe
#20
Vrushali Subhash Joshi, Partha Sarathi Sheet, Nyssa Cullin, Jens Kreth, Dipankar Koley
We have developed a carbon-based, fast-response potentiometric pH microsensor for use as a scanning electrochemical microscopy (SECM) chemical probe to quantitatively map the microbial metabolic exchange between two bacterial species, commensal Streptococcus gordonii and pathogenic Streptococcus mutans. The 25-μm diameter H+ ion-selective microelectrode or pH microprobe showed a Nernstian slope of 59 mV/pH and high selectivity against major ions such Na+, K+, Ca2+ and Mg2+. In addition, the unique conductive membrane composition aided us in performing an amperometric approach curve to position the probe and obtain a high-resolution pH map of the microenvironment produced by the lactate-producing S...
September 18, 2017: Analytical Chemistry
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