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1.
JAMA Netw Open ; 6(9): e2333367, 2023 09 05.
Artículo en Inglés | MEDLINE | ID: mdl-37698864

RESUMEN

This cross-sectional study investigates rates of dental problems among Medicare beneficiaries in nursing homes and characteristics associated with these rates.


Asunto(s)
Medicare , Salud Bucal , Anciano , Estados Unidos , Humanos , Casas de Salud
2.
J Public Health Dent ; 81(1): 77-83, 2021 12.
Artículo en Inglés | MEDLINE | ID: mdl-33135181

RESUMEN

Oral health is often excluded from broad health policy discussions, addressed only in a policy silo. There is a paucity of research to guide policymaking as it relates to oral health. In response, AcademyHealth's Oral Health Interest Group organized a meeting during the 2019 AcademyHealth Annual Research Meeting to promote transdisciplinary dialog on the current state of oral health policy and the steps necessary to improve the oral health of Americans. This article summarizes the two main themes that emerged from the proceedings of the Oral Health Interest Group meeting: a) recommendations for advocating the inclusion of oral health in policy discussions and b) critical research topics and measures needed for effective oral health policies in the future.


Asunto(s)
Política de Salud , Salud Bucal , Humanos , Formulación de Políticas
3.
J Am Dent Assoc ; 151(3): 174-181.e1, 2020 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-31959329

RESUMEN

BACKGROUND: Patients visiting the emergency department (ED) for nontraumatic dental conditions usually receive nondefinitive health care and are referred to treatment elsewhere. This may lead to potentially avoidable antibiotic and opioid use. METHODS: A retrospective study was conducted in IBM MarketScan Research Databases in Treatment Pathways from 2012 through 2014. This study included patients with commercial insurance or enrolled in Medicaid. Patients receiving a diagnosis of a dental condition in the ED with no secondary diagnosis warranting an antibiotic prescription were included. Patients were stratified on the basis of the primary payer and available demographics, as well as on the basis of repeat visits to the ED. RESULTS: A higher proportion of Medicaid beneficiaries (280,410, 4.9%) had dental-related visits compared with the commercially insured (159,066, 1.3%). The most common diagnoses were similar for both groups and included caries. In both cohorts, the 18- through 34-year age group had the highest rate of dental-related ED visits. Within 7 days of a dental-related ED visit, 54.9% of Medicaid beneficiaries and 55.0% of commercially insured beneficiaries filled a prescription for an antibiotic and 39.6% of Medicaid patients and 42.0% of commercially insured patients filled an opioid prescription. CONCLUSIONS: Antibiotics and opioids are frequently prescribed during ED visits for dental conditions. Access to preventive and acute oral health care for routine dental symptoms, such as caries, may reduce unnecessary prescriptions in both the commercially insured and Medicaid beneficiary populations. PRACTICAL IMPLICATIONS: Treatment of dental conditions in the ED often indicates a lack of access to preventive or acute oral health care. Data-driven solutions, such as guideline implementation, could improve oral health access, reduce medication-related harms, and avert health care expenditures.


Asunto(s)
Analgésicos Opioides , Antibacterianos , Servicio de Urgencia en Hospital , Humanos , Medicaid , Pautas de la Práctica en Medicina , Estudios Retrospectivos , Estados Unidos
4.
J Am Dent Assoc ; 150(10): e135-e144, 2019 10.
Artículo en Inglés | MEDLINE | ID: mdl-31561765

RESUMEN

BACKGROUND: The objective of this study was to identify specific factors (sex, race or ethnicity, and health care provider type) associated with patient receipt of an opioid prescription after a dental diagnosis. METHODS: The authors used Medicaid claims dated from January 1, 2013, through September 30, 2015, for 13 U.S. states in this study. The authors identified oral health-related conditions by using International Classification of Diseases, Ninth Revision, Clinical Modification diagnosis codes 520.0 through 529.9. RESULTS: During the 2013 through 2015 study period, among the more than 1,008,400 Medicaid patients with a dental diagnosis, 19.8% filled an opioid prescription within 14 days of diagnosis. Female patients were 50% more likely to receive an opioid prescription for pain management of a dental condition than were men (odds ratio [OR], 1.50; 95% confidence interval [CI], 1.49 to 1.52). Non-Hispanic whites and African Americans were approximately twice as likely to receive opioids than were Hispanics (OR, 2.12; 95% CI, 2.05 to 2.19; OR, 1.90; 95% CI, 1.84 to 1.96, respectively). Patients receiving oral health care in an emergency department were more than 7 times more likely to receive an opioid prescription than were patients treated in a dental office (OR, 7.28; 95% CI, 7.13 to 7.43). Patients with a dental condition diagnosed were more than 4 times as likely to receive an opioid from a nurse practitioner as from a dentist (OR, 4.31; 95% CI, 4.19 to 4.44). Opioid use was substantially higher among African American female patients (OR, 2.02; 95% CI, 1.93 to 2.10) and non-Hispanic white female patients (OR, 2.16; 95% CI, 2.07 to 2.24) than among Hispanic female patients. CONCLUSIONS: Opioid prescribing patterns differ depending on patient race or ethnicity, sex, and health care provider source in patients with a dental diagnosis in the United States. PRACTICAL IMPLICATIONS: Dentists are providing substantially fewer opioid prescriptions compared with their medical colleagues for pain treatment after a dental diagnosis in the Medicaid population. When considering pain management for dental and related conditions, dentists should continue with conservative prescribing practices as recommended.

5.
Am J Prev Med ; 57(3): 365-373, 2019 09.
Artículo en Inglés | MEDLINE | ID: mdl-31377093

RESUMEN

INTRODUCTION: Millions of Americans are affected by acute or chronic pain every year. This study investigates opioid prescription patterns for acute and chronic pain management among U.S. Medicaid patients. METHODS: The study used medical and pharmacy claims data obtained from the multistate Truven MarketScan Medicaid Database from 2013 to 2015 for Medicaid patients receiving health care. Medicaid beneficiaries who utilized an outpatient healthcare facility for back pain, neck pain (cervicalgia), joint pain (osteoarthritis and rheumatoid arthritis), orthopedics (simple/closed fractures and muscle strains/sprains), headache (cluster headaches and migraines), dental conditions, or otorhinolaryngologic (otalgia) diagnoses, based on the International Classification of Diseases, Ninth Revision, Clinical Modification diagnosis codes, and received an opioid prescription within 14 days of diagnosis were included in this study. RESULTS: There were 5,051,288 patients with 1 of the 7 diagnostic groupings; 18.8% had an opioid prescription filled within 14 days of diagnosis. Orthopedic pain (34.8%) was the primary reason for an opioid prescription, followed by dental conditions (17.3%), back pain (14.0%), and headache (12.9%). Patients receiving an opioid for conditions associated with acute pain management, such as otorhinolaryngologic (OR=1.93, 95% CI=1.85, 2.0), dental (OR=1.50, 95% CI=1.48, 1.53), or orthopedic conditions (OR=1.31, 95% CI=1.29, 1.32), were more likely to receive the prescription from an emergency department provider versus a general practitioner. However, compared with general practitioners, other providers were more likely to prescribe opioids for conditions associated with chronic pain management. CONCLUSIONS: More than half of Medicaid beneficiaries receiving an opioid for pain management do so for orthopedic- and dental-related reasons, with emergency department providers more likely to prescribe opioids. Modifications to the guidelines addressing temporary acute pain management practices with opioids would be likely to benefit emergency department providers the most.


Asunto(s)
Dolor Agudo/tratamiento farmacológico , Analgésicos Opioides/uso terapéutico , Dolor Crónico/tratamiento farmacológico , Medicaid/estadística & datos numéricos , Pautas de la Práctica en Medicina/estadística & datos numéricos , Adolescente , Adulto , Anciano , Prescripciones de Medicamentos/normas , Prescripciones de Medicamentos/estadística & datos numéricos , Servicio de Urgencia en Hospital/normas , Servicio de Urgencia en Hospital/estadística & datos numéricos , Femenino , Humanos , Masculino , Persona de Mediana Edad , Epidemia de Opioides/prevención & control , Manejo del Dolor/efectos adversos , Manejo del Dolor/normas , Manejo del Dolor/estadística & datos numéricos , Guías de Práctica Clínica como Asunto , Pautas de la Práctica en Medicina/normas , Mal Uso de Medicamentos de Venta con Receta/prevención & control , Estados Unidos/epidemiología , Adulto Joven
6.
BMC Oral Health ; 18(1): 198, 2018 11 29.
Artículo en Inglés | MEDLINE | ID: mdl-30497465

RESUMEN

BACKGROUND: To achieve optimal health and oral health, the system of care must place a person and their social well-being at the center of decision making and understand factors spent outside the clinical settings, including individual behavior, context and lifestyle. MAIN TEXT: Person-centered care offers a unique and compelling opportunity for dentistry, and its practitioners, to improve quality of care and overall health outcomes. For decades, the dominant treatment modalities within dentistry primarily focused on a surgical, treatment-oriented approach as opposed to health promotion and improvement. However, new business and care models are disrupting the dental care system, and transforming it into one that is focused on disease management and prevention-oriented primary care that considers overall health and well-being. We proposed a person-centered care model to improve oral health as an integral part of overall health. The model identified three key players who act as change agents with their respective roles and responsibilities: Person, provider, and health care system designer. CONCLUSIONS: While previous person-centered models in dentistry focused on the role of providers within the clinical setting, this work emphasizes the role of the care designer in creating an environment where both person and provider are able to communicate effectively and achieve improved health outcomes.


Asunto(s)
Odontología/métodos , Salud Bucal , Atención Dirigida al Paciente , Adulto , Disparidades en el Estado de Salud , Humanos , Estados Unidos
7.
J Am Dent Assoc ; 149(4): 246-255, 2018 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-29599018

RESUMEN

BACKGROUND: The objective of this study was to identify specific factors (sex, race or ethnicity, and health care provider type) associated with patient receipt of an opioid prescription after a dental diagnosis. METHODS: The authors used Medicaid claims dated from January 1, 2013, through September 30, 2015, for 13 US states in this study. The authors identified oral health-related conditions by using International Classification of Diseases, Ninth Revision, Clinical Modification diagnosis codes 520.0 through 529.9. RESULTS: During the 2013-2015 study period, among the more than 890,000 Medicaid patients with a dental diagnosis, 23% received an opioid within 14 days of diagnosis. Female patients were 50% more likely to receive an opioid for pain management of a dental condition than were men (odds ratio [OR], 1.53; 95% confidence interval [CI], 1.52 to 1.55). Non-Hispanic whites and African Americans were approximately twice as likely to receive opioids than were Hispanics (OR, 2.11; 95% CI, 2.05 to 2.17 and OR, 1.88; 95% CI, 1.83 to 1.93, respectively). Patients receiving oral health care in an emergency department were nearly 5 times more likely to receive an opioid prescription than were patients treated in a dental office (OR, 4.66; 95% CI, 4.59 to 4.74). Patients with a dental condition diagnosed were nearly 3 times as likely to receive an opioid from a nurse practitioner as from a dentist (OR, 2.64; 95% CI, 2.57 to 2.70). Opioid use was substantially higher among African American female patients (OR, 3.29; 95% CI, 3.18 to 3.40) and non-Hispanic white female patients (OR, 3.24; 95% CI, 3.14 to 3.35) than among Hispanic female patients. CONCLUSIONS: Opioid prescribing patterns differ depending on patient race or ethnicity, sex, and health care provider source in patients with a dental diagnosis in the United States. PRACTICAL IMPLICATIONS: Dentists are providing substantially less opioid prescriptions compared to their medical colleagues for pain treatment following a dental diagnosis in the Medicaid population. When considering pain management for dental and related conditions, dentists should continue with conservative prescribing practices as recommended.


Asunto(s)
Analgésicos Opioides , Medicaid , Etnicidad , Femenino , Humanos , Masculino , Manejo del Dolor , Pautas de la Práctica en Medicina , Estados Unidos
8.
Dent Clin North Am ; 62(2): 295-317.e12, 2018 04.
Artículo en Inglés | MEDLINE | ID: mdl-29478459

RESUMEN

This article explores trends in 3 areas of dental services use for children less than 21 years of age. First, it examines the change in access to prevention, diagnostic, and treatment services over time among Medicaid-enrolled children and how access to care is affected by state-level factors. Second, it evaluates trends and health care costs associated with the treatment of oral health conditions in the operating room of pediatric hospitals. Third, it examines the trends in use of emergency departments for dental needs among children in the United States.


Asunto(s)
Atención Dental para Niños/estadística & datos numéricos , Adolescente , Factores de Edad , Niño , Preescolar , Accesibilidad a los Servicios de Salud/estadística & datos numéricos , Humanos , Lactante , Recién Nacido , Medicaid/estadística & datos numéricos , Aceptación de la Atención de Salud/estadística & datos numéricos , Estados Unidos , Adulto Joven
9.
Front Public Health ; 5: 164, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-28770189

RESUMEN

OBJECTIVES: Hospital emergency departments (EDs) are a place where many Americans seek treatment of dental conditions. Racial and ethnic minorities consistently have higher rates of ED utilization than whites for dental conditions. The reasons for these disparities and significant public health concerns are investigated less often. In this paper, we measure trends in racial disparities in ED discharges for dental conditions in Maryland from 2010 to 2013. To understand these disparities, we also describe differences between racial groups in age, gender, income, location, payer, comorbidities, and the availability of dental care. METHODS: 2010-2013 State Emergency Department Data for Maryland were used in the analysis. Rates per 100,000 of the population are calculated using information from census population estimates. Cost-to-charge ratios are used to estimate the costs of ED discharges. Dental/oral health-related conditions (DOHRC) are defined as discharge diagnoses of ICD-9-CM codes 520.0 through 529.9. Descriptive statistics and fixed effects logistic regression models with a rare event correction are used to analyze the data. RESULTS: Blacks, especially females aged 25-34, have larger proportions of total ED discharges due to DOHRC, and higher population rates of DOHRC, than any other racial or ethnic group. In 2013, Blacks represented 30% of Maryland's population and accounted for 52% of ED costs for DOHRC. Hispanics and those of other races have much lower rates of DOHRC discharges. The regression results show that the high proportion of DOHRC discharges among Blacks may be explained by the concentration of Blacks in low-income central cities with less access to dental care. CONCLUSION: There are significant racial disparities in the ED utilization for DOHRC in Maryland. These disparities reflect the lack of access to dental care due to both cost and geographic limitations. This results in high healthcare costs and ineffective solutions for patients. Addressing oral health disparities will require policy solutions that are targeted to the populations most at need, and action plans that combine community and state level efforts.

10.
Am J Public Health ; 107(10): 1612-1614, 2017 10.
Artículo en Inglés | MEDLINE | ID: mdl-28817336

RESUMEN

OBJECTIVES: To assess the relation between Medicaid reimbursement rates and access to dental care services in the context of dentist density and dentist participation in Medicaid in each state. METHODS: Data were from Early and Periodic Screening, Diagnostic, and Treatment reports for 2014, Medicaid reimbursement rate in 2013, dentist density in 2014, and dentist participation in Medicaid in 2014. We assessed patterns of mediation or moderation. RESULTS: Reimbursement rates and access to dental care were directly related at the state level, but no evidence indicated that higher reimbursement rates resulted in overuse of dental services for those who had access. The relation between reimbursement rates and access to care was moderated by dentist density and dentist participation in Medicaid. We estimate that more than 1.8 million additional children would have had access to dental care if reimbursement rates were higher in states with low rates. CONCLUSIONS: Children who access the dental care system receive care, but reimbursement may significantly affect access. States with low dentist density and low dentist participation in Medicaid may be able to improve access to dental services significantly by increasing reimbursement rates.


Asunto(s)
Atención Dental para Niños/estadística & datos numéricos , Odontólogos/estadística & datos numéricos , Accesibilidad a los Servicios de Salud/estadística & datos numéricos , Reembolso de Seguro de Salud/estadística & datos numéricos , Medicaid/estadística & datos numéricos , Adolescente , Niño , Preescolar , Odontólogos/provisión & distribución , Humanos , Estados Unidos
13.
PLoS Pathog ; 11(3): e1004698, 2015 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-25741691

RESUMEN

Leukocyte Adhesion Deficiency I (LAD-I) is a primary immunodeficiency caused by single gene mutations in the CD18 subunit of ß2 integrins which result in defective transmigration of neutrophils into the tissues. Affected patients suffer from recurrent life threatening infections and severe oral disease (periodontitis). Microbial communities in the local environment (subgingival plaque) are thought to be the triggers for inflammatory periodontitis, yet little is known regarding the microbial communities associated with LAD-I periodontitis. Here we present the first comprehensive characterization of the subgingival communities in LAD-I, using a 16S rRNA gene-based microarray, and investigate the relationship of this tooth adherent microbiome to the local immunopathology of periodontitis. We show that the LAD subgingival microbiome is distinct from that of health and Localized Aggressive Periodontitits. Select periodontitis-associated species in the LAD microbiome included Parvimonas micra, Porphyromonas endodontalis, Eubacterium brachy and Treponema species. Pseudomonas aeruginosa, a bacterium not typically found in subgingival plaque is detected in LAD-I. We suggest that microbial products from LAD-associated communities may have a role in stimulating the local inflammatory response. We demonstrate that bacterial LPS translocates into the lesions of LAD-periodontitis potentially triggering immunopathology. We also show in in vitro assays with human macrophages and in vivo in animal models that microbial products from LAD-associated subgingival plaque trigger IL-23-related immune responses, which have been shown to dominate in patient lesions. In conclusion, our current study characterizes the subgingival microbial communities in LAD-periodontitis and supports their role as triggers of disease pathogenesis.


Asunto(s)
Síndrome de Deficiencia de Adhesión del Leucocito/inmunología , Leucocitos/inmunología , Periodontitis/microbiología , Porphyromonas gingivalis , Animales , ADN Bacteriano/genética , ADN Bacteriano/inmunología , Placa Dental/genética , Humanos , Interleucina-23/metabolismo , Síndrome de Deficiencia de Adhesión del Leucocito/metabolismo , Síndrome de Deficiencia de Adhesión del Leucocito/terapia , Ratones , Microbiota/inmunología , ARN Ribosómico 16S/genética
14.
J Oral Microbiol ; 7: 25951, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-25651832

RESUMEN

BACKGROUND AND OBJECTIVE: Bacterial invasion into pulps of primary teeth can lead to infection and premature tooth loss in children. This pilot study aimed to explore whether the microbiota of carious exposures of dental pulps resembles that of carious dentin or that of infected root canals. DESIGN: Children with severe early childhood caries were studied. Children were consented and extent of caries, plaque, and gingivitis measured. Bacteria were sampled from carious lesion biofilms and vital carious exposures of pulps, and processed by anaerobic culture. Isolates were characterized from partial sequences of the 16S rRNA gene and identified by comparison with taxa in the Human Oral Microbiome Database (http://www.HOMD.org). The microbiotas of carious lesions and dental pulps were compared using univariate and multivariate approaches. RESULTS: The microbiota of cariously exposed pulps was similar in composition to that of carious lesion biofilms except that fewer species/taxa were identified from pulps. The major taxa identified belonged to the phyla Firmicutes (mainly streptococci) and Actinobacteria (mainly Actinomyces species). Actinomyces and Selenomonas species were associated with carious lesions whereas Veillonella species, particularly Veillonella dispar was associated with pulps. Other bacteria detected in pulps included Streptococcus mutans, Parascardovia denticolens, Bifidobacterium longum, and several Lactobacillus and Actinomyces species. By principal, component analysis pulp microbiotas grouped together, whereas those in caries biofilms were widely dispersed. CONCLUSIONS: We conclude that the microbiota of cariously exposed vital primary pulps is composed of a subset of species associated with carious lesions. Vital primary pulps had a dominant Firmicutes and Actinobacteria microbiota which contrasts with reports of endodontic infections which can harbor a gram-negative microbiota. The microbiota of exposed primary pulps may provide insight into bacterial species at the forefront of caries invasion in dentinal lesions that can invade into the pulp and the nature of species that need suppressing for successful pulp therapy.

15.
Pediatr Dent ; 35(5): 416-21, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-24290553

RESUMEN

PURPOSE: To evaluate 1) if glass ionomer interim temporary restorations (ITR) placed for 1-3 months prior to vital pulp therapy (VPT) improved accuracy of diagnosing the pulp's clinical status and subsequent VPT success, and 2) the effect of the location of the carious lesion on VPT. METHODS: Primary molars (N=117) receiving pulp therapy with or without ITR were evaluated retrospectively. All teeth had caries extending >50 percent into dentin; caries lesion location was identified (proximal or non-proximal). Two examiners rated pulp status assessment, caries location, and pulp treatment, and correlated treatment outcomes after a mean of 34.7 months to these factors. RESULTS: VPT failed more often in first primary molars (P<.001) than in second primary molars. Using ITR improved diagnosis of the pulp status, clinical success of VPT, (P=.013) and first molar VPT success (P=.02). First primary molars had more proximal lesions than second molars (P<.001). Failure of VPT was greater for teeth with proximal lesions (P=.03). Use of ITR significantly improved VPT in teeth with proximal lesions (P=.007) but not non-proximal lesions (P=.38). CONCLUSIONS: ITR placed prior to VPT improved pulpal diagnosis and VPT outcomes. Vital pulp therapy was less successful in primary molars with proximal lesions, and ITR significantly improved the success.


Asunto(s)
Atención Dental para Niños/métodos , Caries Dental/terapia , Restauración Dental Provisional/métodos , Cementos de Ionómero Vítreo , Diente Molar/patología , Pulpitis/diagnóstico , Pulpotomía/métodos , Niño , Preescolar , Humanos , Pulpitis/terapia , Estudios Retrospectivos , Diente Primario , Resultado del Tratamiento
16.
Appl Environ Microbiol ; 78(7): 2264-71, 2012 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-22287009

RESUMEN

M102AD is the new designation for a Streptococcus mutans phage described in 1993 as phage M102. This change was necessitated by the genome analysis of another S. mutans phage named M102, which revealed differences from the genome sequence reported here. Additional host range analyses confirmed that S. mutans phage M102AD infects only a few serotype c strains. Phage M102AD adsorbed very slowly to its host, and it cannot adsorb to serotype e and f strains of S. mutans. M102AD adsorption was blocked by c-specific antiserum. Phage M102AD also adsorbed equally well to heat-treated and trypsin-treated cells, suggesting carbohydrate receptors. Saliva and polysaccharide production did not inhibit plaque formation. The genome of this siphophage consisted of a linear, double-stranded, 30,664-bp DNA molecule, with a GC content of 39.6%. Analysis of the genome extremities indicated the presence of a 3'-overhang cos site that was 11 nucleotides long. Bioinformatic analyses identified 40 open reading frames, all in the same orientation. No lysogeny-related genes were found, indicating that phage M102AD is strictly virulent. No obvious virulence factor gene candidates were found. Twelve proteins were identified in the virion structure by mass spectrometry. Comparative genomic analysis revealed a close relationship between S. mutans phages M102AD and M102 as well as with Streptococcus thermophilus phages. This study also highlights the importance of conducting research with biological materials obtained from recognized microbial collections.


Asunto(s)
Genoma Viral/genética , Análisis de Secuencia de ADN , Fagos de Streptococcus/genética , Fagos de Streptococcus/fisiología , Streptococcus mutans/virología , Secuencia de Bases , Biología Computacional/métodos , Humanos , Microscopía Electrónica de Transmisión , Datos de Secuencia Molecular , Sistemas de Lectura Abierta/genética , Proteoma , Fagos de Streptococcus/clasificación , Fagos de Streptococcus/ultraestructura , Streptococcus thermophilus/virología , Proteínas Estructurales Virales/genética , Proteínas Estructurales Virales/metabolismo , Acoplamiento Viral
18.
Appl Environ Microbiol ; 75(10): 3250-7, 2009 May.
Artículo en Inglés | MEDLINE | ID: mdl-19286780

RESUMEN

Formation of dental plaque is a developmental process involving initial and late colonizing species that form polymicrobial communities. Fusobacteria are the most numerous gram-negative bacteria in dental plaque, but they become prevalent after the initial commensal colonizers, such as streptococci and actinomyces, have established communities. The unusual ability of these bacteria to coaggregate with commensals, as well as pathogenic late colonizers, has been proposed to facilitate colonization by the latter organisms. We investigated the integration of Fusobacterium nucleatum into multispecies communities by employing two in vitro models with saliva as the sole nutritional source. In flow cell biofilms, numbers of cells were quantified using fluorescently conjugated antibodies against each species, and static biofilms were analyzed by quantitative real-time PCR (q-PCR) using species-specific primers. Unable to grow as single-species biofilms, F. nucleatum grew in two-species biofilms with Actinomyces naeslundii but not with Streptococcus oralis. However, enhanced growth of fusobacteria was observed in three-species biofilms, indicating that there was multispecies cooperation. Importantly, these community dynamics yielded an 18-fold increase in the F. nucleatum biomass between 4 h and 18 h in the flow cell inoculated with three species. q-PCR analysis of static biofilms revealed that maximum growth of the three species occurred at 24 h to 36 h. Lower numbers of cells were observed at 48 h, suggesting that saliva could not support higher cell densities as the sole nutrient. Integration of F. nucleatum into multispecies commensal communities was evident from the interdigitation of fusobacteria in coaggregates with A. naeslundii and S. oralis and from the improved growth of fusobacteria, which was dependent on the presence of A. naeslundii.


Asunto(s)
Actinomyces/crecimiento & desarrollo , Fusobacterium nucleatum/crecimiento & desarrollo , Saliva/microbiología , Streptococcus oralis/crecimiento & desarrollo , Biopelículas/crecimiento & desarrollo , Biomasa , Recuento de Colonia Microbiana/métodos , Placa Dental/microbiología , Microscopía Confocal
19.
J Bacteriol ; 190(24): 8145-54, 2008 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-18805978

RESUMEN

Streptococci and veillonellae occur in mixed-species colonies during formation of early dental plaque. One factor hypothesized to be important in assembly of these initial communities is coaggregation (cell-cell recognition by genetically distinct bacteria). Intrageneric coaggregation of streptococci occurs when a lectin-like adhesin on one streptococcal species recognizes a receptor polysaccharide (RPS) on the partner species. Veillonellae also coaggregate with streptococci. These genera interact metabolically; lactic acid produced by streptococci is a carbon source for veillonellae. To transpose these interactions from undisturbed dental plaque to an experimentally tractable in vitro biofilm model, a community consisting of RPS-bearing streptococci juxtaposed with veillonellae was targeted by quantum dot-based immunofluorescence and then micromanipulated off the enamel surface and cultured. Besides the expected antibody-reactive cell types, a non-antibody-reactive streptococcus invisible during micromanipulation was obtained. The streptococci were identified as Streptococcus oralis (RPS bearing) and Streptococcus gordonii (adhesin bearing). The veillonellae could not be cultivated; however, a veillonella 16S rRNA gene sequence was amplified from the original isolation mixture, and this sequence was identical to the sequence of the previously studied organism Veillonella sp. strain PK1910, an oral isolate in our culture collection. S. oralis coaggregated with S. gordonii by an RPS-dependent mechanism, and both streptococci coaggregated with PK1910, which was used as a surrogate during in vitro community reconstruction. The streptococci and strain PK1910 formed interdigitated three-species clusters when grown as a biofilm using saliva as the nutritional source. PK1910 grew only when streptococci were present. This study confirms that RPS-mediated intrageneric coaggregation occurs in the earliest stages of plaque formation by bringing bacteria together to create a functional community.


Asunto(s)
Adhesión Bacteriana , Biopelículas , Placa Dental/microbiología , Streptococcus gordonii/crecimiento & desarrollo , Streptococcus oralis/crecimiento & desarrollo , Veillonella/crecimiento & desarrollo , Esmalte Dental/microbiología , Genes Bacterianos , Genes de ARNr , Humanos , Microscopía Confocal , Datos de Secuencia Molecular , Filogenia , Polisacáridos Bacterianos/metabolismo , Puntos Cuánticos , ARN Bacteriano/genética , ARN Ribosómico 16S/genética , Streptococcus gordonii/genética , Streptococcus gordonii/metabolismo , Streptococcus oralis/genética , Streptococcus oralis/metabolismo , Veillonella/genética , Veillonella/metabolismo
20.
Antimicrob Agents Chemother ; 52(2): 638-42, 2008 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-18086848

RESUMEN

Antimicrobial peptides are short, positively charged, amphipathic peptides that possess a wide spectrum of antimicrobial activity and have an important role in the host's innate immunity. Lack of, or dysfunctions in, antimicrobial peptides have been correlated with infectious diseases, including periodontitis. Porphyromonas gingivalis, a gram-negative anaerobe and a major pathogen associated with periodontal diseases, is resistant to antimicrobial peptides of human and nonhuman origin, a feature that likely contributes to its virulence. Expressing a robust proteolytic activity, P. gingivalis hydrolyzes antimicrobial peptides. In this study, P. gingivalis inactivated three antimicrobial peptides, while a d-enantiomer was resistant to degradation. P. gingivalis was resistant to the protease-resistant d-enantiomer peptide, and importantly, a protease-deficient P. gingivalis mutant was also resistant to the antimicrobial peptide. Finally, the binding of a fluorescently labeled antimicrobial peptide to protease-deficient P. gingivalis was much weaker than the binding of susceptible Escherichia coli. Our results suggest that the resistance of P. gingivalis ATCC 33277 to direct killing by antimicrobial peptides is protease independent and results (at least partially) from the low affinity of antimicrobial peptides to P. gingivalis.


Asunto(s)
Péptidos Catiónicos Antimicrobianos/farmacología , Farmacorresistencia Bacteriana , Péptido Hidrolasas/metabolismo , Porphyromonas gingivalis/efectos de los fármacos , Secuencia de Aminoácidos , Péptidos Catiónicos Antimicrobianos/química , Histatinas/química , Histatinas/farmacología , Humanos , Pruebas de Sensibilidad Microbiana , Datos de Secuencia Molecular , Mutación , Péptido Hidrolasas/genética , Porphyromonas gingivalis/enzimología , Porphyromonas gingivalis/genética , Porphyromonas gingivalis/crecimiento & desarrollo , Catelicidinas
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