[Polymicrobial liver abscesses and pleural empyema in a 40-year-old male after tooth extraction and closed periodontal treatment: A case report]. / Polymikrobielle Leberabszesse und Pleuraempyem bei einem 40-jährigen Mann nach Zahnextraktion und geschlossener Parodontitis-Behandlung: Ein Fallbericht.

We report on a 40-year-old patient who presented with fever, right upper abdominal pain, right-sided chest pain and acute dyspnea. Imaging revealed several liver abscesses, as well as extensive right pleural empyema. Sixteen weeks previously, the patient underwent tooth extraction of the third molars (18, 28, 38, 48) and a first molar (46), and systematic closed periodontitis treatment. Four different species of the physiological microbiota of the oral cavity were detected in the pleura or liver abscess punctate (Streptococcus anginosus, Streptococcus constellatus, Actinomyces odontolyticus, Prevotella denticola). An underlying immune defect was ruled out. Ultrasound-guided drainage of liver abscesses and surgical treatment of pleural empyema by video-assisted thoracoscopy (VATS) and insertion of thoracic suction drains was performed, accompanied by targeted antibiotic therapy. Over a course of 6 weeks, the patient recovered completely. The case report illustrates severe infectious side effects of major dental interventions, and it critically summarizes current dental guideline recommendations on peri-interventional antimicrobial therapy. Therefore, a good clinical follow up after major tooth extractions is imperative.

Infección por Actinomyces viscosus en trasplantado de riñón-páncreas / Actinomyces viscosus infection in a kidney-pancreas trasplanted patient

No disponible

[Actinomycosic mycetoma of the foot in Morocco due to Actinomycetes viscosus]. / Mycétome actinomycosique du pied à Actinomycetes viscosus au Maroc.

We present the case of an actinomycotic mycetoma of the foot due to Actinomycetes viscosus. It evolved for nine years on the foot of a 26-year-old patient from a rural environment: Douar Inezgane (city in southern Morocco). Bacteriological study of the skin and grains confirmed the diagnosis. It showed positive bacilli on direct examination and on Gram staining and in positive culture. Histological study showed a polymorphous granulomatous inflammation without signs of malignancy with actinomycotic grains. Then we retained the diagnosis of primary cutaneous actinomycosis without visceral locations. The treatment was based on antibiotics: penicillin G by intravenous infusion for five weeks, relayed orally by amoxicillin associated with trimethoprim-sulfamethoxazole for long periods. After six months of treatment, we observed a favorable outcome with reduction of the swelling, nodules, lymphadenopathy, fistula's number and extension of time of issue of grains. The current follow up is 15 months. The primary cutaneous actinomycosis is still relevant in Morocco.

New bacterial composition in primary and persistent/secondary endodontic infections with respect to clinical and radiographic findings.

INTRODUCTION: The aim of the present study was to analyze the microbiota of primary and secondary/persistent endodontic infections of patients undergoing endodontic treatment with respect to clinical and radiographic findings. METHODS: Samples from the root canals of 21 German patients were taken using 3 sequential sterile paper points. In the case of a root canal filling, gutta-percha was removed with sterile files, and samples were taken using sterile paper points. The samples were plated, and microorganisms were then isolated and identified morphologically by biochemical analysis and sequencing the 16S rRNA genes of isolated microorganisms. RESULTS: In 12 of 21 root canals, 33 different species could be isolated. Six (50%) of the cases with isolated microorganisms were primary, and 6 (50%) cases were endodontic infections associated with root-filled teeth. Twelve of the isolated species were facultative anaerobic and 21 obligate anaerobic. Monomicrobial infections were found for Enterococcus faecalis and Actinomyces viscosus. E. faecalis was most frequently isolated in secondary endodontic infections (33%). Moraxella osloensis was isolated from a secondary endodontic infection that had an insufficient root canal filling accompanied by a mild sensation of pain. A new bacterial composition compromising Atopobium rimae, Anaerococcus prevotii, Pseudoramibacter alactolyticus, Dialister invisus, and Fusobacterium nucleatum was recovered from teeth with chronic apical abscesses. CONCLUSIONS: New bacterial combinations were found and correlated to clinical and radiographic findings, particularly to chronic apical abscesses. M. osloensis was detected in root canals for the second time and only in German patients.

Microbial analysis of subgingival plaque samples compared to that of whole saliva in patients with periodontitis.

BACKGROUND: The detection of special bacterial species in patients with periodontitis is considered to be useful for clinical diagnosis and treatment. The collection of subgingival plaque samples is the common way for the determination of periodontopathic bacteria. However, recently, salivary analysis has been discussed as an advantageous future diagnostic method for periodontitis because it offers simple quantitative sampling and the possibility to assess various bacteria. The aim of this cross-sectional study is to investigate whether there is a correlation between the results of different bacterial species in saliva and subgingival plaque samples from individuals with aggressive periodontitis (AgP) and chronic periodontitis (CP). METHODS: Whole saliva and subgingival plaque samples from the deepest pocket of each quadrant were collected from 43 patients with CP and 33 patients with AgP. Twenty different bacterial species from both samplings were determined by the 16S ribosomal RNA-based polymerase chain reaction with microarray technique. RESULTS: All bacterial species were detected in salivary and subgingival plaque samples. For Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis, Treponema denticola, and Tannerella forsythia, as well as Actinomyces viscosus, Campylobacter rectus/showae, Prevotella intermedia, Parvimonas micra, Eubacterium nodatum, and Campylobacter gracilis, a significant positive correlation between salivary and subgingival plaque samples was detected in patients with both types of periodontitis. There were no significant differences in bacteria in salivary and subgingival plaque samples between AgP and CP. CONCLUSION: Salivary analysis might be discussed as a potential alternative to subgingival plaque sampling for microbiologic analysis in both AgP and CP.

Effects of maltitol and xylitol chewing-gums on parameters involved in dental caries development.

AIM: The effects on plaque parameters of sugar free chewing-gums (CG) sweetened with either maltitol or xylitol were assessed to better understand the role polyols can play in dental caries prevention. MATERIALS AND METHODS: A double-blind, parallel, randomised, controlled study was conducted in China. Subjects (N = 258, age = 13 to 15 years-old) were divided into 4 groups: 2 receiving polyols CG, containing respectively maltitol or xylitol, a group receiving gum base (placebo) and a negative control group not receiving any gum. CG were chewed for 30 days. This corresponds to a 10 g consumption of polyol per day. Plaque parameters (growth, pH, bacteria and insoluble glucans) were evaluated throughout the experimental period. RESULTS: All parameters studied were significantly modified with gum base compared to no-gum: plaque pH increased; plaque growth, bacteria (S. mutans, S. sobrinus, A. viscosus and Lactobacillus) and insoluble glucans decreased. Maltitol and xylitol CG led similarly to a higher plaque pH (AUC, p⋜0.05) on short (at baseline after the first CG consumption) and long term (after 4 weeks of daily CG consumption), with or without saliva stimulation compared to both control and placebo groups. They led to a decrease in plaque growth (p=0.02) over the experimental period compared to controls. Moreover, they significantly reduced the concentration of 4 cariogenic bacteria species (p⋜0.05) in dental plaque compared to gum base. CONCLUSION: Sugar free CG sweetened with either maltitol or xylitol can similarly reduce plaque acidogenicity compared to gum base through a decrease in oral bacteria presence. The use of a gum base placebo allowed to isolate effects on parameters involved in dental caries development specific to maltitol and xylitol, and to show these effects were similar.

Clinical and microbiological evaluation of the carious dentin before and after application of Papacarie gel.

OBJECTIVE: To evaluate clinically and microbiologically the efficacy of Papacarie in the removal of carious dentin in both permanent and primary teeth. STUDY DESIGN: Thirty permanent and primary molars with dentinal carious lesions were excavated and subjected to clinical and microbiological assessment before and after application of Papacarie. The gel was further tested for in vitro antimicrobial efficacy against standard cariogenic micro-organisms using agar diffusion assay. RESULTS: Papacarie was able to differentiate between infected and affected dentin clinically along with high patient comfort during caries excavation. The mean time taken for caries removal and restoration was observed to be 4.17 +/- 0.40 min. and 8.57 +/- 0.45 min. for permanent teeth and 4.21 +/- 0.36 min. and 9.24 +/- 0.58 min. for primary teeth. There was a significant reduction in the total viable colony forming units from the dentin samples before and after application of Papacarie. It was also observed that Papacarie had no inhibitory effect on standard cariogenic microorganisms in the agar diffusion assay. CONCLUSIONS: Papacarie is an effective caries removal method clinically in both permanent and primary teeth. The number of viable microorganisms after complete caries excavation using Papacarie still appears to be high and this bacterial count should be tackled by a suitable restorative material with potent antimicrobial activity.

Fatal subdural empyema caused by Streptococcus constellatus and Actinomyces viscosus in a child--case report.

Group milleri streptococci that colonize the mouth and the upper airways are generally considered to be commensal. In combination with anaerobics, they are rarely responsible for brain abscesses in patients with certain predisposing factors. Mortality in such cases is high and complications are frequent. We present a case of fatal subdural empyema caused by Streptococcus constellatus and Actinomyces viscosus in a previously healthy 7-year-old girl.

Identification of dominant pathogens in periapical lesions associated with persistent apical periodontitis.

OBJECTIVE: to identify dominant pathogens in the periapical lesions associated with persistent apical periodontitis. METHODS: thirty-three root-filled teeth with persistent apical periodontitis referred for surgical treatment were selected. Microbial samples were collected from the periapical lesions during apical surgery. Microbial identification was performed with species-specific primers prepared according to the sequence analysis data using a 16S rRNA technique. RESULTS: among the 33 cases, in 5 cases none of the target species were detected, 6 cases showed the presence of only one species, and 22 cases showed more than two species. Porphyromonas endodontalis (45% of sample) was the most commonly detected dominant microbial species in the study sample, followed by Actinomyces viscosus (42%), Candida albicans (36%) and Porphyromonas gingivalis (27%). Fusobacterium, Actinomyces israelii and Enterococcus faecalis were also detected in 27%, 21% and 15% of the sample, respectively. The most frequently isolated species, P. endodontalis, was in most cases detected together with Actinomyces (14 cases) and P. gingivalis (6 cases). None of the lesions analysed in the present study contained Prevotella intermedia. There was no correlation in relation to the presence of sinus tracts and the bacterial species. CONCLUSION: a mixed population of pathogens was found in the endodontic lesions associated with persistent apical periodontitis. P. endodontalis, A. viscosus, C. albicans and P. gingivalis were the dominant species identified.

Microflora associated with successful and failed orthodontic mini-implants.

OBJECTIVES: Mini-implants are used for orthodontic bone anchorage. The reasons for a potential instability or loss of the mini-implants during treatment are multiple. Among other factors, colonization of implants with pathogenic bacteria is discussed. Therefore, the microflora associated with successful and failed mini-implants has been screened. MATERIAL AND METHODS: A total of 76 mini-implants collected from 25 patients were observed during regular orthodontic treatment. Bacterial samples of eight failed and - exemplarily - four successful (control) cases were subjected to a universal Bacteria-directed real-time quantitative polymerase chain reaction for quantification in combination with a microarray-based identification of 20 selected species. RESULTS: The failure rate in the present investigation was 10.5%. The bacterial analysis did not reveal any major difference in the total amount or species composition between control and failed mini-implants. However, Actinomyces viscosus was found in four (100%) and Campylobacter gracilis in three (75%) stable controls, whereas both species were rarely found (12.5%) in failed implants. CONCLUSIONS: In the present study, the peri-implant sulcus surrounding failed orthodontic mini-implants did not show a specific aggressive bacterial flora.

Cutaneous actinomycosis: a rare case.

Cutaneous actinomycosis is a rare presentation. Here we present a case of cutaneous actinomycosis with no history of trauma or systemic dissemination. The isolate was identified as Actinomyces viscosus by standard methods. The isolate was found to be penicillin resistant by Kirby Bauer disc diffusion method. Therefore, the patient was treated with cotrimoxazole and improved. Thus, this case highlights the importance of isolation and susceptibility testing in actinomycotic infection. The sinuses have healed, and the patient has recovered.

Actinomyces viscosus endocarditis requiring aortic valve replacement.

We report a case of primary Actinomyces viscosus endocarditis, an unusual manifestation of actinomycosis, in a 43-year-old farmer with an indolent febrile illness. As has occurred in previous cases, diagnosis was delayed in part because blood isolates were misidentified. Months later when she required aortic valve and root replacement, histologic exam of the diseased valve revealed branching filamentous organisms and the original blood isolates were retrospectively confirmed to be Actinomyces viscosus.

A rare case of primary actinomycosis of the breast caused by Actinomyces viscosus: diagnosis by fine-needle aspiration cytology under ultrasound guidance.

We report the case of a 27-year-old woman with primary actinomycosis of the breast. Diagnosis was established by culture examination of specimen recovered by fine-needle aspiration cytology (FNAC) under ultrasound guidance. To our knowledge, this is the first description in the literature of a case of primary actinomycosis of the breast caused by Actinomyces viscosus. Twenty-nine previous cases of primary actinomycosis of the breast have been published, but these were caused by the more common species Actinomyces israelii. Targeted antibiotic therapy did not ameliorate the condition, thus drainage and excision of the mass were carried out. No other medical therapy was administered. Six years after surgery, no recurrence has been observed on both ultrasonographic and mammographic examinations.

Occurrence of Actinomyces in infections of endodontic origin.

Species of Actinomyces have been associated with endodontic treatment that failed to heal. In this study polymerase chain reaction was used with a pair of universal primers for Actinomyces and species-specific primers to evaluate the contents of infected root canals and aspirates from abscesses or cellulitis for the presence of Actinomyces israelii, A. naeslundii, and A. viscosus. DNA was extracted from 131 clinical samples. DNA from 2 of the original 131 samples was not available for polymerase chain reaction with the universal primer for Actinomyces and A. naeslundii. DNA reacting with the universal primer for Actinomyces was detected in 72 of 129 (55.8%) clinical samples. Of those 41 of 51 (80.4%) were from infected root canals, 22 of 48 (45.8%) were from abscesses, and 9 of 30 (30%) were associated with cellulitis. A. viscosus was detected in 42 of 131 (32.1%) clinical samples. Of those 31 of 52 (59.6%) were from infected root canals, 6 of 43 (14%) were from abscesses, and 5 of 36 (13.9%) were associated with cellulitis. A. israelii was detected in 31 of 131 (23.7%) clinical samples. Of those 14 of 52 (26.9%) were from infected root canals, 11 of 43 (25.6%) were from abscesses, and 6 of 36 (16.7%) were associated with cellulitis. A. naeslundii was detected in 11 of 131 (8.5%) clinical samples. Of those 7 of 51 (13.7%) were from infected root canals, 2 of 48 (4.2%) were from abscesses, and 2 of 30 (6.7%) were associated with cellulitis.

Actinomyces spp. in supragingival plaque of ethnic Chinese preschool children with and without active dental caries.

Very limited molecular epidemiological data are available on the role of Actinomyces spp. in the pathogenesis of caries in the primary dentition. Therefore, we investigated their distribution in supragingival plaque of ethnic Chinese preschool children from Singapore and Hong Kong, either with or without active caries. Plaque samples were taken from intact interproximal enamel areas using dental floss. Bacterial genomic DNA of each sample was extracted and variable regions of 16S ribosomal DNA amplified and labelled with digoxigenin. Oligonucleotide probes specific for Actinomyces bovis, Actinomyces gerencseriae, Actinomyces israelii, Actinomyces meyeri, Actinomyces odontolyticus, catalase-negative Actinomyces naeslundii (genospecies 1 and 2) and catalase-positive Actinomyces naeslundii genospecies 2 (previously Actinomyces viscosus serotype II) were used to detect these species using Southern hybridization with a Minislot and Miniblotter system. A. odontolyticus, A. gerencseriae and A. meyeri were detected with similar frequency in both Singapore and Hong Kong samples or in those with and without active caries. However, the prevalence of A. naeslundii was significantly different in the two locales (p<0.05). A. odontolyticus (88.7%), A. gerencseriae (56.6%) and A. naeslundii (50.9%) were detected in a majority of the samples and the positive hybridization signals of A. gerencseriae in the caries-active group were stronger than from the caries-free group. A. bovis and A. israelii were undetectable in any of the samples. These data imply that A. odontolyticus, A. naeslundii and A. gerencseriae may play an important role in supragingival plaque formation on primary teeth in ethnic Chinese, with others such as A. meyeri contributing.

Effect of sustained-release chlorhexidine varnish on Streptococcus mutans and Actinomyces viscosus in orthodontic patients.

This study evaluated the effect of sustained-release chlorhexidine varnish on orthodontic patients. Ten children, ages 10 to 16 years, participated. Bacterial levels of Streptococcus mutans and Actinomyces viscosus and total counts were evaluated in sputum samples. These counts were evaluated at 4 stages: before orthodontic treatment, at least 2 weeks after bonding of the brackets, 1 week after application of chlorhexidine varnish, and 3 weeks after application of chlorhexidine varnish. Increases in bacterial levels of S mutans and in the total bacterial count were detected after the brackets were bonded. One week after the sustained-release chlorhexidine varnish was applied, a significant decrease of total bacterial levels and S mutans was observed. This decrease persisted for 3 weeks after the first application. No significant change in A viscosus levels occurred during that period. The results provide additional evidence that sustained-release chlorhexidine varnish decreases S mutans levels in orthodontic patients with fixed appliances and therefore might be useful in preventing caries lesions.

Bacteriophage isolation from human saliva.

AIMS: To detect bacteriophages for Gram-positive oral pathogens in human saliva. METHODS AND RESULTS: Saliva samples from 31 donors were screened for the presence of bacteriophages for Streptococcus sobrinus, Streptococcus mutans, Streptococcus salivarius, Actinomyces viscosus and Enterococcus faecalis. Bacteriophages for Enterococcus faecalis were found in seven samples. Enterococcus faecalis phages were still present in saliva re-collected from one donor one month, and one year after initial saliva collection. CONCLUSIONS: The presence and stability of the Enterococcus faecalis bacteriophages in human saliva suggests a possible role of these bacteriophages in the oral ecosystem. SIGNIFICANCE AND IMPACT OF THE STUDY: Phage therapy as a way to control oral bacteria might be considered.

Antibacterial activity of particulate bioglass against supra- and subgingival bacteria.

Particulate Bioglass is a bioactive material used in the repair of periodontal defects. This material undergoes a series of surface reactions in an aqueous environment which lead to osseointegration. The aim of this study was to determine whether these reactions exerted an antibacterial effect on a range of oral bacteria. Streptococcus sanguis, Streptococcus mutans and Actinomyces viscosus were suspended in nutrient broth (NB), artificial saliva (AS) or Dulbecco's modified eagle medium plus 10% foetal calf serum (DMEM + 10%FCS), with or without particulate Bioglass. All bacteria showed reduced viability following exposure to Bioglass in all the media after 1 h. This antibacterial effect increased after 3 h. Porphyromonas gingivalis, Fusobacterium nucleatum, Prevotella intermedia and Actinobacillus actinomycetemcomitans were suspended in either BM broth or 40% horse serum (HS) in RPMI. A considerable reduction in viability was observed with all bacteria tested, in both media, compared to inert glass controls. In further experiments it was found that the viability of S. sanguis was significantly reduced following exposure to NB pre-incubated with Bioglass. Additionally, it was found that neutralisation of this highly alkaline solution eliminated the antibacterial effect. Moreover, a solution of NB and NaOH (of equivalent pH) exerted an antibacterial effect of similar magnitude to that of the solution pre-incubated with Bioglass. Thus, particulate Bioglass exerts an antibacterial effect on certain oral bacteria, possibly by virtue of the alkaline nature of its surface reactions. This may reduce bacterial colonisation of its surface in vivo.

Endocarditis due to Actinomyces viscosus.

We report a case of endocarditis caused by Actinomyces viscosus in a previously healthy young adult with no known identifiable portal of entry. Infective endocarditis caused by A viscosus is uncommon; two cases of endocarditis caused by this species have been previously reported. Primary actinomycotic endocarditis has been previously reviewed in 1993; we provide a review of additional cases since that report. In comparing our case with the other reported cases, we found that actinomycotic endocarditis (1) occurs in a wide spectrum of age, (2) affects primarily males, (3) has a high propensity for systemic embolization, and (4) has involved only native heart valves. The disease is manifested by the typical signs and symptoms of infective endocarditis and is curable with long-term penicillin therapy. The use of echocardiography in the diagnosis of endocarditis, techniques for improving the microbiologic diagnosis of endocarditis, and current indications for surgical intervention are discussed.

Comparación del crecimiento in vitro del actinomyces viscosus con edulcorantes / In vitro comparison of the growth of actinomyces viscosus with sweetening agents

El objetivo del estudio fue observar las posibles variaciones del crecimiento y le pH in vitro del actinomyces viscosus en medio mínimo, con edulcorantes (xilitol, sorbitol, aspartame, sacarina sódica, sucralosa) en concentraciones del 1, 2, 3, 4 y 5 por ciento, teniendo como cultivo control uno sin ningún tipo de edulcorante y otros con sacarosa, con el fin de analizar su potencial cariogénico. Se realizó una investigación de tipo descriptivo comparativo de diseño experimental. Se tomó como control positivo el azúcar y como control negativo el medio de cultivo sin edulcorante. El crecimiento del microorganismo se estableció a través de la turbidimetría. Los datos obtenidos se analizaron con la prueba H de Krusal-Wallis o fórmula de análisis de varianza de un factor por rangos. Se concluyó que la sacarina sódica produjo la mayor inhibición en el crecimiento del Actinomyces viscosus, seguida por el sorbitol. El actinomyces viscosus en la presencia de xilitol, sucralosa, aspartame y sacarosa presentó crecimiento. El pH en todas las mediciones se mantuvo constante en 6