Análisis in vitro de la elasticidad y la flexión del Peek

El PEEK tiene varias aplicaciones en el ámbito de la odontología debido a su gran biocompatibilidad. No obstante, no se conoce de manera específica el comportamiento físico-mecánico de este material. Por ello, el objetivo de este estudio in vitro ha sido evaluar y comparar la resistencia a la flexión y el módulo de elasticidad de distintas muestras fabricadas a partir del PEEK. En este estudio, se fabricaron diez muestras de PEEK con unas dimensiones específicas (longitud x anchura x grosor) obteniendo así, dos grupos clasificados según el grosor/espesor de las muestras: un primer grupo con 5 muestras de 24x15x2 mm y otro grupo con 5 muestras de 24x15x15 mm. Seguidamente, todas las muestras fueron sometidas a una prueba de flexión de tres puntos en una máquina de prueba universal Zwick/Roell. Los resultados nos muestran que el primer grupo de probetas de PEEK con un espesor de 2 mm presenta valores más elevados de módulo de elasticidad y resistencia a la flexión en comparación con el grupo de probetas de 1,5 mm de grosor

Removal of a migrated dental implant from a maxillary sinus through an intraoral approach : a case report

The replacement of maxillary posterior teeth often challenges the clinician due to bone resorption after dental exodontia and low bone quality. Currently, attempts are being made to shorten treatment times by placing implants simultaneously to sinus lif

Gender differences among professionals dedicated to Oral Implantology in Spain : an observational study

Despite the development of society and the educational progress achieved at the university education level, women continue to face obstacles that hinder their professional development. This study aims to determine whether there are gender differences in

Prevalence of aphthous stomatitis in patients with inflammatory bowel disease after the treatment with monoclonal antibodies:a systematic review and meta-analysis

Currently, the most frequently employed therapies in the treatment of inflammatory bowel diseases (IBD), i.e., Crohn's Disease (CD), Ulcerative Colitis (UC) or unclassified IBD (IBD-U) are monoclonal anti-TNFs and anti-integrin therapies, such as vedolizumab (VDZ). Forty-seven per cent of these patients present extra-intestinal manifestations, the second most prevalent being aphthous stomatitis (AS). The present study aims to investigate which of the two therapies is associated with a lower prevalence of AS after treatment. An electronic search of the MEDLINE (via PubMed), Web of Science, SCOPUS, LILACS and OpenGrey databases was carried out. The criteria used were those described by the PRISMA Statement. The search was not temporarily restricted and was updated to January 2022. The quality assessment was analyzed using the JBI Prevalence Critical Appraisal Tool. After searching, 7 studies were included that met the established criteria. Of these, 6 analysed the prevalence of AS in CD patients and 4 in UC. A total of 1,744 patients were analysed (CD=1,477 patients; 84.69%; UC=267; 15.31%). The greatest reduction in AS prevalence was observed after anti-TNF therapy. The effect of these therapies on the prevalence of AS in patients with IBD-U could not be determined. Both biologic therapies achieve a reduction in the prevalence of AS in IBD patients (CD and UC). However, the best results were obtained in patients treated with anti-TNFs, possibly because VDZ is often used in patients who do not respond adequately to previous treatment with anti-TNFs and because of its intestinal specificity

The use of platelet‐rich fibrin in vestibuloplasty: A 36‐month follow‐up technique report

Introduction Vestibuloplasty is a mucogingival procedure that aims to increase the vestibule and the amount of keratinized tissue (KT) around teeth and dental implants. Currently, the gold standard in this procedure is still represented by free gingival grafts (FGGs); however, they require a second surgical site, which means more morbidity for the patient and a higher risk of surgical complications, as well as surgical time and chromatic alteration of the recipient area. Case Presentation This is a description of the vestibuloplasty technique with platelet-rich fibrin (PRF) in a 35-year-old female patient with a thin gingival phenotype and no medical history of interest. The reason for consultation was tooth sensitivity during brushing and the presence of recessions in the fifth sextant. Conclusions The use of PRF as a graft biomaterial in vestibuloplasty is a valid and effective option as an alternative to secondary epithelialization of the surgical site, as well as to FGGs, with acceptable results in terms of KT gain and root coverage, and with minimal postoperative discomfort

Selective Serotonin Reuptake Inhibitors as a risk factor for dental implant fail- ure: A retrospective clinical study

Introduction: The trend in recent decades in Europe and the United States points to an exponential increase in the consumption of antidepressant drugs and, in particular, selective serotonin reuptake inhibitors (SSRIs). This retrospective study aims to investigate whether there is an association between SSRI intake and dental implant (DI) failure and, secondarily, the influence of other systemic and local factors. Material and Methods: This cohort retrospective study is in concordance with the STROBE guidelines for observational studies. One-hundred seventy patients received 573 DIs between 2014 and 2020. Results: The reported DI failure rate was 6.11%. Of these, 18.31% failed in patients treated with SSRIs while 4.38% failed in healthy patients (p<0.001). Specifically, the use of these drugs was associated with a 4.53 times higher rate of DI failure, and, in the multivariate analysis, 3.70 times higher adjusted risk was found. A lower survival rate at 90 months follow-up was also observed in these patients compared to those not taking these drugs (84.30% vs. 96%; p=0.00014). Conclusions: With the limitations of the present study, it can be affirmed that there is a relationship between the intake of SSRIs and DI failure, as well as a lower survival rate in these patients

Preventive antibiotic therapy in the placement of immediate implants: a systematic review

Immediate implants present a high risk of early failure. To avoid this, preventive antibiotics (PAs) are prescribed; however, their inappropriate administration leads to antimicrobial resistance. The present study aims to clarify whether the prescription of PAs reduces the rate of early failure of immediate implants and to establish guidelines to avoid the overprescription of these drugs. An electronic search of the MEDLINE database (via PubMed), Web of Science, Scopus, LILACS and OpenGrey was carried out. The criteria described in the PRISMA® statement were used. The search was temporarily restricted from 2010 to 2021. The risk of bias was analysed using the SIGN Methodological Assessment Checklist for Systematic Reviews and Meta-Analyses and the JBI Prevalence Critical Appraisal Tool. After searching, eight studies were included that met the established criteria. With the limitations of this study, it can be stated that antibiotic prescription in immediate implants reduces the early failure rate. Preoperative administration of 2–3 g amoxicillin one hour before surgery followed by 500 mg/8 h for five to seven days is recommended. It is considered prudent to avoid the use of clindamycin in favour of azithromycin, clarithromycin or metronidazole in penicillin allergy patients until further studies are conducted

Is Penicillin Allergy a Risk Factor for Early Dental Implant Failure? A Systematic Review

The prescription of preventive antibiotics in dental implant treatments reduces the incidence of early failures. This study has focused mainly on the influence of amoxicillin, which is contraindicated in penicillin-allergic patients. The present systematic review aimed to determine whether penicillin-allergic patients have a higher risk of implant failure compared to non-allergic patients. An electronic search was performed on Medline and Web of Science using the following MeSH terms: (penicillin allergy OR clindamycin OR erythromycin OR azithromycin OR metronidazole) AND (dental implant OR dental implant failure OR dental implant complications). The criteria employed were those described in the PRISMA® Declaration. Only five articles were included that analyzed the failure rates of implants placed in penicillin-allergic patients who were prescribed clindamycin compared to non-allergic patients who were prescribed amoxicillin. With the limitations of this study, it is not possible to state that penicillin allergy per se constitutes a risk factor for early dental implant failure as most of the studies included self-reported allergic patients. Clindamycin has been associated with a significantly elevated risk of failure and an up to six times increased risk of infection. Immediate implants also have a 5.7 to 10 times higher risk of failure

Consensus Report on Preventive Antibiotic Therapy in Dental Implant Procedures: Summary of Recommendations from the Spanish Society of Implants

Current patterns of preventive antibiotic prescribing are encouraging the spread of antimicrobial resistance. Recently, the Spanish Society of Implants (SEI) developed the first clinical practice guidelines published to date, providing clear guidelines on how to prescribe responsible and informed preventive antibiotic therapy (PAT) based on the available scientific evidence on dental implant treatments (DIs). The present document aims to summarise and disseminate the recommendations established by this expert panel. These were based on the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. Studies were analysed using the Scottish Intercollegiate Guidelines Network (SIGN) checklist templates and ranked according to their level of evidence. They were then assigned a level of recommendation using the Grading of Recommendations, Assessment, Development and Evaluation system (GRADE). Guidelines were established on the type of PAT, antibiotic and dosage of administration in the placement of DIs without anatomical constraints, in bone augmentation with the placement of DIs in one or two stages, placement of immediate DIs, sinus elevations, implant prosthetic phase, as well as recommendations in patients allergic to penicillin. Therefore, the PAT must be adapted to the type of implant procedure to be performed

Community Detection in Twitter

Twitter has evolved into a source of social, political and real time information in addition to being a means of mass-communication and marketing. Monitoring and analyzing information on Twitter can lead to invaluable insights, which might otherwise be hard to get using conventional media resources. An important task in analyzing highly networked information sources like twitter is to identify communities that are formed. A community on twitter can be defined as a set of users that are more similar to other members than to non-members. We present a technique to devise a similarity metric between any two users on twitter based on the similarity of their content, links and metadata. The link structure on Twitter can be characterized using the twitter notion of followers, being followed and the @Mentions, @Reply and @RT tags in tweets. Content similarity is characterized by the words in the tweets combined with the hash-tags they are annotated with. Meta-data similarity includes similarity based on other sources of user information such as location, age and gender. We then use this similarity metric to cluster users into communities using spectral and bottom-up agglomerative hierarchical clustering. We evaluate the performance of clustering using different similarity measures on different types of datasets. We also present a heuristic to find communities in twitter that take advantage of the network characteristics of twitter