Squamous cell carcinoma (Marjolin's ulcer) in an orocutaneous fistula of a large mandibular ameloblastoma: a case report

<p>Abstract</p> <p>Introduction</p> <p>Ameloblastomas are rare lesions constituting 1% of all jaw tumors. Oral squamous cell carcinomas are common lesions; these constitute about 90% of all oral cancers. Concurrent tumors consisting of ameloblastoma and squamous cell carcinoma are extremely rare.</p> <p>Case presentation</p> <p>This case report describes a 35-year-old African man who presented with a large mandibular tumor with an orocutaneous fistula that was found to be an ameloblastoma on histopathological examination, with concurrent squamous cell carcinoma histology within the fistula. This presentation was consistent with a Marjolin's ulcer within an ameloblastoma.</p> <p>Conclusion</p> <p>Ameloblastomas and Marjolin's ulcers require different management strategies. Careful histopathological examination of surgical specimens is key to patient outcome, as treatment of these patients depends on an accurate diagnosis.</p

QCD and strongly coupled gauge theories : challenges and perspectives

We highlight the progress, current status, and open challenges of QCD-driven physics, in theory and in experiment. We discuss how the strong interaction is intimately connected to a broad sweep of physical problems, in settings ranging from astrophysics and cosmology to strongly coupled, complex systems in particle and condensed-matter physics, as well as to searches for physics beyond the Standard Model. We also discuss how success in describing the strong interaction impacts other fields, and, in turn, how such subjects can impact studies of the strong interaction. In the course of the work we offer a perspective on the many research streams which flow into and out of QCD, as well as a vision for future developments.Peer reviewe

The oral health status of residents with different cognitive and dental‐related functions in three North Carolina assisted living facilities

Introduction The aim of the study was to describe the oral health status of persons with different cognition and dental‐related functions (DRFs). Methods The present study was a secondary analysis of data collected for a cross‐sectional study of residents in three assisted living facilities in North Carolina. The participants were aged 50 years or older, had normal to severely impaired cognition and spoke English. Upon obtaining informed consent, an oral assessment was completed by a trained geriatric dentist. A research team member who was blind to the oral examination outcomes then used the Minimum Data Set Cognition Scale to assess participants’ cognition and the dental activities test to evaluate oral self‐care and other DRFs. Descriptive statistics were used to describe the demographic, cognitive, functional and oral health status of the study participants. The impacts of cognitive and functional status on oral health measures were examined using simple linear regression models, negative binomial and zero‐inflated negative binomial models. Results A total of 91 long‐term residents from three long‐term care facilities participated in the study. Oral hygiene and gingival health were significantly associated with cognition (P = 0.056 and P = 0.017, respectively) and DRFs (P = 0.013 and P = 0.008, respectively). Residents with poor cognitive and dental‐related function also presented with poor oral hygiene and gingival health. Conclusion The study results suggest that oral hygiene and gingival health were significantly associated with cognition and DRFs