Idiopathic radiographic apical root resorption in wind instrument players

Root resorption of the permanent teeth involves an elaborate interaction among inflammatory cells resulting in loss of dental hard tissues. This report describes three clinical cases where idiopathic root resorption occurred in wind instrument playing patients. These patients produce adequate non-orthodontic forces, while playing their instruments, to expose their teeth to root resorbing force. Careful clinical monitoring of patients' teeth should be undertaken, as the additive effects of orthodontic treatment and musical habits are unknown

Standardless PIXE analysis of thick biomineral structures

The particle-induced X-ray emission (PIXE) of thick biomineral targets provides pertinent surface analysis, but if good reference materials are missing then complementary approaches are required to handle the matrix effects. This is illustrated by our results from qualitative and semiquantitative analysis of biomaterials and calcified tissues in which PIXE usually detected up to 20 elements with Z > 14 per sample, many at trace levels. Relative concentrations allow the classification of dental composites according to the mean Z and by multivariate statistics. In femur bones from streptozotocin-induced diabetic rats, trace element changes showed high individual variability but correlated to each other, and multivariate statistics improved discrimination of abnormal pathology. Changes on the in vitro demineralization of dental enamel suggested that a dissolution of Ca compounds in the outermost layer results in the uncovering of deeper layers containing higher trace element levels. Thus, in spite of significant limitations, standardless PIXE analysis of thick biomineral samples together with proper additional procedures can provide relevant information in biomedical research

The refinement calculus of reactive systems toolset

| openaire: EC/H2020/730080/EU//ESROCOSWe present the Refinement Calculus of Reactive Systems Toolset, an environment for compositional modeling and reasoning about reactive systems, built on top of Isabelle, Simulink, and Python.Peer reviewe

Considerations on the Effects of Two Implant Mandibular Overdenture on the Opposite Maxillary Complete Denture

The purpose of this study was to evaluate the clinical consequences of using two implants for mandibular denture retention, on occlusion and opposite maxillary complete denture, as well as on oral structures in the morpho-functional aspect. Material and Methods: The study group (n = 28) consisted of complete edentulous patients treated with mandibular two implant overdenture and complete conventional maxillary denture, with an age between 52-83 years, 20 women and 8 men followed for a period of 6 month. The assessment was made subjectively using questionnaires, and also objective by clinical examination of occlusal relationships and denture retention and stability. Subjectively, it was assessed the patients perception on masticatory function, comfort with maxillary denture and their opinion on the upper denture adaptation. Objective, clinical check-ups were conducted regularly, on the denture balance and occlusal relationships. Also, all the complications regarded the maxillary denture was recorded. Results: Subjectively, after a period of 6 month, most patients perceived a decrease of maxillary denture stability. Clinical observations suggests that the combination of the two types of prosthesis can lead, in some conditions, to an impaired maxillary denture balance, with anterior displacement of the masticatory field, resulting in increased load on the anterior maxillary ridge, affecting the relationship between the prosthesis and the support structures. Conclusion: With regard to the possible occlusal changes and their implications in maxillary denture balance, to diminish any traumatic effects on the maxillary ridge, the treatment planning should consider periodically control sessions consisting in occlusion rehabilitation interventions for preventing concentration of the masticatory pressure in the anterior maxillary ridge