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Background Resin-based occlusal veneers are increasingly used within minimally invasive restorative dentistry. However, evidence remains limited regarding whether fabrication technique (subtractive milling versus additive 3D printing) influences clinically relevant surface characteristics particularly surface roughness and color stability after thermomechanical aging. Methods Eighteen resin occlusal veneers were fabricated from the same standardized digital design (STL) using NanoKsa G-Plus material and divided into two groups ( n  = 9): milled CAD/CAM and 3D-printed. Measurement of surface roughness (Ra) was performed utilizing a non-contact profilometer at baseline and after thermomechanical aging while Color change (ΔE) was assessed with a spectrophotometer (Vita Easyshade) sequentially: after coffee immersion (1 week) and then repeated again after thermomechanical aging. Thermomechanical aging combined thermocycling (5000 cycles) and chewing simulation (75,000 cycles) under standardized loading. Intergroup comparisons were performed using independent t-tests, with level of significance determined at p  ≤ 0.05 and 1.0 < ΔE*ab threshold range < 3.3 commonly reported clinically acceptable thresholds. Results At baseline, the 3D-printed group showed significantly greater roughness of surface than the milled group (Ra: 0.27 ± 0.007 vs. 0.24 ± 0.02; p  = 0.05). After thermomechanical aging, no significant difference was detected between groups (Ra: 0.26 ± 0.021 vs. 0.27 ± 0.016; p  = 0.50). For color change, the 3D-printed group demonstrated significantly greater ΔE than the milled group across all intervals, including baseline-to-post-staining (34.33 ± 6.14 vs. 13.14 ± 2.31; ` p  = 0.001) and post-staining-to-post-aging (18.78 ± 3.85 vs. 2.66 ± 1.89; ` p  < 0.001`). Conclusions Thermomechanical aging reduced differences in surface roughness between milled and 3D-printed resin occlusal veneers; however, 3D-printed specimens exhibited substantially higher discoloration after staining and aging. This may indicate that, despite comparable post-aging roughness, color stability may limit the clinical use of 3D-printed in situations where esthetics are critical indicating that their recorded stainability values exceeded commonly reported clinical acceptable thresholds.

The human brain is constantly exposed to air pollutants, some of which might be disruptive or even lethal to certain neurons implicated in abstract features of cognitive function. In this review, we present new evidence from behavioral and neural studies in humans, suggesting a link between indoor fine particulate matter and decision-making behavior. To illustrate this relationship, we use qualitative sources, such as historical documents of the Vietnam War to develop hypotheses of how aerial transmission of pollutants might obstruct alternative choices during the evaluation of policy decisions. We first describe the neural circuits driving decision-making processes by addressing how neurons and their cognate receptors directly evaluate and transduce physical phenomena into sensory perceptions that allow us to decide the best course of action among competing alternatives. We then raise the possibility that indoor air pollutants might also impact cell-signaling systems outside the brain parenchyma to further obstruct the computational analysis of the social environment. We also highlight how particulate matter might be pathologically integrated into the brain to override control of sensory decisions, and thereby perturb selection of choice. These lines of research aim to extend our understanding of how inhalation of airborne particulates and toxicants in smoke, for example, might contribute to cognitive impairment and negative health outcomes.

Humans live under constant threat from pathogenic microorganisms and minimizing such threat has been a major evolutionary selective force in shaping human behavior and health. A particular adaptive mechanism against the harm caused by parasites and their infectiousness is disgust sensitivity, which has evolved to detect and avoid poisonous foods as well as bodily secretions harboring virulent microorganisms. This ubiquitous and reflexive behavior requires the integration of several internal and external sensory signals between the brain, the autonomic nervous system (ANS), and the gastrointestinal tract. Although the emotional expression of disgust is experienced by almost all individuals, the neural mechanisms of sensory signals underlying disgust sensitivity may differ in certain psychiatric conditions. Psychopathy, for instance, is a personality disorder in which disgust sensitivity to contagious bodily secretions is apparently absent or downregulated from its atypical personality temperament. In this review, we provide convergent behavioral, anatomical, and cellular evidence to suggest that a fractured experience of disgust sensitivity might be an additional feature of psychopathic behavior. First, we discuss the neural networks of certain brain regions mediating the emotional states of disgust and then discuss the intersection of the ANS and gastrointestinal tract in the processing of disgust and its relevance to aberrant antisocial behavior. Together, this work highlights the interconnections between the brain and the bilateral body plan as an integrated cell network that is relevant for understanding common principles underlying function and dysfunction of disgust levels in psychiatric domains.

A 34-year-old man presented to the hospital with right-sided headache. He was diagnosed with GBM. He underwent resection of the tumor with placement of carmustine impregnated wafers. Then he underwent adjuvant chemotherapy with temozolamide. Before the completion of chemotherapy he had a recurrence. He underwent re-resection with placement of carmustine impregnated wafers. Subsequently he had eighteen cycles of salvage biochemotherapy with bevacizumab and irinotecan. To date, routine MRI scans of the brain have not shown evidence of recurrence. He continues to be in remission three years after treatment with bevacizumab and irinotecan.

Complex interactions between gene variants and environmental risk factors underlie the pathophysiological pathways in major psychiatric disorders. Autism Spectrum Disorder is a neuropsychiatric condition in which susceptible alleles along with epigenetic states contribute to the mutational landscape of the ailing brain. The present work reviews recent evolutionary, molecular, and epigenetic mechanisms potentially linked to the etiology of autism. First, we present a clinical vignette to describe clusters of maladaptive behaviors frequently diagnosed in autistic patients. Next, we microdissect brain regions pertinent to the nosology of autism, as well as cell networks from the bilateral body plan. Lastly, we catalog a number of pathogenic environments associated with disease risk factors. This set of perspectives provides emerging insights into the dynamic interplay between epigenetic and environmental variation in the development of Autism Spectrum Disorders.

Tumors of salivary glands are uncommon and comprise of about 2%–4% of all head and neck tumors. About 75%–80% of these tumors are benign and include pleomorphic adenoma, monomorphic adenoma, oncocytoma, and papillary cystadenoma lymphomatosum. Mucoepidermoid carcinoma is the most common malignant tumor of salivary glands, representing 5–10% of all salivary gland tumors. Although known to be metastatic to local lymph nodes, distant metastases are rare (especially, with low and intermediate grade tumors). Histologic grade and the expression of various mucin glycoproteins are useful prognostic indicators. We present a case of mucoepidermoid carcinoma of parotid gland origin with distant metastases which is an uncommon occurrence with intermediate grade tumors. Also, this is the first reported case of humoral hypercalcemia of malignancy secondary to mucoepidermoid carcinoma.

An estimated 95-97% of Parkinson's disease (PD) cases are idiopathic, emphasizing the absence of a clear etiologic linkage for this debilitating, neurodegenerative, and progressive motor disease. Increasing evidence suggests a peripheral disease origin and the gradual transition of a pathological process along the gut-brain axis and olfactory routes into the brain. This disease pattern is reminiscent of an infectious process and suggests the presence of one or multiple infectious agents, such as bacteria, viruses, fungi, or prion-like proteins. This unusual paradigm, known as Braak's hypothesis, was first described by the scientist who developed the staging standard for cellular PD pathology and. Here, we describe a case where the small, anaerobic, Gram-positive Cutibacterium acnes was recurrently isolated from intraoperative spinal tissues in a patient with early-onset PD. C. acnes is also the bacterium that we previously isolated from cadaveric PD brain tissue. Both observations are consistent with Braak's hypothesis underscoring the importance of homeostasis and maintained immune-competence for healthy aging of the body and mind.An estimated 95-97% of Parkinson's disease (PD) cases are idiopathic, emphasizing the absence of a clear etiologic linkage for this debilitating, neurodegenerative, and progressive motor disease. Increasing evidence suggests a peripheral disease origin and the gradual transition of a pathological process along the gut-brain axis and olfactory routes into the brain. This disease pattern is reminiscent of an infectious process and suggests the presence of one or multiple infectious agents, such as bacteria, viruses, fungi, or prion-like proteins. This unusual paradigm, known as Braak's hypothesis, was first described by the scientist who developed the staging standard for cellular PD pathology and. Here, we describe a case where the small, anaerobic, Gram-positive Cutibacterium acnes was recurrently isolated from intraoperative spinal tissues in a patient with early-onset PD. C. acnes is also the bacterium that we previously isolated from cadaveric PD brain tissue. Both observations are consistent with Braak's hypothesis underscoring the importance of homeostasis and maintained immune-competence for healthy aging of the body and mind.

SiMo ductile cast irons are used as high-temperature materials in automotive components, because they are microstructurally stable at high operating temperatures. The effect of different amounts of Si and Mo as well as the addition of 3 wt pct Al on the microstructure, high-temperature oxidation, and mechanical properties of SiMo ductile cast iron was studied. Dilatometric measurements of SiMo ductile iron exhibited obvious differences in the transformation temperature A 1 due to presence of Al and the increase of Si. The microstructure of the SiMo alloys without Al addition showed outstanding nodularity and uniform nodule distribution. However, by adding 3 wt pct Al to low Si-SiMo ductile iron, some compacted graphite was observed. The results of oxidation experiments indicated that high Si-SiMo ductile iron containing 4 and 4.9 wt pct Si had superior resistance to lower Si-SiMo and SiMo ductile iron containing 3 wt pct Al. The results showed also that with increasing Si up to 4.9 wt pct or by replacing a part of Si with 3 wt pct Al, tensile strength increased while elongation and impact toughness decreased.