Chemical Imaging of Carbide Formation and Its Effect on Alcohol Selectivity in Fischer Tropsch Synthesis on Mn-Doped Co/TiO Pellets.

X-ray diffraction/scattering computed tomography (XRS-CT) was used to create two-dimensional images, with 20 μm resolution, of passivated Co/TiO/Mn Fischer-Tropsch catalyst extrudates postreaction after 300 h on stream under industrially relevant conditions. This combination of scattering techniques provided insights into both the spatial variation of the different cobalt phases and the influence that increasing Mn loading has on this. It also demonstrated the presence of a wax coating throughout the extrudate and its capacity to preserve the Co/Mn species in their state in the reactor.

Tuning the Size of TiO-Supported Co Nanoparticle Fischer-Tropsch Catalysts Using Mn Additions.

Modifying traditional Co/TiO-based Fischer-Tropsch (FT) catalysts with Mn promoters induces a selectivity shift from long-chain paraffins toward commercially desirable alcohols and olefins. In this work, we use gas cell scanning transmission electron microscopy (STEM) with energy-dispersive X-ray spectroscopy (EDS) elemental mapping, and near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) to demonstrate how the elemental dispersion and chemical structure of the as-calcined materials evolve during the H activation heat treatment required for industrial CoMn/TiO FT catalysts. We find that Mn additions reduce both the mean Co particle diameter and the size distribution but that the Mn remains dispersed on the support after the activation step.

Plasma Cell Gingivitis: Clinical and Pathological Case Report.

Introduction: Plasma cell gingivitis (PCG) is a rare benign condition usually found on marginal and attached gingiva. This case details a generalized PCG, to include the management of the patient and clinicopathologic characteristics of the disorder.

Case Presentation: The patient, a 24-year-old African American female, was referred to the periodontics clinic for severe generalized gingival erythema and edema.

Influence of splenic flexure mobilization on postoperative and oncological outcomes following anterior resection.

Background: Splenic flexure mobilization (SFM) during anterior resection is often debated given its increased operative complexity and lack of clear data suggesting oncological benefit. This study aimed to compare postoperative complications and 3-year oncological outcomes in patients undergoing anterior resection with and without SFM.

Methods: A retrospective single center observational study was performed.

Prader-Willi syndrome: Periodontal-prosthodontic rehabilitation in an adult patient.

Introduction: Prader-Willi syndrome (PWS) is a rare genetic multisystemic disease that is the most common inherited cause of severe childhood obesity. PWS patients are prone to significant oral and systemic health issues that detrimentally affect quality of life and decrease longevity. This report documents full-mouth pre-prosthetic surgical and restorative care in an adult PWS patient.

General hospital outbreak of invasive candidiasis due to azole-resistant Candida parapsilosis associated with an Erg11 Y132F mutation.

An increasing number of outbreaks due to resistant non-albicans Candida species have been reported worldwide. Between 2014 and 2016, Candida isolates causing invasive candidiasis were recovered in a Mexican hospital. Isolates were identified to species level and antifungal susceptibility was determined.

Resolution of Abfraction-Associated Gingival Fenestration Utilizing Connective Tissue Grafting.

Introduction: Gingival fenestration (GF) is a distinct clinical entity of uncertain etiology that is seldom documented in the literature. It has been associated mainly with submucosal mechanical irritants such as calculus that subsequently create an opening in the oral soft tissue, usually at facial anterior sites. Surgical correction may be indicated to address functional and/or esthetic concerns.

The influence of vitamin D supplementation on local and systemic inflammatory markers in periodontitis patients: A pilot study.

Objectives: Vitamin D deficiency/insufficiency is a worldwide public health issue that has been linked to numerous inflammatory disorders, including periodontitis. There is increasing support for a role for adequate vitamin D levels in overall health. Populations with darker skin color have a higher prevalence of vitamin D deficiency/insufficiency and periodontitis.

Enhancing Periodontal Regenerative Outcomes With Simultaneous Orthodontic Tooth Movement.

Periodontal regeneration of lost tissue, including periodontal ligament (PDL), cementum, and bone, has evolved with regard to surgical techniques, biomaterials, and growth factors. Simultaneous orthodontic therapy and periodontal surgical treatment has been documented previously and shown to enhance the regenerative outcome due to stimulation of the PDL by tooth movement. This combined strategy is becoming increasingly common as clinicians explore the capabilities of a collaborative approach.

Erbium, Chromium:Yttrium-Scandium-Gallium-Garnet Laser Effectively Ablates Single-Species Biofilms on Titanium Disks Without Detectable Surface Damage.

Background: Increasing evidence implicates biofilms, consisting of species such as Porphyromonas gingivalis (Pg), in the etiology of peri-implantitis. Multiple approaches to ablate biofilms on failing implants have been proposed and include use of lasers, most recently the erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser. The purpose of this study is to establish an in vitro single-species biofilm model on implant surfaces and determine power settings of the Er,Cr:YSGG laser that remove biofilm without causing physical damage to disks.

Lingual Gingival Cyst of the Adult.

Introduction: Gingival cysts of the adult (GCAs) are rare developmental soft tissue cysts usually found on the facial attached gingiva. Documented cases on the lingual aspect are extremely uncommon. This report details a lingual GCA along with distinguishing characteristics of this lesion.

Retrospective study on idiopathic bone cavity and its association with cementoosseous dysplasia.

Objective: The goal of this study was to reveal clinical and pathologic findings on idiopathic bone cavity lesions (IBC).

Study Design: A retrospective analysis of 20 IBC cases diagnosed from 2004 to 2014 from a university-based maxillofacial pathology service was performed and included all pertinent clinical, histologic, and radiographic findings.

Results: Eleven women (age = 36 ± 12.

Acute urinary retention and obstipation: a rare cause….

Tailgut cysts are rare congenital anomalies, believed to be remnants of the primitive embryonic hindgut. In addition to causing genitourinary and bowel obstructive symptoms, they have been reported to harbour occult adenocarcinoma. Varying positions of a tailgut cyst with respect to the rectum have also been reported in literature.

Transient hiccups associated with oral dexamethasone.

Hiccups, or singulata (hiccup is singultus), are commonly experienced by most people at one time or another and are usually brief and self-limiting. Although pharmacotherapeutic agents are not generally considered causal in the etiology of hiccups, many clinicians empirically associate episodic hiccups in their patients as being drug induced. The two classes of drugs most often cited as causing hiccups are corticosteroids and benzodiazepines.

Retrorectal hamartoma: A 'tail' of two cysts!

Retrorectal hamartomas or tail gut cysts are rare congenital anomalies most commonly seen in a retrorectal location; most common in middle aged women. This article describes the radiological appearance in two cases of tail gut cysts in males, one a child with a visible perianal swelling since birth and the other, a 72-year-old man with symptoms for one week. In both, the tailgut cysts were in a right perirectal location.

Influence of matrix-suspended demineralized bone on osseous repair using a critical-sized defect in the rat (Rattus norvegicus) calvarium.

Demineralized freeze-dried bone (DFDB) in matrix form must be rehydrated with a carrier medium which allows for easy manipulation during periodontal surgery. The purpose of this study was to evaluate how human DFDB suspended in a polyol matrix affects new bone formation in the rat calvarium critical-sized defect (CSD) model. Fifty-five adult male Harlan Sprague-Dawley rats were assigned to 1 of 5 treatment groups: polyol, 100% DFDB, 47% DFDB/polyol, 47% DFDB, or an unfilled control.

Gingival recession treatment with connective tissue grafts in smokers and non-smokers.

Background: Cigarette smoking can adversely affect the results of many periodontal procedures. The purpose of this study was to determine whether cigarette smoking affects wound healing of subepithelial connective tissue grafts.

Methods: Seventeen systemically healthy patients with 22 Miller Class I or II mucogingival defects were divided into a non-smoker group or smoker group.

The effect of residual calcium in decalcified freeze-dried bone allograft in a critical-sized defect in the Rattus norvegicus calvarium.

Demineralized freeze-dried bone allograft (DFDBA), a widely used graft material in periodontal regenerative procedures, is processed with hydrochloric acid in the attempt to expose proteins located within the bone matrixes that are capable of inducing new bone formation. However, the degree of DFDBA demineralization varies between tissue banks, which may have an effect on clinical regeneration. This study uses the critical-sized defect (CSD) model to evaluate the wound-healing response to the residual calcium of donor bone.

Effect of a hydroxyapatite tricalcium phosphate alloplast on osseous repair in the rat calvarium.

Background: Bony defects caused by periodontitis are often treated by regenerative therapy using autografts and/or allografts. Alloplasts, such as hydroxyapatite or ceramics, are also used as osteoconductive materials that serve as a scaffold for new bony ingrowth. The purpose of this study was to determine the effect of hydroxyapatite tricalcium phosphate (HA-TCP) on osseous repair in the rat calvarium.

Severe localized periodontal destruction associated with cervical cemental separation.

Cemental separations and tears are secondary etiological factors that may lead to rapid periodontal destruction if the lesion communicates with the oral cavity and allows bacterial invasion. Although many cemental tears that occur on proximal surfaces can be diagnosed radiographically, separations on the facial or lingual surface that cannot be detected on radiographs may present a diagnostic dilemma. This article describes a case of lingual cemental separation on a maxillary incisor, with subsequent successful surgical correction utilizing an osseous graft.

Perioral angioedema associated with angiotensin-converting enzyme inhibitor.

Background: Angioedema is a non-pruritic swelling usually limited to the skin and mucous membranes of the face and perioral soft tissues. It can be life threatening but usually is not, and can be managed with conservative medical treatment unless the airway is endangered. Recent reports suggest that angiotensin-converting enzyme (ACE) inhibitors can predispose and/or precipitate angioedema, with a predilection toward patients of African American ancestry.

In vivo effectiveness of a glycerol-compounded demineralized freeze-dried bone xenograft in the rat calvarium.

Background: Demineralized freeze-dried bone (DFDB) is commonly hydrated with sterile water into a paste-like consistency for improved clinical handling or reconstituted with biodegradable barriers, such as glycerol, to promote handling and wound stability following human periodontal surgery. The purpose of this study was to evaluate the in vivo effects of glycerol-compounded human DFDB on bone formation in the rat calvarial critical-sized defect (CSD) model.

Methods: Forty-eight adult male Harland Sprague-Dawley rats were assigned to one of four treatment groups: glycerol, DFDB, DFDB plus glycerol, or a non-grafted control, and placed into 8 mm calvarial CSDs.

Nicotine stimulates osteoclast resorption in a porcine marrow cell model.

Background: Combustible tobacco use is generally linked with accelerated periodontal bone loss and diminished post-surgical wound healing; however, the pathogenesis of this process at the cellular level remains unclear. Nicotine is known to affect human gingival fibroblast orientation, attachment, and beta1 integrin expression, yet little is known about its effects on osteoclasts, the cells most responsible for bone resorption. The purpose of this study was to determine the effects of physiologically relevant nicotine levels on porcine osteoclast function as measured by resorption of calcium phosphate.

Evaluation of a novel alloplast for osseous regeneration in the rat calvarial model.

Background: Alloplasts are inert foreign bodies acting as osteoconductive space maintainers during osseous wound healing. They may also function as carriers for growth factors that are known to enhance neovascularization and osteoinduction; human recombinant transforming growth factor beta (rhTGF-beta1) is one such factor. The purpose of this study was to evaluate di-vinyl styrene beads (DVSb) and rhTGF-beta1 effects on osseous regeneration in the rat calvaria critical-sized defect model.

External root resorption following partial-thickness connective tissue graft placement: a case report.

We report an unusual case of external root resorption (ERR) that developed in a 37-year-old black male approximately 1 year following routine partial thickness connective tissue graft surgery. The lesion was accessed via flap surgery, thoroughly root planed, and the mucoperiosteal flap replaced. The site healed uneventfully and the patient has been closely observed for over 1 year without symptoms or recurrence of the resorptive lesion and the affected tooth remained vital.