Linking Zetaproteobacterial diversity and substratum type in iron-rich microbial mats from the Lucky Strike hydrothermal field (EMSO-Azores observatory).

Zetaproteobacteria have been reported in different marine and terrestrial environments all over the globe. They play an essential role in marine iron-rich microbial mats, as one of their autotrophic primary producers, oxidizing Fe(II) and producing Fe-oxyhydroxides with different morphologies. Here, we study and compare the Zetaproteobacterial communities of iron-rich microbial mats from six different sites of the Lucky Strike Hydrothermal Field through the use of the Zetaproteobacterial operational taxonomic unit (ZetaOTU) classification.

Experimental degradation of helicoidal photonic nanostructures in scarab beetles (Coleoptera: Scarabaeidae): implications for the identification of circularly polarizing cuticle in the fossil record.

Scarab beetles (Coleoptera: Scarabaeidae) can exhibit striking colours produced by pigments and/or nanostructures. The latter include helicoidal (Bouligand) structures that can generate circularly polarized light. These have a cryptic evolutionary history in part because fossil examples are unknown.

Distraction Osteogenesis Using Bone Matrix Osteotensors in Ectodermal Dysplasia: A Case Report.

Introduction: Ectodermal dysplasia patients require complex oral rehabilitation. Bone matrix Osteotensors activate the patient's own stem cells to promote new bone formation through an autogenous growth factor cascade generated by a targeted flapless bone distraction before implant and/or bone graft therapy.

Materials And Methods: The maxillary and mandibular bone were activated 21 (for type I bone) to 45 days (for type IV bone) before implant and/or bone substitute installation.

[Radiation therapy for pleomorphic adenoma of the parotid].

Parotid pleomorphic adenoma is the most frequent tumor of salivary glands. The prognosis depends on the recurrences because they could lead to iatrogenic events (facial paralysis). Moreover the risk of malignant transformation increases with the number of local relapses.

The role of radiation therapy in pediatric mucoepidermoid carcinomas of the salivary glands.

Objective: To investigate the role of radiation therapy in rare salivary gland pediatric mucoepidermoid carcinoma (MEC).

Study Design: A French multicenter retrospective study (level of evidence 4) of children/adolescents treated for MEC between 1980 and 2010 was conducted.

Results: Median age of the 38 patients was 14 years.

Osteosarcomas of the mandible: multidisciplinary management of a rare tumor of the young adult a cooperative study of the GSF-GETO, Rare Cancer Network, GETTEC/REFCOR and SFCE.

Background: Mandibular osteosarcomas (MOS) mostly affect young adults. Their treatment is extrapolated from that of extragnathic osteosarcomas.

Material And Methods: A retrospective multicooperative group study was conducted to determine the impact of chemotherapy, adjuvant radiation therapy and surgery on outcomes and to identify prognostic factors.

[Juvenile ossifying fibroma: a misgiving tumor of the jaws].

Juvenile ossifying fibroma is a rare benign tumour of childhood. It is hardly distinguishable from others fibro-osseous lesions because of their overlapping microscopic features. Juvenile variant of ossifying fibroma may be mistaken for malignancy, particularly osteosarcoma.

[Revisiting the dose-effect correlations in irradiated head and neck cancer using automatic segmentation tools of the dental structures, mandible and maxilla].

Purpose: Manual delineation of dental structures is too time-consuming to be feasible in routine practice. Information on dose risk levels is crucial for dentists following irradiation of the head and neck to avoid postextraction osteoradionecrosis based on empirical dose-effects data established on bidimensional radiation therapy plans.

Material And Methods: We present an automatic atlas-based segmentation framework of the dental structures, called Dentalmaps, constructed from a patient image-segmentation database.

Compliance with fluoride custom trays in irradiated head and neck cancer patients.

Purpose: The purpose of this study is to assess compliance with fluoride gel custom trays in irradiated head and neck cancer patients.

Methods And Materials: One hundred fifty-five consecutive patients on remission following radiation therapy of head and neck cancers were assessed retrospectively for dental care practices prior to radiation and prospectively for long-term compliance with custom trays from November 2009 to January 2010. A five-item questionnaire was filled in by patients in the waiting room, and a 15-item questionnaire by the physician in charge during the corresponding follow-up visit.

Osteosarcomas of the mandible: are they different from other tumor sites?

Background: Osteosarcomas of the mandible (MOS) affect 1/10 million persons/year, mostly the young adult. Due to lack of specific data, the treatment of MOS is extrapolated from that of extragnathic OS but varies widely between institutions.

Materials And Methods: We aimed at providing a focused description of MOS histologies and grades through the English literature, at determining the evidence-based role of chemotherapy, of adjuvant radiation therapy and the potential of reconstructive surgery tailored through modern pre-operative multi-modal imaging.

L-PRP/L-PRF in esthetic plastic surgery, regenerative medicine of the skin and chronic wounds.

The use of platelet concentrates for topical use is of particular interest for the promotion of skin wound healing. Fibrin-based surgical adjuvants are indeed widely used in plastic surgery since many years in order to improve scar healing and wound closure. However, the addition of platelets and their associated growth factors opened a new range of possibilities, particularly for the treatment of chronic skin ulcers and other applications of regenerative medicine on the covering tissues.

Dentalmaps: automatic dental delineation for radiotherapy planning in head-and-neck cancer.

Purpose: To propose an automatic atlas-based segmentation framework of the dental structures, called Dentalmaps, and to assess its accuracy and relevance to guide dental care in the context of intensity-modulated radiotherapy.

Methods And Materials: A multi-atlas-based segmentation, less sensitive to artifacts than previously published head-and-neck segmentation methods, was used. The manual segmentations of a 21-patient database were first deformed onto the query using nonlinear registrations with the training images and then fused to estimate the consensus segmentation of the query.

[Enlarged marginal incision in rhinoplasty: an anatomic and clinic study].

Objective: This study is an evaluation of technical feasibility and clinical results of the wide marginal rhinoplasty.

Materials And Methods: A wide marginal approach has been used in remodeling and positioning cartilage grafts in 13 cadavers. The clinical study was focused on 20 patients with aesthetics indications and no functional need.

Usefulness of oral cytopathology in the diagnosis of infectious diseases.

In recent years, the incidence of oral opportunistic infections has increased, partly due to the widespread implementation of organ and bone marrow transplantation and the increase in the prevalence of human immunodeficiency virus (HIV) infection. Cytology can be used as a rapid, inexpensive and simple routine procedure in diagnosing infectious diseases of the mouth. Moreover, ancillary methods can be applied to cytological samples, increasing the specificity and sensitivity for the diagnosis of infectious diseases.

Immediate functional loading of an implant-supported fixed prosthesis at the time of ablative surgery and mandibular reconstruction for squamous cell carcinoma.

The authors describe a case of squamous cell carcinoma of the oral cavity managed by ablative surgery, mandibular reconstruction with a fibula free flap, and implant placement during the same session. Immediate functional implant loading, respecting the principles of basal implantology, was performed 48 hours later using a highly rigid, screw-secured fixed prosthesis that served as an external fixator for the implants and grafted bone. Implant loading before external beam radiotherapy improves flap stability, bone consolidation, and quality of life.

Determination of Young's modulus of mandibular bone using inverse analysis.

Development of a numerical model applicable to clinical practice, and in particular oral implantology, requires knowledge of the mechanical properties of mandibular bone. The wide range of mechanical parameters found in the literature prompted us to develop an inverse analysis method that takes into account the exact geometry of each specimen tested, regardless of its shape. The Young's modulus of 3000MPa we determined for mandibular bone using this approach is lower than the values reported in the literature.

[Teeth and irradiation in head and neck cancer].

Pre-irradiation dental care depends on teeth health, fields and dose of irradiation, compliance to fluorides, cessation of tobacco and psychosocial cofactors. Dental care aims at preventing complications and preserving the quality of life (eating, speech and aesthetics). Approximately 11% of patients do not require any pre-irradiation dental care.

In vitro effects of Choukroun's PRF (platelet-rich fibrin) on human gingival fibroblasts, dermal prekeratinocytes, preadipocytes, and maxillofacial osteoblasts in primary cultures.

Objectives: The objective of this study was to analyze the effects of Choukroun's PRF (platelet-rich fibrin), a leucocyte and platelet concentrate clinically usable as fibrin membrane or clot, on human primary cultures of gingival fibroblasts, dermal prekeratinocytes, preadipocytes, and maxillofacial osteoblasts.

Study Design: For the proliferation study, these cells were cultivated with or without a PRF membrane originating from the same donor as for the cells. For osteoblasts and fibroblasts, dose-dependent effect was assessed (using 2 membranes).

[Contribution of the finite element method in maxillofacial surgery].

The finite element method is a numerical modeling tool used in various fields in medicine and surgery such as orthopedics, traumatology, and cardiovascular surgery. But this tool also has several applications in maxillofacial surgery. We present the advantages of this method by describing its principles as well as the various fields of application in maxillofacial surgery.

[Betel quid and oral cancer: case report].

Betel quid chewing is a major cause of oral cancers in Asia. Practitioners must be able to recognize premalignant lesions. Cessation of betel quid use and preventive treatment must be recommended.

[The superior pedicled platysma-myocutaneous flap].

Introduction: The platysma-myocutaneous flap is a surgical procedure little used in oral and oropharyngeal reconstruction after malignant tumor resection. However, it provides a fast solution of reconstruction in specific indications, with functional and esthetic results comparable to other methods.

Anatomy: The platysma covers the anterolateral area of the neck and constitutes a part of the superficial musculoaponevrotic system of the head and neck.

Primary clear cell meningioma of the orbit mimicking a metastatic carcinoma: usefulness of immunohistochemistry and cytogenetic analysis.

Clear cell meningiomas (CCM) are rare tumors of the nervous system that usually occur in young patients and display high recurrence rates and potentially aggressive behavior. In this report, we describe a primary CCM of the orbit in an 84-year-old man with a previous history of a clear cell carcinoma of the kidney. Histologically, the tumor demonstrated a sheet-like proliferation of clear polygonal cells.

[Maxillar osteonecrosis associated with bisphosphonate treatment and dental implants].

Introduction: Bisphosphosnates are reference products used to treat osteoporosis, malignant bone disease, Paget's disease, and hypercalcemia. However these drugs seem to induce osteonecrosis of the jaws. This osteonecrosis is frequently observed and must be evoked in patients presenting with oral ulceration under bisphosphonate therapy.

Diaphyseal fractures treated by polylactide and hydroxyapatite pins. Experimental study in rat.

In order to develop a biodegradable interlocking nail for fracture fixation, polylactic acid (PLA) pins and hydoxyapatite pins were implanted in the femoral bone in rats. A distal fracture was performed. The union and the tissue reaction to PLA and hydroxyapatite versus stainless steel rods were studied after 15 days, 1, 2 and 6 months implantation.