• Myosite ossifiante du muscle temporal après polytraumatisme
    Vol 6 No 1 (2019)

    Myositis ossificans traumatica (MOT) of the temporal muscle is an extremely rare disease. A limitation of mouth opening is a key symptom. Imaging is very useful for diagnosis. The computed tomography scanner of the face is the most efficient for the detection of the MOT. Complete surgical resection is the best treatment. Cases of MOT in the head and neck area are rare. Cases of isolated temporal muscle involvement are even rarer. We present the case of an isolated ossification of the left temporal muscle after polytrauma. The interest of the clinical observation of the case presented is thus to document the literature. The differential diagnosis and pathognomonic signs present on the imaging examinations will also be detailed.

  • Quality assessment of instructions for authors in dental, oral and maxillofacial journals
    Vol 5 No 1 (2019)

    Objective: to develop and test inter-observer reproducibility of instructions for authors quality rating (IAQR) tool measuring the quality of instructions for authors at journal level for a possible improvement of editorial guidelines. 
    Material and methods: instructions for authors of 75 dental and maxillofacial surgery journals were assessed by two independent observers using assessment tool inspired from AGREE with 16 questions and 1 to 4 points scale per answer. Two observers evaluated the instructions of authors independently and blind to impact factor of a given journal. Scores obtained from our tool were compared 
    with “journal impact factor 2013”. 
    Results: IAQR presented with an excellent interobserver reproducibility (κ= 0.81) despite a difference in data distribution between observers. There existed a weak positive correlation between IAQR and “journal impact factor 2013”. 
    Conclusions: The IAQR is a reproducible quality assessment tool at the journal level. The IAQR assess the quality of instruction for authors and it is a good starting point for possible improvements of the instructions for authors, especially when it comes to their completeness. 
    Nemesis relevance: 28% of dental and maxillofacial journals might revise their instructions for authors to provide more up-to-date version.

  • Paget’s disease of bone, biphosphonates and jaw osteonecrosis: a case report
    Vol 4 No 1 (2019)

    Objective: Paget’s disease of bone is characterized by a focal increase in bone resorption and accelerated bone formation leading to a weaker and disorganised bone. Bisphosphonates (BPs) have been the treatment of choice of Paget’s disease since the 1990s. Medication related osteonecrosis of the jaw (MRONJ) is a rare event in non oncologic patients. We describe a rare case of  Paget’s disease involving the maxilla with osteonecrosis in a context of bisphosphonate treatment.

    Case report: an 87-year-old woman presented with 4 episodes of bone necrosis in 15 years. In this case report there is a clear chronologic association between the occurrence of MRONJ and the administration of iv BP for Paget’s disease.

    Maxillofacial involvement of Paget’s disease occurs in less than 15% of cases. There is a lack of information in the literature about the association of MRONJ and Paget’s disease. Even if osteonecrosis of the jaw could be a consequence of the disease, in this case, it is more in relation to the BP treatment.

    Conclusions: Although MRONJ might be considered a rare condition in Paget’s disease, patients prior to starting antiresorptive therapy and in particular iv BPs should have a complete dental examination and panoramic X-Ray.

    Nemesis relevance: side effect of bisphosphonate treatment


  • 3D printed cylinders used for cytotoxicity determination tests. A. Before coating with 2-octyl-cyanoacrylate; B. After coating with 2-octyl-cyanoacrylate (by courtesy, Prof Leszek Klimek, Medical University of Lodz, Poland) Cytotoxicity of three-dimensional paper-based models from a three-dimensional paper-based printer
    Vol 3 No 1 (2018)

    Objective: Our study aimed to determine the possibility of using models created with a low-cost, paper based 3D printer in an operating room. Therefore influence of different methods of sterilization on models was tested and cytotoxicity of generated models was determined.

    Material and methods: 30 cuboids divided into three groups were used for verification of shape stability after sterilization. Each group was sterilized either with: Ethylene oxide in temperature 55˚C, Hydrogen peroxide gas plasma in temperature 60˚C or Gamma irradiation at 21˚C, 25kGy. Each cuboid was measured using calliper three times before and three times after sterilization. Results were analysed statistically in Statgraphics Plus. Statistical significance was determined as p< 0.05. Sixty cylinders divided into six groups were used for cytotoxicity tests. Three of those groups were covered before sterilization with 2-octyl-cyanoacrylate. Each group was sterilized with one of the previously described methods. Cytotoxicity was tested by Nanostructural and Molecular Biophysics Laboratory in Technopark Lodz using normal adult human dermal fibroblasts. Survival of cells was tested using spectrophotometry with XTT and was defined as ratio of absorbency of tested probe to absorbency of control probe. Calcein/Ethidium dyeing test was performed according to LIVE/DEAD Viability/Cytotoxicity Kit protocol. Observation was done under Olympus GX71 fluorescence microscope. Results: There was no statistically significant difference for established statistical significance p=0.05 in cuboids dimensions before and after sterilization regardless of sterilization method. In XTT analysis all samples showed higher cytotoxicity against normal, human, adult dermal fibroblast culture when compared to positive control. ANOVA statistical analysis confirmed that 2-octyl cyanoacrylate coating of paper model improved biological behaviour of the material. It decreased cytotoxicity of the model independently of sterilization method. In calcein/ethidium dyeing test due to the high fluorescence of the background caused by cylinders of analysed substance it was impossible to perform the exact analysis of the number of marked cells.

    Conclusions: Acquired results allow to conclude that Mcor Technology Matrix 300 3D paper-based models can be used in operating room only if covered with cyanoacrylate tissue adhesive.

    Nemesis relevance: no statistically significant difference in cuboids dimensions before and after sterilization regardless of sterilization method. Presence of high cytotoxicity of 3D paper-based models without coating.

  • Three-dimensional analysis of airway space and mandibular morphology in Pierre Robin sequence using cone beam computed tomography.
    Vol 2 No 1 (2018)

    Objectives: The Pierre Robin sequence (PRS) is defined by retromicrognathia, glossoptosis, and sleep apnea and can also be associated with cleft palate. Diagnosis, management and mandibular catch-up growth are still controversial issues in PRS patients. The aim of our retrospective study was to evaluate in three dimensions (3D) the airway space and mandibular morphology in PRS compared to a normal control group patients in the pre-orthodontic period of life. The null hypothesis was that we would not find a significant difference between the PRS and control group patients in oropharyngeal airway volume measurements. Material and methods: We analyzed 9 PRS patients (mean age: 8 years-old) who underwent cleft palate surgery in the first four months of life, performed by the same surgeon using the same technique. Cone-beam computed tomography (CBCT) was performed in these patients after local ethical committee approval. The control group consisted of 15 patients (mean age: 9 years-old) with CBCT already performed for other reasons. 3D Slicer was used in both groups for semi-automatic segmentation of the airway space. Two independent observers performed semi-automatic segmentations twice in each patient with a one- week interval between the two series of measurements. Airway volume was automatically measured using 3D Slicer. We also developed a 3D cephalometric analysis with Maxilim software in order to define a 3D mandibular morphology which consisted of 25 landmarks, 4 planes, and 23 distances. Two independent observers performed the 3D cephalometric analysis twice for each patient, with a one- week interval between the two series of measurements. Results: There was no significant difference in the intra- and inter-observer measurements between the PRS and control groups for airway space volume (p<0.05). However, there was a significant difference in the shape of the mandible between the PRS group and the control group (p<0.05). Conclusions: Vertical ramus width and mandibular global anteroposterior length were significantly lower in the PRS group. Mandibular hypoplasia could be found in PRS patients not only in the horizontal dimension. Nemesis relevance: the null hypothesis was confirmed. Moreover we failed to find exactly the same control group under 9 years-old due to radioprotection restrictions of application of cone beam CT in children.

  • Pathologies osseuses des maxillaires récidivantes
    Vol 1 No 1 (2018)

    Maxillofacial bone diseases represent a heterogeneous group involving benign and malign tumors, and metabolic, malformative, and infectious diseases. They have a tendency to relapse even with a good initial treatment. Therefore, we need to start with active surveillance based on medical imaging (CT scanner). The treatment of maxillofacial bone diseases is based mainly on clinical examination, radiological findings, and pathological diagnosis. The treatment consists of curettage or maxillary/mandibulary interruptive or not-interruptive bone resection. Development of guidelines seems impossible due to the heterogenicity of clinical presentations. The individualized treatment should prevail.