Cranioplastia do Osso Frontal com a Utilização de Implantes Customizados através de Protótipo 3D: Relato de Caso / Frontal Bone Cranioplasty using Customized Implants through a 3D Prototype: Case Report

A cranioplastia para os tratamentos de defeitos ósseos cranianos tem como o seu principal objetivo a reconstrução tridimensional e funcional da calota craniana. As cirurgias assistidas por computador (CAS) vem sendo utilizadas desde os anos 90 de forma eficiente e trazendo melhorias e otimização nas abordagens cirúrgicas craniofaciais reconstrutivas, principalmente em grandes defeitos ósseos. Este relato de caso clínico aborda o planejamento virtual e de tecnologia CAD/CAM na reconstrução craniofacial secundária com a utilização de polimetilmetacrilato (PMMA). Paciente de sexo masculino, 48 anos, apresentava dois defeitos ósseos em região frontal com deiscência da pele para dentro do seio frontal. Foi realizada uma tomografia computadorizada com cortes de 1mm e convertidos em um modelo 3D do osso frontal e no molde do defeito ósseo em tamanho real. Para abordagem dos defeitos ósseos, houve a participação de um neurocirurgião para o tratamento em dura-máter, cranialização do seio frontal e obliteração do ducto naso-frontal, sendo finalizada pela equipe de cirurgia bucomaxilofacial. Após a cirurgia, foi realizado um exame tomográfico sendo observados uma perfeita adaptação entre a prótese e os contornos ósseos e um ótimo contorno anatômico do osso frontal, tornando-se satisfatório ao planejamento cirúrgico inicial. A utilização de um planejamento virtual e do sistema CAD/CAM resultou em uma maior previsibilidade e maior segurança ao procedimento de reconstrução craniofacial além de redução do tempo transoperatório. O material utilizado, o PMMA, apresentou-se como um material de fácil manipulação, baixo custo e com perfeita adaptação aos contornos ósseos.

Cranioplasty for the treatment of cranial bone defects has as its main objective the three-dimensional and functional reconstruction of the skull. Computer-assisted surgeries (CAS) have been used since the 1990s efficiently and bring improvements and optimization in reconstructive craniofacial surgical approaches, especially in large bone defects. This clinical case report addresses virtual planning and CAD/CAM technology in secondary craniofacial reconstruction using polymethylmethacrylate (PMMA). A 48-year-old male patient had two bone defects in the frontal region with skin dehiscence into the frontal sinus. A computed tomography was performed with 1mm slices and converted into a 3D model of the frontal bone and in the mold of the bone defect in real size. To address the bone defects, a neurosurgeon was involved in the treatment of dura mater, cranialization of the frontal sinus, and obliteration of the nasofrontal duct, and was completed by the oral and maxillofacial surgery team. After the surgery, a tomographic exam was performed, and a perfect adaptation between the prosthesis and the bone contours and a great anatomical contour of the frontal bone were observed, making it satisfactory to the initial surgical planning. The use of virtual planning and the CAD/CAM system resulted in greater predictability and greater safety for the craniofacial reconstruction procedure, as well as a reduction in the perioperative time. The material used, PMMA, presented itself as a material of easy manipulation, low cost, and with perfect adaptation to bone contours.Keywords: PMMA, Bone transplantation, Maxillofacial Prosthesis, Cranioplasty, Customized implants.

Artroplastia em Gap com Interposição de Fáscia de Temporal para o Tratamento de Anquilose de Articulação Temporomandibular: Relato de Caso / Gap Arthroplasty with Temporalis Fascia Interposition for the Treatment of Temporomandibular

A anquilose da articulação temporomandibular (ATM) é caracterizada pela união intracapsular do complexo disco-côndilo à superfície do osso temporal, podendo gerar restrição dos movimentos mandibulares e limitação de abertura bucal. São descritas ainda alterações como restrição da capacidade mastigatória, dificuldade de fonação e de uma adequada higiene bucal, além de dificuldade de interação social. O presente caso retrata um paciente feminino, 27 anos, com histórico de fratura de parassínfise e côndilo mandibular bilateral após trauma em 2014, evoluindo com anquilose da ATM direita, com abertura máxima de 13,27 mm. Para o tratamento do caso descrito, foi utilizado o acesso de Al-Kayat, coronoidectomia ipsilateral e ressecção de massa anquilótica em gap com interposição de retalho da fáscia do músculo temporal no lado direito. Após seis meses do procedimento cirúrgico, foi realizada uma nova tomografia da face na qual se observa ausência de lesões e de sinais de recidiva da anquilose e também foi observada a manutenção do espaço de lacuna feita pela ressecção óssea. O resultado satisfatório da técnica foi atribuído pela obtenção e estabilização de uma abertura bucal adequada, melhora da capacidade mastigatória e da fonação. Além do sucesso clínico, uma vantagem da técnica utilizada foi o baixo custo do procedimento por utilizar apenas interposição do músculo temporal sem uso de materiais aloplásticos. Além disso, a coronoidectomia ipsilateral associada foi suficiente para auxiliar na manutenção da abertura alcançada, não sendo necessária a coronoidectomia contralateral, o que minimizou o tempo operatório e a morbidade de mais um sítio cirúrgico acessado.

Ankylosis of the temporomandibular joint (TMJ) is characterized by the intracapsular union of the condyle- disc complex to the surface of the temporal bone, which can cause restriction of the mandibular movements and a limitation of a mouth opening. Alterations are also described as a restriction of masticatory capacity, difficulty in phonation and suitable oral hygiene, as well as difficulty in social interaction. A 27-year-old female patient with a bilateral history of parasymphysis and mandibular condyle fracture after a trauma in 2014, which evolved to an ankylosis of the right TMJ, with a maximum mouth opening of 13.27 mm. For the treatment of the described case, it was used the Al- Kayat approach, ipsilateral coronoidectomy and resection of the ankylotic mass in gap with interposition of temporalis muscle fascia flap on the right side. After six months of the surgical procedure, it was made a new computed tomography of the face in which it was possible to notice the absence of lesions and signs of recurrence of the ankylosis. It was also observed the maintenance of the gap space made by the bone resection. The satisfactory result of the technique was attributed to the achievement and stabilization of an adequate mouth opening, improved chewing ability and phonation. Besides the clinical success, an advantage of the technique used was the low cost of the procedure by using only temporal muscle interposition without the use of alloplastic materials. In addition, the associated ipsilateral coronoidectomy was sufficient to help maintaining the achieved mouth opening, and the contralateral coronoidectomy was not necessary, as a result it was minimized the surgical time and morbidity of one more accessed surgical site.

High Prevalence of a Newly Discovered Wutai Mosquito Phasivirus in Mosquitoes from Rio de Janeiro, Brazil.

Many RNA viruses have recently emerged, threatening humans and causing harm to animals and plants. Bunyaviruses represent one of the largest groups of RNA viruses and are able to infect a wide range of hosts (invertebrates, vertebrates, and plants). Recently, new insect-specific viruses have been isolated from mosquitoes and phlebotomine sandflies worldwide. Little is known regarding the impact of these viruses on the vector life cycles and the stages of oviposition, breeding, blood feeding, and the mosquito's lifespan. This study describes, for the first time in South America, the detection and characterization of a recently discovered bunyavirus corresponding to the Wutai mosquito phasivirus, confirming its high prevalence in the Culex spp. and Aedes spp. mosquitoes collected in the urban environment of Rio de Janeiro city, Brazil. The knowledge of the mosquito's insect-specific virus infection can improve virus evolution studies and may contribute to the understanding of intrinsic factors that influence vector competence to transmit pathogenic viruses.

Primary Repair of a Complex Panfacial Fracture by Dog Bite.

Facial fractures due to dog attacks have an unknown incidence rate. To date, only 41 cases of canine bite trauma in a pediatric patient, associated with facial fracture, have been reported in the literature. As major species of involving dogs are the American pitbull terrier and rottweiler. Due to the intense kinematics of this trauma, the treatment becomes complex. Thus, attention to the primary repair of such complex lesions ensures satisfactory results, which is the focus of this discussion. The purpose of this review was to analyze how different ways to approach this type of trauma in children for clarification or correct management. In addition, we address the treatment plan of a complex case of panfacial fracture by a canine bite in a 4-year-old patient. According to a review addressed, the main involved are orbit, nasal, and zygomatic. Antibiotic therapy is indicated for infected bite wounds and wounded considerations at risk of infection, with high complexity and when involving important structures such as bones, vessels, and joints. The state of tetanus immunization and the risk of rabies infection should be routinely addressed in the management of the bite wound.

Juvenile Nasopharyngeal Angiofibroma With Sphenoid Sinus Invasion and Protrusion: Treatment Approach With Le Fort I Osteotomy.

Juvenile nasopharyngeal angiofibroma (JNA) is a rare benign tumor that occurs predominantly in young males. The authors report the case of a 22-year-old male patient who presented with a painless, exophytic tumor mass protruding through the right nostril, with anterior lateral extension associated with severe posterior involvement, erosion of the sphenoid bone to the right of the pterygoid process, and significant epistaxis. The preoperative evaluation, surgical approach, postoperative results, and a review of the literature are presented. The surgical approach with Le Fort I osteotomy was designed to facilitate surgical access to the tumor in the nasal cavity. Before down-fracture of the maxilla, plates were placed for fixation and holes were made to produce reference points for restoration of normal anatomy after tumor removal. Although the literature describes the use of nonsurgical therapies, it is well established that surgical treatment is the best option for patients with JNA. Treatment also requires preoperative embolization to avoid bleeding and ensure safety during tumor resection. Long-term imaging follow-up every 6 to 8 months for at least 3 years after surgery is needed for detection of residual tumor/recurrence. The modified technique used here together with preoperative embolization was essential to successful outcome.

Giant Peripheral Temporomandibular Osteoma With Immediate Reconstruction of Mandible.

Osteoma is a benign osteogenic tumor, which is characterized the slow-growing proliferation of compact or cancellous bone. The etiology of the lesion is not well established. Among the hypotheses, the following are related: a traumatic factor, infectious processes, or true neoplasm due to the origin of cartilaginous cells. It can present at any age, usually in young adult individuals, with equal prevalence in both sexes. The clinical characteristics of the peripheral osteoma are represented by slow asymptomatic growth, which leads to swelling and, thus, facial asymmetry. When it is related to the mandibular condyle, this growth can cause functional impairment, such as malocclusion, temporomandibular joint dysfunction, and even limited mouth-opening owing to ankylosis.