Three-Dimensional Printing of Graphene Oxide/Poly-L-Lactic Acid Scaffolds Using Fischer-Koch Modeling.

Accurately printing customizable scaffolds is a challenging task because of the complexity of bone tissue composition, organization, and mechanical behavior. Graphene oxide (GO) and poly-L-lactic acid (PLLA) have drawn attention in the field of bone regeneration. However, as far as we know, the Fischer-Koch model of the GO/PLLA association for three-dimensional (3D) printing was not previously reported. This study characterizes the properties of GO/PLLA-printed scaffolds in order to achieve reproducibility of the trabecula, from virtual planning to the printed piece, as well as its response to a cell viability assay. Fourier-transform infrared and Raman spectroscopy were performed to evaluate the physicochemical properties of the nanocomposites. Cellular adhesion, proliferation, and growth on the nanocomposites were evaluated using scanning electron microscopy. Cell viability tests revealed no significant differences among different trabeculae and cell types, indicating that these nanocomposites were not cytotoxic. The Fischer Koch modeling yielded satisfactory results and can thus be used in studies directed at diverse medical applications, including bone tissue engineering and implants.

Distraction osteogenesis in Goldenhar Syndrome: case report and 8-year follow-up.

Goldenhar syndrome is a well-known condition featuring the following triad of anomalies: ocular abnormalities, microtia and vertebral anomalies. This syndrome involves structures arising from the first and second branchial arches. Craniofacial anomalies, including mandibular, zygomatic and/or maxillary hypoplasias are found in 50% of patients with Goldenhar syndrome. Patients with this syndrome may present unilateral or bilateral underdevelopment of the mandible. Several treatments for the correction of the dento-facial deformity have been described, among them distraction osteogenesis is one that shows promising results. Distraction osteogenesis is the process of bone formation that occurs during slow separation of the segments of bone after an osteotomy and it has been used to alleviate facial asymmetry. Mandibular distraction osteogenesis has been applied for many years, but long-term reports present controversial results. The purpose of the case report is to describe the immediate and long-term effects of distraction osteogenesis used to treat mandible asymmetry in a 5-year-old boy with Goldenhar syndrome.

Dental team management for a patient with Klippel-Feil syndrome: case report.

Klippel-Feil syndrome (KFS) is a rare congenital abnormality characterized by a short neck, a low posterior hairline, and limited head movement. Occasionally, patients with KFS may also show signs of deafness, intellectual disability, cardiac malformation, palpebral ptosis, facial nerve paralysis, cleft palate, and scoliosis. Although some researchers have documented this syndrome, scant attention has been paid to craniomaxillofacial manifestations and dental treatment of patients with KFS. The objective of this case report was to describe the planning and execution of dental treatment for a 10-year-old male patient with KFS.

Aplicação de técnica cirúrgica minimamente invasiva na instalação de implantes zigomáticos / Minimally invasive surgical approach for zygomatic implant placement

A reabilitação de maxilas atrófica é um grande desafio para cirurgiões e protesistas. Muitas técnicas têm sido propostas, dentre elas, o uso de implantes zigomáticos tem se mostrado eficiente e de baixa morbidade. O objetivo do presente artigo foi relatar um caso de implantes zigomáticos instalados através de cirurgia minimamente invasiva, reduzindo descolamento mucogengival e preservando os tecidos moles peri-implantares.

Rehabilitation of atrophic maxillae is a challenge to surgeons and prosthodontics. Several techniques have been suggested, being zygomatic fixtures efficient and showing low morbidity. The aim of this paper is to report a case of one with zygoma fixtures inserted through a minimally invasive approach, reducing the need for mucogingival detachment and at the same time protecting the peri-implant soft tissue.

Distraçäo osteogênica: revisäo de literatura / Distraction osteogenesis: literature review

Este trabalho teve por finalidade fazer um levantamento da literatura especializada sobre a distraçäo osteogênica (DO). Embora a primeira publicaçäo na área odontológica data de 1973, só na década de 90 este método tornou-se mais popular. Desde entäo, vários autores realizaram estudos experimentais e aplicaram esta técnica clinicamente com a intençäo de melhorar os resultados das cirurgias convencionais e ortopédicas para o tratamento das deformidades faciais. Esta técnica está fundamentada em sólidos princípios biológicos e biomecânicos, amplamente estudados. Este procedimento tem demonstrado ser de grande utilidade nos casos de deformidades dentofaciais severas

Alteração da inclinação do plano oclusal em cirurgia ortognática / Alteration of the occlusal plane cant in orthognathic surgery

O presente estudo consiste na revisão da literatura sobre a manipulação do plano oclusal em cirurgia ortognática. A inclinação do plano oclusal pode ser aumentada por meio de rotação do complexo maxilomandibular no sentido horário, ou reduzida por meio de auto-rotação mandibular ou de rotação do complexo maxilimandibular no sentido anti-horário. Os três procedimentos são descritos, sendo discutidas suas indicações, efeitos estéticos e possíveis implicações sobre a função e morfologia das articulações temporomandibulares. O assunto é relevente para o ortodontista e para o cirurgião, uma vez que a alteração do plano oclusal pode influir de forma significativa no resultado estético e funcional do tratamento ortodôntico-cirúrgico das deformidades dentofaciais