Avaliação da fidelidade da referência externa em tecidos moles na cirurgia ortognática da maxila

Esse trabalho teve o objetivo de analisar a fidelidade da referência externa em tecidos moles no auxílio do posicionamento vertical da maxila. Foram selecionados 40 pacientes portadores de deformidade dentofacial e submetidos à osteotomia total da maxila. Os indivíduos foram divididos em 2 grupos no intuíto de avaliar duas técnicas de referência externa: a utilização da sutura em tecidos moles e o uso do fio de Kirschner. Esta última foi utilizada como a técnica do grupo-controle. Os dados foram colhidos em duas fases. Na primeira delas, foi realizada a mensuração da posição vertical da maxila antes da osteotomia Le Fort I e após a fixação da maxila, utilizando a referência externa. A partir desses números, foi obtida a alteração vertical de cada caso, colhida durante a cirurgia. Na segunda fase da coleta de dados, foram realizadas mensurações verticais da maxila baseadas nas radiografias cefalométricas pré e pós-operatórias. Assim, foi obtido o valor da alteração vertical de cada caso, baseado na documentação radiográfica. Após esta etapa, foi calculada a diferença entre a alteração vertical obtida durante a cirurgia e a alteração vertical colhida a partir das radiografias. Dessa forma, foram obtidos valores que correspondem às imperfeições no posicionamento vertical da maxila de cada paciente, tendo como base a posição do incisivo central superior. Os resultados foram comparados e analisados estatisticamente. A média aritmética da precisão no posicionamento vertical da maxila no grupo-controle foi de 0,52mm e do grupo da referência em tecidos moles foi de 0,65mm. A aplicação do teste t de Student a 5% revelou que não houve diferença estatística significativa entre o grau de precisão das duas técnicas de referência externa (P=0,429). Como conclusão, observou-se que as duas técnicas foram eficazes no auxílio ao posicionamento vertical da maxila e que a referência externa em tecidos moles apresentou um grau de precisão semelhante ao valor obtido com a técnica do fio de Kirschner.

Stability of Le Fort I maxillary inferior repositioning surgery with rigid internal fixation: a systematic review

The aim of this study was to evaluate the stability of Le Fort I maxillary inferior repositioning surgery in patients with a vertical maxillary deficiency at least 6 months after surgery. The electronic databases were searched to identify all articles reporting the long-term effects of one-piece maxillary inferior repositioning with rigid fixation. Methodological quality was evaluated according to 15 criteria related to study design, measurements, and statistical analysis. Two articles were identified, with a total of 22 patients. The maxilla was repositioned inferiorly from a mean 3.2 to 4.5mm in the anterior part and from a mean 0.1 to 1.8mm in the posterior part. At 6 months post-treatment, absolute relapse of a mean 1.6mm was measured for the anterior part of the maxilla and 0.3mm for the posterior part of the maxilla. The stability of maxillary inferior repositioning surgery could not be confirmed due to the small sample size, unclear diagnosis, and potential confounding factors.

Effect of different repair techniques on the accuracy of repositioning the fractured denture base

Objective:This study investigated the efficacy of different techniques for the union of fragments of a denture before repair and on the accuracy of the reposition.Materials and methods:For this study, 20 maxillary dentures made with Lucitone 550 heat-cured resin were used. Points were determined with a scanner on the cusp of the teeth, as a measurement of the segments. After digitisation, each model was exported to the AUTOCAD R 14 program and two-dimensional measurements of the distances between the marked points were made. After the initial analysis, the dentures were fractured into two segments using an impact test machine. For the repair, maxillary dentures were divided into two groups; in the first, the repair was carried out using Kerr's sticky wax and in the second group, Super Bonder was used to join the fragments, with subsequent inclusion of DENTSPLY((R)) Repair Material resin. After the repair, the points of the maxillary dentures were measured again. The numerical values obtained were tabulated to compare the measurements before fracture and after the repair. For statistical analysis, analysis of variance was employed, using a single factor and double factor, followed by the Tukey test with a reliability of 95%.Results:The results demonstrated a statistically significant difference between the materials used to join the dentures for repair, where the dentures were joined with sticky wax presented a larger variation in the distances between the points.Conclusion:The variation in distances between the points is influenced by the agent of repair.

Maxillary canine-first premolar transposition - Restoring normal tooth order with segmented mechanics

Tooth transpositions present at a relatively low incidence in the world population and primarily affect maxillary canines and premolars. Treatment of this disturbance should take into account aspects such as facial pattern, age, malocclusion, tooth-size discrepancy, stage of eruption, and magnitude of the transposition. Mechanics for correction should be entirely individualized, reducing the risks and adverse effects. Practitioners often select simpler options, indicating extraction of permanent teeth, which is an irreversible procedure that may bring about damages to the patient. This study presents a case report and treatment of unilateral transposition of maxillary canine and premolar with repositioning of affected teeth to their respective normal positions.

Influence of surgical repositioning of mature permanent dog teeth following experimental intrusion: a histologic assessment

The aim of this study was to evaluate, through histologic examination, the effect of surgical repositioning of intruded dog teeth upon the pulpal and surrounding tissues. Thirty teeth in 10 adult dogs, aged 2-3 years, were used. Fifteen teeth were intruded, surgically repositioned and fixed using orthodontics wire, composite resin, and enamel acid conditioning. All these teeth served as the experimental group. The remaining intruded teeth were not treated ( control group). The animals were sacrificed to allow observations at 7,15, and 30 post-operative days. The maxillary and mandibular archs were removed and processed for histologic exam. Based on the methodology and observed results, we concluded that: pulpal necrosis, external root resorption and ankylosis were common sequelae to severe traumatic intrusion; a careful immediate surgical repositioning of severed intruded permanent tooth with complete root formation has many advantages with few disadvantages.

Maxillary canine - First premolar transposition: Restoring normal tooth order with segmented mechanics

Tooth transpositions present at a relatively low incidence in the world population and primarily affect maxillary canines and premolars. Treatment of this disturbance should take into account aspects such as facial pattern, age, malocclusion, tooth-size discrepancy, stage of eruption, and magnitude of the transposition. Mechanics for correction should be entirely individualized, reducing the risks and adverse effects. Practitioners often select simpler options, indicating extraction of permanent teeth, which is an irreversible procedure that may bring about damages to the patient. This study presents a case report and treatment of unilateral transposition of maxillary canine and premolar with repositioning of affected teeth to their respective normal positions. © 2006 by The EH Angle Education and Research Foundation, Inc.

Severe fracture of the maxillary alveolar process associated with extrusive luxation and tooth avulsion: A case report

Aim: The aim of this report is to present a case of severe fracture of the maxillary anterior alveolar process with substantial bone dislodgement associated with extrusive tooth luxation and avulsion. Background: Dentoalveolar trauma is a challenge to dentistry, especially in young patients, for it can lead to early tooth loss which compromises oral function, esthetics, self-esteem, and alter the long-term plan of care for the victim. Case Report: A 12-year-old girl with severe dentoalveolar trauma to the maxillary anterior region presented for emergency care for her injury. Treatment consisted of fracture reduction of the alveolar process, repositioning of the teeth that had suffered extrusive luxation, placement of a semi-rigid splint, and suturing of soft tissue lacerations. The traumatized teeth presented with pulpal necrosis and were treated endodontically. After 24 months of follow up, the fracture of the alveolar process was completely healed and the displaced teeth presented no signs of ankylosis or root resorption. Summary: First-aid care contributed remarkably to this case allowing the re-establishment of esthetics, function, and patient's self-esteem. In spite of trauma extension the treatment outcomes were favorable. Clinical Significance: Cases of dentoalveolar trauma should be evaluated on an individual basis. However, early emergency management and adequate follow-up can prevent further complications and contribute to treatment success.

Treatment of traumatic dental intrusion by surgical repositioning: clinical case report

The prevalence of dental trauma and its consequences are challenging. This article presents a clinical case of a 9-year-old female who was in a bicycling accident and had a dental intrusion of the left maxillary lateral incisor with extensive dislocation. In the emergency department, surgical repositioning of the intruded tooth and a splinting with steel wire and composite resin was performed and the soft-tissue lesions were sutured. Two weeks after the first visit, pulp necrosis was found and endodontic treatment of the intruded tooth was started with a calcium hydroxide dressing. Despite the traumatic nature of the dental injury, the result of treatment was favorable. After 3 years of follow-up, repair of the resorptions and no signs of ankylosis of the teeth involved were evident. Considering the patient's age and the extent of intrusion, it was concluded that surgical repositioning associated with adequate endodontic therapy was an effective alternative treatment for this case.

Repositioning an ethic of sustainability in early childhood education, with Reconciliation as central

In this chapter I raise questions about the current scope and purpose of early childhood education for sustainability (ECEfS) and the ways ECEfS is enacted in practice. This is to highlight why social, political and economic areas of concern should be central in ECEfS alongside an environmental focus. Specifically, this chapter establishes the place of Reconciliation in ECEfS because it is one of the most pressing ethical, social, political and economic issues on the Australian landscape. To reposition an ethic of sustainability is to broaden the scope and purpose of sustainability work so that particular regard is given to the place of Reconciliation in ECEfS. An ethic of sustainability is also concerned with the responsibility of non-Indigenous educators to take ownership of Reconciliation work in education curricula and contexts.

Spatial/surveying programs repositioning within new STEM Faculty at QUT

Many of the undergraduate and postgraduate programs of the former Faculty of Built Environment and Engineering PLUS Faculty of Sciences and Technology are changing as a result of merging these two large organisations, with some disciplines relocating to faculties of Creative Industries and Health respectively. The new STEM precinct under construction has begun rising from the proverbial hole-in-the-ground. Existing Surveying and Spatial Sciences programs, assets and staff are being repositioned with the newly formed School of Earth, Environment and Biological Sciences.2011. Golden graduates morning tea organised by QUT Alumni. Technology upgrades to the Mapping Sciences lab benefits 3-D learning experiences. Second and third-year students are undertaking Work Integrated Learning (WIL) over the summer vacation period. Final year students recently presented capstone project presentations at mini-conference in the Gibson Rooms overlooking a vibrant Southbank and sparkling Brisbane River. Discussion on end of year graduation ceremony held at QPAC.

Estrogen deficiency-associated bone loss in the maxilla: A methodology to quantify the changes in the maxillary intra-radicular alveolar bone in an ovariectomized rat osteoporosis model

The effects of estrogen deficiency on bone characteristics are site-dependent, with the most commonly studied sites being appendicular long bones (proximal femur and tibia) and axial bones (vertebra). The effect on the maxillary and mandibular bones is still inconsistent and requires further investigation. This study was designed to evaluate bone quality in the posterior maxilla of ovariectomized rats in order to validate this site as an appropriate model to study the effect of osteoporotic changes. Methods: Forty-eight 3-month-old female Sprague-Dawley rats were randomly divided into two groups: an ovariectomized group (OVX, n=24) and Sham-operated group (SHAM, n=24). Six rats were randomly sacrificed from both groups at time points 8, 12, 16 and 20 weeks. The samples from tibia and maxilla were collected for Micro CT and histological analysis. For the maxilla, the volume of interest (VOI) area focused on the furcation areas of the first and second molar. Trabecular bone volume fraction (BV/TV, %), trabecular thickness (Tb.Th.), trabecular number (Tb.N.), trabecular separation (Tb.Sp.), and connectivity density (Conn.Dens) were analysed after Micro CT scanning. Results: At 8 weeks the indices BV/TV, Tb.Sp, Tb.N and Conn.Dens showed significant differences (P<0.05) between the OVX and SHAM groups in the tibia. Compared with the tibia, the maxilla developed osteoporosis at a later stage, with significant changes in maxillary bone density only occurring after 12 weeks. Compared with the SHAM group, both the first and second molars of the OVX group showed significantly decreased BV/TV values from 12 weeks, and these changes were sustained through 16 and 20 weeks. For Tb.Sp, there were significant increases in bone values for the OVX group compared with the SHAM group at 12, 16 and 20 weeks. Histological changes were highly consistent with Micro CT results. Conclusion: This study established a method to quantify the changes of intra-radicular alveolar bone in the posterior maxilla in an accepted rat osteoporosis model. The degree of the osteoporotic changes to trabecular bone architecture is site-dependent and at least 3 months are required for the osteoporotic effects to be apparent in the posterior maxilla following rat OVX.

Beyond equivalency: Repositioning artistic research within the Australian university sector

Presented in concept at the ACUADS 2008 conference, this paper reports on a research study conducted for PhD into how artistic researchers have been accommodated in the Australian university research management system, and the impacts experienced by artistic researchers through this location. It draws upon a wide range of data to provide the first analysis of this topic reported across all artistic disciplines in Australia in relation to university experiences and updates the Strand Report in 1998 in relation to government policy. Data sources include a correlation of literature from arts disciplines with that of higher education management and government policies; survey responses from of heads of academic units containing artistic researchers in over 40% of Australian universities; interviews with 27 artistic researchers in three case study universities; and interviews with longstanding expert commentators on artistic research and Deputy Vice Chancellors responsible for research. The study suggests that while limited progress has been made towards the acceptance of artistic research as an equivalent and legitimate research endeavour, significant structural, cultural and practical challenges remain which are undermining relationships between universities and their artistic staff and engendering behavioural changes within artistic practitioners that can affect the nature and quality of artistic work that is produced. Reflecting the voices of artistic researchers across the broad visual and performing arts disciplinary spectrum from early to senior career academics, it explores ways forward for universities, and artistic researchers themselves, to secure greater equity and recognition for artistic research.

Repositioning "old" drugs for new causes : identifying new treatments for prostate cancer

The majority of prostate cancer related deaths are due to the spread of the disease. This project developed a screening protocol to identify existing drugs that could be used to prevent the spread of prostate cancer and thereby improve the survival of the patients.

Repositioning the innovation rationale for public service media

The values that gave rise to the ethos of public service broadcasting (PSB) almost a century ago, and which have provided the rationale for PSBs around the world across that time, are under question. This article argues that the process of reinvention of PSBs is enhanced through repositioning the innovation rationale for public service media (PSM). It is organized around a differentiation which is part of the standard repertoire of innovation studies – that between product, process and organizational innovation – as they are being practised by the two Australian PSBs, the Australian Broadcasting Corporation (ABC) and the Special Broadcasting Service (SBS). The article then considers the general problematics of innovation for PSBs through an analysis of the operations of the public value test in the context of European PSM, and its, to this stage, non-application in Australia. The innovation rationale is argued to be a distinctive via media between complementary and comprehensive roles for PSM, which in turn suggests an international, policy-relevant research agenda focusing on international circumstances in which the public broadcaster is not market dominant.

Transition of self: Repositioning the celebrity brand through social media—The case of Elizabeth Gilbert

Transitioning the personal brand from one representation to another is sometimes necessary, particularly within the public eye. Marketing literature regarding celebrities focuses on brand endorsement (see for example Till, 1998 or Erdogan, 1999), rather than the positioning of a celebrity brand. Furthermore, the role of social media in strengthening the celebrity brand has received limited attention in the literature outside of political marketing (see for example Crawford, 2009 and Grant, Moon and Grant, 2010). This study focuses on the brand of “Elizabeth Gilbert,” author of the bestseller memoir, Eat, Pray, Love (2006). Through critical discourse analysis, the way the author has used social media to reposition her celebrity brand at the time of the launch of her new novel, ‘The Signature of All Things’ (2013) is examined. This study focuses on the use of social media by celebrities to strengthen the celebrity brand.