Orientador: Jose Ricardo de Albergaria Barbosa / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-27T15:59:26Z (GMT). No. of bitstreams: 1 Sigua-Rodriguez_EderAlberto_M.pdf: 2176821 bytes, checksum: b803d24031ee26b312d3a029527cb4c4 (MD5) Previous issue date: 2015 / Resumo: Defeitos auriculares são causados geralmente por cirurgias oncológicas ablativas, malformações ou traumas. Prótese auricular é dentre as próteses faciais, a que se propõe a restaurar artificialmente ou aloplasticamente as lesões totais ou parciais da orelha. A retenção da prótese auricular pode ser mecânica, adesiva ou implanto-retida, assim o uso de implantes osseointegráveis para retenção de próteses auriculares tem trazido benefícios na estabilidade. Diferentes sistemas de retenção têm sidos utilizados com especificidades em relação às características na retenção, indicação e limitações. O presente trabalho teve como objetivo avaliar o comportamento mecânico de três sistemas de retenção de próteses auriculares quando submetidos à ciclagem mecânica. Doze modelos de resina acrílica com dois implantes instalados distando 20 mm entre si foram obtidos e divididos em três grupos, estes foram considerados como fatores de estudo: I - Barra-clipe (Sistema INP® - São Paulo - Brasil); II - Magneto (Metalmag® - São Paulo - Brasil ) e III - Ball/O-ring (Sistema INP® - São Paulo - Brasil). Cada grupo foi composto por quatro amostras, que foram submetidas ao teste de ciclagem mecânica de remoção e inserção (f = 0,5 Hz) para determinar a resistência à tração. A máquina servo-hidráulica MTS 810-Flex Test 40 (Eden Prairie, MN- USA) foi utilizada para realizar a ciclagem, com um deslocamento de 2.5mm e uma velocidade de 10 mm/s. Os valores da força de retenção foram obtidos em sete tempos (Inicial, 540, 1080, 1620, 2160, 2700 e 3240). Os dados foram comparados utilizando o teste Kruskal Wallis no programa SPSS 18.0. Os resultados foram considerados estatisticamente significativos para valores de p<0.05. O grupo retido pelo sistema barra-clipe apresentou maior força de resistência à tração (29,61 N) com diferença estatisticamente significativa quando comparado com o grupo retido pelo sistema ball/o-ring (9,41 N) e com o sistema com magnetos (8,62 N). Os grupos com retenção promovida por magneto e pelo sistema ball/o-ring diferiram com significância estatística somente para a tração inicial, que se mostrou maior no sistema ball/o-ring (p<. 05). Ao finalizar o teste de ciclagem o sistema barra-clipe garantiu maior retentividade, os sistemas avaliados apresentam força de resistência à tração compatível com o uso clínico e não tiveram fraturas dos componentes durante a avaliação de simulação de três anos de inserção e remoção / Abstract: Auricular defects are generally caused by ablative cancer surgeries, malformations or traumas. Auricular prosthesis is among the facial prosthesis used to restore artificially or alloplastic the partial or total lesions that effects of the auricular. The auricular prosthesis retention can be mechanical, adhesive or implant-supported. Therefore the use of osseointegrated implants for the retention of auricular prosthesis have brought benefits regarding stability, also different retained auricular systems have been used to show the differences between retention, display and limitations. This study aimed to evaluate the mechanical behavior of 3 retained auricular prosthetic connections when submitted to a mechanical cycling test. To conduct the present study, twelve acrylic resin models with installed implants positioned parallel at 20 mm apart were obtained and divided into three groups according to their retention system with four samples in each group. Three retained auricular prosthesis systems implant-supported: I - Bar-Clip system (INP® System - São Paulo - Brazil); II - Magnet System (METALMAG Ltda® - São Paulo - Brazil) and III - Ball/O-ring system (INP® System - São Paulo - Brazil) were considered as study factors. Each of the samples were submitted to the pull-out test (f = 0,5 Hz) to determine its tensile strength. The mechanical cycling test was performed using the servo-hydraulic machine MTS 810-Flex Test 40 (Eden Prairie, MN- USA) that had a 2.5mm shift at a 10 mm/s velocity. The retaining strength for each of the samples were obtained at 7 intervals: 1st - Initial cycles, 2nd- 540 cycles, 3rd- 1080 cycles, 4th- 1620 cycles, 5th 2160 cycles, 6th 2700 cycles, and, finish interval 3240 cycles. Kruskal-Wallis test was used to compare the differences in tensile strength and statistical analysis was performed using SPSS 18.0 for Windows, p values ?0.05 were considered significant. The tensile strength for the group retained by the bar-clip system (29,61 N) was higher with statistically significant difference when compared to the group retained by the ball/o-ring system (9,41 N) and magnets system (8,62 N). The groups retained by the magnets system and the ball/o-ring system differed with statistical significance only for the initial traction, which was higher for the ball/o-ring system (p?0,05). At the end of the cycling test, the bar-clip system ensured greater retentiveness. The evaluated systems showed a tensile strength compatible with the clinical use and no fractures of the components during the simulation of three years of insertion and removal were observed / Mestrado / Cirurgia e Traumatologia Buco-Maxilo-Faciais / Mestre em Clínica Odontológica

Includes bibliographical references. / Use of perforators as recipient vessels in microvascular reconstruction has led to arterial diameter discrepancy becoming an increasingly common finding. Experimental and clinical evidence confirms that patency rates decrease with increasing diameter mismatch, but no good evidence is available to direct the choice of end-to-end microanastomotic technique where a small-to-large discrepancy exists. A programme of research has been conducted comparing two techniques of endto-end arterial microanastomoses, where a small-to-large diameter discrepancy exists of between 1:1.5 and 1:2.5. These techniques are; 45º oblique section of the smaller vessel, and; invaginating the smaller vessel inside the larger.

Includes references. / Despite the success of negative-pressure wound therapy, its mechanism of action remains unclear. The common perception that it reduces tissue pressure and increases perfusion has recently been challenged following the observation that tissue necrosis can be caused as a result of its application. A programme of research has been conducted to clarify how tissue pressure changes during negative-pressure wound therapy and the resultant effect thereof on perfusion. The cause for conflicting evidence from other studies was also investigated.

Background: Maxillary defects caused by trauma or tumour resection in the head and neck region can be devastating to the patient from a cosmetic and functional perspective. Patients who undergo maxillectomy procedures experience a substantial deterioration in their primary oral functions such as breathing, mastication, salivation, deglutition and phonation, which has a collective adverse influence on their quality of life (QOL). The revascularised free fibula flap (RFFF) has been demonstrated to be most reliable for the reconstruction of maxillary defects, and has been regarded as the 'gold standard.' A novel method of regenerating bone and soft tissue through the process of curvilinear transport distraction oseteogenesis (CTDO) has been developed and compared with the RFFF technique. Method: A prospective cohort study of 6 post-maxillectomy patients was compared regarding the clinical outcome of function and aesthetics with a group of 6 patients who had undergone RFFF reconstruction. The new bone (regenerate) was compared with the parent bone from which it had been generated. Objective measuring tools were employed to assess pre and post quality of life (QOL) aspects. The RFFF patients were not subjected to any invasive procedures save to undergo a clinical evaluation and undergo a CT scan of their maxillae. A cohort of 6 participants was treated prospectively using CTDO and the results were analysed within that cohort. These results were compared with a retrospective group of 6 participants of similar age and gender distribution who had undergone RFFF reconstruction as an external control. The patented Hendricks-Vicatos (H-V) maxillary transport distractor was applied to all selected participants by the primary investigator under general anaesthesia at Groote Schuur Hospital or a private clinic. The H-V maxillary transport distractor (5 prototypes) was pre-shaped and pre-fitted onto a 3-D model of the participant's maxilla, in a laboratory. This method reduced clinical installation time. If teeth were present in the area to be distracted, then at least 2 teeth were removed from the maxilla, preferably three months before the date of distraction. In the first few cases, this was the protocol for developing bone stock. This protocol was revised in the last 2 patients of the study, where no teeth were extracted at all. A linear fracture (bi-cortical) was created in the maxilla in a vertical direction (segmentally) to develop a mobile, well-vascularised transport disc. This carrier disc was attached to the metal plate of the 'crawler' via small titanium screws. The crawler was then moved on the reconstruction plate (BiometTM Zimmer Biomet,

Indiana University-Purdue University Indianapolis (IUPUI) / This investigation was conducted to individualize growth prediction by use of regression formulas and therefore supplement the present method of using mean incremental data obtained from case study. There were 30 normal individuals, ages 8 to 19 years, 14 males and 16 females. Based on the analysis of serial headplates, the incremental growth change for 12 variables to be used in growth prediction was calculated for each individual for each 3 year period until adulthood was reached. Cephalometric measurements, consisting of 39 variables, were made at the beginning of each 3 year period. For every age group the following information was fed into a computer: a.) The known incremental growth change for each 3 year for the 12 variables to be used in prediction. b.) The known measurements of the 39 variables at the beginning of each 3 year period. The computer selected from the 39 variables only those which best predicted the already known incremental growth change of the 12 variables to be used in prediction. A total of 101 regression formulas of a possible 108 was obtained for males, and 102 for females, with a high multiple correlation. A sign test at .05 level of confidence was used to determine if this regression formula method was significantly better than the mean incremental method presently used at Indiana University. The results showed that, in the majority of the cases, the regression method proved to be significantly better than the mean incremental method. In none of the cases was the man incremental method significantly better.

Magister Scientiae Dentium - MSc(Dent) / Over the last few decades, and throughout the world, there would seem to have been an increase in the number and severity of infections affecting the maxillofacial region. In the South African setting this seems to be especially evident in the state health system. Maxillofacial infection of odontogenic origin is largely preventable. If treated appropriately and early in the pathological process, the progression of the disease process is generally prevented and complications avoided. Management of maxillofacial infections once established has serious implications for patients and an already stressed health system. The reasons for this perceived increase in infections are likely multifactorial and it is hoped that this study may aid in understanding factors contributing to this burden.

Thesis (Ph. D.)--University of Florida, 1998. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Michigan, 1964.

Thesis (M.S.)--University of Michigan, 1994.

Thesis--University of Helsinki, 1978.