Na implantodontia visa-se dois grandes resultados para os desdentados parciais e totais, função mastigatória e estética. Ambos têm o mesmo grau de importância, para tanto se deve pensar no que se tem de mais seguro e prático nos dias de hoje. O cone Morse, na implantodontia oral, é um sistema de estabilidade entre o implante dentário e o parafuso intraósseo de sustentação. Para seu correto uso se faz necessário uma série de análise de suas características e condições. No presente trabalho focou-se em desenvolver protocolo de validação de torque, além de analisar parâmetros de acabamento, deformação e estabilidade précarga e pós-carga dentro de protocolos já recomendados. Avaliou-se sua condição antes e após os efeitos de carga mastigatória simulada por ensaio de fadiga. Concluiu-se que o uso do cone Morse dentro dos protocolos indicados deve ser revisto quanto a padrões similares de torque nos pilares sólidos e indexados, cada um possui limites e indicações diferentes para se manter estável. Concluiu-se também que não é um sistema totalmente livre de trânsito de bactérias e que esse trânsito aumenta de forma proporcional ao uso e força mastigatória, indicando que melhorias no acabamento entre as peças devem ser implementadas e/ou adição de material que afaste crescimento bacteriano priorizando a saúde do periodonto e do tecido ósseo de sustentação mantendo o sistema seguro em longevidade. / In implantology it is aimed two major outcomes for the partial and total toothless persons, mastigatory function and aesthetics. Both have the same degree of importance, therefore it must be thought about what is safer and more practical these days. Morse taper in oral implantology is a system of stability between the dental implant and the intraosseous screw support. For its correct use a series of analysis of its features and conditions is required. This work was focused on developing torque validation protocol, and analyzing surface finishing parameters, deformation and stability as before load and after load in recommended protocols. The implants condition before and after the effects of habitual masticatory load was simulated by fatigue testing. It was concluded that the Morse taper use within the specified protocols should be reviewed for similar patterns of torque in solids and indexed pillars, each has different limits and signs to remain stable. It was also concluded that it is not a traffic totally free system of bacteria and that this influence increases in proportion to the use and masticatory forces, improvements in the surface finish between parts and / or addition of material that hinders bacterial growth is needed if it is prioritized the health of the periodontium and the bone tissue keeping the system safe in the long therm.

Este trabalho expõe resultados obtidos durante as atividades de uma tentativa para mostrar que \"nos estudos e projetos sobre transportes, no Cone Sul (parte do continente sul-americano abaixo da linha do equador), o aumento do valor agregado aos produtos transportados pode reduzir a expectativa de crescimento da demanda por transporte\". Para isso apreciaram-se conseqüências de avaliação de projetos de transportes depois de implantação de obras e serviços, comentaram-se conceitos e relações sobre infraestrutura de transportes, renda de região, custos de transporte e preço de produtos, logística e armazenagem. Também introduziram-se conceitos e processos para estudo de variação de valores de elementos de séries temporais, o modelo A RIMA. Relatam-se dados sobre a caracterização do Cone Sul, e, a natureza da demanda, configuração de infra-estrutura e listagem de projetos sobre os equipamentos para transporte na região. Expõe-se que entrevistas a técnicos e dirigentes de órgãos de gerência da infraestrutura de transporte no Cone Sul indicam que a análise de regressão é o processo mais comum para estudo de pesos e valores de transporte - e, que entre Brasil e Argentina a qualidade das estimativas é ruim. Conceitos sobre séries temporais foram aplicados a informações sobre a área de influência do Corredor São Paulo - Buenos Aires para mostrar que a relação peso por valor transportado por ano no comércio entre o Brasil e a Argentina pode ser estudada pelo modelo ARIMA - é decrescente ao longo do tempo e mostra o aumento do valor agregado e a redução da expectativa de crescimento da demanda, representada pelo peso transportado através desse eixo. / This work shows lhe results obtained on trying to show that \"plan and projects for transportation at CONE SUL (part of South America below the Equator), the increase in the transported product aggregated value can make the expectance on the growing of the demand for transports decrease\". To do that, consequences of the evaluation of plans on transport after the implementation phase were accessed; concepts and relationships over the infrastructure of transport, in come of the region, cost of transportation and product prices, logistics and warehousing were discussed. Concepts and processes on study of the variation of values on the elements of time series were presented, the so called ARIMA model. Data on the demand, infrastructure configuration and lists of projects on equipment for transportation in region were also presented. Interviews with administrators of infrastructure of transports on the CONE SUL shows that the regression analysis is the most common method used on the study of weights and values of transports, and that the forecasting using data on commerce between Brazil and Argentina is bad. Concepts of time series were applied over information on the influence area of the São Paulo - Buenos Aires corridor to show that the relationship between weight and price average moved per year can be studied with use of the ARIMA model and decrease over the time, showing the increase of aggregated value and the expectance on the growing of the demand, represented by reduction of the transported weight on that corridor.

Os molares superiores são um dos grupos dentários que mais recebem tratamentos endodônticos e apresentam grande complexidade anatômica nos seus sistemas de canais radiculares. A presença de um canal mesiopalatino (MP) na raiz mesiovestibular é um achado bastante comum e a sua não detecção está relacionada com um alto índice de insucessos na terapia endodôntica. Recentemente, a tomografia computadorizada de feixe cônico (TCFC) vem ganhando destaque na avaliação do canal MP pela sua capacidade de fornecer informações detalhadas e em três dimensões, sendo considerada o melhor método de imagem para essa investigação in vivo. Desta forma, o objetivo desta tese foi pesquisar a prevalência e simetria do número de canais da raiz mesiovestibular em primeiros molares superiores homólogos, por meio da TCFC, assim como, analisar o uso dos filtros de refinamento de imagem para esta investigação. Para o primeiro objetivo, desenvolveu-se uma pesquisa com 264 pacientes possuindo o primeiro molar superior bilateralmente. Foi encontrada simetria em 78,79% dos pacientes, sendo que o canal MP esteve presente bilateralmente em 67,42%. Do total de 528 dentes avaliados, 78% apresentaram o canal MP não havendo correlação da sua presença com sexo e faixa etária (p > 0,05). Para o segundo objetivo, 30 exames de TCFC foram avaliados com cinco diferentes filtros (Original, Smooth, Sharpen, Sharpen Mild, Angio Sharpen Low e Angio Sharpen High) além das imagens originais (sem filtro). Todos os filtros apresentaram altos índices de acurácia (> 83,3%), sensibilidade (> 90%) e especificidade (> 62%), sem diferença estatística (p > 0,05). Entretanto, quando o nível de certeza foi avaliado, os filtros Angio Sharpen High e Sharpen apresentaram os piores resultados, com diferença significativa para as imagens Originais (p <0,05). Os resultados das pesquisas conduzidas permitem concluir que o canal MP é uma condição altamente prevalente e a sua simetria bilateral é frequente. O emprego de filtros de imagem da TCFC não influenciou a detecção do canal MP, entretanto os filtros de maior realce devem ser evitados pois reduzem a certeza do diagnóstico. / The upper molars are the dental group that most receives endodontic treatments and presents great anatomical complexity of their root canal systems. The presence of a second mesiobuccal canal (MB2) is a common finding and its non-detection is related to a high failure rate in endodontic therapy. Recently, cone-beam computed tomography (CBCT) has been highlighted in the MB2 evaluation for its ability to provide detailed and three-dimensional information, and is considered the best imaging method for such investigation in vivo. Thus, the aim of this thesis was to investigate the prevalence and symmetry of the root canal numbers from the mesiobuccal root of first homologous upper molars, as well as to evaluate the use of CBCT image filters for that purpose. For the first objective, a research was developed with 264 patients having the first upper molar bilaterally. Symmetry was found in 78.79% patients, and the MB2 was bilaterally present in 67.42%. Out the total of 528 teeth evaluated, 78% presented the MB2, with no correlation with sex and age group (p > 0.05). For the second objective, 30 CBCT scans were evaluated with five different filters (Original, Smooth, Sharpen, Sharpen Mild, Angio Sharpen Low and Angio Sharpen High) in addition to the original images (none filter). All filters presented high levels of accuracy (> 83.3%), sensitivity (> 90%) and specificity (> 62%), with no statistical difference (p > 0.05). However, when the level of certainty was evaluated, Angio Sharpen High and Sharpen filters presented the worst results, with significant difference for Original images (p < 0.05). The results of the conducted studies allow us to conclude that the MB2 is a highly prevalent condition and its bilateral simmetry is frequent. The use of CBCT image filters did not influence the MB2 detection, however higher enhancement filters should be avoided because they reduce the certainty of the diagnosis.

Resumo: O sistema de plantio direto vem sendo empregado em diversas regiões do Brasil; porém, dependendo do local e da intensidade do tráfego de máquinas, tem provocado a compactação do solo e muitos produtores utilizam como solução a escarificação da área para romper a camada que diminui o crescimento das plantas. O objetivo deste trabalho foi avaliar a influência da escarificação (0,30 m) nas propriedades físicas de um Nitossolo Vermelho distroférrico, comparando os resultados com uma área contigua não escarificada, ambas conduzidas, anteriormente, pelo sistema de plantio direto. Para a determinação da resistência mecânica à penetração, densidade e pressão de pré-consolidação do solo foram amostradas as duas áreas de plantio direto, com escarificação (PDCE) e sem escarificação (PDSE). Utilizando-se a UMAS - Unidade Móvel de Amostragem do Solo, construída pelo NEMPA - Núcleo de Ensaio de Máquinas e Pneus Agroflorestais da FCA/UNESP de Botucatu/SP, equipada com GPS, possibilitando o georeferenciamento dessas amostras. A resistência mecânica do solo à penetração de um cone foi obtida através do penetrômetro hidráulico-eletrônico e as outras propriedades foram avaliadas em laboratório através da coleta de anéis padronizados. A amostragem foi realizada no sistema de malha ("grid") seguindo as dimensões de 15 x 25 m para a resistência à penetração do solo e para a amostragem com anéis numa dimensão de 15 x 50 m, sendo coletados 160 anéis. As amostras com anéis, para a determinação da densidade e para o ensaio no consolidômetro, foram coletadas nas camadas de 0 a 0,10 m, 0,10 a 0,20 m, 0,20 a 0,30 m e 0,30 a 0,40 m e com os dados obtidos com o penetrômetro foram calculados os índices de cone para essas mesmas camadas. Com os dados obtidos e calculados foram construídos e comparados os mapas desse atributo para as áreas escarificada... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The no-tillage system has been used in several regions of Brazil, but depending on the location and intensity of machinery traffic has caused soil compaction and many producers use as a solution to scarification of the area to break the layer decreases plant growth. The aim of this study was to evaluate the influence of scarification (0.30 m) on physical properties of an Alfisol dystrophic, comparing the results with a contiguous area not scarified, both conducted previously by the system of tillage. To determine the penetration resistance, density and pressure of pre-consolidation of soil were sampled both areas of tillage, with scarification (PDCE) and without scarification (PDSE). Using the MUSS - Mobile Unit of Soil Sampling, built by NEMPA - Nucleus for Agronomic and Forest Machines and Tires Tests and FCA/UNESP, Botucatu/SP, equipped with GPS, allowed the georeferencing of these samples. The mechanical resistance to penetration of a cone penetrometer was obtained through the hydraulic-electronic and other properties were evaluated in the laboratory by collecting rings standardized. The sampling was performed at loop system ("grid") following the dimensions of 15 x 25 m for the penetration resistance and soil sampling rings with a dimension of 15 x 50 m, and collected 160 rings. Samples with rings for determining the density and test in consolidometer were collected in layers of 0 to 0.10 m, 0.10 to 0.20 m, 0.20 to 0.30, 0.30 to 0.40 m with the data obtained with the penetrometer were calculated for a cone to those layers. With the data collected and calculated were constructed and compared this attribute maps for the areas scarified and not scarified (Tillage). For the test with consolidometer rings were used with undisturbed samples to derive the load-bearing capacity of soil. Soil management adopted provide a decrease in the density of soil tillage with chiseling at depths... (Complete abstract click electronic access below) / Orientador: Kleber Pereira Lanças / Coorientador: Reginaldo Barboza da Silva / Banca: Renato Lara de Assis / Banca: Maria Helena Moraes / Mestre

INTRODUCTION: Utilization of rapid maxillary expansion (RME) is common for the correction of sagittal discrepancies in orthodontic treatment. RME appliances will transmit a compressive force to the periodontal support structures. This resultant force can lead to resorption of the dento-alveolar structures leading to unwanted dental movements. The purpose of this retrospective study was to compare changes from a periodontal and root resorption perspective by means of computer tomography with tooth-borne and bonded expanders. METHODS: The sample comprised of cone beam computed tomography and spiral CT images of 41 subjects, 12 to 17 years old, with unilateral or bilateral posterior crossbites. 20 subjects treated previously with a bonded expander and 21 with a banded expander. Pre and post-treatment images were digitized and landmarks were identified to measure buccal and lingual cortex thickness, alveolar height, root length and angulation by means of a computerized method. RESULTS: RME with banded and bonded expanders have similar effects from periodontal and root resorption perspectives. Changes include increasing thickness of lingual alveolar bone 0.2 to 0.7 mm, decreases in buccal bone width 0.1 to 0.5 mm; and decreases in alveolar height 0.1 to 0.9 mm and root length 0.3 to 1.0mm of each support teeth. CONCLUSIONS: RME with banded and bonded expanders exhibited similar changes post-expansion and these variables should not play a role in selection of the type of device.

Por meio do exame tridimensional de Tomografia computadorizada de feixe cônico (TCFC) é possível avaliar a área de interesse previamente aos procedimentos com maior precisão. As variações anatômicas são estruturas que devem ser consideradas para a realização de cirurgias, como a foramina acessória da região anterior da maxila (FARAM). O objetivo principal do presente estudo foi avaliar a FARAM, em 150 exames de TCFC, obtidas no aparelho ICat Classic®. Por meio do programa ICat Vision® foram mensuradas o diâmetro, a distância da FARAM ao forame incisivo (FARAM-FI), da FARAM ao rebordo alveolar vestibular (FARAM-RAV) e da FARAM a sutura intermaxilar (FARAM-SI). Também foi avaliada a trajetória dos canais ósseos formados a partir da FARAM. Nos pacientes dentados, foram localizados por meio da área dos dentes: incisivo central, incisivo lateral e caninos. Foi realizada a correlação entre a presença da FARAM e o gênero e a idade. Dos 150 exames, a FARAM estava presente em 21 exames (14%). Destes, dez pacientes eram edêntulos na região de interesse de estudo e não foi possível localizar a foramina em relação aos dentes. Nenhum exame apresentou a FARAM relacionada ao incisivo central, em sete estavam relacionadas ao incisivo lateral e em quatro estavam relacionadas ao canino. Nenhum exame apresentou a FARAM bilateralmente, sendo que treze foram localizadas no lado direito e oito do lado esquerdo. O diâmetro médio da FARAM foi de 1,57 ± 0,38 mm. As médias das distâncias de FARAM-RAV foi de 11,65 ± 3,34 mm, FARAM-FI foi de 8,86 ± 2,72 mm e FARAM-SI, foi de 6,37 ± 2,9 mm. A trajetória do canal ósseo mais comum foi ascendente/oblíqua em direção a região anterior do assoalho da cavidade nasal. A correlação entre a presença da FARAM e o gênero foi estaticamente significante para os homens (p=0,055) no teste do qui-quadrado. No entanto, não foi estatisticamente significante para a idade. / Through cone beam computed tomography (CBCT) is possible to evaluate the region of interest before surgical procedures in tridimensional view. Anatomical variations should be considered for performing surgeries, as the additional foraminas in anterior maxilla (AFAM). The main aim of the present study is evaluate AFAM in 150 CBCT exams, obtained through ICat Classic® device. In ICat Vision® software, the diameter, the distance from the AFAM to the incisive foramen (AFAM-IF), AFAM to the vestibular alveolar ridge (AFAM-VAR) and AFAM intermaxillary suture (AFAM-IS) were measured. It was also evaluated the trajectory of the bony canals related to AFAM. In dentate patients, AFAM was located through the teeth area: central incisor, lateral incisor and canines. The correlation between the presence of FARAM and gender and age was investigated. The AFAM was presented in 21 exams (14%). In the positive exams, 10 patients were edentulous in the region of study interest and it was not possible to locate the foramen in relation to the teeth. Any exam presented the AFAM related to the central incisor, in seven were related to the lateral incisor and in four were related to the canine. Any exam presented the AFAM bilaterally, of which thirteen were located on the right side and eight on the left side. The mean diameter of the AFAM was 1.57 ± 0.38 mm. The distance of the AFAM-VAR 11.65 ± 3.34 mm, AFAMIF was 8.86 ± 2.72 mm and AFAM-IS was 6.37 ± 2.9 mm. The most common bone canal trajectory was upward/ oblique to the anterior region of the floor of the nasal cavity. The correlation between the presence of AFAM and the gender was statically significant for males (p=0.055) in the chi-square test. However, it was not statistically significant for age.

As radiografias intraorais ilustram bem os estágios de reabsorção periodontal nas regiões interproximais. Entretanto, a sobreposição de estruturas dificulta avaliação da perda óssea nas corticais vestibular e lingual. A tomografia computadorizada por feixe cônico (TCFC) é de elevada importância em várias especialidades odontológicas, tais como implantodontia, avaliação de lesões ósseas, estudo da articulação têmporo-mandibular e cirurgia buco-maxilo-facial. A TCFC também tem tido crescente indicação em outras áreas, como a periodontia e endodontia. O objetivo no presente estudo foi a) estabelecer o protocolo de aquisição mais adequado para a detecção de lesões incipientes de furca simuladas quimicamente; e b) avaliar a reprodutibilidade, sensibilidade e especificidade da TCFC, para a finalidade previamente citada. No presente estudo, foram utilizadas 15 mandíbulas suínas maceradas, que apresentavam o segundo molar íntegro e as corticais adjacentes preservadas As simulações de lesões em região de furca foram feitas com aplicação de ácido perclórico a 70%, em até quatro sítios possíveis em cada mandíbula (vestibular do lado direito, lingual do lado direito, vestibular do lado esquerdo, lingual do lado esquerdo) por um examinador participante que não avaliou as imagens. Nos 60 sitios possíveis, foram escolhidos aleatoriamente 20 para as simulações das lesões. Posteriormente, as mandíbulas foram submetidas à TCFC (i-CAT Next Generation) em dois. protocolos de aquição: voxel 0,2 mm e 0,25 mm, ambos com FOV de 6 cm de altura por 16 cm de diâmetro e com 26,9 segundos de tempo. Dois observadores (radiologistas previamente calibrados) avaliaram os exames duas vezes, em ordem aleatória, sob iluminação controlada. Os observadores foram orientados a direcionar a avaliação das regiões dos segundos molares, e questionados se havia lesão ou não nos sítios avaliados. A interpretação das imagens foi realizada em uma estação de trabalho independente localizada no Laboratório de Imagem em Terceira Dimensão da Faculdade de Odontologia da Universidade de São Paulo, utilizando o software Xoran (Xoran Technologies). A sensibilidade, especificidade e reprodutibilidade da TCFC foram avaliadas nos dois protocolos. A TCFC apresentou especificidade alta, sensibilidade baixa e reprodutibilidade moderada na detecção de lesões incipientes de furca. A influência do tamanho do voxel não foi estatisticamente significativa na detecção destas lesões. / Intraoral radiographs illustrate the stages of resorption in periodontal interproximal regions. However, overlapping structures hinders evaluation of bone loss in the buccal and lingual cortical plates. The cone beam computed tomography (CBCT) is of high importance in various dental specialties such as implantology, evaluation of bone lesions, the study of temporomandibular joint and maxillo-facial surgery. The CBCT has also been increasing indications in other areas, such as periodontics and endodontics. The aim of this study was to establish a) the acquisition protocol most suitable for the detection of incipient furcation invasion chemically simulated and b) assess the reproducibility, sensitivity and specificity of CBCT for the purpose previously mentioned. In this study, 15 pigs macerated mandibles were used, which showed the second molar and the adjacent cortical integrity preserved. Simulated lesions in the furcation area were made with application of 70% perchloric acid, up to four possible sites in each jaw (the right buccal, the right lingual, the left buccal, and left lingual side) by an examiner participant who did not evaluate the images. In the 60 possible sites, 20 were randomly chosen for the simulated lesions. Subsequently, the mandibles underwent cone beam computed tomography (Next Generation i-CAT) in two acquisition protocols: at 0.2 mm and 0.25 mm voxel, both with FOV of 6 cm height by 16 cm in diameter and 26.9 seconds of time. Two observers (calibrated radiologists) evaluated the examinations twice, in random order under controlled lighting. Observers were instructed to direct the evaluation to the regions of the second molars, and they were asked if there were or not injuries on those avaluated sites. Image interpretation was performed on an independent workstation located at the Third Dimension Laboratory of Image in the School of Dentistry, University of São Paulo, using the software Xoran (Xoran Technologies). The sensitivity, specificity and reproducibility of CBCT were assessed in both trials. The CBCT showed high specificity, low sensitivity and moderate reproducibility in the detection of incipient lesions, furcation. The influence of voxel size was not statistically significant in detecting these lesions.

Liquefaction-induced settlements can cause a large economic toll on a region, from severe infrastructural damage, after an earthquake occurs. The ability to predict, and design for, these settlements is crucial to prevent extensive damage. However, the inherent uncertainty involved in predicting seismic events and hazards makes calculating accurate settlement estimations difficult. Currently there are several seismic hazard analysis methods, however, the performance-based earthquake engineering (PBEE) method is becoming the most promising. The PBEE framework was presented by the Pacific Earthquake Engineering Research (PEER) Center. The PEER PBEE framework is a more comprehensive seismic analysis than any past seismic hazard analysis methods because it thoroughly incorporates probability theory into all aspects of post-liquefaction settlement estimation. One settlement estimation method, used with two liquefaction triggering methods, is incorporated into the PEER framework to create a new PBEE (i.e., fully-probabilistic) post-liquefaction estimation procedure for the cone penetration test (CPT). A seismic hazard analysis tool, called CPTLiquefY, was created for this study to perform the probabilistic calculations mentioned above. Liquefaction-induced settlement predictions are computed for current design methods and the created fully-probabilistic procedure for 20 CPT files at 10 cities of varying levels of seismicity. A comparison of these results indicate that conventional design methods are adequate for areas of low seismicity and low seismic events, but may significantly under-predict seismic hazard for areas and earthquake events of mid to high seismicity.

Balance disorders and falls are prevalent among multiple pathologies that affect the musculoskeletal or sensorineural systems. Annually, fall-related injuries put excessive economic burden on society and yet, current clinical balance assessment tools based on functional tests are inaccurate and have limited association with fall risk. Therefore, there is a growing need of an accurate balance and fall risk assessment tool for clinical use. The primary purpose of this research was to develop an accurate Center of Pressure (COP) based balance assessment tool to study postural instability and fall risk. Chapter 1 aimed at development of the COP based tool using cost effective equipment- a Wii Balance Board (WBB) and testing its accuracy and errors. The result of this study indicated that the WBB tool is reliable in assessing balance and the linearity and hysteresis errors in WBB tool are higher than force plates but it compares well in terms of cost, portability and availability. Chapter 2 aimed at assessing the relation between the radiographic parameters of balance, COP metrics, and health related quality of life in adults with spinal deformities. The results of this investigation revealed that just like radiographic parameters, COP metrics could help explain some variability in symptoms in patients with comparable extent of deformity. Chapter 3 attempted to establish a threshold value of COP metrics for binary classification of fall risk in patients with multiple sclerosis (MS). The findings of this study highlighted path length as an excellent predictor of future falls with high test accuracy, sensitivity and specificity. This dissertation concludes that the WBB tool has the potential to revolutionize balance and fall risk assessment in clinical fields such as geriatrics, rehabilitation, neurology, and orthopedics.

Introduction: The use of CBCT to visualize the relationship between the inferior alveolar canal and the mandibular third molar roots continues to grow as it is becoming the standard of care. It becomes important to understand the impact that luminance, one of the factors that affects the viewing conditions of digital images, has on appropriately assessing the third molar-canal relationship. To date, no study has assessed the impact of luminance on visualizing anatomic structures on CBCT. The aim of this study is to determine if there is a difference in the ability to appropriately assess the root development and the third molar-canal relationship on a medical grade monitor with four different luminance settings on CBCT. Materials and methods: 285 scans were randomized and evaluated by three calibrated and masked evaluators. The evaluations were completed on a Barco MDNC-3321 Nio Color 3MP monitor (Kortrijk, Belgium) monitor at four different luminance settings; 200 cd/m2, 300 cd/m2, 400 cd/m2, and 500 cd/m2. The gold standard was established by two board-certified oral and maxillofacial radiologists. All evaluations were performed in a controlled subdued environment lighting of less than 15 lux. There was a washout period of at least one week between each of the four evaluations by an observer. Results: The accuracy of two of the three evaluators was substantial to almost perfect independent of luminance. None of these assessments showed any statistical significance (P = 0.05). The accuracy of one evaluator was moderate to almost perfect for all evaluations with one assessment of one canal showing statistical significance (P = 0.05). Conclusion: There is no difference in the ability to appropriately assess the third molar canal relationship or the root development of third molars on a medical grade monitor at luminance settings between the range of 200 cd/m2 and 500 cd/m2 when viewed in a dimly lit room.