Aim: To evaluate the reliability of linear measurements in virtual models by comparing measurements performed on virtual models obtained from alginate impression scans, plaster model and measurements performed on conventional plaster model. Methods: The sample comprised 26 randomly selected patients to have impressions of their upper and lower jaws taken using alginate and their bite registration using a wax bite. The virtual models were obtained by scanning the alginate impression and the plaster model in a laser surface scanner (R700; 3Shape, Copenhagen, Denmark), and the measurements were performed using the Ortho Analyser (3Shape) proprietary software. The linear measurements of the size of the teeth mesial to distal, arch perimeter, intercanine distance and intermolar distance in the upper and lower arches were performed on plaster models, digital impressions and digital models, by three observers and repeated after 15 days on 8 models for intra-observer evaluations. Data were tabulated and analyzed statistically. Intra-class correlation to check the agreement of intra and inter-observers and ANOVA test were used to analyze the differences between measurements of digital models from impression and digital models from plaster. Results: The results showed a statistically significant difference (pd"0.05) for the posterior teeth, anterior teeth, upper arch perimeter and lower inter-canine distance, comparing the digital models with plaster models, but these differences are considered clinically non-significant. Conclusions: Digital models were proven be reliable and clinically acceptable for measuring tooth width, perimeter arches, intercanine and intermolar distances.
Objective: The objective of this study was to relate the sinus ostium diameter with four known changes in the maxillary sinuses by means of cone beam Computed Tomography (CBCT), considering side and gender. Methodology: 415 CBCT scans were evaluated and a total of 328 CBCT scans from patients over 21 years of age were selected for the study. By means of corrected coronal reconstructions in positioning, an anteroposterior scan of the maxillary sinus region was performed to identify, locate, and measure the diameter of the sinus ostium on the right and left sides. Changes in the maxillary sinuses were considered: thickening of the sinus membrane, antral pseudocyst, partial veiling of the maxillary sinus and total veiling of the maxillary sinuses. Results: There was an influence of sex in the presence of sinus alterations, because in the sample, the odds (odds ratio) of men to have any sinus alteration was 2.44 times (p = 0.0002) greater than in women. In general, regardless of gender, there were no statistically significant differences between the diameters of the left (3.27 ± 1.2 mm) and right (3.12 ± 1.12 mm) ostia. There was also no relationship between age and diameter of ostia, and between age and types of changes sinuses. Conclusion: According to the results obtained, it can be concluded that there is no relationship between the diameter of the sinus ostium of the maxillary sinus and the most frequent sinus changes.
Superior -CAPES, pela concessão da bolsa DS (Demanda Social).
Agradecimentos Especiais
A Deus,Por iluminar, guiar meus passos e tornar tudo isso possível nunca me deixando sozinha, desprotegida ou desamparada tanto nos bons momentos como naqueles mais difíceis.
pessoa de seu Diretor, Prof. Dr. Jacks Jorge Júnior.À minha orientadora, Profa. Dra. Gláucia Maria Bovi Ambrosano, obrigada não só pela orientação neste trabalho, mas também pela disponibilidade em me atender quando preciso.À Profa. Dra. Deborah Queiroz de Freitas, obrigada por todos os ensinamentos, pelas sugestões de melhoria deste trabalho, por sempre estar disponível e ter uma paciência enorme com o meu ritmo acelerado e meu jeito atrapalhado.
A Reconstrução Facial é um método auxiliar no processo de identificação de corpos decompostos ou esqueletizados. Uma das informações necessárias para a realização desse procedimento é a espessura de tecido mole craniofacial. Na população brasileira, há poucos trabalhos acerca da influência do padrão esquelético facial na espessura de tecido mole craniofacial. Assim, o objetivo neste estudo foi avaliar a espessura de tecido mole craniofacial nas diferentes classes esqueléticas e tipos faciais, por meio de exames de tomografia computadorizada de feixe cônico (TCFC). Foram analisadas 160 imagens de TCFC (80 homens e 80 mulheres, com idades entre 21 e 40 anos). Os pacientes foram classificados em Classe I, Classe II ou Classe III e em braquifacial, mesofacial ou dolicofacial. As mensurações de espessura de tecido mole em região de perfil facial foram realizadas em 10 pontos anatômicos, utilizando-se o CS 3D Imaging Software® 3.4.3. Todas as mensurações foram realizadas por dois examinadores em consenso. Observou-se que a espessura de tecido mole foi maior nas regiões de lábio superior e estômio de indivíduos classe III quando comparados aos das classes I e II, sendo estatisticamente significante. Houve diferenças estatisticamente significantes entre os tipos faciais na espessura de tecido mole nas regiões de lábio superior, estômio, lábio inferior e labiomental. Pode-se concluir que a classe esquelética e o tipo facial influenciam na espessura de tecido mole craniofacial.
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