The purpose of this study was to assess the influence of two light units, a quartz-tungsten-halogen (QTH) and a light-emitting diode (LED), on the hardness and degree of conversion of an orthodontic composite resin. Sixty specimen disks were prepared from Transbond XT composite resin (3M Unitek) and light cured for 10, 20, and 30 seconds with a QTH (Curing Light XL 3000, 3M Unitek) or a LED (Ortholux, 3M Unitek) light-curing unit for 5, 10, and 15 seconds. Composite resin polymerization was evaluated by Fourier-transform infrared (FTIR) spectrophotometry and Knoop hardness number (KHN). The results were statistically analysed using analysis of variance and Tukey's multiple comparisons test (alpha = 0.05). The highest KHN was obtained with the QTH at 30 (25.19 KHN) and 20 (24.01) seconds, which did not differ statistically, and in the LED 15 second (21.86) group. The QTH 10 second group (20.53) did not differ statistically from the QTH 20 second or the LED 5 (19.96) and 15, or 10 second (18.95) groups. According to FTIR, there was no statistical difference for the degree of conversion among the groups, QTH 10 (43.42 per cent), QTH 20 (46.12 per cent), QTH 30 (45.30 per cent), LED 10 (47.02 per cent), or LED 15 (47.24 per cent) seconds. The lowest degree of conversion was obtained for the LED 5 second group (38.97 per cent), which did not differ statistically from the QTH 10 second group. Light curing with the LED resulted in a reduction of 50 per cent in the time recommended for use of the QTH light with the composite resin, Transbond XT.
<span class="texto">O objetivo deste trabalho foi o estudo do canino superior permanente impactado, sob os aspectos de sua etiologia, diagnóstico e tratamento. A preocupação com este assunto justifica-se pela importância estética e funcional deste dente na arcada dentária, pela incidência e pelas complicações que pode acarretar. A partir da revisão de literatura, comparandose os achados dos autores, pode-se concluir que as principais causas de caninos superiores permanentes impactados são: o longo e tortuoso trajeto de erupção, a retenção prolongada ou a perda precoce de dentes decíduos, a ordem cronológica e as anomalias de forma dos incisivos laterais adjacentes. O seu diagnóstico é baseado em exame clínico e radiográfico, e o seu tratamento depende, principalmente, de sua localização.</span>
Em um estudo feito em 52 pares de modelos de gesso de pacientes leucodermas, naturais de Porto Alegre, foi medido o diâmetro M-D de pré- molares e caninos permanentes com a finalidade de testar o método de Tanaka/Johnston 14 . Neste estudo, não foram encontradas diferenças estatisticamente significantes entre os valores reais e os previstos por este método para as arcadas superior e inferior do sexo masculino e para a arcada superior do sexo feminino. Na arcada inferior do sexo feminino houve uma pequena diferença estatisticamente significante (p = 0,01).
Purpose: The objective of this paper is to report the clinical case of a patient with a Class II division 1 malocclusion with traumatized central incisors and the treatment option of extracting them, followed by space closure with lateral incisors replacement.Case description: A female patient aged 10 years old reported a previous facial trauma due to a bike accident resulting in avulsion and reimplantation of both central incisors when she was 9 years old. The treatment plan included extraction of central incisors, pulling the lateral incisors to the central incisor position and restoring them to improve esthetics.Conclusions: Extraction of maxillary central incisors is not a usual treatment protocol. However, for patients with traumatized central incisors with internal and external root reabsorption and Class II division 1 malocclusion it might be a good alternative for correction of the increased overjet.
<!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:RelyOnVML /> <o:AllowPNG /> </o:OfficeDocumentSettings> </xml><![endif]--> <p class="MsoNormal" style="text-align: justify; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 8.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri;">O movimento dentário durante o tratamento ortodôntico requer uma remodelação do osso alveolar e dos tecidos periodontais. Para a movimentação dentária, osteoclastos devem ser formados de modo que possam remover osso da área adjacente à parte comprimida do ligamento periodontal, e também é necessária a formação de osteoblastos para a produção de novo osso no lado de tensão e nas áreas de reabsorção remodeladora no lado de pressão. As prostaglandinas têm a importante propriedade de estimular tanto a atividade osteoclástica quanto a osteoblástica, fazendo isto apropriadamente como mediador do movimento dentário. São conhecidos dois tipos de fármacos que diminuem a resposta à força ortodôntica e podem influenciar o tratamento: os bisfosfonatos, usados no tratamento de doenças ósseas, e inibidores de prostaglandinas, como analgésicos e anti-inflamatórios. A ação desses fármacos pode causar profundas alterações em movimentação, velocidade e sucesso do tratamento ortodôntico, ficando evidente a relevância do tema. O objetivo deste trabalho é, por meio de uma revisão de literatura, revisar a influência dos analgésicos não-opióides e antiinflamatórios não-esteróides no movimento ortodôntico.</span></p> <p class="MsoNormal" style="text-align: justify; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 10.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-US;" lang="EN-US">The influence of non-opioid analgesics and non-steroidal anti-inflammatory drugs in orthodontic tooth movement<span style="mso-spacerun: yes;"> </span></span></p> <p class="MsoNormal" style="text-align: justify; mso-layout-grid-align: none; text-autospace: none;"><span style="font-size: 8.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-US;" lang="EN-US">The tooth movement during orthodontic treatment requires a remodeling of the alveolar bone and periodontal tissues. For tooth movement, osteoclasts are formed so that they can remove the bone area adjacent to the compressed portion of the periodontal ligament, and is also required the formation of osteoblasts to produce new bone at the tension side. Prostaglandins have the important property of stimulating both the osteoblastic and osteoclastic activity, doing this properly as a mediator of tooth movement. There are two types of drugs that decrease response to the force and can influence the orthodontic treatment: bisphosphonates used in the treatment of bone diseases, and prostaglandin inhibitors such as analgesics and anti-inflammatory drugs. The action of these drugs can cause profound changes in movement, speed and success of orthodontic treatment, evidencing the importance of the topic. The objective of this study is to review the influence of non-opioid analgesics and non-steroidal anti-inflammatory drugs in orthodontic tooth movement.<span style="mso-spacerun: yes;"> </span></span></p> <p class="MsoNormal" style="text-align: justify; mso-layout-grid-align: none; text-autospace: none;"><strong><span style="font-size: 8.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-US;" lang="EN-US">Key</span></strong><span style="font-size: 8.0pt; mso-ascii-font-family: Calibri; mso-hansi-font-family: Calibri; mso-bidi-font-family: Calibri; mso-ansi-language: EN-US;" lang="EN-US"> <strong>words</strong>: Analgesics, Non-Narcotic. 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Purpose: To analyze, in vitro, the influence of a quartz-tungsten-halogen (QTH) and a plasma arc (PAC) on the degree of conversion and hardness of a composite resin, as well as the heat generated by the units.Methods: Transbond XT disks were prepared and light-cured for 10, 20 and 30 seconds with a QTH (Curing Light XL 3000) or with a PAC (Apollo 95E) for 1, 2 and 3 seconds. The composite resin polymerization was evaluated by infrared spectrophotometry (FTIR) and Knoop hardness number (KHN). The temperature at the curing tip was evaluated. The results were analyzed using ANOVA and Tukey test (α=0.05).Results: According to FTIR and KHN, the polymerization of the composite resin was statistically higher with the QTH. The temperature obtained with the QTH 20 s (45.44ºC) and 30 s (45.84ºC) was statistically higher than the QTH 10 s (39.90ºC). The PAC 1 s (27.12ºC), 2 s (28.48ºC) and 3 s (29.96ºC) presented the lowest temperature and did not differ statistically among them.Conclusion: Transbond XT light-activated for 10, 20 and 30 seconds with the QTH presented higher degree of conversion and hardness in comparison with those obtained with the PAC for 1, 2 and 3 seconds, and the QTH generated more heat than the PAC.Key words: Composite resin; degree of conversion; hardness; PAC; QTH ResumoObjetivo: Analisar, in vitro, as fontes luminosas Halógena (QTH) e Xenon (PAC) no grau de conversão e dureza de uma resina composta e também o calor gerado por estas unidades.Metodologia: discos com resina Transbond XT foram fotoativados por 10, 20 e 30 segundos com QTH (Curing light XL 3000) ou com PAC (Apollo 95E) por 1, 2 e 3 segundos. A resina composta foi analisada por meio de espectrofotometria infravermelha (FTIR) e pelo teste de dureza Knoop (KHN). A temperatura na ponta dos aparelhos foi também avaliada. Os resultados foram analisados usando ANOVA e Tuckey test (α=0.05).Resultados: Conforme FTIR e KHN a polimerização do compósito foi estatisticamente maior com QTH. A temperatura obtida do QTH com 20 segundos (45,44ºC) foi estatisticamente maior do que com 10 segundos (39,90ºC). O PAC com 1, 2 e 3 segundos apresentou as temperaturas mais baixas e não diferem estatisticamente entre si.Conclusão: A resina Transbond XT fotoativada por 10, 20 e 30 segundos com QTH apresentou maior grau de conversão e dureza em comparação com PAC por 1, 2 e 3 segundos. O QTH produziu mais calor que o PAC.
Esse estudo apresenta uma nova estruturação dos dados cefalométricos agrupando-os num modelo denominado padrão UFRGS. A efetividade deste modelo foi testada utilizando-se 55 telerradiografias de perfil e comparando-se o desempenho diagnóstico com os padrões USP e Ricketts, avaliando-se os fatores não coincidentes com estes cefalogramas, que foram: a relação das bases apicais com a base anterior do cranio no USP; e a posição e inclinação dos incisivos superiores e inclinação dos incisivos inferiores com o Ricketts. Na realização destas comparações utilizou-se medidas complementares a fim de torná-las mais fidedignas. Os resultados mostraram a confiabilidade do padrão UFRGS na estruturação do diagnóstico.
A intrusão de um dente decíduo numa faixa etária precose, pode causar sérios danos ao seu sucessor permanente. Um caso clínico é relatado no qual, devido a este tipo de traumatismo na dentadura decídua, houve desvio do eixo de erupção, com a conseqüente dilaceração do dente permanente. Num acompanhamento de dois (2) anos é descrito o tratamento ortodôntico-cirúrgico, em cuja técnica é aplicada a laçada dupla.
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