Proposta de tratamento ortopédico de paciente Classe III com hyrax modificado e máscara facial ­ relato de caso / Orthopedic treatment proposal of patient Class III with hyrax modified and facial mask ­ case report

Resumo Objetivo: Demonstrar a confecção de um hyrax híbrido apoiado em mini-implante, para o tratamento da classe III. Caso clínico: Paciente D. B. S, sexo masculino, 07 anos de idade, com mordida anterior de topo e mordida cruzada posterior unilateral direita, apinhamento leve nos incisivos inferiores, perda precoce decorrente de cárie dos elementos dentários 54 e 64 e atresia maxilar, contribuindo para a diminuição do perímetro do arco. Discussão: Em pacientes que possuem deficiência maxilar o tratamento deve englobar a estimulação e o direcionamento maxilar através de forças ortopédicas. A terapia com a Expansão Rápida da Maxila (ERM) em associação com a Máscara Facial (MF) é o tratamento mais habitual para a má oclusão classe III sendo utilizada para o tratamento da maxila retruída e também para que se acelere o crescimento maxilar. A utilização da ancoragem esquelética como forma de tratamento precoce da classe III resulta em efeitos ortopédicos fundamentalmente maiores se comparado com o tratamento convencional, desta forma, permite que não haja deslocamento dentário provocado pela força exercida durante a protração maxilar e evitando perda de espaço no perímetro do arco. Conclusão: a ancoragem esquelética vem ampliando as fronteiras dos tratamentos ortodônticos e ortopédicos, aumentando, com isso, a época de início da terapia sem efeitos dentários adversos, sendo a modificação de um hyrax convencional para um híbrido uma opção de melhor custo benefício e biológico. (AU)

Abstract Objective: To demonstrate the construction of a mini-implant-supported hybrid hyrax for the treatment of class III. Case report: Patient DB S, male, 07 years old, with upper anterior bite and right unilateral posterior crossbite, light crowding of the lower incisors, early loss due to caries of the teeth 54 and 64 and maxillary atresia, contributing to the decrease in the perimeter of the arch. Discussion: In patients who have maxillary deficiency, treatment should include maxillary stimulation and direction through orthopedic forces. Therapy with Rapid Maxillary Expansion (RME) in association with Facial Mask (MF) is the most common treatment for class III malocclusion and is used for the treatment of retruded maxilla and also to accelerate maxillary growth. The use of skeletal anchorage as a form of early class III treatment results in fundamentally greater orthopedic effects compared to conventional treatment, thus allowing for no tooth displacement caused by the force exerted during maxillary protraction and avoiding loss of space in the perimeter of the bow. Conclusion: skeletal anchorage has been expanding the frontiers of orthodontic and orthopedic treatments, thereby increasing the time to start therapy without adverse dental effects, with the modification of a conventional hyrax to a hybrid being a more cost-effective and biological option. (AU)

Relação da espessura do osso cortical da crista infrazigomática e buccal shelf em diferentes tipos de padrões faciais / Relationship of the cortical bone thickness of the infrazigomatic and buccal shelf crest in different types of facial patterns

Resumo A crista infrazigomática e buccal shelf possuem maior quantidade de osso corticalizado, que favorece a instalação de mini-implantes pela diminuição dos riscos de acidentes como também pelas maiores chances de estabilidade primária. Este trabalho tem como finalidade analisar a espessura óssea na região da crista infrazigomática e buccal shelf em diferentes tipos de padrões faciais por meio de tomografia computadorizada de feixe cônico, a fim de constatar a presença suficiente de osso corticalizado nessas regiões para inserção de mini- -implantes. A amostra de conveniência foi composta por 24 tomografias, divididas em três grupos: dolicofacial (G1), mesofacial (G2) e braquifacial (G3), as quais foram mensuradas no solfware ImplantViewer 3. O estudo envolveu duas variantes: padrão de crescimento vertical e espessura da cortical óssea na área da crista infrazigomática e da buccal shelf. 30% da amostra foi utilizada para realização do cálculo de reprodutibilidade e posteriormente a amostra completa foi submetida à análise de variância, seguido do teste de post-hoc Tukey HSD. Não houve interferência do padrão facial para a crista infrazigomática, entretanto, houve diferença estatística entre os grupos braquifaciais e dolicofaciais, como também entre os braquifaciais e mesofaciais no que diz respeito ao buccal shelf, nos quais os indivíduos braquifaciais mostraram maior espessura, seguido dos mesofaciais e dolicofaciais. Concluiu-se que os indivíduos pertencentes ao grupo braquifacial apresentaram maior espessura na região da buccal shelf quando comparados aos demais, e todos os grupos apresentaram espessura suficiente para segura instalação dos mini-implantes. (AU)

Abstract The infrazygomatic crest and buccal shelf have a greater amount of cortical bone, which favors the installation of mini-implants, reducing the risk of accidents as well as the greater chances of primary stability. This study aims to analyze bone thickness in the region of the infrazygomatic crest and buccal shelf in different types of facial patterns by means of conical beam computed tomography, in order to verify the presence of corticalized bone in these regions for insertion of mini-implants. The convenience sample consisted of 24 CT scans, divided into three groups: dolichofacial (G1), mesofacial (G2), and brachyfacial (G3), which were measured in the ImplantViewer 3 solfware. The study involved two variants: vertical growth and thickness of the cortical bone in the infrazygomatic ridge and buccal shelf area. 30% of the sample were used to perform the reproducibility calculation and afterwards the entire sample was submitted to analysis of variance, following Tukey HSD post-hoc test. There was no interference of the facial pattern for the infrazygomatic ridge, however, there was a statistical difference between the brachyphacal and dolicofacial groups, as well as between the brachyfacial and mesofacial groups with respect to buccal shelf, in which brachyfacial individuals showed greater thickness, followed by mesofacial ones and dolichofacials. It was concluded that individuals belonging to the brachyfacial group presented greater thickness in the buccal shelf region when compared to the others, and all groups presented sufficient thickness for the safe installation of the mini-implants. (AU)

Avaliação da relação da espessura da sínfise mandibular em diferentes padrões de crescimentos faciais ­ estudo com tomografia computadorizada de cone-beam / Evaluation of the relationship of mandibular symphysis thickness in different facial growth patterns ­ study with cone-beam computed tomography

Resumo Muitas são as estruturas anatômicas importantes que permeiam o tratamento ortodôntico, sendo uma delas a sínfise mandibular, estrutura na qual os incisivos inferiores estão posicionados. Tal estrutura se torna ainda mais importante pois é responsável pela estética do terço inferior da face e está diretamente relacionada com o crescimento vertical facial. Sabe- -se que para o sucesso da Ortodontia é necessário um planejamento prévio minucioso que deve ser traçado a partir de exames radiográficos detalhados, pois é diante deles que surgirão as possibilidades de tratamento. A presente pesquisa buscou mensurar a espessura da sínfise mandibular de 30 tomografias computadorizadas de pacientes dos três diferentes tipos faciais (hipodivergente, normodivergente e hiperdivergente) a fim de relacionar essa medida com o biótipo facial. Para a mensuração, foi utilizado o software ImplantViewer 3 e as tomografias foram avaliadas nos três terços do elemento dentário (apical, médio e cervical). Ao final, os dados foram comparados a partir de análise estatística. Observou-se com o estudo que não houve diferença significativa da espessura da sínfise mandibular entre os biótipos faciais, no entanto, quando se comparou os terços de um mesmo biótipo facial, percebeu-se que no biótipo hipodivergente há diferença significativa entre os terços, no biótipo normodivergente houve significância entre os terços apical e médio e apical e cervical, e no biótipo hiperdivergente, apenas os terços apical e médio apresentaram significância estatística (AU)

Abstract There are many important anatomical structures that permeate orthodontic treatment, one of which is the mandibular symphysis, a structure in which the lower incisors are positioned. This structure becomes even more important because it is responsible for the aesthetics of the lower third of the face and is directly related to vertical facial growth. It is known that for the success of Orthodontics it is necessary to have a thorough prior planning that must be drawn from detailed radiographic exams, because it is before them that the possibilities of treatment will arise. This research attempted to measure the thickness of the mandibular symphysis of 30 CT scans of patients with three different facial types (hypodivergent, normodivergent, and hyperdivergent) in order to relate this measurement to the facial biotype. ImplantViewer3 software was used for the measurement and the CT scans were evaluated in the three thirds of the dental element (apical, middle, and cervical). At the end, the data were compared based on statistical analysis. It was observed with the study that there was no significant difference in the thickness of the mandibular symphysis between the facial biotypes, however, when comparing the thirds of the same facial biotype, it was noticed that in the hypodivergent there is a significant difference, in the normodivergent biotype there was significance between the apical and middle and apical and cervical thirds, and in the hyperdivergent biotype, only the apical and medium presented statistical significance.(AU)

Early vs late orthodontic treatment of tooth crowding by first premolar extraction: A systematic review.

OBJECTIVE: To investigate the body of evidence in the literature about the most favorable time for initiating orthodontic treatment in patients with severe crowding caused by tooth size arch length deficiency (TSALD). MATERIALS AND METHODS: Electronic databases (PubMed, Ovid Medline, Scopus, Virtual Health Library, and The Cochrane Library) were searched for articles published between 1900 and April 2014. Studies were included that evaluated treatment of patients with severe crowding caused TSALD, who were treated with first premolar extraction. The association between the stage of development of occlusion at which treatment was started, and the primary and/or secondary outcomes of early and late treatment were investigated. RESULTS: After application of the eligibility criteria and reading of the full texts, six articles were included in the final review. Of these six articles, all of which were retrospective, four showed that the primary outcome (correction of severe crowding) of the early and late groups was improved, but without statistically significant differences after treatment. Therefore, the findings of secondary outcomes in the literature (postretention crowding relapse, duration of total and active treatment [treatment with appliances], external apical root resorption, and soft tissue profile) were the target of this study. These studies presented low or moderate methodological quality and control of bias. CONCLUSIONS: Both early and late extraction had a similar effect on correction of crowding. Early treatment had two favorable secondary outcomes (less relapse and reduced active treatment time) vs late treatment. However, the levels of evidence were not sufficient to assert which protocol was superior.

Corrosion behavior of self-ligating and conventional metal brackets.

OBJECTIVE: To test the null hypothesis that the aging process in self-ligating brackets is not higher than in conventional brackets. METHODS: Twenty-five conventional (GN-3M/Unitek; GE-GAC; VE-Aditek) and 25 self-ligating (SCs-3M/Unitek; INs-GAC; ECs-Aditek) metal brackets from three manufacturers (n = 150) were submitted to aging process in 0.9% NaCl solution at a constant temperature of 37 ± 1°C for 21 days. The content of nickel, chromium and iron ions in the solution collected at intervals of 7, 14 and 21 days was quantified by atomic absorption spectrophotometry. After the aging process, the brackets were analyzed by scanning electron microscopy (SEM) under 22X and 1,000X magnifications. RESULTS: Comparison of metal release in self-ligating and conventional brackets from the same manufacturer proved that the SCs group released more nickel (p < 0.05) than the GN group after 7 and 14 days, but less chromium (p < 0.05) after 14 days and less iron (p < 0.05) at the three experimental time intervals. The INs group released less iron (p < 0.05) than the GE group after 7 days and less nickel, chromium and iron (p < 0.05) after 14 and 21 days. The ECs group released more nickel, chromium and iron (p < 0.05) than the VE group after 14 days, but released less nickel and chromium (p < 0.05) after 7 days and less chromium and iron (p < 0.05) after 21 days. The SEM analysis revealed alterations on surface topography of conventional and self-ligating brackets. CONCLUSIONS: The aging process in self-ligating brackets was not greater than in conventional brackets from the same manufacturer. The null hypothesis was accepted.

Corrosion behavior of self-ligating and conventional metal brackets

Objective: To test the null hypothesis that the aging process in self-ligating brackets is not higher than in conventional brackets. Methods: Twenty-five conventional (GN-3M/Unitek; GE-GAC; VE-Aditek) and 25 self-ligating (SCs-3M/Unitek; INs-GAC; ECs-Aditek) metal brackets from three manufacturers (n = 150) were submitted to aging process in 0.9% NaCl solution at a constant temperature of 37 ± 1ºC for 21 days. The content of nickel, chromium and iron ions in the solution collected at intervals of 7, 14 and 21 days was quantified by atomic absorption spectrophotometry. After the aging process, the brackets were analyzed by scanning electron microscopy (SEM) under 22X and 1,000X magnifications. Results: Comparison of metal release in self-ligating and conventional brackets from the same manufacturer proved that the SCs group released more nickel (p < 0.05) than the GN group after 7 and 14 days, but less chromium (p < 0.05) after 14 days and less iron (p < 0.05) at the three experimental time intervals. The INs group released less iron (p < 0.05) than the GE group after 7 days and less nickel, chromium and iron (p < 0.05) after 14 and 21 days. The ECs group released more nickel, chromium and iron (p < 0.05) than the VE group after 14 days, but released less nickel and chromium (p < 0.05) after 7 days and less chromium and iron (p < 0.05) after 21 days. The SEM analysis revealed alterations on surface topography of conventional and self-ligating brackets. Conclusions: The aging process in self-ligating brackets was not greater than in conventional brackets from the same manufacturer. The null hypothesis was accepted. .

Objetivo: testar a hipótese nula de que o processo de envelhecimento em braquetes autoligáveis não é superior ao de braquetes convencionais. Métodos: Vinte e cinco braquetes metálicos convencionais (GN, 3M/Unitek; GE, GAC; VE, Aditek) e 25 autoligáveis (SCs, 3M/Unitek; INs, GAC; ECs, Aditek) de três fabricantes (n = 150) foram submetidos ao envelhecimento em solução de NaCl à temperatura constante de 37 ± 1ºC, durante 21 dias. O conteúdo de íons níquel, cromo e ferro na solução coletada com 7, 14 e 21 dias foi quantificado por meio de espectrofotometria de absorção atômica. Depois de completado o processo de envelhecimento, os braquetes foram analisados com microscópio eletrônico de varredura (MEV), em magnificações de 22x e de 1.000x. Resultados: comparando-se a liberação de metais por braquetes autoligáveis e convencionais do mesmo fabricante, observou-se que o grupo SCs liberou mais níquel (p < 0,05) que o grupo GN após 7 e 14 dias, mas menos cromo (p < 0,05) após 14 dias e menos ferro (p < 0,05) nos três períodos experimentais. O grupo INs liberou menos ferro (p < 0,05) que o grupo GE após 7 dias, e menos níquel, cromo e ferro (p < 0,05) após 14 e 21 dias. O grupo ECs liberou mais níquel, cromo e ferro (p < 0,05) que o grupo VE após 14 dias; entretanto, liberou menos níquel e cromo (p < 0,05) após 7 dias e menos cromo e ferro (p < 0,05) após 21 dias. A análise no MEV demonstrou alterações na topografia da superfície de braquetes convencionais e autoligáveis. Conclusões: o processo de envelhecimento em braquetes autoligáveis não foi superior ao de braquetes convencionais do mesmo fabricante. A hipótese nula está aceita. .

Influence of optical properties of esthetic brackets (color, translucence, and fluorescence) on visual perception.

INTRODUCTION: The aims of this study were to evaluate the optical properties of esthetic brackets and determine their influence on visual perception. METHODS: Eighty esthetic brackets of 16 commercial brands were tested. The color and translucency of the brackets, as well as the color of the maxillary central incisors of 40 subjects, were measured with a spectrophotometer. The fluorescence of the brackets was determined by duly calibrated appraisers. The color differences between the brands of brackets and the teeth were calculated. Data were analyzed by using 1-way analysis of variance; the Scheffé multiple comparison test was used to establish the difference between brands of brackets, (α = 0.05). RESULTS: The color parameters L ∗ a ∗ b ∗ of nontranslucent brackets ranged from 49.4 to 86.0, -1.6 to 3.0, and 1.9 to 14.6, respectively. The direct transmission of light ranged from 0.0% to 38.8% transmittance. No bracket showed fluorescence. The color and translucency, as well as the color difference, of the brackets were influenced by brand (P <0.01). CONCLUSIONS: The optical properties of esthetic brackets have a direct influence on visual perception; translucent brackets and the nontranslucent InVu (TP Orthodontics, LaPorte, Ind) brackets were less visually perceptible.