Objective: To evaluate the influence of enamel etching on tensile bond strength of orthodontic brackets bonded with resin-reinforced glass ionomer cement. Materials and Methods:The sample group consisted of 15 patients who had indications for extraction of four premolars for orthodontic reasons, equally divided into two different groups according to bracket and enamel preparation. Brackets were bonded in vivo, by the same operator, using a split mouth random technique: Group 1 (control), phosphoric acid ϩ Fuji Ortho LC; Group 2, Fuji Ortho LC without acid conditioning. The teeth were extracted after 4 weeks using elevators. An Instron Universal Testing Machine was used to apply a tensile force directly to the enamel-bracket interface at a speed of 0.5 mm/min. The groups were compared using a MannWhitney U-test and Weibull analysis. Results: Mean results and standard deviations (in MPa) for the groups were: Group 1, 6.26 (3.21), Group 2, 6.52 (2.73). No significant difference was observed in the bond strengths of the two groups evaluated (P ϭ .599). Conclusions: Fuji Ortho LC showed adequate shear bond strength and may be suitable for clinical use.
The aim of this investigation was to compare the clinical performance of a glass ionomer cement (GIC) with a composite resin when used for direct bonding of standard edgewise orthodontic brackets. Fourteen patients (10 females, four males), in whom 242 teeth were bonded with brackets, were divided into two groups: GIC (121 teeth) and composite (121 teeth). The brackets were allocated to alternate quadrants and first-time failures were recorded over a period of 24 months. Data were analysed statistically (non-parametric chi-squared test). The results demonstrated a significantly lower unpreviewed debonding index (UDI) (15.7 per cent) for the composite than for the GIC (28.1 per cent) (P = 0.042). The use of heavy archwires was largely responsible for this difference. No difference was observed when light and medium archwires were used. GIC may be a viable alternative to composite for use with light archwires and with limited treatment objectives.
This article reports on the orthodontic treatment performed on a 36-year-old female patient with skeletal and dental Class III pattern, presenting with a left unilateral posterior crossbite and mandibular asymmetry, and a relatively significant difference between maximum intercuspation (MIC) and centric relation (CR). The treatment was performed with maxillary dental expansion, mandibular dental contraction and anterior crossbite correction, eliminating the difference between MIC and CR. Results were based on careful diagnosis and planning of orthodontic compensation without surgical intervention in the maxilla, at the request of the patient. This case was presented to the Brazilian Board of Orthodontics and Facial Orthopedics (BBO) as representative of Category 5, i.e., malocclusion with a transverse problem, presenting with a crossbite in at least one of the quadrants, as part of the requirements for obtaining the BBO Certificate. Abstract
ResumoRelato de caso clínico de um paciente com 10 anos e 11 meses portador de maloclusão esquelética e dentária de Classe II e sobremordida exagerada. O paciente apresentava grande comprometimento estético e baixa auto-estima devido ao acentuado overjet 6mm e overbite 8mm, o que prejudicava sua harmonia facial. São descritos os procedimentos terapêuticos realizados para o tratamento da maloclusão e as alterações faciais e esqueléticas obtidas, promovidas pelos aparelhos extra-oral de tração cervical e J Hook, além das exodontias de quatro pré-molares para correção de da sobremordida profunda. Palavras-chave: Tratamento da Classe II. Extra-oral Kloehn. Crescimento. AbstractA case report of a 10 years and 11 months patient indicated for treatment of a skeletal Class II due to a maxillary protrusion and deep overbite. The patient expressed great worry related to his self-image because his large overjet resulting in soft tissue profile imbalance due to 6mm of overjet and 8mm of overbite. Therapeutic procedures are described for promotion the facial and cephalometric alterations caused by the Kloehn extra-oral traction and J Hook, moreover the four premolars extraction used to correct the Class II deep overbite malocclusion. A sobremordida exagerada é uma característica comum de muitas maloclusões e sua correção é essencial para se obter resultados ortodônticos funcionais e estéticos ideais 7,9,10 . Pode estar relacionada a diversos fatores: erupção exagerada dos incisivos superiores e/ou incisivos inferiores 7 , overjet acentuado, aumento do ângulo interincisal, infra-oclusão dos molares, altura do ramo mandibular, e padrão facial 9,10 .A correção da sobremordida exagerada pode ser realizada através da intrusão dos incisivos superiores e/ou inferiores, extrusão dos dentes posteriores da maxila e/ou mandíbula 3,10 . O tipo de tratamento deve ser escolhido de acordo com o diagnóstico correto da sobremordida. Segundo McDowell 9, a correção da sobremordida é mais estável quando tratado durante a fase de crescimento do paciente. Mesmo que ocorra uma significante quantidade de extrusão dos molares superiores, os pacientes adolescentes mesoencefálicos e braquicefálicos, com plano mandibular normal e baixo respectivamente, parecem ser mais capazes de manter esses ângulos mais estáveis, do que os pacientes adultos 9 . Além disso, o tratamento ortodôn-tico realizado em apenas uma fase apresenta melhor relação custo/benefício, maior colaboração do paciente, menor tempo de tratamento e maior facilidade de acompanhamento pós-tratamento 8 . Este artigo tem como objetivo relatar um caso clínico, demonstrando as alterações faciais e esqueléticas promovidas com o aparelho extra-oral de tração cervical e extração de quatro pré-molares, na correção da maloclusão Classe II com sobremordida exagerada. RelATO DO CASOPaciente do sexo masculino, 10 anos e 11 meses de idade, procurou tratamento ortodôntico com a queixa principal de que seus dentes estavam para frente e aparentavam serem muito grandes. O paciente encontrava-se em dentição m...
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