ABSTRACT
Situação atual: As maloclusões de Classe II com mordida profunda fazem parte dos problemas mais frequentes apresentados pelos pacientes. No Brasil, podem atingir 42%, sendo 36% divisão 1 e 6% divisão 2. Podem ser tratadas utilizando-se aparelhos fixos e removíveis, com e sem extrações dentárias e a curva de Spee no arco inferior pode ainda ser nivelada com a extrusão de pré-molares ou com a intrusão de incisivos e caninos. Material e métodos: Será apresentado o tratamento de uma maloclusão de Classe II, divisão 2, subdivisão esquerda, com mordida profunda, mordida cruzada invertida do lado esquerdo e bruxismo com desgaste total das coroas dos dentes anteriores inferiores. O paciente masculino, leucoderma, 65 anos foi tratado utilizando-se aparelho fixo, com mecânica ortodôntica bioprogressiva, para expandir o arco inferior e nivelar o plano oclusal, ganhando altura para reconstruir proteticamente as coroas dos dentes anteriores inferiores perdidos, corrigindo o torque e intruindo os incisivos superiores, além de corrigir a relação de Classe II sem extrações. Resultados: A altura necessária para reconstruir as coroas dos incisivos inferiores foi reestabelecida e relação molar de Classe I foi obtida com o uso de elásticos de Classe II e sem extrações de pré-molares. Conclusão: O tratamento dessa maloclusão foi realizado de forma satisfatória, utilizando-se a terapia bioprogressiva de Ricketts e devolvendo ao paciente forma e função. (AU)
Background: Class II deep bite malocclusions are among the most frequent problems presented in patients. In Brazil, they can reach 42%, being 36% division 1 and 6% division 2. They can be treated using fixed or removable appliances, with or without extractions and the Spee curve in the lower arch can also be leveled with premolars extrusion or with incisors and canines intrusion. Material and methods: Treatment of a Class II malocclusion, division 2 subdivision left, with deep bite, inverted crossbite on the left side and bruxism with full wear of the lower anterior teeth crowns. Male, leucoderm, 65 years old patient was treated using fixed appliance with bioprogressive orthodontic mechanics to expand the lower arch and to level the occlusal plane, gaining height to rebuild prosthetically the lost lower anterior teeth crowns, correcting axial inclination and intruding the upper incisors while correcting the Class II relation without extractions. Results: Vertical height necessary to rebuild prosthetically the lost lower anterior teeth crowns was reestablished and molar Class I relation was obtained using Class II elastics without premolars extractions. Conclusion: The treatment of this malocclusion was satisfactory finished using Ricketts bioprogressive therapy and returning form and function to the patient. (AU)
Subject(s)
Humans , Male , Aged , Bruxism , Malocclusion, Angle Class II , Orthodontics, CorrectiveABSTRACT
OBJECTIVE: The aim of this study was to investigate Nd:YAG and CO2 laser effects in the prevention of demineralization in deeper layers of enamel via successive acid challenge cycles. BACKGROUND DATA: Lasers are promising in the prevention of enamel demineralization around the orthodontic brackets; however, there are very few studies that evaluate if the effects of treatment could be extended after successive acid challenge cycles due to permanent enamel structural alterations. MATERIALS AND METHODS: Human enamel samples were divided into five groups (n = 12): G1-application of 1.23% acidulated fluoride phosphate gel (AFP, control); G2-Nd:YAG laser irradiation (0.6 W, 84.9 J/cm2, 10 Hz, 110 µs, contact mode); G3-Nd:YAG laser irradiation associated with AFP; G4-CO2 laser irradiation (0.5 W, 28.6 J/cm2, 50 Hz, 5 µs, and 10 mm focal distance); and G5-CO2 laser irradiation associated with AFP. The samples were submitted to successive acid challenge cycles. Quantitative light-induced fluorescence and scanning electron microscopy were used to assess enamel demineralization. The data were statistically compared (α = 5%). RESULTS: G1: 50.87 ± 4.57; G2: 47.72 ± 2.87; G3: 50.96 ± 4.01; G4: 28.21 ± 2.19; and G5: 30.13 ± 6.38. The CO2 laser groups had significantly lower mineral losses than those observed in all other groups after successive acid challenge cycles. CONCLUSIONS: Only the CO2 laser (10.6 µm) irradiation prevents enamel demineralization around the orthodontic brackets even after exposure to successive acid challenges. The CO2 laser at 10.6 µm showed a deeper effect in enamel regarding caries prevention.
Subject(s)
Dental Enamel/radiation effects , Lasers, Gas , Lasers, Solid-State , Low-Level Light Therapy/methods , Tooth Demineralization/prevention & control , Dental Enamel/ultrastructure , Humans , In Vitro Techniques , Microscopy, Electron, Scanning , Orthodontics , Sensitivity and SpecificityABSTRACT
In this article, we will describe the modus operandi ofdirect dental tracks to intercept some maocclusions. These tracks are accessible to orthodontists, pediatric dentists, and general practitioners and can be implemented as soon a malocclusion is detected, thus restoring bilateral occlusal balance and normal individual growth and development.
Subject(s)
Malocclusion/therapy , Orthodontics, Corrective/methods , Child , Child, Preschool , Female , Humans , Male , Practice Guidelines as TopicABSTRACT
One possible undesirable consequence of orthodontic therapy is the development of incipient caries lesions of enamel around brackets. The aim of this study was to compare the effects of CO2 (λ = 10.6 µm) and Nd:YAG (λ = 1,064 nm) lasers associated or not with topical fluoride application on the prevention of caries lesions around brackets. Brackets were bonded to the enamel of 65 premolars. The experimental groups (n = 13) were: G1--application of 1.23% acidulated fluoride phosphate gel (AFP, control); G2--Nd:YAG laser irradiation (0.6 W, 84.9 J/cm(2), 10 Hz, 110 µs, contact mode); G3--Nd:YAG laser irradiation associated with AFP; G4--CO2 laser irradiation (0.5 W, 28.6 J/cm(2), 50 Hz, 5 µs, and 10 mm focal distance); and G5--CO2 laser irradiation associated with AFP. Quantitative light-induced fluorescence was used to assess enamel demineralization. The data were statistically compared (α = 5%). The highest demineralization occurred in the Nd:YAG laser group (G2, 26.15% ± 1.94). The demineralization of all other groups was similar to that of the control group. In conclusion, CO2 laser alone was able to control enamel demineralization around brackets at the same level as that obtained with topical fluoride application.
