RESUMO

OBJECTIVE: The aim of this study was to evaluate dentoskeletal changes in the treatment of Class II malocclusion with the Herbst Cantilever Bite Jumper (CBJ) appliance, associated with multibracket appliances after the growth peak, at pretreatment. MATERIALS AND METHODS: A sample of 37 individuals was divided into two groups: the experimental group comprised 16 patients treated consecutively for a mean period of 2.52 years with the Herbst CBJ appliance associated with multibracket appliances. A total of 21 subjects (10 males and 11 females) with Class II malocclusion and mean age at T1 of 16.08 years were followed for a mean period of 2.12 years composed the control group. Comparisons between the two groups were performed using initial and final lateral cephalograms. Comparisons between experimental and control groups at pretreatment and of the treatment changes were performed by Mann-Whitney or independent t-tests. RESULTS: Experimental group exhibited a significantly greater labial inclination of the mandibular incisors in comparison to the control group. Additionally, significantly greater corrections in overbite, overjet, and molar relationship were observed in the experimental than in the control groups. CONCLUSION: The effects of the Herbst CBJ appliance, associated with fixed appliances after the growth peak in Class II malocclusion treatment are correction in molar relationship toward a Class I relationship, decrease of the overjet, decrease of the overbite, and mandibular incisors labial inclination.

RESUMO

A PCR-Restriction Fragment Length Polymorphism (RFLP) targeting the mannose phosphate isomerase gene was established to differentiate Leishmania species distributed near the Department of Huanuco, Peru. The technique was applied to 267 DNA samples extracted from Giemsa-stained smears of cutaneous lesions taken from patients suspected for cutaneous leishmaniasis in the area, and the present status of causative Leishmania species was identified. Of 114 PCR-amplified samples, 22, 19, 24 and 49 samples were identified to be infected by Leishmania (Viannia) braziliensis, L. (V.) peruviana, L. (V.) guyanensis, and a hybrid of L. (V.) braziliensis/L. (V.) peruviana, respectively, and the validity of PCR-RFLP was confirmed by sequence analysis. Since PCR-RFLP is simple and rapid, the technique will be a useful tool for the epidemiological study of leishmaniasis.

Assuntos

RESUMO

OBJECTIVE: The objective of this study was to evaluate dentoskeletal effects in the treatment of Class II malocclusion performed with the Herbst appliance in patients at post-peak stage of growth. METHODS: The sample consisted of 16 patients with Class II malocclusion and average initial and final ages of 14.04 (ranging from 11.50 to 35.66) and 17.14 (ranging from 13.68 to 38.64) years, respectively, who were treated for an mean time of 2.52 years. Lateral cephalograms were obtained at treatment onset (T1) and completion (T2) to evaluate the effects of therapy. Initial dental casts were also used to evaluate the overjet and the anteroposterior severity of molar relationship at treatment onset. The cephalometric changes between initial and final stages were compared by means of the non-parametric Wilcoxon test. RESULTS: The results showed that the Herbst appliance did not promote significant changes in the maxillary component and the effective length of the mandible significantly increased without improving the maxillomandibular relationship. Changes in the maxillary and mandibular dentoalveolar components revealed that the maxillary incisors exhibited retrusion and lingual tipping, while the mandibular incisors presented increased protrusion and buccal tipping. The dental relationships exhibited significant improvements with the treatment. CONCLUSION: Based on the present results, it was concluded that the effects of treatment performed with the Herbst appliance in patients at post-peak stage of growth are predominantly of dentoalveolar nature.

Assuntos

RESUMO

OBJETIVO: avaliar os efeitos dentoesqueléticos do tratamento da má oclusão de Classe II com o aparelho de Herbst em pacientes que se encontravam na fase pós-pico de crescimento. MÉTODOS: a amostra consistiu de 16 pacientes com má oclusão de Classe II com medianas das idades inicial e final de 14,04 (amplitude 11,50 - 35,66) e 17,14 anos (amplitude 13,68 - 38,64), respectivamente, que foram tratados por um período médio de 2,52 anos. Telerradiografias em norma lateral foram obtidas ao início e final do tratamento para avaliar as alterações decorrentes do tratamento. Os modelos de gesso iniciais foram utilizados para avaliar o trespasse horizontal e a severidade da relação anteroposterior existente entre os molares ao início do tratamento. As alterações cefalométricas entre as fases inicial e final foram comparadas pelo teste não-paramétrico de Wilcoxon. RESULTADOS: os resultados mostraram que o aparelho de Herbst não promoveu alterações significativas no componente maxilar, o comprimento efetivo da mandíbula aumentou significativamente, sem promover uma melhoria da relação maxilomandibular. As alterações dos componentes dentoalveolares superiores e inferiores mostraram que os incisivos superiores apresentaram uma retrusão e inclinação lingual, ao passo que os incisivos inferiores evidenciaram um aumento na protrusão e inclinação para vestibular. As relações dentárias apresentaram uma melhora significativa com o tratamento. CONCLUSÃO: com base nos resultados desse trabalho, concluiu-se que os efeitos da terapia com o aparelho de Herbst em pacientes na fase pós-pico de crescimento são de natureza predominantemente dentoalveolar.

OBJECTIVE: The objective of this study was to evaluate dentoskeletal effects in the treatment of Class II malocclusion performed with the Herbst appliance in patients at post-peak stage of growth. METHODS: The sample consisted of 16 patients with Class II malocclusion and average initial and final ages of 14.04 (ranging from 11.50 to 35.66) and 17.14 (ranging from 13.68 to 38.64) years, respectively, who were treated for an mean time of 2.52 years. Lateral cephalograms were obtained at treatment onset (T1) and completion (T2) to evaluate the effects of therapy. Initial dental casts were also used to evaluate the overjet and the anteroposterior severity of molar relationship at treatment onset. The cephalometric changes between initial and final stages were compared by means of the non-parametric Wilcoxon test. RESULTS: The results showed that the Herbst appliance did not promote significant changes in the maxillary component and the effective length of the mandible significantly increased without improving the maxillomandibular relationship. Changes in the maxillary and mandibular dentoalveolar components revealed that the maxillary incisors exhibited retrusion and lingual tipping, while the mandibular incisors presented increased protrusion and buccal tipping. The dental relationships exhibited significant improvements with the treatment. CONCLUSION: Based on the present results, it was concluded that the effects of treatment performed with the Herbst appliance in patients at post-peak stage of growth are predominantly of dentoalveolar nature.

Assuntos

RESUMO

Nuestro objetivo en comunicar la experiencia de un Schwannoma de extirpe maligno acompañado de una localización infrecuente en una paciente portadora de neurofibromatosis. El estudio histopatológico reportó neuroplasia maligna de fibras nerviosas compatible con Schwannoma Maligno Epitelioide con diferenciación Rabdomioblástica y Neurofibromatosis. Los autores concluyen que se trata de un caso poco frecuente en cuanto a malignidad y localización. Se prefiere la denominación del tumor maligno de la vaina de los nervios periféricos en vez de Schwannoma. El pricinpal tratamiento es quirúrgico con el objetivo de resección completa del tumor y márgenes libres más radioterapia adyuvante al lecho tumoral.

Assuntos

RESUMO

La creciente utilización de la mamografía de pesquisa ha contribuido a un rápido aumento en el diagnóstico de lesiones mamarias no palpables; los signos mamográficos de malignidad son principalmente: las microcalcificaciones y los cambios de densidad. En el Servicio de Patología Mamaria del I.O.L.R desde enero de 2000 a julio de 2001, fueron operados por radiocalización con arpón, 27 casos en pacientes con lesiones subclínicas. La edad promedio fue de 48 años (28-67). Todas las lesiones fueron detectadas por mamografía, siendo predominantes las microcalcificaciones: 19 casos (70,4 por ciento), nódulos: 4 casos (14,8 por ciento), combinación ambos: 3 casos (11,1 por ciento) y distorsión arquitectura: 1 caso (3,7 por ciento). Las lesiones fueron resecadas en su totalidad con márgenes libres en 24 casos (88,9 por ciento), y los restantes 3 casos requirieron ampliación de márgenes. El volumen promedio de la pieza fue aproximado de 82 cc. El resultado histológico reportó: lesión premaligna: 2 casos (7,4 por ciento), carcinoma in situ: 4 casos (14,8 por ciento), carcinoma microinfiltrante: 1 caso (3,7 por ciento), carcinoma infiltrante: 2 casos (7,4 por ciento), representando un 33 por ciento del total; el resto correspondió a patologías benignas, en las cuales, las frecuentes fueron: condición fibroquística: 15 casos (55,6 por ciento), adenosis: 8 casos (29,6 por ciento), ectasia ductal: 5 casos (18,5 por ciento), entre otras. Este trabajo demuestra la efectividad del método, y su utilidad para el diagnóstico histológico de lesiones subclínicas sospechosas. Nuestros resultados de patología premaligna y maligna de un 33 por ciento de los casos, son similares a las publicaciones internacionales, indicando una adecuada selección clínica de los pacientes de riesgo

Assuntos

Assuntos