Uso del modelador elástico de Bimler en el tratamiento de pacientes con pseudomesioclusión / Use of the Bimler elastic modeler in the treatment of patients with pseudomesiocclusion

Se efectuó un estudio cuasiexperimental, de intervención terapéutica, en 15 niños de 5-7 años de edad con clase III funcional, quienes acudieron a la consulta de Ortodoncia de la Clínica Estomatológica Provincial Docente "Mártires del Moncada" de Santiago de Cuba, desde septiembre del 2015 hasta febrero del 2016, a fin de emplear el modelador elástico de Bimler para el tratamiento interceptivo de estos pacientes. Para obtener la información se realizó el diagnóstico diferencial con los 5 aspectos descritos por Moyers, posteriormente se eliminaron las interferencias y se instaló el aparato. Se obtuvieron excelentes resultados, pues todas las características inadecuadas pasaron a ser adecuadas, siendo estos cambios estadísticamente significativos. Se concluyó que los niños mayormente afectados con clase III funcional fueron del sexo masculino, 6 años de edad y color de la piel mestizo.

A quasi-experimental of therapeutic intervention study was carried out in 15 children aged 5-7 with class III functional who went to the Orthodontics Service of "Mártires del Moncada" Teaching Provincial Stomatologic Clinic in Santiago de Cuba, from September, 2015 to February, 2016, in order to use the Bimler elastic modeler for the interceptive treatment of these patients. To obtain the information the differential diagnosis with the 5 aspects described by Moyers was carried out, later on the interferences were eliminated and the apparatus was placed. Excellent results were obtained, because all the inadequate characteristics became appropriate, being these changes statistically significant. It was concluded that the most affected children with class III functional were from the male sex, 6 years and mixed race.

Effect of mandibular protrusion on expression of type X collagen in condylar cartilage of young adult rats / 实用口腔医学杂志

Objective:To examine the relation between the alteration of condylar endochondral in response to mandibular protrusion and the action time length by establishing a model of mandibular protrusion on young adult rats. Methods: 75 female Sprague-Dawley rats aged 9 weeks were divided into two experimental groups and one control group. In two experimental groups, bite jumping appliances created forward positioning of the condyle for twelve hours and whole day, respectively. The experimental rats, together with the control rats, were sacrificed on days 3, 7, 14, 21 and 30, respectively. Tissue sections were cut in the sagittal plane through the mandibular condyle and were processed for in situ hybridization and immunostaining of type X collagen. Results: The peak of type X collagen protein expression in 24-hour experimental groups appeared on day 21 which was on the top of all experimental groups, while in 12-hour experimental groups it was found on day 30. The results of in situ hybridization were basically in agreement with the results of immunostaining. Conclusion: Both intermittent and continuous mandibular advancement can provoke endochondral ossification in young adult rat condylar, while 24-hour ones can produce more obvious and quicker effect.

Avaliação radiográfica do ápice radicular e da crista óssea de incisivos no tratamento ortopédico funcional / Radiographic valuation of incisors' root apex and alveolar bone crest on functional orthopedics treatement

A Ortopedia Funcional dos Maxilares visa o restabelecimento das condições adequadas para o correto desempenho das funções do aparelho estomatognático utilizando-se, para tal fim, forças leves e intermitentes. O objetivo é avaliar radiograficamente os comprimentos radiculares de incisivos centrais e laterais, superiores e inferiores, frente ao estímulo de forças ortopédicas funcionais, após o término do tratamento. Foram selecionados aleatoriamente 30 indivíduos, com idade média de I 1,5 anos, de um universo de 60 indivíduos, totalizando 107 incisivos com rizogênese completa, 80 incisivos com rizogênese incompleta e a altura de 141 cristas alveolares entre os incisivos. A análise das imagens obtidas por radiografias periapicais antes e após otérminodo tratamento, foi feita por um único examinador. Após análise estatística dos resultados (teste "t" de Student e análise de variância) observou-se alongamento adicional médio de 9% nos dentes com rizogênese completa, de 30% nos dentes comrizogênese incompleta e a altura da crista óssea manteve-se inalterada. O tratamento utilizando técnicas ortopédicas funcionais parece não induzir reabsorções radiculares nem perdas ósseas alveolares, possibilitando também o final normal da rizogênese.

Jaw Functional Orthopedics aims to lhe adequate conditions restoration for lhe correct development of stomatognatic system functions, using for this objective light ant intermittent forces. The aim of this study was avaliate trough periapical radiographies lherootlenght of central and lateral, lower and upper; incisors, after intermittent forces stimuli, used on treatment, 30 individual swith11. 5average age were selected randomly from a total sample of60 subjects, totalizing 107 incisors with complete rhizogenesis,80 incisors with incomplete rhizogenesis and 141 alveolar crests high. The digital analysis was done by a single examinator through periapical radiographies taken before and afier treatment. There was a medium adicional enlargement of 9% in complete rhizogenesis incisors, abou/ 30% in incomplete rhizogenesis incisors and alveolar crest high kept lhe same. Treatment with Jaw Functional Orthopaedics technics seems didn 'I induces root resorption neighter alveolar bone losses, making possible lhe normal endingof rhizogenesis process.

Avaliação cefalométrica dos efeitos do aparelho herbst no tratamento da deficiência mandibular na dentadura permanente / Cephalometric evaluation of the effect of the herbst appliance in the treatment of the mandibular retrognathism in the permanent dentition

OBJETIVO: o objetivo do presente estudo cefalométrico retrospectivo consistiu em investigar os efeitos induzidos pelo aparelho Herbst, complementados pela mecânica ortodôntica com aparelho Straight wire e elásticos de Classe II, na correção da má oclusão Classe II, divisão 1, Padrão II, com deficiência mandibular, na dentadura permanente. METODOLOGIA: foram traçadas telerradiografias iniciais (idade média de 12 anos e 10 meses) e finais (idade média de 14 anos e 8 meses) de 18 pacientes, 12 meninos e 6 meninas, para quantificar o comportamento de 12 grandezas cefalométricas representativas da posição sagital das bases apicais, convexidade facial, rotação mandibular e posição sagital dos incisivos superiores e inferiores. O tempo médio de tratamento foi de 22,5 meses, sendo 9,8 meses com o aparelho Herbst e 13 meses com a mecânica ortodôntica subseqüente. RESULTADOS E CONCLUSÕES: os resultados registraram: 1) ausência de influência no comportamento da maxila; 2) avanço mandibular; 3) redução na convexidade facial; 4) preservação da inclinação do plano mandibular e 5) presença de compensação dentária, sobretudo nos incisivos inferiores (vestibularização). Reitera-se, portanto, o fato de que, mesmo com aparelho ortopédico fixo, é mais previsível e mais fácil obter compensação dentária do que remodelação esquelética na correção ortopédica da deficiência mandibular.

AIM: The purpose of the current cephalometric study was to investigate the effects induced by the Herbst appliance followed by fixed orthodontic Straight wire mechanics and Class I elastics to correct a Class II division 1 malocclusion with a mandibular deficiency in the permanent dentition. MATERIAL AND METHODS: Initial (mean age of 12 years and 10 months) and final (mean age of 14 years and 8 months) cephalometric radiographs of 12 boys and 6 girls were traced to measure 12 cephalometric measurements that represented the sagittal position of the apical bases, facial convexity, mandibular rotation and sagittal position of the upper and lower incisors. Mean treatment time was 22.5 months, with 9.8 months using the Herbst appliance and 13 months with the fixed orthodontic mechanics. RESULTS AND CONCLUSIONS: The results showed: 1) no influence in the maxilla; 2) mandibular advancement; 3) reduction on the facial convexity; 4) maintenance of the mandibular plane inclination; 5) dental compensation mainly in the lower incisors (buccal tipping). Therefore, even with the Herbst fixed appliance it is more predictable and easy to obtain dental compensation than skeletal remodelling in the orthopedic correction of the mandibular deficiency.

Effect of mandibular protrusion on expression of type Ⅹ collagen in condylar cartilage of young adult rats / 实用口腔医学杂志

Objective:To examine the relation between the alteration of condylar endochondral in response to mandibular protrusion and the action time length by establishing a model of mandibular protrusion on young adult rats.Methods:75 female Sprague-Dawley rats aged 9 weeks were divided into two experimental groups and one control group.In two experimental groups,bite jumping appliances created forward positioning of the condyle for twelve hours and whole day,respectively.The experimental rats,together with the control rats,were sacrificed on days 3,7,14,21 and 30,respectively.Tissue sections were cut in the sagittal plane through the mandibular condyle and were processed for in situ hybridization and immunostaining of type X collagen.Results:The peak of type X collagen protein expression in 24-hour experimental groups appeared on day 21 which was on the top of all experimental groups,while in 12-hour experimental groups it was found on day 30.The results of in situ hybridization were basically in agreement with the results of immunostaining.Conclusion:Both intermittent and continuous mandibular advancement can provoke endochondral ossification in young adult rat condylar,while 24-hour ones can produce more obvious and quicker effect.