RESUMO
AIM: The aim of this article was to evaluate the impact of intraoral aging and site specificity on debris accumulation and friction in molar tubes after intraoral use. MATERIALS AND METHODS: A total of 80 intraorally used first molar convertible tubes were provided by 20 orthodontic adolescent patients after 6 months of treatment. The specimens were divided into eight groups (n = 10) according to the mouth quadrant and the type of examination [four groups of ten tubes for scanning electron microscope (SEM) and four groups of ten tubes for friction test]. Scanning electron microscope examination was performed after opening the convertible caps and friction test was executed using a 0.019'' × 0.025'' stainless steel wire, which was inserted in the tubes belonging to each group. The Mann-Whitney test, analysis of variance (ANOVA), and Bonferroni tests were performed for statistical analysis at 0.01 level of significance. RESULTS: There was a significant increase in the amount of debris and frictional force after 6 months of intraoral exposure (p < 0.0001). Debris scores were higher (10% increase) on the upper tubes when compared with the lower ones, with no statistical difference. Mean frictional force ranged from 0.22 to 0.26 N according to the mouth quadrant, but the difference between groups was also not significant. CONCLUSION: After 6 months of intraoral exposure, there was a significant increase in the amount of debris in the first molar tube slots, leading to significantly higher frictional forces during sliding mechanics. The influence of site specificity on the amount of debris and on frictional forces of the first molar tubes could not be demonstrated. CLINICAL SIGNIFICANCE: Molar tubes should be cleaned, before and during sliding mechanics, in order to minimize friction.
Assuntos
Fricção , Dente Molar , Desenho de Aparelho Ortodôntico/instrumentação , Estresse Mecânico , Adolescente , Análise de Variância , Criança , Ligas Dentárias/química , Feminino , Humanos , Masculino , Microscopia Eletrônica de Varredura , Braquetes Ortodônticos , Fios Ortodônticos , Aço Inoxidável/química , Propriedades de Superfície , Fatores de Tempo , Técnicas de Movimentação Dentária , Adulto JovemAssuntos
Anodontia/terapia , Dente Canino/anormalidades , Má Oclusão Classe II de Angle/terapia , Planejamento de Assistência ao Paciente , Cefalometria/métodos , Criança , Diastema/terapia , Aparelhos de Tração Extrabucal , Seguimentos , Humanos , Masculino , Contenções Ortodônticas , Fechamento de Espaço Ortodôntico/métodos , Ortodontia Corretiva/métodos , Técnicas de Movimentação Dentária/métodos , Resultado do TratamentoRESUMO
BACKGROUND: This case report discusses the treatment of an iatrogenic periodontal defect caused by an inadequate orthodontic appliance in a 9-year-old girl. METHODS: The multidisciplinary approach to this case consisted of periodontal treatment using a bone grafting technique to restore the 10 mm bone dehiscence. Three months later orthodontic treatment was initiated to straighten and level the central incisors. Six months later mucogingival surgery was performed to cover 2 to 3 mm gingival recession. RESULTS: The bony defects were completely filled and the 10 mm dehiscence was reduced to 4 mm. The connective tissue graft resulted in a complete coverage of the recessions and a thickening of the keratinized gingiva. The patient is still undergoing orthodontic treatment. So far, straightening of the upper central incisors and closure of the diastema are satisfactory. CONCLUSIONS: Inadequate orthodontic appliances can cause iatrogenic periodontal defects. A multidisciplinary approach in a well-defined sequence can restore lost periodontal tissue, thus achieving comfort, function, and esthetics.
