ABSTRACT
Objective: The aim of this study was to assess the effect of low-level laser therapy on tissue repair in the rabbit mandible after osteotomy and distraction osteogenesis, through histological analysis of the area of bone neo formation and measurement of the amount of neoformed bone. Methods: Twenty-four male New Zealand white rabbits were randomly allocated into one of two groups: experiment (laser applied directly over the site of fracture and distraction osteogenesis) or control (non-irradiated animals). Distraction osteogenesis was performed according to the following protocol: 3 days of latency, 7 days of activation (0.8 mm/day), and 10 days of consolidation. In the experiment group, irradiation was performed with an infrared laser (AlGaAs; wave-length 830 nm, CW, time 101 seconds, 40mW), at a dose of 10 J/cm2 per session, every 48 hours during the activation period. Twenty days after surgery, all rabbits were sacrificed. Results: The amount of neoformed bone was significantly higher in the laser-treated group (62.68%) than in the control group (43.09%) (p < 0.001). Conclusion: The application of low-level laser therapy following the irradiation protocol used in this study had a positive effect on the tissue repair process in a rabbit model of mandibular fracture and distraction osteogenesis, as shown by histological analysis.
ABSTRACT
Objetivo: Partindo do pressuposto que o padrão cefalométricodeve ser étnico-específico, esta pesquisa realizou um estudocomparativo entre dimensões cefalométricas lineares eangulares de pontos anatômicos relacionados com o perfildentoesquelético maxilar e perfil mole nasolabial. Método: Asamostras que compuseram o estudo foram obtidas a partir detelerradiografias, em norma lateral, e agrupadas de acordo comas etnias branca e negra, cada uma com 20 indivíduos. Asradiografias foram submetidas à análise cefalométricacomputadorizada de Ricketts, utilizando o Programa Radiocef2.0®. Os valores alcançados tiveram tratamento estatístico,utilizando o teste paramétrico Anova, considerando p=0,05.Resultados: As dimensões cefalométricas que expressamdistância do ponto A ao ponto subnasal, comprimento do lábiosuperior, inclinação dos dentes incisivos superiores e o ângulonasolabial são as mais representativas das diferenças entre asetnias estudadas. Conclusão: Existem diferençasestatisticamente significativas entre as dimensõescefalométricas lineares e angulares entre os indivíduosleucodermos e melanodermos, indicando que a estrutura facialdo negro é maior que a dos indivíduos brancos, econseqüentemente atribui-se um perfil convexo, decorrentesdo posicionamento maxilar, dentário e labial nestes indivíduos.Este estudo reforça a hipótese de que as normascefalométricas devem ser elaboradas para cada grupo racial, individualmente.
Subject(s)
Humans , Male , Female , Cephalometry/methods , Surgery, Oral , Health of Ethnic Minorities , Malocclusion, Angle Class I/surgery , Malocclusion, Angle Class I/diagnosis , Malocclusion, Angle Class I , Malocclusion, Angle Class II/surgery , Malocclusion, Angle Class II/diagnosis , Malocclusion, Angle Class II , Analysis of VarianceABSTRACT
La displasia fibrosa (DF) es una patología benigna rara, generalmente asintomática, que afecta el tejido óseo. Debido al remplazo gradual del tejido óseo por tejido fibroso se producen alteraciones óseas estéticas y funcionales. En este artículo se realiza una revisión de la literatura sobre la DF y se relata un caso clínico de un hombre de 33 años de edad que presenta deformidad facial debida al crecimiento lento y progresivo del maxilar(AU)
Fibrous dysplasia (FD) is a rare bening pathology, generally asymptomatic affecting the bone tissue. Due to the gradual replacement of the bone tissue by fibrous tissue, aesthetic and functional bone alterations are produced. A review of the literature on FD is made and it is reported a clinical case of a 33-year-old man presenting facial deformity as a result of the slow and progressive growth.of the jaw(AU)