Avaliação das áreas hialinas decorrentes da movimentação dentária induzida
Carregando...
Data
2016-06-07
Autores
Andrade, Priscilla Cunha Santos [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
Objetivo: Avaliar a formação das áreas hialinas (AH) e a quantidade de movimentação dentária induzida (MDI), no ligamento periodontal, decorrentes da aplicação de forças ortodônticas no modelo experimental utilizando-se molares de ratos. Materiais e métodos: Foram utilizados 70 ratos Wistar que foram divididos em 7 grupos (n=10), um grupo controle (GC) e seis grupos experimentais (GM1, GM3, GM5, GM7, GM14 e GM21) em que o primeiro molar superior direito foi movimentado com uma mola de níquel-titânio, com força contínua de 50 cN, durante 1, 3, 5, 7, 14 e 21 dias respectivamente. Foi realizada análise histopatológica e semi-quantitativa das AH (Kruskal Wallis–Dunn, p<0.05) e uma análise quantitativa da MDI (Anova-Holm Sidak, p<0.05). Resultados: Houve aumento estatisticamente significante das AH no GM3 comparado ao GC, GM14 e GM21. Na avaliação da quantidade de MDI foram detectadas diferenças estatisticamente significantes entre o GC e os demais grupos experimentais, entre GM1xGM7, GM14xGM1, 3, 5 e entre GM21xGM1, 3, 5, 7. Para as demais comparações não houve diferenças estatisticamente significantes. Conclusão: A MDI apresentou restrição nos períodos iniciais (1-5 dias) e uma aceleração nos dias subsequentes (7-21 dias). As AH apresentaram seu pico de formação aos 3 dias de MDI, sendo este o melhor período para sua observação.
Objective: To evaluate the formation of hyaline areas (HA) and the rate of induced tooth movement (ITM) derived from the application of orthodontic forces in an experimental model using rat molars. Methods: 70 Wistar rats were divided into 7 groups (n = 10), a control group (CG) and six experimental groups (GM1, GM3, GM5, GM7, GM14 and GM21) in witch upper right first molar was moved by means of nickel-titanium spring, with continuous force of 50 cN for 1, 3, 5, 7, 14 and 21 days respectively. Histopatological and semi-quantitative analysis of the HA (Kruskal Wallis–Dunn, p<0.05) and a quantitative analysis of ITM rate was conducted (Anova-Holm Sidak, p<0.05). Results: There was a statistically significant increase of HA in the GM3 compared to GC, GM14 and GM21. In assessing the amount of ITM, statistically significant differences were found among GC and all experimental groups, among GM1xGM7, GM14xGM1, 3, 5 and GM21xGM1, 3, 5, 7. Conclusion: The observed ITM showed restrain in early periods (1-5 days) and an increasing acceleration in subsequent days (7-21 days). The HA peaked formation at 3 days of ITM, which is the best time for its observation.
Objective: To evaluate the formation of hyaline areas (HA) and the rate of induced tooth movement (ITM) derived from the application of orthodontic forces in an experimental model using rat molars. Methods: 70 Wistar rats were divided into 7 groups (n = 10), a control group (CG) and six experimental groups (GM1, GM3, GM5, GM7, GM14 and GM21) in witch upper right first molar was moved by means of nickel-titanium spring, with continuous force of 50 cN for 1, 3, 5, 7, 14 and 21 days respectively. Histopatological and semi-quantitative analysis of the HA (Kruskal Wallis–Dunn, p<0.05) and a quantitative analysis of ITM rate was conducted (Anova-Holm Sidak, p<0.05). Results: There was a statistically significant increase of HA in the GM3 compared to GC, GM14 and GM21. In assessing the amount of ITM, statistically significant differences were found among GC and all experimental groups, among GM1xGM7, GM14xGM1, 3, 5 and GM21xGM1, 3, 5, 7. Conclusion: The observed ITM showed restrain in early periods (1-5 days) and an increasing acceleration in subsequent days (7-21 days). The HA peaked formation at 3 days of ITM, which is the best time for its observation.
Descrição
Palavras-chave
Movimentação Dentária, Hialina, Ratos, Tooth Movement, Hyalin, Rats