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Primary stability of orthodontic miniscrews inserted into femurs of osteopenic rats
Santos, Rogério Lacerda dos; Pithon, Matheus Melo; Araújo, Mônica Tirre de Souza; Nojima, Matilde Gonçalves da Cunha; Nojima, Lincoln Issamu.
Afiliación
  • Santos, Rogério Lacerda dos; Federal University of Rio de Janeiro. Rio de Janeiro. BR
  • Pithon, Matheus Melo; Federal University of Rio de Janeiro. Rio de Janeiro. BR
  • Araújo, Mônica Tirre de Souza; Federal University of Rio de Janeiro. Rio de Janeiro. BR
  • Nojima, Matilde Gonçalves da Cunha; Federal University of Rio de Janeiro. Rio de Janeiro. BR
  • Nojima, Lincoln Issamu; Federal University of Rio de Janeiro. Rio de Janeiro. BR
Braz. j. oral sci ; 9(4): 464-469, Oct.-Dec. 2010. ilus, tab
Article en En | LILACS, BBO | ID: lil-582279
Biblioteca responsable: BR28.1
ABSTRACT

Aim:

To test the hypothesis that bone quality may affect the stability of anchorage devices implanted in a rat model.

Methods:

Twenty male Wistar rats were divided into 2 groups Group 1 (rats treated with FK506) and Group 2(rats treated with saline solution vehicle). The immunosuppressant tacrolimus was used with the intention of causing a condition of osteopenia in Group 1. A total of 20 orthodontic mini-implants were used. One mini-implant was inserted in the right femur of each rat. After sacrificing the animals, blocks of bone tissue containing the mini-implants were removed for mechanical pull-out tests to be performed in a universal test machine at a crosshead speed of 0.5 mm/s. The maximum insertion force values and pull-out test were recorded and submitted the nonparametric analyses including the Kruskal-Wallis test and Mann-Whitney tests (p<0.05). The test for Pearson’s correlation was used to verify the correlation between bone mineral density and the pull-out test. The dose of FK506 was 2 mg/kg/day. Densitometric analysis was performed to observe the effect of FK506 on the bone mineral density.

Results:

The mean insertion force values were similar in both groups, with no statistically significant difference between them (P > 0.05). The mean pull-out force values were higher in Group 2 than in Group 1, with statistically significant difference between the groups (P < 0.05).

Conclusions:

Bone quality may affect the stability of mini-implants. Orthodontic mini-implants did not present good primary stability in a rat model with osteopenia.
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Texto completo: 1 Colección: 01-internacional Base de datos: BBO / LILACS Asunto principal: Tornillos Óseos / Densidad Ósea / Métodos de Anclaje en Ortodoncia / Miniaturización Límite: Animals Idioma: En Revista: Braz. j. oral sci Asunto de la revista: ODONTOLOGIA Año: 2010 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Brasil
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: BBO / LILACS Asunto principal: Tornillos Óseos / Densidad Ósea / Métodos de Anclaje en Ortodoncia / Miniaturización Límite: Animals Idioma: En Revista: Braz. j. oral sci Asunto de la revista: ODONTOLOGIA Año: 2010 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Brasil