Sequential bone healing of immediately loaded mini-implants: histomorphometric and fluorescence analysis

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
Glaucio G SerraMarcelo Muller

Abstract

Mini-implants are often immediately loaded for orthodontic treatment; however, changes in interfacial tissues caused by early loading and its effects might compromise the mini-implant's function. The purpose of this study was to compare the healing of interfacial tissues 1, 4, and 12 weeks after the placement of titanium-alloy mini-implants in New Zealand rabbits; some of the implants were loaded immediately and others were left unloaded. Eighteen animals were used in the experiment. Each received 4 titanium grade 5 mini-implants (2.0 x 6.0 mm), 2 of which were immediately loaded with 1 N of force. Tissue healing was verified at 1, 4, and 12 weeks after placement. Four different fluorescent molecules were injected into the rabbits to label calcium deposition. After the rabbits were killed, mineralized bone samples with the mini-implants were removed, fixed, cut, stained, and observed with bright-field, polarized, and fluorescence microscopy. After 12 weeks of healing, higher bone contact and bone area were observed than after 1 or 4 weeks, regardless of loading. Differences between the loaded and unloaded groups were not observed (P <0.05) at 1 and 4 weeks. The bone deposition rate was higher in the loaded group. The 1-N immedi...Continue Reading

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Citations

Nov 28, 2013·L' Orthodontie française·Cesare Luzi, Valeriano Luzi
Sep 7, 2012·European Journal of Orthodontics·Masahiro IijimaItaru Mizoguchi
Jun 10, 2011·The Journal of Oral Implantology·Özgür ErdoganKenan Daglıoglu
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Jan 23, 2013·Archives of Oral Biology·Paula V P Oltramari-NavarroJames A McNamara

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