The purpose of this study was to evaluate morphological and biomechanical characteristics of a commercial mini-implant. Orthodontic low head mini implants, in the two available sizes of 1.5 and 2 mm, have been used. The electronic scanning microscope evaluation has been tested on 3 groups each one composed of 4 samples, observed in numerous enlargements and in the three dimensions of the space. The groups were composed of new mini implants, undamaged mini implants observed after their clinical use and mini-implants broken at the moment of their insertion or removal after their therapeutical use. The microscope analysis of unused mini implants has shown how the diameter reduction of the neck represents the area of greater weakness; such parameter is very important in determining screw resistance to fracture. In fact the fracture observed in vivo always happened to this degree. Some micro carvings and cracks were shown on the surface, these irregularities could facilitate or promote the enlargement of the cracking itself. From the results obtained it is clear that the steel is adequate for permanence in the oral cavity, and moreover the material itself is adapted to bear the pressure put on it during therapy. However, it remains advisable to make certain changes to better the surface and geometry of the miniscrews.

Casaglia, A., Dominici, F., Pachi', F., Turla', R., Cerroni, L. (2010). Morphological observations and fractological considerations on orthodontics miniscrews. MINERVA STOMATOLOGICA(59), 465-476.

Morphological observations and fractological considerations on orthodontics miniscrews

PACHI', FRANCESCO;TURLA', RUGGERO;CERRONI, LOREDANA
2010-03-01

Abstract

The purpose of this study was to evaluate morphological and biomechanical characteristics of a commercial mini-implant. Orthodontic low head mini implants, in the two available sizes of 1.5 and 2 mm, have been used. The electronic scanning microscope evaluation has been tested on 3 groups each one composed of 4 samples, observed in numerous enlargements and in the three dimensions of the space. The groups were composed of new mini implants, undamaged mini implants observed after their clinical use and mini-implants broken at the moment of their insertion or removal after their therapeutical use. The microscope analysis of unused mini implants has shown how the diameter reduction of the neck represents the area of greater weakness; such parameter is very important in determining screw resistance to fracture. In fact the fracture observed in vivo always happened to this degree. Some micro carvings and cracks were shown on the surface, these irregularities could facilitate or promote the enlargement of the cracking itself. From the results obtained it is clear that the steel is adequate for permanence in the oral cavity, and moreover the material itself is adapted to bear the pressure put on it during therapy. However, it remains advisable to make certain changes to better the surface and geometry of the miniscrews.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore MED/28 - Malattie Odontostomatologiche
English
Senza Impact Factor ISI
Orthodontic anchorage procedures, orthodontic appliance, dental implants
Casaglia, A., Dominici, F., Pachi', F., Turla', R., Cerroni, L. (2010). Morphological observations and fractological considerations on orthodontics miniscrews. MINERVA STOMATOLOGICA(59), 465-476.
Casaglia, A; Dominici, F; Pachi', F; Turla', R; Cerroni, L
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/62227
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