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Insertion torque of orthodontic miniscrews according to changes in shape, diameter and length.
Angle Orthod ; 78(2): 234-40, 2008 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-18251617
ABSTRACT

OBJECTIVE:

To determine the variation in the insertion torque of orthodontic miniscrews according to the screw length, diameter, and shape. MATERIALS AND

METHODS:

The maximum insertion torque (MIT) was measured using a torque tester at a constant speed of 3 rotations per minute. Cylindrical and taper type of miniscrews (Biomaterials Korea Inc, Seoul, Korea) with different lengths, diameters, and pitches were tested.

RESULTS:

The results showed that the insertion torque significantly increased with increasing screw length (P < .01). In particular, there was a significant increase in torque with increasing screw length and diameter (P < .01). An analysis of the serial insertion torque of miniscrews revealed the cylindrical type screw to have much higher insertion torque at the incomplete screw thread, while the taper type screw showed a much higher insertion torque at the final inclination part of the screw thread. The insertion torque was affected by the outer diameter, length, and shape in that order.

CONCLUSIONS:

An increase in screw diameter can efficiently reinforce the initial stability of the miniscrew, but the proximity of the root at the implanted site should be considered.
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Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Assunto principal: Parafusos Ósseos / Desenho de Aparelho Ortodôntico / Implantação Dentária Endo-Óssea / Procedimentos de Ancoragem Ortodôntica Idioma: Inglês Revista: Angle Orthod Ano de publicação: 2008 Tipo de documento: Artigo