Abstract
To morphologically evaluate the active tip of six different types of self-drilling mini-implants for orthodontic anchorage. Images of the active tips of the mini-implants were obtained with a Zeiss optical microscope Stemi 200-C, with magnification of 1.6X. The images of the surface were viewed with the Axio Vision program (Zeiss, Jena, Germany) to calculate linear and angular measures. Mini-implant morphology and the details of tips and threads were also evaluated through Scanning Electronic Microscopy (SEM) (JEOL, model JSM5800 LV - JEOL, Tokyo, Japan) with magnifications of 90X and 70X, respectively. The evaluation of the mini-implant taper shape was assessed using the formula: (b - a) / (2 x D). The following variables were measured: (1) active tip width, (2) major diameter of external thread, (3) minor diameter of internal thread and taper of the mini-implant, (4) number of threads and lead of the screw, (5) angle of thread, (6) flank width and (7) pitch width. Mini-implants from different manufacturers presented active tips with different characteristics. Mechanical testing is necessary to correlate the analyzed characteristics aiming to determine the best performance.
Highlights
MATERIAL AND METHODS Orthodontic self-drilling mini-implants from six different manufacturers with similar dimensional characteristics were used according to Table 1
The images obtained on the Scanning Electronic Microscopy (SEM) of the mini-implant, the details of the screw and the tip of the six types of mini-implants are displayed on Figures 4, 5 and 6
Rev Dental Press Ortod Ortop Facial. 2006;11(4):[126-56]
Summary
Orthodontic self-drilling mini-implants from six different manufacturers with similar dimensional characteristics were used according to Table 1. Mini-implant morphology evaluation The morphology of the active part of the mini-implants was evaluated and identified by an observer calibrated and trained, by means of images obtained through the Zeiss optical microscope, Stemi 2000-C (Zeiss, Jena, Germany) with magnification of 1.6X. The surface images were analyzed with the Axio vision program (Zeiss, Jena, Germany) to calculate the linear and angular measures (Figs 1 and 2). The mini-implant morphology and the details of the tips and of the mini-implant were evaluated through a scanning electronical microscope (SEM) (JEOL, model JSM-5800 LV - JEOL, Tokyo, Japan) with magnification of 90X and 70X respectively. The evaluation of the mini-implant taper was calculated according to the formula: (b - a) / (2 x D) = mini-implant taper (Fig 3). The mini-implant shank is considered as its external diameter excluding the thread width
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