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:: دوره 1، شماره 1 و 1 - ( مجموعه مقالات ارتودنسی 1390 ) ::
جلد 1 شماره 1 و 1 صفحات 0-0 برگشت به فهرست نسخه ها
Effects of insertion angle and implant thread type on the fracture properties of orthodontic mini-implants during insertion
چکیده:   (1852 مشاهده)

 Objective:

  To determine the effects of insertion angle (IA) and thread type on the fracture properties of orthodontic mini-implants (OMIs) during insertion.

 Materials and Methods:

 A total of 100 OMIs (self-drilling cylindrical 11 mm in length) were allocated into 10 groups according to thread type (dual or single) and IA (0°, 8°, 13°, 18°, and 23°) (n  =  10 per group). The OMIs were placed into artificial materials simulating human tissues: two-layer bone blocks (Sawbones), root (polymethylmethacrylate stick), and periodontal ligament (Imprint-II Garant light-body). Maximum insertion torque (MIT), total insertion energy (TIE), and peak time (PT) were measured and analyzed statistically.

 Results:

  There were significant differences in MIT, TIE, and PT among the different IAs and threads (all P < .001). When IA increased, MIT increased in both thread groups. However, TIE and PT did not show significant differences among 0°, 8°, and 13° IAs in the dual-thread group or 8°, 13°, and 18° IAs in the single-thread group. The dual-thread groups showed higher MIT at all IAs, higher TIE at 0° and 23° IAs, and longer PT at a 23° IA than the single-thread groups. In the 0°, 8°, and 13° IA groups, none of the OMIs fractured or became deformed. However, in the 18° IA group, all the OMIs were fractured or deformed. Dual-thread OMIs showed more fracturing than deformation compared to single-thread OMIs (P < .01). In the 23° IA group, all OMIs penetrated the artificial root without fracturing and deformation.

 Conclusions:

  When OMIs contact artificial root at a critical contact angle, the deformation or fracture of OMIs can occur at lower MIT values than those of penetration.


 Source: The Angel Orthodontists

 Full Text

واژه‌های کلیدی: Fracture properties، Mini-implant، Insertion angle، Implant thread type
     
نوع مطالعه: پژوهشي | موضوع مقاله: ارتودنسی
دریافت: 1392/7/6 | انتشار: 1390/10/25
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Effects of insertion angle and implant thread type on the fracture properties of orthodontic mini-implants during insertion. 1. 1390; 1 (1 و 1)

URL: http://idai.ir/article-1-2026-fa.html



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Creative Commons License این مقاله تحت شرایط Creative Commons Attribution-NonCommercial 4.0 International License قابل بازنشر است.
دوره 1، شماره 1 و 1 - ( مجموعه مقالات ارتودنسی 1390 ) برگشت به فهرست نسخه ها
جامعه اسلامی دندانپزشکان Islamic Dental Association of IRAN

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