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Biomechanics of bone screws – A clinical evaluation


Mobina Mollaie
Postgraduate Student, Dept. of Orthodontics, Dental School, Tehran Islamic Azad University
Alireza Jaffari
Assistant Professor, Dept. of Orthodontics, Dental School, Tehran Islamic Azad University


The mode of anchorage facilitated by implant systems has a unique characteristic owing to their temporary use, which result in a transient, albeit absolute anchorage.  Orthodontic treatment with temporary skeletal anchorage move teeth within biological limits using the same principles as conventional mechanotherapy.  However, a good understanding of characteristic features of bone screws along with proper biomechanical treatment principles can minimize side effects while maximizing the efficiency of temporary anchorage system. A microimplant can be placed in many different areas of the mouth and at different heights on the gingiva relative to the occlusal plane, creating several biomechanical orientations, such as low, medium and high pull mechanics.  A well positioned bone screw can provide favorable temporary skeletal anchorage but cannot offer an ideal force system, and it is the orthodontist who will design the required biomechanics depending on the type of malocclusion and tooth movement.
The experience with temporary skeletal anchorage is relatively new and therefore, the treatment mechanics of temporary skeletal anchorage are limited.
In this presentation we have revealed the biomechanical issues, limitations and advantages of using bone screws.  The consequence of using bone screws are highlighted with many clinical cases. Failures, too, were shown and explained.  Some of the cases were even evaluated clinically as well as radiographically for dental as well as skeletal changes.
The results of this discussion showed that the bone screws are capable of extending the borders of tooth movement within the envelope of discrepancy with a greater denotalveolar changes. However, a constant evaluation and re-evaluation of biomechanical consideration is required.
In conclusion it should be noted that with bone screws the system is not self locking and the changes are not limited to dentition alone, therefore, there is possibility of orthopedic changes too.


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محل نشر یا ارائه:  کنگره 10 انجمن ارتودنتیست ها
سال ایرانی :  1391
موضوع:  ارتودنسی
Level:  Postgraduate

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