کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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3117336 | 1582746 | 2011 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Histologic evaluation of root response to intrusion in mandibular teeth in beagle dogs Histologic evaluation of root response to intrusion in mandibular teeth in beagle dogs](/preview/png/3117336.png)
IntroductionThe purpose of this article was to histologically evaluate root resorption and repair after orthodontic intrusion with different force magnitudes and fixed anchorage.MethodsA randomized split-mouth repeated-measure design was used. Intrusive forces were applied for 98 days to the mandibular second, third, and fourth premolars of 8 mature beagle dogs. Two miniscrew implants were used as anchorage to apply constant intrusive forces of 50, 100, or 200 g per tooth. Demineralized sections of each tooth were stained and histologically studied for root resorption. Multilevel statistical procedures were used to evaluate the results.ResultsRoot resorption was present in all teeth, independent of the force applied. Significant differences were found between root regions, with the apices and the interradicular regions the most affected and with dentin involvement at the furcation. There was cementum repair in 24.14% of the lacunae. Light constant intrusive forces between 50 and 200 g showed no significant differences in the amount of resorption produced. Resorption was more frequently seen at the level of the apices and the furcation.ConclusionsOrthodontically induced root resorption is not clinically significant after application of continuous intrusive forces between 50 and 200 g. Moreover, there is no relationship between root resorption, the position of posterior mandibular teeth in the arch, and the amount of intrusive force applied.
Journal: American Journal of Orthodontics and Dentofacial Orthopedics - Volume 139, Issue 1, January 2011, Pages 60–69