ISSN 2756-3421
African Journal of Dentistry ISSN 2756-3421 Vol. 8 (7), pp. 001-006, July, 2020. © International Scholars Journals
Full Length Research Paper
Animal experiment of periodontal tissue remodeling in application of mini-implant anchorage for incisor intrusion
Yi Hu1, Shengchao Wang1*, Yin Ding2*, Liping Su3 and Yan Wang1
1Department of Preventive Dentistry, School of Stomatology, The Fourth Military Medical University, Xi’an, Shaanxi, China.
2Department of Orthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an, Shaanxi, China.
3Clinic of sanatorium for army retired cadres, The Fourth Military Medical University, Xi’an, Shaanxi, China.
Accepted 14 January, 2020
Abstract
The aim of the present study is to observe the remodeling of periodontal tissue in application of mini-implant anchorage for incisor intrusion in dogs. Six adult male beagle dogs were used for the experiment. On the buccal site, a mini-implant was placed at the interalveolar septum between the maxillary second incisor and the third incisor on each side. The six maxillary incisors were connected together through the segmental wires and the individual bands were welded by brackets. An intrusive force (120 g) was applied by Ni-Ti coil spring on each side. An animal was sacrificed at the end of 0, 1, 3, 7, 14 and 30 days, respectively, after the activation. X-ray examination, HE staining and receptor activator of nuclear factor-kappa B ligand (RANKL) immunohistochemistry staining were performed afterwards. Then, we found that the periodontal tissue in apical area and crest of ridge remodeled most actively. In addition, the periodontal tissue on the buccal and the lingual sides also remodeled. In conclusion, the incisor teeth were not only intruded vertically but also showed rotation of the crown towards the labial side and the root towards the palatal side, by using mini-implants as anchorage. Besides, if the force applied was excessively large, it would cause apical root resorption.
Key words: Anchorage, mini-implant, incisor intrusion, and receptor activator of nuclear factor-kappa B ligand (RANKL).