THE EFFECTS OF A MODERATE INTRUSIVE FORCE ON AFFECTED PERIODONTAL TISSUES. A FEM STUDY

Abstract

Introduction. Orthodontic treatment on patients with periodontal disease is a contemporary research topic because we have to focus not only on the perfect alignment of the teeth but also on preserving and even improving the periodontal condition. Material and methods .Using the FEM Catia V5R16 software we created a valid model of a mandible arch and of a lower central incisor. The lower central incisor was created on the computer taking into account certain specific dimensions and using a didactic real size Nissin model. Two additional models were created with a horizontal bone loss (HBL) of 33% and 66% around the tooth. A moderate intrusive force with the intensity of 1N was applied on the lower central incisor models. Results and discussions. We can notice that the equivalent tensions (σ eqv) at the level of the entire complex tooth-periodontal ligament-alveolar bone stay constant regardless the periodontal status. In a 66% HBL case we found out that σ c records 1,776 higher values than in no HBL case and 1,604 higher values than in 33% HBL. In a 66% horizontal bone loss we can state that f value is 1,948 times higher than in the 33% horizontal bone loss and 2,026 times higher than in no HBL case. Conclusions. Intrusion of the lower central incisor consecutive to periodontal disease is a realistic and viable solution for improving the implantation and gaining attachment.

Keywords

• Finite elements method
• intrusive force
• Orthodontic treatment
• periodontal tissues