Cargando…

Assessment of the Maximum Amount of Orthodontic Force for PDL in Intact and Reduced Periodontium (Part I)

This study examines 0.6 N and 1.2 N as the maximum orthodontic force for periodontal ligament (PDL) at multiple levels of periodontal breakdown, and the relationships with the ischemic, necrotic, and resorptive risks. Additionally, this study evaluates if Tresca failure criteria is more adequate for...

Descripción completa

Detalles Bibliográficos
Autores principales: Moga, Radu Andrei, Olteanu, Cristian Doru, Botez, Mircea, Buru, Stefan Marius
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9914466/
https://www.ncbi.nlm.nih.gov/pubmed/36767254
http://dx.doi.org/10.3390/ijerph20031889
_version_ 1784885676748046336
author Moga, Radu Andrei
Olteanu, Cristian Doru
Botez, Mircea
Buru, Stefan Marius
author_facet Moga, Radu Andrei
Olteanu, Cristian Doru
Botez, Mircea
Buru, Stefan Marius
author_sort Moga, Radu Andrei
collection PubMed
description This study examines 0.6 N and 1.2 N as the maximum orthodontic force for periodontal ligament (PDL) at multiple levels of periodontal breakdown, and the relationships with the ischemic, necrotic, and resorptive risks. Additionally, this study evaluates if Tresca failure criteria is more adequate for the PDL study. Eighty-one 3D models (from nine patients; nine models/patients) with the 2nd lower premolar and different degrees of bone loss (0–8 mm) where subjected to intrusion, extrusion, rotation, translation, and tipping movements. Tresca shear stress was assessed individually for each movement and bone loss level. Rotation and translation produced the highest PDL stresses, while intrusion and extrusion determined the lowest. Apical and middle third PDL stresses were lower than the cervical stress. In intact periodontium, the amount of shear stress produced by the two investigated forces was lower than the 16 KPa of the maximum physiological hydrostatic pressure (MHP). In reduced periodontium (1–8 mm tissue loss), the apical amount of PDL shear stress was lower than MHP for both applied forces, while cervically for rotation, translation and tipping movements exceeded 16 KPa. Additionally, 1.2 N could be used in intact periodontium (i.e., without risks) and for the reduced periodontium only in the apical and middle third of PDL up to 8 mm of bone loss. However, for avoiding any resorptive risks, in the cervical third of PDL, the rotation, translation, and tipping movements require less than 0.2–0.4 N of force after 4 mm of loss. Tresca seems to be more adequate for the study of PDL than other criteria.
format Online
Article
Text
id pubmed-9914466
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-99144662023-02-11 Assessment of the Maximum Amount of Orthodontic Force for PDL in Intact and Reduced Periodontium (Part I) Moga, Radu Andrei Olteanu, Cristian Doru Botez, Mircea Buru, Stefan Marius Int J Environ Res Public Health Article This study examines 0.6 N and 1.2 N as the maximum orthodontic force for periodontal ligament (PDL) at multiple levels of periodontal breakdown, and the relationships with the ischemic, necrotic, and resorptive risks. Additionally, this study evaluates if Tresca failure criteria is more adequate for the PDL study. Eighty-one 3D models (from nine patients; nine models/patients) with the 2nd lower premolar and different degrees of bone loss (0–8 mm) where subjected to intrusion, extrusion, rotation, translation, and tipping movements. Tresca shear stress was assessed individually for each movement and bone loss level. Rotation and translation produced the highest PDL stresses, while intrusion and extrusion determined the lowest. Apical and middle third PDL stresses were lower than the cervical stress. In intact periodontium, the amount of shear stress produced by the two investigated forces was lower than the 16 KPa of the maximum physiological hydrostatic pressure (MHP). In reduced periodontium (1–8 mm tissue loss), the apical amount of PDL shear stress was lower than MHP for both applied forces, while cervically for rotation, translation and tipping movements exceeded 16 KPa. Additionally, 1.2 N could be used in intact periodontium (i.e., without risks) and for the reduced periodontium only in the apical and middle third of PDL up to 8 mm of bone loss. However, for avoiding any resorptive risks, in the cervical third of PDL, the rotation, translation, and tipping movements require less than 0.2–0.4 N of force after 4 mm of loss. Tresca seems to be more adequate for the study of PDL than other criteria. MDPI 2023-01-19 /pmc/articles/PMC9914466/ /pubmed/36767254 http://dx.doi.org/10.3390/ijerph20031889 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Moga, Radu Andrei
Olteanu, Cristian Doru
Botez, Mircea
Buru, Stefan Marius
Assessment of the Maximum Amount of Orthodontic Force for PDL in Intact and Reduced Periodontium (Part I)
title Assessment of the Maximum Amount of Orthodontic Force for PDL in Intact and Reduced Periodontium (Part I)
title_full Assessment of the Maximum Amount of Orthodontic Force for PDL in Intact and Reduced Periodontium (Part I)
title_fullStr Assessment of the Maximum Amount of Orthodontic Force for PDL in Intact and Reduced Periodontium (Part I)
title_full_unstemmed Assessment of the Maximum Amount of Orthodontic Force for PDL in Intact and Reduced Periodontium (Part I)
title_short Assessment of the Maximum Amount of Orthodontic Force for PDL in Intact and Reduced Periodontium (Part I)
title_sort assessment of the maximum amount of orthodontic force for pdl in intact and reduced periodontium (part i)
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9914466/
https://www.ncbi.nlm.nih.gov/pubmed/36767254
http://dx.doi.org/10.3390/ijerph20031889
work_keys_str_mv AT mogaraduandrei assessmentofthemaximumamountoforthodonticforceforpdlinintactandreducedperiodontiumparti
AT olteanucristiandoru assessmentofthemaximumamountoforthodonticforceforpdlinintactandreducedperiodontiumparti
AT botezmircea assessmentofthemaximumamountoforthodonticforceforpdlinintactandreducedperiodontiumparti
AT burustefanmarius assessmentofthemaximumamountoforthodonticforceforpdlinintactandreducedperiodontiumparti