Apical stress distribution on maxillary central incisor during various orthodontic tooth movements by varying cemental and two different periodontal ligament thicknesses: A FEM study

Vikram, N Raj; Kumar, KS Senthil; Nagachandran, K. S.

doi:10.4103/0970-9290.100429

Cited by 24 publications

(40 citation statements)

References 29 publications

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“…The Autodesk AutoCAD software has been used in previous dental studies, including for root canal apical transportation evaluations, dentinal sealer penetration depth analyses and the determination of cemental and periodontal ligament thicknesses during various orthodontic tooth movements; however, there have been no reported studies regarding its use for experimental periapical lesion detection and quantification [17][18][19][20]. In line with our results, previous studies showed that the Autodesk AutoCAD software is reliable and can precisely calculate periapical region surface areas.…”

Section: Gradation Of the Experimentally Induced Mouse Periapical Lessupporting

confidence: 85%

Gradation criteria for experimentally induced periapical lesions in mice

Velickovic¹,

Slobodanka²,

Tatjana³

et al. 2013

Ser J Exp Clin Res

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A periapical lesion occurs as periapical tissue reacts to a dental pulp anaerobic infection. Th is phenomenon may result from carious lesions, tooth fractures, or iatrogenic and other circumstances that allow for bacteria to penetrate into the pulpal tissues. Objectives: Th is study histologically evaluated experimentally induced periapical lesions using the Autodesk Au-toCAD 2010 software. Additionally, based on the amounts of alveolar bone destruction sizes in the mouse model regions, a proposed experimental periapical lesion gradation criterion was created. Methods: Twelve BALB/c mice were utilizised in a periapical model, whereby their mandibular right fi rst molars were coronally opened, allowing for pulp exposure to host oral bacterial fl ora. Th ese mice were sacrifi ced two and four weeks following pulp exposure. Following each sacrifi ce, hemi-mandibles were fi xed in 4% paraformaldehyde, decalcifi ed in 3% formic acid, embedded in paraffi n and cut into 4-μm-thick sections. Th e sections were stained with haematoxylin-eosin and examined with light microscopy (40x). Section images that included the mandibular fi rst molar distal roots and passed through the apical foramens were selected for analysis. Th e periodontal ligament sizes were measured using the Autodesk AutoCAD 2010 software. Results: Th ere was a highly signifi cant lesgion size difference at the two diff erent time points following the lesion induction (p=0.002). Th e periapical lesions were classifi ed according to periapical bone resorption sizes. We determined the values of quartiles (25% and 75%) and median areas (50%) of the mean lesion values at both experimental periods. Th ese data enabled for scoring of the lesions with grades from 1 to 4. Th e area of the normal periodontal ligament space was assigned with a grade of 0. Conclusion: Th is newly designed gradation criteria represent a signifi cant advantage compared with the previous descriptive methods used for determining periapical tissue bone destruction levels. It Th e criteria achieves this advantage by excluding subjectivity, facilitating a numerical presentation of the data and reducing the possibility of making errors by using the highly availably Autodesk AutoCAD 2010 software.

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Section: Gradation Of the Experimentally Induced Mouse Periapical Lessupporting

confidence: 85%

Gradation criteria for experimentally induced periapical lesions in mice

Velickovic¹,

Slobodanka²,

Tatjana³

et al. 2013

Ser J Exp Clin Res

View full text Add to dashboard Cite

show abstract

“…A similar stress and strain distribution was demonstrated by Rudolph et al and Vikram et al, but they demonstrated the results achieved by forces whose values were more than twice as high and on healthy periodontium. 29,30 During orthodontic intrusion, the stress concentration occurs on a very small surface present on the alveolus bottom and the root apex. That is why it is so crucial to apply the lowest yet still effective forces.…”

Section: Discussionmentioning

confidence: 99%

Orthodontic intrusion of periodontally-compromised maxillary incisors: 3-dimensional finite element method analysis

et al. 2017

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Background. Loading of the compromised periodontium with orthodontic forces produces different results than those achieved in patients with healthy periodontal support. Determining the force value at a level preventing further deterioration of the patient's periodontal status, thus delivering the most precisely individualized "dose" of loading, seems to be crucial for the successful intrusion of teeth with reduced periodontal support.

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“…[19] Numeric studies have helped explain how root resorption might be initiated by hydrostatic compressive stress-induced tissue necrosis. [19, 20]…”

Section: Root Strain As a Testable Mechanism Of Earr In Animal Modelsmentioning

confidence: 99%

Bone Density and Dental External Apical Root Resorption

Iglesias-Linares

Morford

Hartsfield

2016

Curr Osteoporos Rep

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When orthodontic patients desire shorter treatment times with aesthetic results and long-term stability, it is important for the orthodontist to understand the potential limitations and problems that may arise during standard and/or technology-assisted accelerated treatment. Bone density plays an important role in facilitating orthodontic tooth movement (OTM), such that reductions in bone density can significantly increase movement velocity. Lifestyle, genetic background, environmental factors and disease status all can influence a patients’ overall health and bone density. In some individuals, these factors may create specific conditions that influence systemic-wide bone metabolism. Both genetic variation and the onset of a bone-related disease can influence systemic bone density and local bone density, such as is observed in the mandible and maxilla. These types of localized density changes can affect the rate of OTM and may also influence the risk of unwanted outcomes, i.e., the occurrence of dental external apical root resorption (EARR).

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Apical stress distribution on maxillary central incisor during various orthodontic tooth movements by varying cemental and two different periodontal ligament thicknesses: A FEM study

Abstract: The study concluded that the clinical delivery of an orthodontic forces will cause stress in the cementum and PDL. Hence, it is necessary to limit the orthodontic force to prevent root resorption.

Cited by 24 publications

References 29 publications

Gradation criteria for experimentally induced periapical lesions in mice

Gradation criteria for experimentally induced periapical lesions in mice

Orthodontic intrusion of periodontally-compromised maxillary incisors: 3-dimensional finite element method analysis

Bone Density and Dental External Apical Root Resorption

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