Alveolar bone resorption and the center of resistance modification (3-D analysis by means of the finite element method)

Geramy, Allahyar

doi:10.1016/s0889-5406(00)70159-4

Cited by 91 publications

(74 citation statements)

References 13 publications

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“…The average CR in the BL direction was located more occlusally than in some previous studies (43.5% 20 and 53.8% 11 ), close to the finding in one study (58% 23 ), and lower than the finding in another (66% 5 ). The potential explanations of the difference could be attributed to the sample size, reference point, and tooth difference.…”

supporting

confidence: 74%

Estimating the location of the center of resistance of canines

Jiang

Kula

Chen

2015

The Angle Orthodontist

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Objective: To develop a method to quickly estimate the location of center of resistance (CR) in mesial-distal (MD) and buccal-lingual (BL) directions from the tooth's image. Materials and Methods: The maxillary cone-beam computed tomography (CBCT) scans of 18 patients were used. Finite element (FE) models of the canines and their surrounding tissues were built based on their CBCT scans to calculate the locations of CR. Root length, centroid of the contact surface (CCS), and centroid of projection of the contact surface (CPCS) were also obtained from the images. The CCS and CPCS locations were projected on the tooth's long axis, which were represented as percentages of the root length measured from the root's apex. Results: Using the FE results as the standards, the errors of using CCS or CPCS to estimate CR were calculated. The average location of CR calculated using the FE method was 60.2% measured from the root's apex in the MD direction and 58.4% in the BL direction. The location of the CCS was 60.9%. The difference in CR was 0.7% in the MD direction and 2.5% in the BL direction. The location of CPCS was 60.2% in the MD direction and 59.1% in the BL direction, which resulted in a 0.1% and 0.8% difference with the reference CR, respectively. The average difference of CR in the MD and BL directions was small but statistically significant (P , .05). Conclusion: The locations of the CR of a human canine in the MD and BL directions can be estimated by finding the CPCSs in those directions. (Angle Orthod. 2016;86:365-371.)

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supporting

confidence: 74%

Estimating the location of the center of resistance of canines

Jiang

Kula

Chen

2015

The Angle Orthodontist

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“…Secondly, upper alveolar bone loss is attributed to an intrinsic configuration. For upper anterior alveolar bone configuration, the alveolar process consists of palatal and buccal cortical plates and the cancellous trabeculae (Geramy, 2000).…”

Section: Discussionmentioning

confidence: 99%

Three-dimensional evaluation of upper anterior alveolar bone dehiscence after incisor retraction and intrusion in adult patients with bimaxillary protrusion malocclusion

Guo

Zhang

Liu

et al. 2011

J. Zhejiang Univ. Sci. B

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Abstract:Objective: The purpose of this study was to evaluate three-dimensional (3D) dehiscence of upper anterior alveolar bone during incisor retraction and intrusion in adult patients with maximum anchorage. Methods: Twenty adult patients with bimaxillary dentoalveolar protrusion had the four first premolars extracted. Miniscrews were placed to provide maximum anchorage for upper incisor retraction and intrusion. A computed tomography (CT) scan was performed after placement of the miniscrews and treatment. The 3D reconstructions of pre-and post-CT data were used to assess the dehiscence of upper anterior alveolar bone. Results: The amounts of upper incisor retraction at the edge and apex were (7.64±1.68) and (3.91±2.10) mm, respectively, and (1.34±0.74) mm of upper central incisor intrusion. Upper alveolar bone height losses at labial alveolar ridge crest (LAC) and palatal alveolar ridge crest (PAC) were 0.543 and 2.612 mm, respectively, and the percentages were (6.49±3.54)% and (27.42±9.77)%, respectively. The shape deformations of LAC-labial cortex bending point (LBP) and PAC-palatal cortex bending point (PBP) were (15.37±5.20)° and (6.43±3.27)°, respectively. Conclusions: Thus, for adult patients with bimaxillary protrusion, mechanobiological response of anterior alveolus should be taken into account during incisor retraction and intrusion. Pursuit of maximum anchorage might lead to upper anterior alveolar bone loss.

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“…Using FEA, stress and strain response to foreign forces in living structures can be predicted. This method has been successfully applied for biomechanical studies and its efficiency has been confirmed (11)(12)(13)(14).…”

Section: Introductionmentioning

confidence: 87%

The Role of Loop Height and Design on its Force Characteristics in Alignment of Teeth: A Finite Element Analysis

Shahroudi

2016

Iran J Ortho

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Objectives: The aim of this study was to assess the effects of different orthodontic vertical loop height and design on its force characteristics at different amount of loop activation by means of finite element method (FEM) analysis. Results:The results of this study showed that the minimum amount of force was delivered by double vertical helical open loop with the height of 7 mm at the activation of 0.1 mm which was about 1.06E-01 N. The maximum amount of force was 2.2199 N which was delivered by double vertical open loop with height of 6mm at 1 mm activation. At each amount of activation the value of exerted force followed this order: DVOL 6 mm > DVOL 7 mm > DVHOL 6 mm > DVHOL 7 mm.Conclusions: According to this FEM study, considering its limitations, adding a helix in a double vertical open loop as well as increasing the height of loop can reduce the value of delivered force.

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Alveolar bone resorption and the center of resistance modification (3-D analysis by means of the finite element method)

Cited by 91 publications

References 13 publications

Estimating the location of the center of resistance of canines

Estimating the location of the center of resistance of canines

Three-dimensional evaluation of upper anterior alveolar bone dehiscence after incisor retraction and intrusion in adult patients with bimaxillary protrusion malocclusion

The Role of Loop Height and Design on its Force Characteristics in Alignment of Teeth: A Finite Element Analysis

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