Optimization of Loading Condition for Maxillary Molar Intrusion with Midpalatal Miniscrews by Using Finite Element Analysis

Pooktuantong, Ornnicha; Ogasawara, Takeshi; Uezono, Masayoshi; Chantarawaratit, Pintu-on; Moriyama, Keiji

doi:10.3390/app112411749

Cited by 2 publications

(2 citation statements)

References 38 publications

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“…The finite element method was used in this study 23) . The reliability of the results was dependent on the accuracy of the models, and the experimental data obtained from CBCT of the volunteer were superior to those of the traditional acquisition method 24) .…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Maxillary First Molar Intrusion Mechanics with Mini-Implant Anchorages Using the Finite Element Method

Xiao

Pei

Xia

et al. 2023

J. Hard Tissue Biology.

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This study aimed to evaluate the effect of the maxillary first molar intrusion mechanics with mini-implant anchorages on the Von Mises stress and initial displacement using finite element analysis. A three-dimensional finite model was established using Mimics 17.0, Geomagic Studio 2014, Unigraphics NX 8.5 and Ansys workbench 15 software based on original cone beam computed tomography data. Four loading methods were used. The displacement of the maxillary first molar was calculated along the x-, y-and z-axes, and the von Mises stress distribution was visualized using color-coded scales. Most of the stress was concentrated on the cervical or middle third of the roots of the maxillary first molar and decreased toward the apex in all models. The minimum and more uniform stress distribution appeared around the apical third of the roots. The strongest stress on the periodontal ligament (PDL) and alveolar bone was always around the cervical and root furcation. After intrusion, the maxillary first molar was bodily intruded without tipping in model 1, whereas buccal tipping was observed in models 2 and 4. In model 3, the molar had the tendency of mesial-lingual rotation. The vertical displacements were 95.3%, 79.6%, 95.3% and 79.6% of the total displacements of models 1-4, respectively. All cusps were uniformly intruded in models 1 and 3. Buccal cusps were intruded 50% more than the lingual cusps in model 2. All of the cusps were intruded except for the distal-lingual cusp in model 4. The apical third of the roots suffered the minimum stress and was not prone to evident resorption during intrusion, whereas the maximum stress on PDL was also maintained within the normal physiological range. Four loading methods were available for intrusion. Model 1 was the best, followed by models 2, 3 and 4. The tooth cusp conditions should be considered during molar intrusion.

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Section: Discussionmentioning

confidence: 99%

Evaluation of Maxillary First Molar Intrusion Mechanics with Mini-Implant Anchorages Using the Finite Element Method

Xiao

Pei

Xia

et al. 2023

J. Hard Tissue Biology.

View full text Add to dashboard Cite

show abstract

“…The bilateral force, on the other hand, promotes more homogeneous stress distribution without evidence of dental tipping. Bilateral intrusion technique suggested a vertical movement of intrusion and lower probability of root apex resorption [16].…”

Section: Discussionmentioning

confidence: 99%

Use of Temporary Anchorage Devices in Intrusion of Supraerupted Molars-Case Reports

Trpevska¹,

Tanatarec

Shushak³

et al. 2022

JMS

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Early loss of mandibular permanent molars with supraeruption of maxillary permanent molars is a common clinical finding causing functional posterior occlusion problems. Rehabilitation of the stomatognathic system often requires preprosthodontic intervention with molar intrusion which is one of the most difficult movements in orthodontic mechanics requiring efficient anchorage to achieve success.The aim of this study was to present two case reports, with orthodontic mini-implants used for molar intrusion as preprosthetic treatment, reducing the need for prosthetic crown reduction in patients with edentulous space discrepancy. With the aid of chain elastics, the force of intrusion passing through the center of resistance of the tooth, supraerupted maxillary molars were intruded approximately 0.5 mm per month. The intrusive tooth movement maintained the vitality of the intruded teeth and was not aggressive to the periodontal structures, did not cause root resorption and no change of the pulp flow was detected. In contrast to traditional orthodontics, mini-implants were demonstrated to be clinically efficient in providing sufficient anchorage against orthodontic forces. With these devices, using well-controlled magnitude and direction of the force, we reestablished successfully the functional posterior occlusion. By presenting these case reports, we emphasize the versatility of orthodontic mini-implants as a form of temporary anchorage devices (TADs) in the biomechanics of molar intrusion attempted to create interocclusal space for adequate prosthodontic restoration with osseointegrated implants and prosthesis.

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Optimization of Loading Condition for Maxillary Molar Intrusion with Midpalatal Miniscrews by Using Finite Element Analysis

Cited by 2 publications

References 38 publications

Evaluation of Maxillary First Molar Intrusion Mechanics with Mini-Implant Anchorages Using the Finite Element Method

Evaluation of Maxillary First Molar Intrusion Mechanics with Mini-Implant Anchorages Using the Finite Element Method

Use of Temporary Anchorage Devices in Intrusion of Supraerupted Molars-Case Reports

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