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Camargos GDV, Lazari-Carvalho PC, Carvalho MAD, Castro MB, Neris NW, Del Bel Cury AA. 3D finite element model based on CT images of tooth. BRAZILIAN JOURNAL OF ORAL SCIENCES 2020. [DOI: 10.20396/bjos.v19i0.8658910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Aim: This study aimed the description of a protocol to acquire a 3D finite element (FE) model of a human maxillary central incisor tooth restored with ceramic crowns with enhanced geometric detail through an easy-to-use and low-cost concept and validate it through finite element analysis (FEA). Methods: A human maxillary central incisor was digitalized using a Cone Beam Computer Tomography (CBCT) scanner. The resulted tooth CBCT DICOM files were imported into a free medical imaging software (Invesalius) for 3D surface/geometric reconstruction in stereolithographic file format (STL). The STL file was exported to a computer-aided-design (CAD) software (SolidWorks), converted into a 3D solid model and edited to simulate different materials for full crown restorations. The obtained model was exported into a FEA software to evaluate the influence of different core materials (zirconia - Zr, lithium disilicate - Ds or palladium/silver - Ps) on the mechanical behavior of the restorations under a 100 N applied to the palatal surface at 135 degrees to the long axis of the tooth, followed by a load of 25.5 N perpendicular to the incisal edge of the crown. The quantitative and qualitative analysis of maximum principal stress (ceramic veneer) and maximum principal strain (core) were obtained. Results: The Zr model presented lower stress and strain concentration in the ceramic veneer and core than Ds and Ps models. For all models, the stresses were concentrated in the external surface of the veneering ceramic and strains in the internal surface of core, both near to the loading area. Conclusion: The described procedure is a quick, inexpensive and feasible protocol to obtain a highly detailed 3D FE model, and thus could be considered for future 3D FE analysis. The results of numerical simulation confirm that stiffer core materials result in a reduced stress concentration in ceramic veneer.
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Tribst JP, Kohn BM, de Oliveira Dal Piva AM, Spinola MS, Borges AL, Andreatta Filho OD. Influence of restoration thickness on the stress distribution of ultrathin ceramic onlay rehabilitating canine guidance: a 3D-finite element analysis. ACTA ACUST UNITED AC 2019; 68:126-131. [PMID: 31014062 DOI: 10.23736/s0026-4970.19.04183-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND The rehabilitation of canine guidance can be performed with adhesive indirect materials, but can the restoration thickness be reduced without mechanical disadvantages? Thus the goal of this study was to analyze the stress of upper canines which received different thicknesses of ceramic fragments for the rehabilitation of the canine guidance using finite element analysis. METHODS A superior canine was modeled using a computer aided design software. The dental tissues were individually shaped containing enamel, dentin and periodontal ligament. The following three different ceramic fragment thicknesses were then implemented: 0.3, 0.7 and 1.5 mm. Lithium disilicate was chosen as the ceramic material. The solid geometries were exported to the analysis software. The materials were considered isotropic, homogeneous and linear. The set was submitted to efforts in the incisal third in the palatine face to analyze maximal principal stress, mimicking mandibular lateral movement. The applied load was 100N, and the fixation region was on the medullary bone. RESULTS For restoration, the thinner the ceramic, the higher the stress concentration was; while for the adhesive surface of teeth, the thicker the ceramic, the higher the stress concentration. CONCLUSIONS The smaller the ceramic thickness was, the lower stress concentration showed at the adhesive interface, while the stress concentration was higher on the restoration intaglio surface.
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Affiliation(s)
- João P Tribst
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University, Unesp, São José dos Campos, SP, Brazil
| | - Bianca M Kohn
- Institute of Science and Technology, São Paulo State University, Unesp, São José dos Campos, SP, Brazil
| | - Amanda M de Oliveira Dal Piva
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University, Unesp, São José dos Campos, SP, Brazil -
| | - Manuela S Spinola
- Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University, Unesp, São José dos Campos, SP, Brazil
| | - Alexandre L Borges
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University, Unesp, São José dos Campos, SP, Brazil
| | - Osvaldo D Andreatta Filho
- Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University, Unesp, São José dos Campos, SP, Brazil
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Jung WK, Lee WS, Kwon HB. Effects of abutment screw preload in two implant connection systems: A 3D finite element study. J Prosthet Dent 2019; 122:474.e1-474.e8. [DOI: 10.1016/j.prosdent.2019.04.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 04/19/2019] [Accepted: 04/19/2019] [Indexed: 10/25/2022]
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Fabris V, Reginato VF, Smaniotto C, Bacchi A, Consani RLX. Treatment of Resorbed Mandibles with Titanium Plate and Immediate Implant-Supported Prosthesis - Case Series. Braz Dent J 2019; 30:244-251. [PMID: 31166396 DOI: 10.1590/0103-6440201902397] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2018] [Accepted: 01/19/2019] [Indexed: 01/06/2023] Open
Abstract
Severely resorbed mandibles with only cortical bone remaining can fracture during or after implant placement. This case series presents a technique to reduce the risk or the consequences of mandibular fracture. Seven patients with only cortical mandibular bone remaining were treated with the fixation of a titanium plate in the frontal surface previously to implant placement, during the same surgical procedure. Immediate complete-arch implant supported prosthesis were installed. Patient's systemic and local conditions that could influence implant survival were registered previously to surgery and during the follow up period. Biological and biomechanical complications were recorded. The condition of peri-implant tissues was evaluated. The follow-ups ranged from 12 to 84 months. Twenty-nine implants were placed and no implant failure or other biological complication was observed. The peri-implant tissue evaluation demonstrated most implants was surrounded by keratinized tissue (89.5%). No marginal recession (implant platform cervical to gingival margin) was observed. Probing depth was normal, ranging from 0 to 3 mm. Low scores of plaque index or bleeding on probing were recorded. Biomechanical complications evolved loosening of 4 prosthetic screws and 1 fractured. The use of a titanium plate for the fixation of severely resorbed mandibles with only cortical bone remaining was a safe treatment procedure, avoiding biological and major biomechanical complications in the treatment with immediate complete-arch implant-supported prosthesis.
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Affiliation(s)
- Vinicius Fabris
- Department of Oral Surgery, IMED - Faculdade Meridional, Passo Fundo, RS, Brazil
| | | | - Carolina Smaniotto
- Graduate Program in Dentistry, IMED - Faculdade Meridional, Passo Fundo, RS, Brazil
| | - Atais Bacchi
- Graduate Program in Dentistry, IMED - Faculdade Meridional, Passo Fundo, RS, Brazil
| | - Rafael Leonardo Xediek Consani
- Department of Prosthodontics and Periodontics, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil
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Influence of Implant Neck Design on Peri-Implant Tissue Dimensions: A Comparative Study in Dogs. MATERIALS 2018; 11:ma11102007. [PMID: 30336579 PMCID: PMC6212799 DOI: 10.3390/ma11102007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Revised: 09/26/2018] [Accepted: 10/06/2018] [Indexed: 11/28/2022]
Abstract
This in vivo study assessed (hard and soft) peri-implant tissue remodeling around implants with micro-ring and open-thread neck designs placed in a dog model. Twenty histological sections corresponding to four different implant designs that were placed in America Foxhound dogs were obtained from previous studies. All the implants had been placed under identical conditions and were divided into four groups: Group A, micro-rings on implant neck plus 0.5 mm refined surface; Group B, micro-rings on implant neck; Group C, open-thread neck; and, Group D, double-spiral neck. Eight weeks after surgery, the integrated implants were removed and processed for histological examination. Crestal bone loss and bone-to-implant contact was greater for micro-ring necks than open-thread necks. Soft tissues showed significant differences on both buccal and lingual aspects, so that the distance from peri-implant mucosa to the apical portion of the barrier epithelium was smaller in the micro-ring groups. So, in spite of generating greater bone-to-implant contact, implants with micro rings produced more bone loss than open-thread implants. Moreover, the outcomes that were obtained IPX implants smooth neck design produced less bone loss in the cervical area, following by Facility implants when compared with the other open thread and microthreaded implant designs. Implant thread design can influence on bone remodeling in the cervical area, related to bundle bone preservation.
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He Y, Hasan I, Keilig L, Fischer D, Ziegler L, Abboud M, Wahl G, Bourauel C. Biomechanical characteristics of immediately loaded and osseointegration dental implants inserted into Sika deer antler. Med Eng Phys 2018; 59:8-14. [PMID: 30017665 DOI: 10.1016/j.medengphy.2018.04.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Revised: 03/13/2018] [Accepted: 04/16/2018] [Indexed: 10/28/2022]
Abstract
This study aimed to compare biomechanical characteristics of immediately loaded (IL) and osseointegrated (OS) dental implants inserted into Sika deer antler and lay a foundation for developing an alternative animal model for dental implants studies. Two implants per antler were inserted. One implant was loaded immediately via a self-developed loading device; the other was submerged and unloaded as control. IL implants were harvested after different loading periods. The unloaded implants were collected after OS and the shedding of antler. Specimens were scanned by µCT scanner and finite element models were generated. A vertical force of 10 N was applied on the implant. The mean values of maximum displacements, stresses and strains were compared. The results showed that the density of antler tissue around the implants dramatically increased as the loading time increased. After shedding the antler, 3 pairs of antlers were collected and the density of antler tissue remained in a similar value in all specimens. The maximum values of displacement and stresses in implant and stresses and strains in antler tissue were significantly different among OS models. In one antler, all the biomechanical parameters of IL model were significantly higher than those of OS model of the same animal (P < 0.05) and wider distributions were obtained from IL model. It can be concluded that implants inserted into Sika deer antler might not disturb the growth and calcification process of antler and the use of Sika deer antler model is a promising alternative for implant studies that does not require animal sacrifice.
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Affiliation(s)
- Yun He
- Orofacial Reconstruction and Regeneration Laboratory, Department of Oral and Maxillofacial Surgery, the Hospital of Stomatology, Southwest Medical University, Luzhou, China; Oral Technology, Dental School, University of Bonn, Welschnonnenstr. 17, 53111 Bonn, Germany
| | - Istabrak Hasan
- Oral Technology, Dental School, University of Bonn, Welschnonnenstr. 17, 53111 Bonn, Germany; Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School, University of Bonn, Bonn, Germany.
| | - Ludger Keilig
- Oral Technology, Dental School, University of Bonn, Welschnonnenstr. 17, 53111 Bonn, Germany; Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School, University of Bonn, Bonn, Germany
| | - Dominik Fischer
- Raptor Center and Wildlife Parc Hellenthal, Hellenthal, Germany; Clinic for Birds, Reptiles, Amphibians and Fish, Veterinary Faculty, Justus Liebig University Giessen, Giessen, Germany
| | - Luisa Ziegler
- Clinic for Birds, Reptiles, Amphibians and Fish, Veterinary Faculty, Justus Liebig University Giessen, Giessen, Germany
| | - Markus Abboud
- Department of Prosthodontics and Digital Technology, School of Dental Medicine, Stony Brook University, 1104 Westchester Hall, Stony Brook, New York
| | - Gerhard Wahl
- Department of Oral Surgery, Dental School, University of Bonn, Bonn, Germany
| | - Christoph Bourauel
- Oral Technology, Dental School, University of Bonn, Welschnonnenstr. 17, 53111 Bonn, Germany
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