The Influence of Custom-Milled Framework Design for an Implant-Supported Full-Arch Fixed Dental Prosthesis: 3D-FEA Study

Tribst, João Paulo Mendes; Giudice, Roberto Lo; Bottino, Marco Antônio; Epifania, Ettore; Ausiello, Pietro

doi:10.3390/ijerph17114040

Cited by 42 publications

(51 citation statements)

References 40 publications

(59 reference statements)

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“…Apart from the material, the custom-milled framework design also influences the stress distribution [ 25 ]. In conventional maxillary overdentures that do not require palatal coverage, the stresses tend to be concentrated in the distal of the last implant, in the cantilever region [ 30 ].…”

Section: Discussionmentioning

confidence: 99%

“…External hexagon implants (10 × 4.1 mm), previously modeled [ 25 ] were selected. The platform had a diameter of 4.1 mm, similar to a regular conventional implant.…”

Section: Methodsmentioning

confidence: 99%

“…Results were reported in von Mises stress [ 25 ] distribution for the framework, implants and screw; and in microstrains (με) for bone tissue [ 49 ].…”

Section: Methodsmentioning

confidence: 99%

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Stress distribution on different bar materials in implant-retained palatal obturator

et al. 2020

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Implant-retained custom-milled framework enhances the stability of palatal obturator prostheses. Therefore, to evaluate the mechanical response of implant-retained obturator prostheses with bar-clip attachment and milled bars, in three different materials under two load incidences were simulated. A maxilla model which Type IIb maxillary defect received five external hexagon implants (4.1 x 10 mm). An implant-supported palatal obturator prosthesis was simulated in three different materials: polyetheretherketone (PEEK), titanium (Ti:90%, Al:6%, V:4%) and Co-Cr (Co:60.6%, Cr:31.5%, Mo:6%) alloys. The model was imported into the analysis software and divided into a mesh composed of nodes and tetrahedral elements. Each material was assumed isotropic, elastic and homogeneous and all contacts were considered ideal. The bone was fixed and the load was applied in two different regions for each material: at the palatal face (cingulum area) of the central incisors (100 N magnitude at 45°); and at the occlusal surface of the first left molar (150 N magnitude normal to the surface). The microstrain and von-Mises stress were selected as criteria for analysis. The posterior load showed a higher strain concentration in the posterior peri-implant tissue, near the load application side for cortical and cancellous bone, regardless the simulated material. The anterior load showed a lower strain concentration with reduced magnitude and more implants involving in the load dissipation. The stress peak was calculated during posterior loading, which 77.7 MPa in the prosthetic screws and 2,686 με microstrain in the cortical bone. For bone tissue and bar, the material stiffness was inversely proportional to the calculated microstrain and stress. However, for the prosthetic screws and implants the PEEK showed higher stress concentration than the other materials. PEEK showed a promising behavior for the bone tissue and for the integrity of the bar and bar-clip attachments. However, the stress concentration in the prosthetic screws may represent an increase in failure risk. The use of Co-Cr alloy can reduce the stress in the prosthetic screw; however, it increases the bone strain; while the Titanium showed an intermediate behavior.

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Section: Discussionmentioning

confidence: 99%

“…External hexagon implants (10 × 4.1 mm), previously modeled [ 25 ] were selected. The platform had a diameter of 4.1 mm, similar to a regular conventional implant.…”

Section: Methodsmentioning

confidence: 99%

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Stress distribution on different bar materials in implant-retained palatal obturator

et al. 2020

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“…According to previous reported elastic modulus and Poisson ratio, nine different filling biomaterials were simulated (resin composite, bulk-fill resin composite, alkasite, flowable resin composite, glass ionomer cement, autocured resin-reinforced glass ionomer cement, resin cement, bulk-fill flowable resin composite, zinc oxide cement). The mechanical properties of each material/structure ( Table 1 ) were inserted into the analysis software and each material was considered as isotropic and homogeneous [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ].…”

Section: Methodsmentioning

confidence: 99%

Lithium Disilicate Ceramic Endocrown Biomechanical Response According to Different Pulp Chamber Extension Angles and Filling Materials

et al. 2021

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The purpose of this study is to evaluate the effect of pulp chamber extension angles and filling material mechanical properties on the biomechanical response of a ceramic endocrown. A 3D model of maxillary molar that underwent endodontically treatment was exported to computer aided design software to conduct finite element analysis (FEA). The endocrown model was modified considering different pulp chamber extension angles (right angle; 6°, 12° and 18° of axial divergence). The solids were imported into the computer aided engineering software in Standard for the Exchange of Product Data (STEP) format. Nine different filling materials were simulated to seal the orifice of the root canal system under each endocrown restoration (resin composite, bulk-fill resin composite, alkasite, flowable resin composite, glass ionomer cement, autocured resin-reinforced glass ionomer cement, resin cement, bulk-fill flowable resin composite, zinc oxide cement), totaling 36 models. An axial load (300 N) was applied at the occlusal surface. Results were determined by colorimetric graphs of von-Misses stress (VMS) and Maximum Principal Stress (MPS) on tooth, cement layer, and endocrown restorations. VMS distribution showed a similar pattern between the models, with more stress at the load region for the right-angled endocrowns. The MPS showed that the endocrown intaglio surface and cement layer showed different mechanical responses with different filing materials and pulp chamber angles. The stress peaks plotted in the dispersion plot showed that the filling material stiffness is proportional to the stress magnitude in the endocrown, cement layer and tooth adhesive surface. In addition, the higher the pulp chamber preparation angle, the higher the stress peak in the restoration and tooth, and the lower the stress in the cement layer. Therefore, 6° and 12° pulp chamber angles showed more promising balance between the stresses of the adhesive interface structures. Under the conditions of this study, rigid filling materials were avoided to seal the orifice of root canal system when an endocrown restoration was planned as rehabilitation. In addition, the pulp chamber axial walls were prepared between 6° and 12° of divergence to balance the stress magnitude in the adhesive interface for this treatment modality.

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“…Dental implant placement has become a routine procedure in oral rehabilitation of fully and partially edentulous patients, involving a great variation of implant prostheses due to the development of innovative surgical and prosthetic techniques [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

A Proposed Protocol for Ordinary and Extraordinary Hygienic Maintenance in Different Implant Prosthetic Scenarios

et al. 2021

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Prevention of peri-implantitis involves the early diagnosis of peri-implant mucositis. This article presents a protocol of hygienic maintenance in different implant prosthetic scenarios: single crown, fixed partial prosthesis, fixed full-arch, and overdentures. Others clinical conditions have to be taken into consideration: patient compliance; history of periodontitis; implants placed in augmented bone; short, zygomatic, pterygoid, and tilted implants; and complex prosthesis with false gingiva. Two levels of implant maintenance are described: ordinary, performed by dental hygienist, and extraordinary, carried out by both dentist and hygienist. Extraordinary maintenance also involves the removal and decontamination of the prosthetic structure. To obtain an effective prevention of peri-implantitis, one must plan ordinary and extraordinary hygiene in relation to the type of rehabilitation and clinical parameters.

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The Influence of Custom-Milled Framework Design for an Implant-Supported Full-Arch Fixed Dental Prosthesis: 3D-FEA Study

Cited by 42 publications

References 40 publications

Stress distribution on different bar materials in implant-retained palatal obturator

Stress distribution on different bar materials in implant-retained palatal obturator

Lithium Disilicate Ceramic Endocrown Biomechanical Response According to Different Pulp Chamber Extension Angles and Filling Materials

A Proposed Protocol for Ordinary and Extraordinary Hygienic Maintenance in Different Implant Prosthetic Scenarios

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