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Klein-Franke E, Youssef E, Keilig L, Bourauel C, Dörsam I. Periapical surgery and different root obturation protocols for upper central incisor: A finite elements analysis. Ann Anat 2024; 256:152325. [PMID: 39197665 DOI: 10.1016/j.aanat.2024.152325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2024] [Revised: 08/14/2024] [Accepted: 08/23/2024] [Indexed: 09/01/2024]
Abstract
BACKGROUND The aim of this study was to determine the effect of root canal filling using different obturation materials combined with apicoectomy in upper central incisors under loading with 1 N and 100 N. The effect of incomplete root formation was also investigated. METHODS Based on a CBCT-scan, a model of an upper central incisor was created. The model was altered to simulate different clinical situations: root canal treatment, apicoectomy at two different lengths and with different obturation protocols, and immature root formation after trauma. In each model the tooth was loaded with 1 and 100 N, and peak Von Mises stress of bone and tooth, elastic strain of the periodontal ligament, as well as rotation and displacement of the tooth were measured. RESULTS Periapical surgery increases stress in dentin and the surrounding bone. Different obturation materials only produce minor differences in a coronally intact tooth. CONCLUSIONS Interincisal angle or loading direction strongly affects all measured values and needs to be considered when planning periapical surgery or comparing finite element analysis. Immature roots show the highest stress values in this study, reaching half the yield strength of dentine.
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Affiliation(s)
- E Klein-Franke
- Oral Technology, University of Bonn, Welschnonnenstr. 17, Bonn 53111, Germany
| | - E Youssef
- Department of Periodontology, Operative and Preventive Dentistry, University of Bonn, Welschnonnenstr. 17, Bonn 53111, Germany
| | - L Keilig
- Oral Technology, University of Bonn, Welschnonnenstr. 17, Bonn 53111, Germany; Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School, University of Bonn, Welschnonnenstr. 17, Bonn 53111, Germany
| | - C Bourauel
- Oral Technology, University of Bonn, Welschnonnenstr. 17, Bonn 53111, Germany
| | - I Dörsam
- Oral Technology, University of Bonn, Welschnonnenstr. 17, Bonn 53111, Germany; Department of Prosthetic Dentistry, Preclinical Education and Materials Science, Dental School, University of Bonn, Welschnonnenstr. 17, Bonn 53111, Germany.
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Patil PG, Seow LL, Uddanwadikar R, Pau A, Ukey PD. Different implant diameters and their effect on stress distribution pattern in 2-implant mandibular overdentures: A 3D finite element analysis study. J Prosthet Dent 2024; 131:675-682. [PMID: 35667890 DOI: 10.1016/j.prosdent.2022.04.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2022] [Revised: 04/18/2022] [Accepted: 04/19/2022] [Indexed: 11/28/2022]
Abstract
STATEMENT OF PROBLEM The edentulous mandible is commonly treated with a 2-implant overdenture. A change in diameter of the implants may affect the biomechanical behavior of the overdenture, but information on these effects is lacking. PURPOSE The purpose of this 3D finite element analysis study was to evaluate the biomechanical behavior of 2-implant mandibular overdentures (2IMO) and their individual components by using implants of different diameters. MATERIAL AND METHODS A 3D mandibular model was obtained from the cone beam computed tomography (CBCT) images of a 59-year-old edentulous man, and a 3D denture model was developed from intraoral scanning files in the Mimics software program. A 3D model of different diameters of implants (2.5 mm, 3.0 mm, 3.5 mm, and 4.0 mm) with a LOCATOR attachment was developed in the Solidworks software program. Two same-sized implants were inserted in the mandibular model at 10 mm from the midline in the 3Matics software program. A vertical load of 100 N was applied on the first molar region on the right side or both sides in the ANSYS software program. The maximum von Mises stresses and strains were recorded and analyzed. RESULTS Stresses within the implants decreased with an increase in diameter (from 2.5 mm to 3 mm, 3.5 mm, and 4.0 mm) of the implants. The highest stresses were observed with 2.5-mm-diameter implants (0.949 MPa under unilateral and 0.915 MPa under bilateral loading) and the lowest with Ø4-mm implants (0.710 MPa under unilateral and 0.703 MPa under bilateral loading). The strains on the implants ranged between 0.0000056 and 0.0000097, and those on the mandible ranged between 0.0000513 and 0.0000566 across all diameters of the implants without following a specific trend. CONCLUSIONS In 2IMO, the stresses in the implants and mandible decreased with an increase in the diameter of the implants. The implants of lesser diameter (2.5 mm) exhibited the highest stresses and strains, and the implants of the largest diameter (4 mm) exhibited the lowest stresses and strains under unilateral and bilateral loading conditions.
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Affiliation(s)
- Pravinkumar G Patil
- Senior Lecturer in Prosthodontics, Division of Restorative Dentistry, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia.
| | - Liang Lin Seow
- Professor, Division of Restorative Dentistry, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia
| | - Rashmi Uddanwadikar
- Associate Professor, Department of Mechanical Engeneering, Visvesvaraya National University of Technology, Nagpur, India
| | - Allan Pau
- Professor, Division of Oral Health Sciences, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia
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Güzelce S E. Biomechanical comparison of different framework materials in mandibular overdenture prosthesis supported with implants of different sizes: a finite element analysis. BMC Oral Health 2023; 23:450. [PMID: 37408011 DOI: 10.1186/s12903-023-03080-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2023] [Accepted: 05/25/2023] [Indexed: 07/07/2023] Open
Abstract
BACKGROUND The aim of this study is to evaluate the stresses on the supporting bone, implants, and framework materials under masticatory forces in mandibular overdenture prostheses modeled with different framework materials and different implant types, using the Finite Element Analysis (FEA). METHODS For the finite element modeling, two identical mandibular jaw models were created; one with two standard (diameter:4.1 mm/12 mm length) and the other with two mini-implants (diameter:2.4 mm/12 mm length) were placed in the canine teeth area. The polymethylmethacrylate (PMMA) denture was modeled upon them, supported by Cobalt Chromium alloy (CoCr), Poly-ether ether ketone (PEEK), and Zantex materials with framework. No framework was added as a control model; only PMMA overdenture prosthesis was modeled. RESULTS Regardless of the framework materials of the overdenture prostheses, the stress values on mini-implants in all models yielded approximately two times higher results comparing to standard implants. More stress transmission was observed in the supporting bone and implants in the control prostheses and overdenture prostheses supported with respectively PEEK, Zantex, CoCr alloy frameworks, respectively. In the framework materials, more stress occurred on CoCr, Zantex and PEEK in that order. CONCLUSION In the light of this study, the use of mini-implants as an alternative to standard implants is not promising in terms of distribution and transmission of chewing stresses. As a framework material, standard rigid metal alloys were found to be more advantageous than polymer materials in terms of stress distribution.
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Affiliation(s)
- Elifnur Güzelce S
- Department of Prosthodontics, University of Health Sciences Turkey, Hamidiye Campus (Istanbul) Selimiye Mah. Tıbbiye Cad. No:38, Üsküdar/Istanbul, 34668, Türkiye.
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Ganesh T, Scully J, Walker MP, Petrie CS. Biomechanical Evaluation of Mandibular Overdentures Supported by Mini-Implants: A Finite Element Analysis. J MECH MED BIOL 2022. [DOI: 10.1142/s0219519422500543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Gibreel M, Sameh A, Hegazy S, Närhi TO, Vallittu PK, Perea-Lowery L. Effect of specific retention biomaterials for ball attachment on the biomechanical response of single implant-supported overdenture: A finite element analysis. J Mech Behav Biomed Mater 2021; 122:104653. [PMID: 34229172 DOI: 10.1016/j.jmbbm.2021.104653] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 05/03/2021] [Accepted: 06/16/2021] [Indexed: 12/13/2022]
Abstract
PURPOSE The purpose of this finite element analysis (FEA) was to evaluate the effect of specific retention biomaterials with different elastic modulus on the biomechanical response to the axial and off-axial biting loads of a mandibular midline single implant-supported overdenture (SIO) model. METHODS Five 3-dimensional (3D) finite element models of an edentulous mandible with SIO were designed as follows: model M with a titanium retentive element for ball attachment, model P with a PEEK retentive element, model S with a silicone resilient liner retentive element, model T with a thermoplastic acrylic resin retentive element made from a CAD-CAM material, and model A with a polyacetal resin retentive element. Posterior bilateral vertical load (PV) at the 1st molar areas and anterior oblique load (AO) at the incisal edge of the mandibular central incisors at a 30-degree angle of 100 N were applied. Stress values were recorded. RESULTS Stress values were higher for all models under (AO) loading than under (PV) loading. Model M recorded the highest stress values on the implant, its components, cortical, and cancellous bone under both loading conditions. Under (AO) loading condition, the ball abutment von Mises stress value in model S was almost 7 times lower than that of model M (19 and 130 MPa respectively) and the other 3 models (P, T, and A) (119, 121, and 120 MPa respectively). However, model S recorded the highest value of denture base stress at the attachment area. CONCLUSIONS The elastic modulus of retention materials can affect stresses generated on the implant overdenture components and supporting structures.
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Affiliation(s)
- Mona Gibreel
- Department of Biomaterials Science and Turku Clinical Biomaterials Centre-TCBC, Institute of Dentistry, University of Turku, Turku, Finland.
| | - Ahmed Sameh
- Production Engineering Dept., Faculty of Engineering, Mansoura University, Mansoura, Egypt
| | - Salah Hegazy
- Professor and Chair of Department of Prosthodontics, Faculty of Dentistry, Mansoura University, Egypt
| | - Timo O Närhi
- Department of Prosthetic Dentistry, and Stomatognathic Physiology, University of Turku, Turku, Finland; and City of Turku, Welfare Division, Turku, Finland
| | - Pekka K Vallittu
- Professor, and Chair of Biomaterials Science Department, University of Turku, Turku, Finland; and City of Turku, Welfare Division, Turku, Finland
| | - Leila Perea-Lowery
- Department of Biomaterials Science, Turku Clinical Biomaterials Centre-TCBC, Institute of Dentistry, University of Turku, Turku, Finland
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da Costa Valente ML, Macedo AP, Reis A. Stress distribution analysis of novel dental mini-implant designs to support overdenture prosthesis. J ORAL IMPLANTOL 2021; 48:79-83. [PMID: 33690819 DOI: 10.1563/aaid-joi-d-19-00354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study aimed to test and compare two novel dental mini-implant designs to support overdentures with a commercial model, regarding the stress distribution, by photoelastic analysis. Three different mini-implant designs (Ø 2.0 mm × 10 mm) were tested: G1-experimental threaded (design with threads and 3 longitudinal and equidistant self-cutting chamfers), G2-experimental helical (design with 2 long self-cutting chamfers in the helical arrangement), and G3-Intra-Lock® System. After including the mini-implants in a photoelastic resin, they were subjected to a static load of 100 N under two situations: axial and inclined model (30°). The fringe orders (n), that represents the intensity of stresses were analyzed around the mini-implants body and quantified using Tardy's method that calculates the maximum shear stress (τ) value in each point selected. In axial models, less stress was observed in the cervical third mini-implants, mainly in G1 and G2. In inclined models (30°), higher stresses were generated on the opposite side of the load application, mainly in the cervical third of G2 and G3. All mini-implant models presented lower tensions in the cervical third compared with the middle and apical third. The new mini-implants tested (G1 and G2) showed lower stresses than the G3 in the cervical third under axial load, while loading in the inclined model generated greater stresses in the cervical of G2.
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Affiliation(s)
| | - Ana Paula Macedo
- PhD, Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil. Av. do Café, s/n, 14040-904, Ribeirão Preto - SP, Brazil. E-mail:
| | - Andréa Reis
- University of São Paulo Prosthesis and dental materials Av. Café, s/n° BRAZIL Ribeirão Preto São Paulo 14040-904 55 36024044 University of São Paulo
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Valente MLC, Bolfarini C, de Oliveira DP, Dos Reis AC. Dental mini-implant designs to support overdentures: Development, biomechanical evaluation, and 3D digital image correlation. J Prosthet Dent 2021; 128:754-763. [PMID: 33640085 DOI: 10.1016/j.prosdent.2020.06.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 06/26/2020] [Accepted: 06/29/2020] [Indexed: 11/17/2022]
Abstract
STATEMENT OF PROBLEM Custom mini-implants are needed for edentulous patients with extensive mandibular deficiencies where endosteal placement is not possible. However, the best design for these mini-implants is unclear. PURPOSE The purpose of this in vitro study was to develop 2 dental mini-implant designs to support mandibular overdentures and evaluate the effect of their geometries on primary stability and stress distribution. MATERIAL AND METHODS Two mini-implant designs were developed with changes in the shape, size, and arrangement of threads and chamfers. The experimental mini-implants were made of Grade V titanium alloy (Ti-6Al-4V), (Ø2.0×10 mm) and submitted to a nanoscale surface treatment. Thirty mini-implants (n=10) were placed into fresh swine bones: experimental-threaded, experimental-helical, and a commercially available product model (Intra-Lock System) as the control. The biomechanical evaluations of the experimental mini-implants were compared with those of the control in terms of primary stability, through insertion torque (IT), and with the pullout test. The analysis of stress distribution was performed by using the method of 3D digital image correlation under 250-N axial load and 100-N oblique (30-degree angled model) load. The data were analyzed by ANOVA and the Tukey HSD test (α=.05). RESULTS The IT and pullout test presented a statistically significant difference for all mini-implants (P<.05), with higher IT for the experimental-threaded and maximum pullout force for the control, followed by threaded (P=.001) and helical (P=.001). Regarding the 3D digital image correlation, a lower incidence of stress was found in the cervical third for all mini-implants. No statistically significant differences were found between the designs evaluated (P>.05). CONCLUSIONS Comparing the experimental mini-implants with the commercially available control, the experimental-threaded model presented greater primary stability, and all mini-implants showed less stress in the cervical third.
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Affiliation(s)
- Mariana L C Valente
- Posdoctoral student, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, (USP), Ribeirão Preto, São Paulo, Brazil
| | - Claudemiro Bolfarini
- Full Professor, Department of Materials Engineering, Federal University of São Carlos, (UFScar), São Carlos, São Paulo, Brazil
| | - Diego P de Oliveira
- Post-doctor, Department of Materials Engineering, Federal University of São Carlos, (UFScar), São Carlos, São Paulo, Brazil
| | - Andréa C Dos Reis
- Associate Professor, Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, (USP), Ribeirão Preto, São Paulo, Brazil.
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Complete mechanical characterization of an external hexagonal implant connection: in vitro study, 3D FEM, and probabilistic fatigue. Med Biol Eng Comput 2018; 56:2233-2244. [PMID: 29949022 DOI: 10.1007/s11517-018-1846-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 05/12/2018] [Indexed: 10/14/2022]
Abstract
The aim of this study was to fully characterize the mechanical behavior of an external hexagonal implant connection (ø3.5 mm, 10-mm length) with an in vitro study, a three-dimensional finite element analysis, and a probabilistic fatigue study. Ten implant-abutment assemblies were randomly divided into two groups, five were subjected to a fracture test to obtain the maximum fracture load, and the remaining were exposed to a fatigue test with 360,000 cycles of 150 ± 10 N. After mechanical cycling, all samples were attached to the torque-testing machine and the removal torque was measured in Newton centimeters. A finite element analysis (FEA) was then executed in ANSYS® to verify all results obtained in the mechanical tests. Finally, due to the randomness of the fatigue phenomenon, a probabilistic fatigue model was computed to obtain the probability of failure associated with each cycle load. FEA demonstrated that the fracture corresponded with a maximum stress of 2454 MPa obtained in the in vitro fracture test. Mean life was verified by the three methods. Results obtained by the FEA, the in vitro test, and the probabilistic approaches were in accordance. Under these conditions, no mechanical etiology failure is expected to occur up to 100,000 cycles. Graphical abstract ᅟ.
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Lohmann A, Keilig L, Heinemann F, Bourauel C, Hasan I. Numerical investigation of complete mandibular dentures stabilized by conventional or mini implants in patient individual models. BIOMED ENG-BIOMED TE 2018; 64:103-110. [DOI: 10.1515/bmt-2017-0137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 11/20/2017] [Indexed: 11/15/2022]
Abstract
Abstract
Poor stability of a complete denture is a common problem due to bone atrophy of the edentulous ridge. The aim of the present study was to analyze denture stability after receiving implants and to study the biomechanical properties of denture implants and the bone bed using conventional or mini implants. Five models based on computed tomography (CT) data of edentulous patients were created. The overdentures’ connection to the implants was assured by means of ball head abutments and rubber rings. In three models, the denture was supported by two to four conventional implants and in two models, the overdenture was supported by three to five mini implants. The dentures were loaded according to the individual biting forces which was clinically measured by means of pressure sheets. After implantation, the biting forces and displacements of overdentures increased in comparison to complete dentures. Displacements and stresses were higher with mini implants than with conventional ones. Stress in the implants was markedly below the yield stress of titanium grade 5 (880 MPa). An increase in the stress in the bone around the implants was noticed as compared to the situation with complete dentures which was below the physiological range of bone loading (<4 MPa).
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