Finite Element Analysis (FEA) of Palatal Coverage on Implant Retained Maxillary Overdentures

Fernandez, Mônica Ammon; Subramanian, N.R.; Nawrocki, M.; Nawrocki, Anne; Craighead, John Wesley; Clark, A. E.; O’Neill, Edgar; Esquivel‐Upshaw, Josephine F.

doi:10.3390/app10196635

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…Kim et al [35], in a study from 2016, suggested that full palatal coverage is more beneficial for stress distribution, while they preferred the usage of the Hader bar to the milled bar. On the other hand, Fernandez et al [36] found no significant difference under axial loading between the prosthesis with full palatal coverage and without palatal coverage when the bar was added. Under nonaxial loading, the decrease in stress was observed with the bar attachment in all sites, with the exception of the anterior implant site.…”

Section: Discussionmentioning

confidence: 96%

Biomechanical Analysis of Palateless Splinted and Unsplinted Maxillary Implant-Supported Overdentures: A Three-Dimensional Finite Element Analysis

Frolo,

Řehounek,

Jíra

et al. 2023

Materials

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The objective of this study was to compare the distribution of stress in the maxillary bone, dental implants, and prosthetic components supporting implant-supported maxillary overdentures with partial palatal coverage, in both splinted and unsplinted designs. Two models of maxillary overdentures were designed using the Exocad Dental CAD program, which included cancellous and cortical bone. The complete denture design and abutments (locator abutments in the unsplinted and Hader bar with Vertix attachments placed distally in the splinted variant) were also designed. The denture material was PEEK (Polyetheretherketone), and the method used to analyze patient-specific 3D X-ray scans was 3D QCT/FEA (three-dimensional quantitative computed tomography-based finite element analysis). Loading was divided into three load cases, in the frontal region (both incisors of the denture) and distal region (both molars and first premolar of the denture). The forces applied were 150 N with an oblique component with a buccal inclination of 35° in the frontal region, and 600 N with a buccal inclination of 5° (molars) or solely vertical (premolar) in the distal region. The model with locator abutments showed higher stresses in all load cases in both analyzed implant variants and in the maxilla. The differences in stress distribution between the splinted and unsplinted variants were more significant in the distal region. According to the results of the present study, the amount of stress in bone tissue and dental implant parts was smaller in the splinted, bar-retained variant. The findings of this study can be useful in selecting the appropriate prosthetic design for implant-supported maxillary overdentures with partial palatal coverage.

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Section: Discussionmentioning

confidence: 96%

Biomechanical Analysis of Palateless Splinted and Unsplinted Maxillary Implant-Supported Overdentures: A Three-Dimensional Finite Element Analysis

Frolo,

Řehounek,

Jíra

et al. 2023

Materials

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“…The particular parts described in the previous section were assembled in order to obtain the final finite element (FE) model of the overdenture prosthesis. Within the FE framework, linear 4-node elements [14] were assigned to the housing and linear 8-node brick elements [15] with reduced integration [16][17][18][19] to the prosthesis, bar, implants, clips, and edentulous mandible. The FE mesh was created to obtain a regular node pattern.…”

Section: Finite Element Methods Modelmentioning

confidence: 99%

Assessment of Contact Pressures between a Mandibular Overdenture and the Prosthodontic Area

et al. 2021

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In this paper, we assess the pressure between the overdenture located in the mandible and supported by a bar retained on two implants and the prosthodontic area. For testing, a model of an edentulous mandible was created using a mold by FRASACO with two implants and a “rider” bar inserted. A complete mandibular denture with polypropylene matrices was made. Three types of matrices of various stiffness were applied. The mandible and overdenture geometry was mapped using a digital image obtained with a Steinbichler Comet L3D 3D scanner. Finite element method calculations were performed in the Abaqus FEA software. The results demonstrate that the maximum contact pressure is observed when the loads are associated with canines. A critical case for the lower posterior is chewing performed by the molars. The pressure zone is the largest for POM-1 with Young’s modulus of 1.5 GPa and is reduced by 5.0% and 7.8% for POM-2 (E = 2.5 GPa) and POM-3 (E = 3.5 GPa), respectively. The stress distribution under the prosthesis mostly depends on the region loaded onto it. The applied load produces a slight contact pressure between the denture and the prosthodontic area in the anterior zone. A change in polypropylene matrix stiffness does not affect contact pressures.

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Biomechanical Analysis of Palatless Splinted and Unsplinted Maxillary Implant-supported Overdenture: A 3D Finite Element Analysis

Frolo,

Řehounek,

Jíra

et al. 2023

Preprint

View full text Add to dashboard Cite

The objective of this study was to compare the distribution of stress in the maxillary bone, dental implants, and prosthetic components supporting implant-supported maxillary overdentures with partial palatal coverage, in both splinted and unsplinted designs. Two models of maxillary overdentures were designed using the Exocad Dental CAD program, which included cancellous and cortical bone. The complete denture design and abutments (locator abutments in the unsplinted and Hader bar with Vertix attachments placed distally in the splinted variant) were also designed. The denture material was PEEK (Polyetheretherketone), and the method used to analyze patient-specific 3D X-ray scans was 3D QCT/FEA (Three-dimensional Quantitative Computed Tomography-Based Finite Element Analysis). Loading was divided into three load cases: frontal region (both incisors of the denture) and distal region (both molars and first premolar of the denture). The forces applied were 150 N with an oblique component with a buccal inclination of 35° in the frontal region, and 600 N with a buccal inclination of 5° (molars) or solely vertical (premolar) in the distal region. The model with locator abutments showed higher stresses in all load cases in both analyzed implant variants and in the maxilla. The differences in stress distribution between the splinted and unsplinted variants were more significant in the distal region. According to the results of the present study, the amount of stress in bone tissue and dental implant parts was smaller in the splinted, bar-retained variant. The findings of this study can be useful in selecting the appropriate prosthetic design for implant-supported maxillary overdentures with partial palatal coverage.

show abstract

Finite Element Analysis (FEA) of Palatal Coverage on Implant Retained Maxillary Overdentures

Cited by 3 publications

References 38 publications

Biomechanical Analysis of Palateless Splinted and Unsplinted Maxillary Implant-Supported Overdentures: A Three-Dimensional Finite Element Analysis

Biomechanical Analysis of Palateless Splinted and Unsplinted Maxillary Implant-Supported Overdentures: A Three-Dimensional Finite Element Analysis

Assessment of Contact Pressures between a Mandibular Overdenture and the Prosthodontic Area

Biomechanical Analysis of Palatless Splinted and Unsplinted Maxillary Implant-supported Overdenture: A 3D Finite Element Analysis

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