Effect of different mucosa thickness and resiliency on stress distribution of implant-retained overdentures-2D FEA

Barão, Valentim Adelino Ricardo; Assunção, Wirley Gonçalves; Tabata, Lucas Fernando; Sousa, Edson Antônio Capello; Rocha, Eduardo Passos

doi:10.1016/j.cmpb.2008.07.009

Cited by 58 publications

(39 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…4,6,7,11,21,22,32 Thus, the association of dental implants and attachment system is used in such cases to provide additional retention, improve support and stability of obturator. 5,7,24,25 According to current results, it can be seen that the attachment system directly influences the number and distribution of tension, which corroborates with other studies [4][5][6][7][8][9]12 which have highlighted that these systems would exert an important role in stress distribution around the anchorages. Table 1 Number of photoelastic fringes according to the element in which the load was applied.…”

Section: Discussionsupporting

confidence: 79%

“…We believe that the BOD system has the highest value due to the smaller resilience of the clip which causes the load to be transferred to the bar and thus to the implants. Similar results were found by Ben-Ur et al, 33 Celik and Uludag, 13 and Barão et al, 9 who observed lower stress values in the bar-clip system associated with distal resilient attachments when compared with the bar-clip system. The authors also affirm that the combination of distal O-rings to the bar-clip system creates a fulcrum line in the distal portion that makes the prosthesis anteroposteriorly rotate around this fulcrum, and due to elasticity module of the ball system's resilient matrix, the stress magnitude of the implants is reduced.…”

Section: Attachment Systemsupporting

confidence: 80%

“…[1][2][3] Allied to implants, different types of attachment systems are usually indicated for improving the retention and stability of overdentures, [4][5][6][7][8] such as ball systems, magnet, and bars, and it is also possible to associate them with one another. 4,5,[7][8][9][10][11] The dental literature has shown many studies that approach the distribution of forces in order to collect better background information for planning of overdentures. 4,5,[7][8][9]12 A photoelasticity method through images has been widely applied in dentistry and allows a direct observation of stress distribution on structures, based on the ability of certain transparent materials to display color standards named isochromatic fringes when they are loaded and observed through a polarized light.…”

Section: Introductionmentioning

confidence: 99%

“…4,5,[7][8][9][10][11] The dental literature has shown many studies that approach the distribution of forces in order to collect better background information for planning of overdentures. 4,5,[7][8][9]12 A photoelasticity method through images has been widely applied in dentistry and allows a direct observation of stress distribution on structures, based on the ability of certain transparent materials to display color standards named isochromatic fringes when they are loaded and observed through a polarized light. 4,5,7,13 Thereby, this study aimed to evaluate the stress distribution through the photoelastic method in implant-retained palatal obturators over two parallel implants and one tilted using different attachment systems and conventional obturator (without implants).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Stress analysis in oral obturator prostheses over parallel and tilted implants: photoelastic imaging

et al. 2013

View full text Add to dashboard Cite

Abstract. This study aimed to evaluate the stress distribution through the photoelastic method in implant-retained palatal obturators prostheses. Two photoelastic models with bucco-sinusal communication were fabricated, one model without implants and another with two parallel implants and one tilted in the molar region. A conventional obturator prosthesis and five implant-retained obturators dentures with different attachment systems were fabricated: OR, three individualized O-rings; BC, bar clip; BOC, implants splinted by bars associated with two O-rings positioned at the center of the bar; OD, implants splinted by bars associated with two O-rings positioned in distal cantilever; and BOD, implants splinted by bars with clips associated with two O-rings positioned in distal cantilever. Each assembly (model/attachment system/prosthesis) was positioned in a circular polariscope and a load of 100 N was applied on each implant. The results were obtained by observing the photographic record of the tensions in the photoelastic models resulting from the application of load. It can be observed that a larger amount of stress fringes on BC system. It was concluded that the attachment system has a direct influence on the stress distribution of implant-retained obturator prostheses, with the three individualized O-rings exhibiting the lowest stress values, and tilted implants presented a biomechanical behavior similar to parallel implants. © The Authors.Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

show abstract

Section: Discussionsupporting

confidence: 79%

Section: Attachment Systemsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stress analysis in oral obturator prostheses over parallel and tilted implants: photoelastic imaging

et al. 2013

View full text Add to dashboard Cite

show abstract

“…In a study by Barão et al . , who compared the mucosal thickness and the maximum stress distribution, a mucosal thickness of 3 mm resulted in the least amount of stress, while thinner (1 mm) or thicker (5 mm) mucosas increased the stress. These findings are similar those in this study, with reliner material thicker or thinner than 2 mm resulting in an increase in the maximum stress values, considering the elasticity of the reliner material is similar to the mucosa as reported by other authors .…”

Section: Discussionmentioning

confidence: 99%

Analysis of stress on mucosa and basal bone underlying complete dentures with different reliner material thicknesses: a three‐dimensional finite element study

Lima

Orsi

Borie

et al. 2013

J of Oral Rehabilitation

View full text Add to dashboard Cite

The aim of this study was to determine the optimal thickness of reliner material that provides the least amount of stress on thin mucosa and supporting bone in patients with complete removable dentures using a three-dimensional finite element analyses. The model was obtained from two CT scans of edentulous mandibles with dentures supported by the alveolar ridge. After virtual reconstruction, the three-dimensional models were exported to the solidworks cad software and divided into six groups based on the thickness of the reliner material as follows: (i) without material, (ii) 0·5 mm, (iii) 1 mm, (iv) 1·5 mm, (v) 2 mm and (vi) 2·5 mm. The applied load was 60 N and perpendicular to the long axis of the alveolar ridge of all the prosthetic teeth, and the mucosal thickness used was 1 mm. The analyses were based on the maximum principal stress in the fibromucosa and the minimum principal stress in the basal bone. Stress concentration was observed in the anterior zone of the mandible in the mucosa and in the bone. The maximum and minimum principal stress in the mucosa and bone, respectively, decreased, whereas the thickness of the reliner material increased until 2 mm, which transmitted the lowest stress, compared with the control. Reliner materials with a thickness of 2·5 mm showed higher stress values than those with a thickness of 2 mm. In conclusion, reliner material with a thickness of 2 mm transmitted the lowest amount of stress to the mucosa and bone in 1 mm of mucosa thickness.

show abstract

Investigation of dental elastomers as oral mucosa simulant materials

Choi

Chen

Waddell

2021

Clinical & Exp Dental Res

View full text Add to dashboard Cite

Objective: To measure mechanical properties of dental soft liners in tensional stress to identify their suitability as human oral mucosa simulant materials.Methods: Eleven different dental elastomers were subjected to tensile testing to obtain their tensile strength and elastic moduli (n = 15/group) according to the ISO-527 method. Fractured surfaces of one specimen per sample group were examined under the light microscope and scanning electron microscope (SEM). Energy-dispersive X-ray spectroscopy (EDS) was performed for the elemental analysis or chemical characterization of each sample group. The obtained data were quantitatively and qualitatively analysed. They were also statistically analysed using SPSS version 25. Results:The tensile strength of dental elastomers ranged from 0.43 MPa (±0.09) to 7.41 MPa (±1.11) and had statistically significant differences between tested groups (p = 0.001). Vertex soft heat-cure soft liner, GC impression silicones and Silagum soft liners were found to have tensile strengths close to that of the oral mucosa reported by previous studies. SEM analysis revealed that the elastomers with higher filler contents showed rough fractured surface with plucking of particles after tensile fracture. Conclusion:This is the first study assessing the suitability of dental elastomers as human oral mucosa simulant materials which can be used for in vitro, mathematical modeling and finite element analysis (FEA) to study masticatory force distribution in oral mucosa. Out of 11 studied, six (Vertex Soft, GC heavy and Light body, Molloplast B, Algin X Ultra and Exaclear) dental elastomers showed similar mechanical properties to the Theil embalmed gingival tissues. Vertex Soft, GC Light body, and Molloplast B may be used for the majority of oral mucosal model when considering tensile strength as the primary factor for mechanical stimulation.

show abstract

Effect of different mucosa thickness and resiliency on stress distribution of implant-retained overdentures-2D FEA

Cited by 58 publications

References 25 publications

Stress analysis in oral obturator prostheses over parallel and tilted implants: photoelastic imaging

Stress analysis in oral obturator prostheses over parallel and tilted implants: photoelastic imaging

Analysis of stress on mucosa and basal bone underlying complete dentures with different reliner material thicknesses: a three‐dimensional finite element study

Investigation of dental elastomers as oral mucosa simulant materials

Contact Info

Product

Resources

About