Stress analysis on the free-end distal extension of an implant-supported mandibular complete denture

Greco, Gustavo Diniz; Jansen, Wellington Corrêa; Landre, Janis; Seraidarian, Paulo Isaías

doi:10.1590/s1806-83242009000200014

Cited by 28 publications

(19 citation statements)

References 13 publications

(20 reference statements)

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“…Compared to other in vitro methodologies, FEA produces results not only for a surface (photoelastic) but also for a punctual area (strain gauge), 19,20 being the only method to show the strain distribution inside the bone tissue, as commonly used. 21,22,23,24 To examine FEA results on implants, von Mises criteria was chosen to observe the regions with higher stress concentration. 25 To the best of the author's knowledge, there are no studies available in the literature associating implantoplasty and different heights of exposed implants.…”

Section: Discussionmentioning

confidence: 99%

Influence of implantoplasty on stress distribution of exposed implants at different bone insertion levels

2017

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This study evaluated the effect of implantoplasty on different bone insertion levels of exposed implants. A model of the Bone Level Tapered implant (Straumann Institute, Waldenburg, Switzerland) was created through the Rhinoceros software (version 5.0 SR8, McNeel North America, Seattle, WA, USA). The abutment was fixed to the implant through a retention screw and a monolithic crown was modeled over a cementation line. Six models were created with increasing portions of the implant threads exposed: C1 (1 mm), C2 (2 mm), C3 (3 mm), C4 (4 mm), C5 (5 mm) and C6 (6 mm). The models were made in duplicates and one of each pair was used to simulate implantoplasty, by removing the threads (I1, I2, I3, I4, I5 and I6). The final geometry was exported in STEP format to ANSYS (ANSYS 15.0, ANSYS Inc., Houston, USA) and all materials were considered homogeneous, isotropic and linearly elastic. To assess distribution of stress forces, an axial load (300 N) was applied on the cusp. For the periodontal insert, the strains increased in the peri-implant region according to the size of the exposed portion and independent of the threads' presence. The difference between groups with and without implantoplasty was less than 10%. Critical values were found when the inserted portion was smaller than the exposed portion. In the exposed implants, the stress generated on the implant and retention screw was higher in the models that received implantoplasty. For the bone tissue, exposure of the implant's thread was a damaging factor, independent of implantoplasty. Implantoplasty treatment can be safely used to control peri-implantitis if at least half of the implant is still inserted in bone.

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Section: Discussionmentioning

confidence: 99%

Influence of implantoplasty on stress distribution of exposed implants at different bone insertion levels

2017

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“…It was reported that in cantilevered prostheses, when a vertical load is applied on cantilevered FPDs, the most-distal implants represent a fulcrum, thus creating a class I lever system, which dramatically alters the magnitudes of the forces. 24,25 Studies demonstrated that stress values in the bone depend on both the framework and veneer materials. When findings from this study were analyzed, it was seen that the stress levels in the bone around the implants were lower in the models that used the FRC and particulate composite compared with those with a metal framework and porcelain veneer.…”

Section: Discussionmentioning

confidence: 99%

Influence of prosthesis type and material on the stress distribution in bone around implants: A 3-dimensional finite element analysis

Meriç¹,

Erkmen

Kurt

et al. 2011

Journal of Dental Sciences

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Background/purpose: The design and materials of a prosthesis affect the loading of dental implants and deformation of the bone. The aim of the study was to evaluate the effects of prosthesis design and materials on the stress distribution of implant-supported prostheses. Materials and methods: A 3-dimensional finite element analysis method was selected to evaluate the stress distribution in the bone. Three different models were designed as follows: a 3-unit implant-supported fixed partial denture (FPD) composed of a metal framework and porcelain veneer with (M2) or without a cantilevered extension (M1) and an FPD composed of a fiber-reinforced composite (FRC) framework and a particulate composite veneer without a cantilevered extension (M3). In separate load cases, 300-N vertical, 150-N oblique, and 60-N horizontal forces were applied to the prostheses in the models. von Mises stress values in the cortical and cancellous bone were calculated. Results: In cortical bone, the highest von Mises stresses were noted in the M2 Model with a vertical load; whereas, higher stresses were observed in the M1 Model with horizontal and oblique loads. The lowest stress values were determined in the M3 Model for all loading conditions. In cancellous bone, decreased stress values were found with all 3 models under the applied loads. Conclusions: Prosthesis design and materials affect the load-transmission mechanism. Although additional experimental and clinical studies are needed, FRC FPDs can be considered a suitable alternative treatment choice for implant-supported prostheses. Within the

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“…In general, every in vitro wear test setup has to face the limitations due to the enormous amount of different aspects affecting the in vivo wear processes 14,15,18,19,21,25,28 . The simulation is used to examine two different material combinations under defined conditions regarding one considerable aspect, in this study the wear stability.…”

Section: Discussionmentioning

confidence: 99%

Wear of double crown systems: electroplated vs. casted female part

et al. 2012

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ObjectivesThe wear of telescopic crowns is a common problem often reducing the patient's satisfaction with the denture and resulting in a renewal of the denture. The study aims to compare the wear behavior of conical crowns using electroplated copings (group E) with standard telescopic crowns with cast female parts (group C). Material and Methods10 conical crowns were milled for each group of a cast gold alloy. The specimen of group E had a conicity of 2º. The cast secondary crowns of group C had a 0º design. The electroplated coping was established by direct electroforming. An apparatus accomplishing 10,000 wear cycles performed the wear test. The retentive forces and the correlating distance during insertion and separation were measured. The wear test was separated in a start phase, an initial wear phase and the long term wear period. The retention force value and the force-distance integral of the first 0.33 mm of each cycle were calculated. ResultsThe retentive forces were significantly higher for group E and the integrals were significantly lower for this group except the integral at cycle 10,000. The changes of retention force and integral did not differ significantly between both groups in all phases. The change of the integrals as well as the integral at the particular cycles showed higher interquartile distances for group C. ConclusionsWithin the limitations of this study the tested conical crowns showed clinically acceptable retentive properties. The values reached a range comparable to retentive elements tested in recent literature. The values of group C showed higher ranges. The force measured for group E was significantly higher than for group C but the integrals showed an opposite tendency. The results indicate that an exclusive analysis of the force is not sufficient as the integral is not equivalent to the force although it describes the retentive property of the system in a better way than the force over a distance is described. Both systems seem to be suitable for clinical practice.

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Stress analysis on the free-end distal extension of an implant-supported mandibular complete denture

Cited by 28 publications

References 13 publications

Influence of implantoplasty on stress distribution of exposed implants at different bone insertion levels

Influence of implantoplasty on stress distribution of exposed implants at different bone insertion levels

Influence of prosthesis type and material on the stress distribution in bone around implants: A 3-dimensional finite element analysis

Wear of double crown systems: electroplated vs. casted female part

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