A Finite Element Analysis to Compare Stress Distribution on Extra-Short Implants with Two Different Internal Connections

García-Braz, Silvia Helena; Prados-Privado, María; Zanatta, Luiz Carlos Silveira; Calvo-Guirado, José Luís; Prados-Frutos, Juan Carlos; Gehrke, Sérgio Alexandre

doi:10.3390/jcm8081103

Cited by 17 publications

(18 citation statements)

References 43 publications

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“…Splinting implants also reduces biomechanical risks, such as those deriving from the crown-to-implant ratio, which may be unfavorable in some situations. However, most studies investigating crown-to-implant ratios with short and extra-short implants compared with implants longer than 8 mm have found that this factor has no influence on crestal bone stability or implant survival [19][20][21][42][43][44]. It should also be noted that studies using finite element analysis and clinical investigations of crown-to-implant ratio have reported a higher risk of potential prosthetic complications, such as the loosening of structures and possible fractures due to structural fatigue [45,46].…”

Section: Discussionmentioning

confidence: 99%

“…Studies using FEA (finite element analysis) of short implants have observed adequate biomechanical capacity in terms of the resistance to and distribution of forces compared with longer implants. In these studies comparing short implants with standard long implants, the application of forces oblique to the implants resulted in a similar stress concentration at the cervical region, and no changes in bone stress were observed due to an unfavorable crown-to-implant ratio; however, changes were observed in prosthetic component stress derived from the unfavorable crown-to-implant ratio [18][19][20]. Systematic reviews regarding the crown-to-implant ratio in single-tooth, non-splinted implants have not found any differences in complication rates between implants of up to 6 mm and longer implants [21].…”

Section: Introductionmentioning

confidence: 99%

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Prospective, Clinical Pilot Study with Eleven 4-Mm Extra-Short Implants Splinted to Longer Implants for Posterior Maxilla Rehabilitation

Torassa

Naldini

Calvo-Guirado

et al. 2020

JCM

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In many clinical situations, rehabilitation with implants in the posterior maxillary region is complicated by limited bone availability. In this context, the use of 4 mm long implants (known as extra-short implants) may be used thanks to the concept of osseointegration enhancement. It has been demonstrated that short implants offer an alternative to the regeneration procedures involved in placing longer implants in areas where bone height is compromised. This prospective pilot study tested a treatment protocol in which 11 extra-short (4 mm) implants were splinted to 11 mesially placed longer (8 mm) implants in the posterior maxillary regions of partially edentulous patients, without using supplementary bone regeneration procedures. Eleven patients were included in this single cohort study. The clinical performance of the extra-short implants was assessed during a two-year follow-up period, obtaining a 100% survival rate and mean bone loss of 0.3 mm. Implant stability measured by resonance frequency analysis (RFA) at the time of placement was 54.9 ± 4.9, increasing to 77.0 ± 2.6 at 24 months. The study demonstrated the gradual consolidation of osseointegration in bone of less-than-ideal quality in the posterior maxillary region. The results obtained show that a partially edentulous maxilla with reduced bone height may be rehabilitated by using an extra-short implant splinted to a mesial implant of 8mm length or longer. Despite the small sample size, this pilot study observed that extra-short implants achieved adequate bone stability and clinical performance after a 24-month follow-up.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prospective, Clinical Pilot Study with Eleven 4-Mm Extra-Short Implants Splinted to Longer Implants for Posterior Maxilla Rehabilitation

Torassa

Naldini

Calvo-Guirado

et al. 2020

JCM

View full text Add to dashboard Cite

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“…Then, the peri-implant bone was also subjected to the Mohr-Coulomb method, which allows the differentiation of the impact of tension and compression stresses to occur in a different way. In evaluating the flow limits of each structure, the values considered were as follows: for the titanium implant, the value of 1130 MPa corresponds to 100% [22] and, for bone tissue, 114 Mpa corresponds to 100% in situations of axial load application, and 50 Mpa corresponds to 100% in the application of angled loads [23].…”

Section: Plos Onementioning

confidence: 99%

Comparative analysis of stress distribution in one-piece and two-piece implants with narrow and extra-narrow diameters: A finite element study

et al. 2021

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Objectives The aim of this in vitro study was to evaluate the stress distribution on three implant models with narrow and extra-narrow diameters using the finite element method (FEA). Materials and methods Dental implants of extra-narrow diameter of 2.5 mm for a one-piece implant (group G1), a narrow diameter of 3.0 mm for a one-piece implant (group G2) and a narrow diameter of 3.5 mm for a two-piece implant with a Morse taper connection (group G3). A three-dimensional model was designed with cortical and cancellous bone, a crown and an implant/abutment set of each group. Axial and angled (30°) loads of 150 N was applied. The equivalent von Mises stress was used for the implants and peri-implant bone plus the Mohr-Coulomb analysis to confirm the data of the peri-implant bone. Results In the axial load, the maximum stress value of the cortical bone for the group G1 was 22.35% higher than that the group G2 and 321.23% than the group G3. Whereas in angled load, the groups G1 and G2 showing a similar value (# 3.5%) and a highest difference for the group G3 (391.8%). In the implant structure, the group G1 showed a value of 2188MPa, 93.6% higher than the limit. Conclusions The results of this study show that the extra-narrow one-piece implant should be used with great caution, especially in areas of non-axial loads, whereas the one- and two-piece narrow-diameter implants show adequate behavior in both directions of the applied load.

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“…The results showed that there was no difference between the external hexagon and Morse taper system, regardless the bone level. [29][30][31][32] However, there was higher strain in the cervical and apical regions in the models with bone loss.…”

Section: Discussionmentioning

confidence: 99%

“…27,28 The unitary restorations are biomechanically complex, especially when replacing posterior missing elements, since the occlusal forces are higher, 21 which can lead to high stresses in the abutment and in the bone, making the system more susceptible to failure. 29 During the load dissipation, the lateral component of the force can be responsible for the torque moment, which have a destructive effect on the cortical bone and can cause complications in the long-term. 30 Frost (1994) 4 conceptualized that the mechanical stimuli in the bone can induce the predictable bone behavior.…”

Section: Discussionmentioning

confidence: 99%

The effect of different bone level and prosthetic connection on the biomechanical response of unitary implants: Strain gauge and finite element analyses

Datte¹,

Rodrigues²,

Datte³

et al. 2021

IJAERS

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Different prosthetic connections have emerged for better aesthetic and biomechanical performance to prevent peri-implant bone loss. The finite elements analysis and the strain gauge methodologies were used for the numerical analysis of the generated stress and the microstrain around the implants and their connections. Two implant models with the same length (13 x 3.75 mm) were analyzed according to the prosthetic connection: external hexagon or morse Taper. Both abutments received screw-retained metallic crowns in chromium-cobalt. The peri-implant tissue was simulated using polyurethane resin in two different heights (bone level and 5 mm of bone loss). A load of 300 N was applied on the occlusal surface. The results were analyzed in terms of von-Mises stress and micro strain. Samples identical to the numerical models were made for the Strain Gauge (SG) analysis; four SGs were bonded around the implant to obtain micro strain results. Finite element analysis and strain gauge corroborated in terms of similar mechanical response. Thus, there is no difference regarding the prosthetic connection for the generated stress and strain under axial load. However, bone loss increased the stress and strain magnitude for both prosthetic connections. In conclusion, both evaluated implant connections present similar biomechanical behavior regardless the bone height.Implants with internal conical connections (Morse Taper) have been associated with bone crest maintaining, avoiding screws loosening and fracture.

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A Finite Element Analysis to Compare Stress Distribution on Extra-Short Implants with Two Different Internal Connections

Cited by 17 publications

References 43 publications

Prospective, Clinical Pilot Study with Eleven 4-Mm Extra-Short Implants Splinted to Longer Implants for Posterior Maxilla Rehabilitation

Prospective, Clinical Pilot Study with Eleven 4-Mm Extra-Short Implants Splinted to Longer Implants for Posterior Maxilla Rehabilitation

Comparative analysis of stress distribution in one-piece and two-piece implants with narrow and extra-narrow diameters: A finite element study

The effect of different bone level and prosthetic connection on the biomechanical response of unitary implants: Strain gauge and finite element analyses

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