Effect of Implant Platform Connection and Abutment Material on Removal Torque and Implant Hexagon Plastic Deformation

Pereira, Paulo Henrique de Souza; Amaral, Marina; Baroudi, Kusai; Vitti, Rafael Pino; Nassani, Mohammad Zakaria; Silva-Concílio, Laís Regiane

doi:10.1055/s-0039-1700662

Cited by 9 publications

(7 citation statements)

References 31 publications

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“…With more mechanical loading energy consumed by the wear formation in one‐piece zirconia specimens, less stress could be transmitted to the implant body. Second, one‐piece zirconia abutments tend to induce more abutment screw torque loss after artificial aging 41–43 . Although not significant enough to cause a detachment of the implant and abutment, such a torque loss could facilitate micro‐movement between the two components during the mechanical cyclic loading 44 .…”

Section: Discussionmentioning

confidence: 99%

“…Second, one-piece zirconia abutments tend to induce more abutment screw torque loss after artificial aging. [41][42][43] Although not significant enough to cause a detachment of the implant and abutment, such a torque loss could facilitate micro-movement between the two components during the mechanical cyclic loading. 44 This may cause a greater proportion of stress to be transmitted to the abutment screw instead of the implant compared with when the screw is tightly fastened.…”

Section: Implant Body Deformationmentioning

confidence: 99%

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Implant deformation and implant–abutment fracture resistance after standardized artificial aging: An in vitro study

Zhai

Nakano

Chen

et al. 2022

Clin Implant Dent Rel Res

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Background and purpose: Zirconia abutments have been widely adopted in clinical implant practice. The unique mechanical properties of zirconia may significantly affect the long-term prognosis of implant treatments. The purpose of this study was to investigate the influence of abutment material on implant deformation and fracture resistance of internal conical connection implant-abutment complexes of two diameters after standardized artificial aging.Materials and methods: Thirty original abutments (one-piece titanium, one-piece zirconia, zirconia with alloy base) with two diameters (regular, narrow) were connected to internal conical connection implants and subjected to a standardized artificial aging process consisting of thermal cycling and mechanical cyclic loading. Microcomputed tomography (μCT) scans of implant bodies were performed before and after aging.3-dimensional images of implant bodies were generated from the μCT scans and aligned for before and after aging to calculate the volumetric deformation amount.Finally, fracture resistance was measured using a mechanical static loading test for the surviving aged and 30 brand-new specimens.Results: All specimens survived artificial aging. No significant difference in implant deformation was found in the regular groups (p = 0.095). In narrow groups, the onepiece zirconia group showed significantly less deformation (p < 0.0001). For fracture resistance, no significant decrease was observed after aging in any group (p > 0.05).One-piece zirconia abutments showed significantly lower strength than the other two materials for both diameters (p < 0.0001). Conclusions:In the regular diameter system, abutment material had no significant influence on the tested mechanical property degradation after simulated long-term oral use. The mechanical performance of narrow diameter one-piece zirconia abutments differed from the other two materials. For optimal performance, one-piece zirconia abutments should be adopted only in anterior regions.

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Section: Discussionmentioning

confidence: 99%

Section: Implant Body Deformationmentioning

confidence: 99%

Implant deformation and implant–abutment fracture resistance after standardized artificial aging: An in vitro study

Zhai

Nakano

Chen

et al. 2022

Clin Implant Dent Rel Res

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“… 46 In addition, the difference in elastic modulus and hardness may lead to higher wear at the internal fixture surface. 47 48 This must be considered when choosing material because this kind of damage on the implant surface is irreparable.…”

Section: Discussionmentioning

confidence: 99%

Fatigue Resistance of Cast-on Implant Abutment Fabricated with Three Different Alloys

Didron

Puengpaiboon

2022

Eur J Dent

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Objectives This study aimed to evaluate fatigue resistance of cast-on implant abutment using three alloys. Materials and Methods Forty specimens of implant-supported crowns were prepared; Group 1 (TA) stock titanium abutments, Group 2 (GS) abutment cast with 40% gold alloy, Group 3 (GP) abutment cast with palladium alloy, and Group 4 (CN) abutment cast with nickel–chromium alloy. Specimens were cyclic loaded at 20 Hz, starting from 200 N (5,000 cycles), followed by stepwise loading of 400, 600, 800, 1,000, 1,200, 1,400, 1,600, and 1,800 N (30,000 cycles/step). Specimens were loaded until failure or reached 245,000 cycles. Statistical Analysis The withstand cycles were analyzed using one-way analysis of variance and Weibull survival analysis. Fracture surfaces were examined using scanning electron microscopy. Results The results of withstand cycles were TA (189,883 ± 22,734), GS (195,028 ± 22,371), GP (187,662 ± 22,555), and CN (200,350 ± 30,851). The statistical analysis showed no significant difference between the groups (p = 0.673). Conclusion Although CN has higher Weibull characteristic strength which means greater durability, its lower Weibull modulus demonstrated less structural reliability. Consistent failures at implant fixture level were also found in CN group.

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“…This result corroborates results by Ding results. [4][5][6][7][8][9][10][11][12][13][14] Regarding torque loss, two-way variance analysis showed no significant effect of the interaction between connection implant type and site of force application. 2018) disagree on the effect of the interaction between connection implant type and/or site of force application.…”

Section: Discussionmentioning

confidence: 99%

Screw removal torque evaluation in implants with cone morse and external hexagon platforms in anterior cantilever

Figueiredo

Francischone

Franco

et al. 2021

IAJMH

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This study aims to evaluate the screw removal torque on prosthetic platforms of Cone Morse (CM) and External Hexagon (EH) implants in crowns with anterior cantilever. Materials and Methods: in vitro study with a sample consisting of 20 test specimens of 2 elements (21 and 22), with n = 40; load is simulated on element 21 or on cantilever of 22. Samples were divided into 4 groups consisting of 10 test specimens on CM implants (groups 1 and 2), and 10 test specimens on EH implants (groups 3 and 4). The test specimens were manufactured using cylindrical PVC pipes measuring 22 x 19.05 mm filled with acrylic resin. The implants were fixed with a centralization device. Components used were EUCLAs and UCLAs with a chrome-cobalt alloy molten base. The metal bases were scanned, the crowns were digitally waxed, made on CAD/CAM system, and cemented on the metal bases with Panavia cement. Torque was applied using 20N for CM and 32N for EH, according to the manufacturers’ instructions. The test specimens were then subjected to a cycling process consisting of 1,000,000 cycles at a frequency of 2 Hz. The cyclic process applied axial forces to the surface (palate face of 21 and 22). Two cycling processes were carried on, the first on the palate face of 21 and the second on the palate face of 22. Between the two, screws were removed and replaced by new ones. The screw removal torque was measured using a digital torque meter. Results were analyzed with Student’s t test and variance analysis. Statistical calculations were conducted in SPSS 23 using 5% of significance. Results: Student’s t test showed significantly lower removal torque values in comparison with initial torque for both CM and EH connection implants and force applied to elements 21 and 22 (p < 0.001) or 22 (p < 0.001). Considering torque loss, there was no significant effect of the interaction between type of implant connection and site of force application (p = 0.094). Removal torque was significantly lower than initial torque for both implants (CM and EH). Conclusion: Torque loss occurred both in CM and EH. There was no significant effect of the interaction between connections and site of force application.

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Effect of Implant Platform Connection and Abutment Material on Removal Torque and Implant Hexagon Plastic Deformation

Cited by 9 publications

References 31 publications

Implant deformation and implant–abutment fracture resistance after standardized artificial aging: An in vitro study

Implant deformation and implant–abutment fracture resistance after standardized artificial aging: An in vitro study

Fatigue Resistance of Cast-on Implant Abutment Fabricated with Three Different Alloys

Screw removal torque evaluation in implants with cone morse and external hexagon platforms in anterior cantilever

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