Strain Gauge Analysis of the Effect of Porcelain Firing Simulation on the Prosthetic Misfit of Implant-Supported Frameworks

Vasconcellos, Diego Klee de; Özcan, Mutlu; Volpato, Cláudıa Ângela Mazıero; Bottino, Marco Antônio; Yener, Esra Salihoğlu

doi:10.1097/id.0b013e3182566e59

Cited by 12 publications

(19 citation statements)

References 20 publications

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“…15 In the present study, a polyurethane base was used because of its uniform elastic properties, being an isotropic material. 11,15 Moreover, its modulus of elasticity (20 GPa) is similar to that of human bone. 11,16 In vivo, human bone presents a more complex situation when bone remodeling occurs during the healing period, 12 but experimental models may help to grade the materials or systems that deliver more favorable results prior to clinical applications.…”

Section: Discussionmentioning

confidence: 82%

“…In that respect, the level of microstrains generated between the framework and implant are significant that is typically measured using strain gauges in simulated settings. 11 One thousand microstrains (1000 µε) was reported to correlate to a cell elongation of 0.1%. 12 Frost 13 distinguished a minimum effective strain of 500 µε needed for bone maintenance from the supra-physiological strain (>4000 µε)…”

Section: Introductionmentioning

confidence: 99%

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A microstrain comparison of passively fitting screw-retained and cemented titanium frameworks

Vasconcellos

Kojima

Mesquita

et al. 2014

The Journal of Prosthetic Dentistry

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STATEMENT OF PROBLEM An imprecise fit between frameworks and supporting dental implants in loaded protocols increases the strain transferred to the periimplant bone, which may impair healing or generate microgaps. PURPOSE The purpose of this study was to investigate the microstrain between premachined 1-piece screw-retained frameworks (group STF) and screw-retained frameworks fabricated by cementing titanium cylinders to the prefabricated framework (group CTF). This procedure was developed to correct the misfit between frameworks and loaded implants. MATERIAL AND METH-ODS Four internal hexagon cylindrical implants were placed 10 mm apart in a polyurethane block by using the surgical guides of the corresponding implant system. Previously fabricated titanium frameworks (n=10) were divided into 2 groups. In group STF, prefabricated machined frameworks were used (n=5), and, in group CTF, the frameworks were fabricated by using a passive fit procedure, which was developed to correct the misfit between the cast titanium frameworks and supporting dental implants (n=5). Both groups were screw-retained under torque control (10 Ncm). Six strain gauges were placed on the upper surface of the polyurethane block, and 3 strain measurements were recorded for each framework. Data were analyzed with the Student t test (=.05). RESULTS The mean microstrain values between the framework and the implants were significantly higher for group STF (2517 m) than for group CTF (844 m) (P<.05). CONCLUSIONS Complete-arch implant frameworks designed for load application and fabricated by using the passive fit procedure decreased the strain between the frameworks and implants more than 1 piece prefabricated machined frameworks. Precision of fit between frameworks and supporting dental implants in immediately loaded protocols reduces the strain transfered to the peri-implant bone that may impair healing or generate micro-gaps. Purpose. This study investigated the microstrain between premachined one-piece screw-retained frameworks (STF) and screw-retained frameworks constructed by the procedure of cementing titanium cylinders to the pre-fabricated framework (CTF), which has been developed for correction of misfit between framework and immediately loaded implants. Material and methods. Four internal hex cylindrical implants were placed 10 mm distant to each other in a polyurethane block, using surgical guides of the corresponding implant system. Previously fabricated titanium frameworks (N=10) were distributed into 2 groups. While in group STF, pre-fabricated machined frameworks were used (n=5), in group CTF, the frameworks were constructed by a passive fit procedure, which has been developed for correction of misfit between cast titanium frameworks and supporting dental implants (n=5).CTF system was cemented first in the final cast and then screw retained to the implants. Both groups were screw-retained under torque control (10 N/cm). Six strain gauges were placed on the upper surface of the polyurethane block and 3 strain measurements...

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Section: Discussionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

A microstrain comparison of passively fitting screw-retained and cemented titanium frameworks

Vasconcellos

Kojima

Mesquita

et al. 2014

The Journal of Prosthetic Dentistry

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“…13,14 An advantage of the present strain gauge study is the large number of samples per group (n = 10), increasing the reliabilit y of the data. Finite element analysis (FEA) could complement the present findings.…”

Section: Discussionmentioning

confidence: 99%

Strain analysis of different diameter Morse taper implants under overloading compressive conditions

et al. 2015

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The aim of this study was to evaluate the amount of deformation from compression caused by different diameters of Morse taper implants and the residual deformation after load removal. Thirty Morse taper implants lacking external threads were divided into 3 groups (n = 10) according to their diameter as follows: 3.5 mm, 4.0 mm and 5.0 mm. Two-piece abutments were fixed into the implants, and the samples were subjected to compressive axial loading up to 1500 N of force. During the test, one strain gauge remained fixed to the cervical portion of each implant to measure the strain variation. The strain values were recorded at two different time points: at the maximum load (1500 N) and 60 seconds after load removal. To calculate the strain at the implant/abutment interface, a mathematical formula was applied. Data were analyzed using a one-way Anova and Tukey's test (α = 0.05). The 5.0 mm diameter implant showed a significantly lower strain (650.5 μS ± 170.0) than the 4.0 mm group (1170.2 μS ± 374.7) and the 3.5 mm group (1388.1 μS ± 326.6) (p < 0.001), regardless of the load presence. The strain values decreased by approximately 50% after removal of the load, regardless of the implant diameter. The 5.0 mm implant showed a significantly lower strain at the implant/abutment interface (943.4 μS ± 504.5) than the 4.0 mm group (1057.4 μS ± 681.3) and the 3.5 mm group (1159.6 μS ± 425.9) (p < 0.001). According to the results of this study, the diameter influenced the strain around the internal and external walls of the cervical region of Morse taper implants; all diameters demonstrated clinically acceptable values of strain.

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“…In fact, mechanical stress may have both positive and negative consequences on the bone tissue (Abreu, Nishioka, Balducci, & Consani, ; Isidor, ). Although the response to an increased mechanical stress below a certain threshold may increase the bone density or apposition of bone (De Vasconcellos, Özcan, Maziero Volpato, Bottino, & Yener, ; Isidor, ; Watanabe, Uno, Hata, Neuendorff, & Kirsch, ), micro‐damage as a result of mechanical stress beyond the fatigue threshold results in bone resorption (De Vasconcellos et al, , Isidor, , Watanabe et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Complex strain fields around fixtures, implant components, or suprastructures could be typically measured using strain gauge analysis (Abduo, Bennani, Lyons, Waddell, & Swain, ; Abreu et al, ; Asvanund, ; Castro, Zancope, Verissimo, Soares, & Neves, ; Cehreli & Iplikcioglu, ; Cho et al, ; De Vasconcellos et al, ; De Vasconcellos, Nishioka, de Vasconcellos, Balducci, & Kojima, ; Heckmann et al, ; Hegde et al, ; Isidor, ; Karl, Rosch, Graef, Talyor, Heckmann, ; Karl, Graef, & Wichmann, ; Karl, Graef, Wichmann, & Krafft, ; Karl & Holst, ; Karl & Taylor, ; Karl, Wichmann, Heckmann, & Krafft, ; Nishioka, de Vasconcellos, & de Melo Nishioka, ; Nishioka, de Vasconcellos, Joias, & Rode Sde, ). With this method, an electrical resistance in the strain gauge enables the measurement of deformation with high sensitivity (μm/m) (Asvanund, ).…”

Section: Introductionmentioning

confidence: 99%

A strain gauge analysis comparing 4‐unit veneered zirconium dioxide implant‐borne fixed dental prosthesis on engaging and non‐engaging abutments before and after torque application

Epprecht

Zeltner

Benić

et al. 2018

Clinical & Exp Dental Res

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This study quantified the strain development after inserting implant‐borne fixed dental prosthesis (FDP) to various implant–abutment joints. Two bone‐level implants (∅ = 4.1 mm, RC, SLA 10 mm, Ti, Straumann) were inserted in polyurethane models (N = 3) in the area of tooth nos 44 and 47. Four‐unit veneered zirconium dioxide FDPs (n = 2) were fabricated, one of which was fixed on engaging (E; RC Variobase, ∅ = 4.5 mm, H = 3.5 mm) and the other on non‐engaging (NE) abutments (RC Variobase, ∅ = 4.5 mm, H = 5.5 mm). One strain gauge was bonded to the occlusal surface of pontic no. 46 on the FDP and the other two on the polyurethane model. Before (baseline) and after torque (35 Ncm), strain values were recorded three times. Data were analyzed using Kruskal–Wallis and Mann–Whitney U tests (α = 0.05). Mean strain values presented significant increase after torque for both E and NE implant–abutment connection type (baseline: E = 4.33 ± 4.38; NE = 4.85 ± 4.85; torque: E = 196.56 ± 188.02; NE = 275.63 ± 407.7; p < .05). Mean strain values based on implant level presented significant increase after torque for both E and NE implant–abutment connection (baseline: E = 4.94 ± 5.29; NE = 5.78 ± 5.69; torque: E = 253.78 ± 178.14; NE = 347.72 ± 493.06; p < .05). The position of the strain gauge on implants (p = .895), FDP (p = .275), and abutment connection type (p = .873) did not significantly affect the strain values. Strain levels for zirconium dioxide implant‐borne FDPs were not affected by the implant–abutment connection type.

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Strain Gauge Analysis of the Effect of Porcelain Firing Simulation on the Prosthetic Misfit of Implant-Supported Frameworks

Cited by 12 publications

References 20 publications

A microstrain comparison of passively fitting screw-retained and cemented titanium frameworks

A microstrain comparison of passively fitting screw-retained and cemented titanium frameworks

Strain analysis of different diameter Morse taper implants under overloading compressive conditions

A strain gauge analysis comparing 4‐unit veneered zirconium dioxide implant‐borne fixed dental prosthesis on engaging and non‐engaging abutments before and after torque application

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