In Vivo Stress Behavior in Cemented and Screw‐Retained Five‐Unit Implant FPDs

Karl, Matthias; Taylor, Thomas D.; Wichmann, Manfred; Heckmann, Siegfried M.

doi:10.1111/j.1532-849x.2006.00064.x

Cited by 48 publications

(67 citation statements)

References 11 publications

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“…Cast frameworks may suffer distortion, marginal misfit, and/or airentrapment, thus enhancing the effects of mechanical fatigue (2,3). Interactions of such factors might lead to catastrophic failures, either under repeated loading, or after stress concentrations exceeding the ultimate strength of the materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of alloy type and casting technique on the fracture strength of implant-cemented structures

Oyague¹,

Osorio²,

Lynch³

et al. 2011

Med Oral

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Objectives: To evaluate the influence of alloy type and casting procedure on the fracture strength (FS) of metallic frameworks for implant-supported fixed prostheses. Study design: Thirty three-unit structures for lower posterior bridges were waxed-up and randomly assigned to two groups (n=15) according to alloy type and casting technique: Group 1 (C): cobalt-chromium cast in a centrifugal machine (TS1, Degussa-Hüls); Group 2 (T): titanium cast in a pressure-differential device (Cyclarc II, Morita). Each structure was cemented onto two prefabricated abutments under a constant seating pressure. After 6 months of water aging, samples were loaded in a static universal testing machine (EFH/5/FR, Microtest) until fracture. Axial compressive loads were applied at the central fossa of the pontics. FS data were recorded and surface topography of the fractured connectors was SEM-analyzed. A Chi-Square test was performed to assess the dependence of pores on the alloy type and casting procedure. ANOVA and Student-Newman-Keuls (SNK) tests were run for FS comparisons (p<0.05). Results: One third of the C structures showed pores inside the fractured connectors. T frameworks demonstrated higher FS than that of C specimens exhibiting pores (p=0.025). C samples containing no pores recorded the greatest mean FS (p<0.001). Conclusions: Fracture strength of metallic frameworks depended on the alloy type and casting procedure. Cobaltchromium casts often registered pores inside the connectors, which strongly decreased the fracture resistance. An accurate casting of titanium with a pressure-differential system may result in the most predictable technique under the tested experimental conditions.

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Section: Introductionmentioning

confidence: 99%

Effect of alloy type and casting technique on the fracture strength of implant-cemented structures

Oyague¹,

Osorio²,

Lynch³

et al. 2011

Med Oral

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“…[4][5][6] The stress generated by the absence of passive fit for implant supported fixed dental prostheses (FDP) does not dissipate over time due to the ankylotic nature of osseointegration, which may lead to mechanical and/or biologic complications, confirming the need for prosthetic precision to ensure longterm success. [7][8][9] Impression materials and techniques are fundamental in the precision of fit and passivity of implant supported FDPs. 8,10,11 It is imperative for the impression to accurately register and transfer to the master cast the three-dimensional position of the osseointegrated implants.…”

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confidence: 99%

Accuracy of Definitive Casts Using 4 Implant-Level Impression Techniques in a Scenario of Multi-Implant System With Different Implant Angulations and Subgingival Alignment Levels

et al. 2013

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PURPOSE: To evaluate the effect of various implant-level impression techniques on the accuracy of definitive casts for a multiple internal connection implant system with different implant angulations and subgingival depths. MATERIAL AND METHODS: Six tapered Screw-Vent implants were placed in a reference model with different angles (0, 15, and 30 degrees) and subgingival positions (0, 1, and 3 mm). Twenty medium-consistency polyether impressions of this model were made with 4 techniques (n = 5 per group): (1) indirect technique, (2) unsplinted direct technique, (3) acrylic resin-splinted direct technique, and (4) metal-splinted direct technique. Impressions were poured with type IV dental stone. The interimplant distances were measured for casts using a coordinate measuring machine and the deviations compared with the reference model were calculated. Data were analyzed using intraclass correlation coefficient, ANOVA and Bonferroni test ( = 0.05). RESULTS: Four impression procedures showed significant differences (P = 0.0001). Only group 4 casts showed no significant differences in comparison with the reference model (P = 0.666) (ANOVA repeated measures). CONCLUSIONS: The impression procedure affected the accuracy of definitive casts. The metal-splinted direct technique produced the most accurate casts, followed by acrylic resin-splinted direct, indirect, and unsplinted direct techniques. ABSTRACT (199 words)Purpose To evaluate the effect of four implant-level impression techniques on the accuracy of

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“…This is in disagreement with findings reported in the literature that state that discrepancies in the fit between a prosthesis and abutment can be overcome by the use of a bonding agent, thereby conferring greater stability to the set of components (17). It should be stressed that the abovementioned studies are laboratory studies (13,18) and bonding in such cases is performed under ideal, pre-established conditions.…”

Section: Discussionmentioning

confidence: 72%