In Vivo Stress Behavior in Cemented and Screw‐Retained Five‐Unit Implant FPDs
Identifieur interne : 006366 ( Istex/Curation ); précédent : 006365; suivant : 006367In Vivo Stress Behavior in Cemented and Screw‐Retained Five‐Unit Implant FPDs
Auteurs : Matthias Karl [Allemagne] ; Thomas D. Taylor ; Manfred G. Wichmann [Allemagne] ; Siegfried M. Heckmann [Allemagne]Source :
- Journal of Prosthodontics [ 1059-941X ] ; 2006-01.
English descriptors
- KwdEn :
- Abutment, American college, Basic impression, Bridge fabrication, Bridge pontics, Cast bridge frames, Cement retention, Certain degree, Conventional bridges, Dent, Fpd, Gold cylinder, Gold cylinders, Heraeus kulzer, Hottinger baldwin messtechnik gmbh, Implant, Implant prosthodontics, Implant restorations, Lower strain levels, Master model, Maxillofac, Measurement protocol, Nite element analysis, Objective accuracy test, Occlusal screw, Occlusal screws, Oral cavity, Oral maxillofac implants, Partial dentures, Patient consent, Pickup technique impression, Prosthesis, Prosthet dent, Prosthodontics, Repositioning technique impression, Screw retention, Solid abutments, Solid screw implants, Standard deviations, Strain development, Strain gauge, Strain values, Superstructure, Synocta abutments, Technique impression, Vivo stress behavior, Vivo study.
- Teeft :
- Abutment, American college, Basic impression, Bridge fabrication, Bridge pontics, Cast bridge frames, Cement retention, Certain degree, Conventional bridges, Dent, Fpd, Gold cylinder, Gold cylinders, Heraeus kulzer, Hottinger baldwin messtechnik gmbh, Implant, Implant prosthodontics, Implant restorations, Lower strain levels, Master model, Maxillofac, Measurement protocol, Nite element analysis, Objective accuracy test, Occlusal screw, Occlusal screws, Oral cavity, Oral maxillofac implants, Partial dentures, Patient consent, Pickup technique impression, Prosthesis, Prosthet dent, Prosthodontics, Repositioning technique impression, Screw retention, Solid abutments, Solid screw implants, Standard deviations, Strain development, Strain gauge, Strain values, Superstructure, Synocta abutments, Technique impression, Vivo stress behavior, Vivo study.
Abstract
Purpose: When fixing implant‐supported fixed partial dentures (FPDs), it is important to achieve passive fit. The objective of the in vivo study presented was to quantify the strain development during the fixation of screw‐ and cement‐retained FPDs. Materials and Methods: After informed patient consent had been obtained (Ethics commission Approval No. 2315; FAU Erlangen‐Nuremberg, Germany), four groups of five‐unit FPDs (five samples per group) were fabricated and investigated in vivo. Group 1: Cementable, repositioning technique impression, burn out plastic coping; Group 2: Screwable, pickup technique impression, burn out plastic coping; Group 3: Screwable, pickup technique impression, cast to gold cylinder; Group 4: Screwable, pickup technique impression, bonded to gold cylinder. Two strain gauges (SG) were attached to the pontics of each bridge (SG‐M and SG‐D) to measure the strains that occurred during either the cementing or screw‐in process. The final values were recorded for analysis. Results: The mean strain values (μm/m) for each SG were: Group 1: SG‐M 32 μm/m, SG‐D: 89 μm/m; Group 2: SG‐M 302 μm/m, SG‐D: 197 μm/m; Group 3: SG‐M 458 μm/m, SG‐D: 268 μm/m; Group 4: SG‐M 269 μm/m, SG‐D: 52 μm/m. Conclusions: Although the bridges were clinically acceptable, none of them revealed a truly passive fit with zero microstrain. In contrast to conventional screw‐retained bridges, cement retention seems to result in lower strain levels. Bonding bridge pontics to prefabricated implant components seems to allow both the retrievability of a screw‐retained bridge and produce moderate strain values.
Url:
DOI: 10.1111/j.1532-849X.2006.00064.x
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Thomas D. Taylor<affiliation><mods:affiliation>Department of Prosthodontics, University of Connecticut, Farmington.</mods:affiliation>
<wicri:noCountry code="subField">Farmington.</wicri:noCountry>
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<term>Repositioning technique impression</term>
<term>Screw retention</term>
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<term>Strain development</term>
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<term>Gold cylinders</term>
<term>Heraeus kulzer</term>
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<term>Implant prosthodontics</term>
<term>Implant restorations</term>
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<term>Master model</term>
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<term>Oral maxillofac implants</term>
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<term>Patient consent</term>
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<front><div type="abstract" xml:lang="en">Purpose: When fixing implant‐supported fixed partial dentures (FPDs), it is important to achieve passive fit. The objective of the in vivo study presented was to quantify the strain development during the fixation of screw‐ and cement‐retained FPDs. Materials and Methods: After informed patient consent had been obtained (Ethics commission Approval No. 2315; FAU Erlangen‐Nuremberg, Germany), four groups of five‐unit FPDs (five samples per group) were fabricated and investigated in vivo. Group 1: Cementable, repositioning technique impression, burn out plastic coping; Group 2: Screwable, pickup technique impression, burn out plastic coping; Group 3: Screwable, pickup technique impression, cast to gold cylinder; Group 4: Screwable, pickup technique impression, bonded to gold cylinder. Two strain gauges (SG) were attached to the pontics of each bridge (SG‐M and SG‐D) to measure the strains that occurred during either the cementing or screw‐in process. The final values were recorded for analysis. Results: The mean strain values (μm/m) for each SG were: Group 1: SG‐M 32 μm/m, SG‐D: 89 μm/m; Group 2: SG‐M 302 μm/m, SG‐D: 197 μm/m; Group 3: SG‐M 458 μm/m, SG‐D: 268 μm/m; Group 4: SG‐M 269 μm/m, SG‐D: 52 μm/m. Conclusions: Although the bridges were clinically acceptable, none of them revealed a truly passive fit with zero microstrain. In contrast to conventional screw‐retained bridges, cement retention seems to result in lower strain levels. Bonding bridge pontics to prefabricated implant components seems to allow both the retrievability of a screw‐retained bridge and produce moderate strain values.</div>
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