Stress Distribution after Installation of Fixed Frameworks with Marginal Gaps over Angled and Parallel Implants: A Photoelastic Analysis
Purpose: The objective of this work was to compare by photoelastic analysis the stress distribution along a fixed framework placed over angled or parallel implants with different gap values between the framework and one of the implants. Materials and Methods: Two photoelastic models were created: (i...
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| Published in: | Journal of prosthodontics Vol. 16; no. 2; pp. 117 - 122 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
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Blackwell Publishing Inc
01-03-2007
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| Abstract | Purpose: The objective of this work was to compare by photoelastic analysis the stress distribution along a fixed framework placed over angled or parallel implants with different gap values between the framework and one of the implants.
Materials and Methods: Two photoelastic models were created: (i) with parallel implants; (ii) with a 30° angled central implant. In both cases, three implants were used, and CP titanium frameworks were constructed with commercial components. A plane polariscope was used to observe the photoelastic fringes generated after initial framework assembly, and also when an axial load of 100 N was applied over the central implant. For both models, stress analysis was conducted on well‐fitting frameworks and on another with a 150 μm vertical gap between the framework and the central implant.
Results: The photoelastic analysis indicated that in the model with parallel implants, stress distribution followed the implant axis, and in the model with an angled implant, a higher and nonhomogeneous stress concentration was observed around the apical region of the lateral implants. The placement of an ill‐fitting framework resulted in increased preload stress patterns.
Conclusion: Stresses were generated after screw tightening of the frameworks, increasing when a load was applied and when a vertical gap was present. Angled implants resulted in oblique stress patterns, which were not transferred with homogeneity to the polymeric model. |
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| AbstractList | Purpose
:
The objective of this work was to compare by photoelastic analysis the stress distribution along a fixed framework placed over angled or parallel implants with different gap values between the framework and one of the implants.
Materials and Methods
:
Two photoelastic models were created: (i) with parallel implants; (ii) with a 30° angled central implant. In both cases, three implants were used, and CP titanium frameworks were constructed with commercial components. A plane polariscope was used to observe the photoelastic fringes generated after initial framework assembly, and also when an axial load of 100 N was applied over the central implant. For both models, stress analysis was conducted on well‐fitting frameworks and on another with a 150 μm vertical gap between the framework and the central implant.
Results
:
The photoelastic analysis indicated that in the model with parallel implants, stress distribution followed the implant axis, and in the model with an angled implant, a higher and nonhomogeneous stress concentration was observed around the apical region of the lateral implants. The placement of an ill‐fitting framework resulted in increased preload stress patterns.
Conclusion
:
Stresses were generated after screw tightening of the frameworks, increasing when a load was applied and when a vertical gap was present. Angled implants resulted in oblique stress patterns, which were not transferred with homogeneity to the polymeric model. PURPOSEThe objective of this work was to compare by photoelastic analysis the stress distribution along a fixed framework placed over angled or parallel implants with different gap values between the framework and one of the implants.MATERIALS AND METHODSTwo photoelastic models were created: (i) with parallel implants; (ii) with a 30 degrees angled central implant. In both cases, three implants were used, and CP titanium frameworks were constructed with commercial components. A plane polariscope was used to observe the photoelastic fringes generated after initial framework assembly, and also when an axial load of 100 N was applied over the central implant. For both models, stress analysis was conducted on well-fitting frameworks and on another with a 150 microm vertical gap between the framework and the central implant.RESULTSThe photoelastic analysis indicated that in the model with parallel implants, stress distribution followed the implant axis, and in the model with an angled implant, a higher and nonhomogeneous stress concentration was observed around the apical region of the lateral implants. The placement of an ill-fitting framework resulted in increased preload stress patterns.CONCLUSIONStresses were generated after screw tightening of the frameworks, increasing when a load was applied and when a vertical gap was present. Angled implants resulted in oblique stress patterns, which were not transferred with homogeneity to the polymeric model. Purpose: The objective of this work was to compare by photoelastic analysis the stress distribution along a fixed framework placed over angled or parallel implants with different gap values between the framework and one of the implants. Materials and Methods: Two photoelastic models were created: (i) with parallel implants; (ii) with a 30° angled central implant. In both cases, three implants were used, and CP titanium frameworks were constructed with commercial components. A plane polariscope was used to observe the photoelastic fringes generated after initial framework assembly, and also when an axial load of 100 N was applied over the central implant. For both models, stress analysis was conducted on well‐fitting frameworks and on another with a 150 μm vertical gap between the framework and the central implant. Results: The photoelastic analysis indicated that in the model with parallel implants, stress distribution followed the implant axis, and in the model with an angled implant, a higher and nonhomogeneous stress concentration was observed around the apical region of the lateral implants. The placement of an ill‐fitting framework resulted in increased preload stress patterns. Conclusion: Stresses were generated after screw tightening of the frameworks, increasing when a load was applied and when a vertical gap was present. Angled implants resulted in oblique stress patterns, which were not transferred with homogeneity to the polymeric model. The objective of this work was to compare by photoelastic analysis the stress distribution along a fixed framework placed over angled or parallel implants with different gap values between the framework and one of the implants. Two photoelastic models were created: (i) with parallel implants; (ii) with a 30 degrees angled central implant. In both cases, three implants were used, and CP titanium frameworks were constructed with commercial components. A plane polariscope was used to observe the photoelastic fringes generated after initial framework assembly, and also when an axial load of 100 N was applied over the central implant. For both models, stress analysis was conducted on well-fitting frameworks and on another with a 150 microm vertical gap between the framework and the central implant. The photoelastic analysis indicated that in the model with parallel implants, stress distribution followed the implant axis, and in the model with an angled implant, a higher and nonhomogeneous stress concentration was observed around the apical region of the lateral implants. The placement of an ill-fitting framework resulted in increased preload stress patterns. Stresses were generated after screw tightening of the frameworks, increasing when a load was applied and when a vertical gap was present. Angled implants resulted in oblique stress patterns, which were not transferred with homogeneity to the polymeric model. |
| Author | Sendyk, Claudio Luiz Souza, Roberto Martins Markarian, Roberto Adrian Laganá, Dalva Cruz Ueda, Cristiane |
| Author_xml | – sequence: 1 givenname: Roberto Adrian surname: Markarian fullname: Markarian, Roberto Adrian organization: MSc Program, Department of Prosthodontics, University of São Paulo School of Dentistry, Brazil – sequence: 2 givenname: Cristiane surname: Ueda fullname: Ueda, Cristiane organization: MSc Program, Department of Prosthodontics, University of São Paulo School of Dentistry, Brazil – sequence: 3 givenname: Claudio Luiz surname: Sendyk fullname: Sendyk, Claudio Luiz organization: Professor, Department of Prosthodontics, University of São Paulo School of Dentistry, Brazil – sequence: 4 givenname: Dalva Cruz surname: Laganá fullname: Laganá, Dalva Cruz organization: Professor, Department of Prosthodontics, University of São Paulo School of Dentistry, Brazil – sequence: 5 givenname: Roberto Martins surname: Souza fullname: Souza, Roberto Martins organization: Professor, Department of Mechanical Engineering, Polytechnic School of the University of São Paulo, Brazil |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/17362421$$D View this record in MEDLINE/PubMed |
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| Cites_doi | 10.1034/j.1600-0501.1998.090408.x 10.1016/S0022-3913(99)70109-5 10.1097/00008505-200009030-00006 10.1016/S0022-3913(98)70246-X 10.1016/S0021-9290(00)00089-0 10.1067/mpr.2002.127401 |
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| References_xml | – volume: 15 start-page: 722 year: 2000 end-page: 730 article-title: Placement of posterior mandibular and maxillary implants in patients with severe bone defiency: a clinical report of procedure publication-title: Int J Oral Maxillofac Implants – volume: 4 start-page: 241 year: 1989 end-page: 247 article-title: Forces and moments on Brånemark implants publication-title: Int J Oral Maxillofac Implants – volume: 6 start-page: 270 year: 1991 end-page: 276 article-title: Failures and complications in 391 consecutively inserted fixed prostheses supported by Branemark implants in edentulous jaws: a study of treatment from the time of prosthesis placement to the first annual checkup publication-title: Int J Oral Maxillofac Implants – volume: 88 start-page: 192 year: 2002 end-page: 199 article-title: Transmission of bone strain in the craniofacial bones of edentulous human skulls upon dental implant loading publication-title: J Prosthet Dent – volume: 18 start-page: 264 year: 1992 end-page: 274 article-title: Force transfer in implant dentistry: basic concepts and principles publication-title: J Oral Implantol – volume: 81 start-page: 696 year: 1999 end-page: 703 article-title: Photoelastic stress analysis of load transfer to implants and natural teeth comparing rigid and semirigid connectors publication-title: J Prosthet Dent – volume: 9 start-page: 272 year: 1998 end-page: 280 article-title: Measurements of bone and frame‐work deformations induced by misfit of implant superstructures: a pilot study in rabbits publication-title: Clin Oral Implants Res – volume: 8 start-page: 511 year: 1995 end-page: 516 article-title: Inaccurate fit of implant superstructures. Part 1: stresses generated on the superstructure relative to the size of fit discrepancy publication-title: Int J Prosthodont – start-page: 19 year: 1987 end-page: 27 – volume: 33 start-page: 1489 year: 2000 end-page: 1495 article-title: Experimental and computational approach for the evaluation of the biomechanical effects of dental bridge misfit publication-title: J Biomech – volume: 15 start-page: 239 year: 2000 end-page: 246 article-title: Passivity of fit and marginal opening in screw‐ or cement‐retained implant fixed partial denture designs publication-title: Int J Oral Maxillofac Implants – volume: 27 start-page: 591 year: 1996 end-page: 598 article-title: Comparison of stress distribution around vertical and angled implants with finite‐element analysis publication-title: Quintessence Int – volume: 9 start-page: 207 year: 2000 end-page: 216 article-title: Stress distribution in the single‐unit osseointegrated dental implant: finite element analyses of axial and off‐axial loading publication-title: Implant Dent – volume: 9 start-page: 221 year: 1989 end-page: 230 article-title: Comparison of peri‐implant stresses transmitted by four commercially available osseointegrated implants publication-title: Int J Periodontics Restorative Dent – start-page: 233 year: 1985 end-page: 240 – volume: 79 start-page: 328 year: 1998 end-page: 334 article-title: The influence of abutment angulation on strains and stresses along the implant/bone interface: comparison between two experimental techniques publication-title: J Prosthet Dent – volume: 9 start-page: 48 issue: Suppl year: 1994 end-page: 63 article-title: The role of screws in implant systems publication-title: Int J Oral Maxillofac Implants – volume: 6 start-page: 270 year: 1991 ident: e_1_2_7_18_2 article-title: Failures and complications in 391 consecutively inserted fixed prostheses supported by Branemark implants in edentulous jaws: a study of treatment from the time of prosthesis placement to the first annual checkup publication-title: Int J Oral Maxillofac Implants contributor: fullname: Jemt T – ident: e_1_2_7_5_2 doi: 10.1034/j.1600-0501.1998.090408.x – ident: e_1_2_7_16_2 doi: 10.1016/S0022-3913(99)70109-5 – volume: 15 start-page: 239 year: 2000 ident: e_1_2_7_6_2 article-title: Passivity of fit and marginal opening in screw‐ or cement‐retained implant fixed partial denture designs publication-title: Int J Oral Maxillofac Implants contributor: fullname: Guichet DL – start-page: 233 volume-title: Tissue‐Integrated Prostheses: Osseointegration in Clinical Dentistry year: 1985 ident: e_1_2_7_8_2 contributor: fullname: Lekholm U – volume: 8 start-page: 511 year: 1995 ident: e_1_2_7_3_2 article-title: Inaccurate fit of implant superstructures. Part 1: stresses generated on the superstructure relative to the size of fit discrepancy publication-title: Int J Prosthodont contributor: fullname: Millington ND – ident: e_1_2_7_9_2 doi: 10.1097/00008505-200009030-00006 – volume: 9 start-page: 221 year: 1989 ident: e_1_2_7_17_2 article-title: Comparison of peri‐implant stresses transmitted by four commercially available osseointegrated implants publication-title: Int J Periodontics Restorative Dent contributor: fullname: French AA – ident: e_1_2_7_11_2 doi: 10.1016/S0022-3913(98)70246-X – ident: e_1_2_7_2_2 doi: 10.1016/S0021-9290(00)00089-0 – ident: e_1_2_7_15_2 doi: 10.1067/mpr.2002.127401 – volume: 27 start-page: 591 year: 1996 ident: e_1_2_7_13_2 article-title: Comparison of stress distribution around vertical and angled implants with finite‐element analysis publication-title: Quintessence Int contributor: fullname: Canay S – volume: 15 start-page: 722 year: 2000 ident: e_1_2_7_10_2 article-title: Placement of posterior mandibular and maxillary implants in patients with severe bone defiency: a clinical report of procedure publication-title: Int J Oral Maxillofac Implants contributor: fullname: Krekmanov L – volume: 9 start-page: 48 year: 1994 ident: e_1_2_7_4_2 article-title: The role of screws in implant systems publication-title: Int J Oral Maxillofac Implants contributor: fullname: Binon P – volume: 18 start-page: 264 year: 1992 ident: e_1_2_7_7_2 article-title: Force transfer in implant dentistry: basic concepts and principles publication-title: J Oral Implantol contributor: fullname: Bidez MW – volume: 4 start-page: 241 year: 1989 ident: e_1_2_7_12_2 article-title: Forces and moments on Brånemark implants publication-title: Int J Oral Maxillofac Implants contributor: fullname: Rangert B – start-page: 19 volume-title: Biomechanics in Clinical Dentistry year: 1987 ident: e_1_2_7_14_2 contributor: fullname: Caputo AA |
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| Snippet | Purpose: The objective of this work was to compare by photoelastic analysis the stress distribution along a fixed framework placed over angled or parallel... The objective of this work was to compare by photoelastic analysis the stress distribution along a fixed framework placed over angled or parallel implants with... Purpose : The objective of this work was to compare by photoelastic analysis the stress distribution along a fixed framework placed over angled or parallel... PURPOSEThe objective of this work was to compare by photoelastic analysis the stress distribution along a fixed framework placed over angled or parallel... |
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| SubjectTerms | Compressive Strength dental implant Dental Implants Dental Prosthesis, Implant-Supported - methods Dental Stress Analysis Dentistry Elasticity fixed prosthesis framework implant-supported prosthesis photoelasticity |
| Title | Stress Distribution after Installation of Fixed Frameworks with Marginal Gaps over Angled and Parallel Implants: A Photoelastic Analysis |
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