Effect of Dental Implant Diameter on Fatigue Performance. Part II: Failure Analysis

Purpose The purpose of this study was to perform fracture mode analysis for in vitro failed implants in order to evaluate the relation between the fracture mode obtained and the implants’ fatigue behavior. Materials and Methods Eighty fractured dental implants were analyzed after being tested for fa...

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Published in:Clinical implant dentistry and related research Vol. 16; no. 2; pp. 178 - 184
Main Authors: Shemtov-Yona, Keren, Rittel, Daniel, Machtei, Eli E., Levin, Liran
Format: Journal Article
Language:English
Published: United States Blackwell Publishing Ltd 01.04.2014
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ISSN:1523-0899, 1708-8208, 1708-8208
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Abstract Purpose The purpose of this study was to perform fracture mode analysis for in vitro failed implants in order to evaluate the relation between the fracture mode obtained and the implants’ fatigue behavior. Materials and Methods Eighty fractured dental implants were analyzed after being tested for fatigue performance. A macroscopic failure analysis was performed, which evaluated and located the fracture modes obtained, followed by a microscopic failure analysis comprising a detailed scanning electron microscopy (SEM) fractographic analysis. Results Four distinctive fracture loci were identified and macrofracture mode analysis was performed, showing that all 5‐mm implants that fractured were fractured at the abutment neck and screw. In the 3.75‐mm group, 44.4% were fractured at the implant neck and 55.5% at the implants second thread. Fifty‐two percent of the 3.3‐mm fractured implants had it at the implants second tread and 48% at the implants third thread. The implant's metallographic sections revealed that the different fracture loci were located where thin metal cross sections and sharp notches coexist. Using SEM, we were able to characterize the failure micromechanisms and fatigue characterization as transgranular fracture and arrays of secondary parallel microcracks at relatively low magnifications and classic fatigue striations at much higher magnifications. Conclusions The results of this study indicate that proper implant design is crucial to ensure long‐term fatigue performance for dental implants. The combination of sharp notches (thread) and narrow metal cross section is quite deleterious for fatigue resistance.
AbstractList Purpose The purpose of this study was to perform fracture mode analysis for in vitro failed implants in order to evaluate the relation between the fracture mode obtained and the implants’ fatigue behavior. Materials and Methods Eighty fractured dental implants were analyzed after being tested for fatigue performance. A macroscopic failure analysis was performed, which evaluated and located the fracture modes obtained, followed by a microscopic failure analysis comprising a detailed scanning electron microscopy (SEM) fractographic analysis. Results Four distinctive fracture loci were identified and macrofracture mode analysis was performed, showing that all 5‐mm implants that fractured were fractured at the abutment neck and screw. In the 3.75‐mm group, 44.4% were fractured at the implant neck and 55.5% at the implants second thread. Fifty‐two percent of the 3.3‐mm fractured implants had it at the implants second tread and 48% at the implants third thread. The implant's metallographic sections revealed that the different fracture loci were located where thin metal cross sections and sharp notches coexist. Using SEM, we were able to characterize the failure micromechanisms and fatigue characterization as transgranular fracture and arrays of secondary parallel microcracks at relatively low magnifications and classic fatigue striations at much higher magnifications. Conclusions The results of this study indicate that proper implant design is crucial to ensure long‐term fatigue performance for dental implants. The combination of sharp notches (thread) and narrow metal cross section is quite deleterious for fatigue resistance.
The purpose of this study was to perform fracture mode analysis for in vitro failed implants in order to evaluate the relation between the fracture mode obtained and the implants' fatigue behavior.PURPOSEThe purpose of this study was to perform fracture mode analysis for in vitro failed implants in order to evaluate the relation between the fracture mode obtained and the implants' fatigue behavior.Eighty fractured dental implants were analyzed after being tested for fatigue performance. A macroscopic failure analysis was performed, which evaluated and located the fracture modes obtained, followed by a microscopic failure analysis comprising a detailed scanning electron microscopy (SEM) fractographic analysis.MATERIALS AND METHODSEighty fractured dental implants were analyzed after being tested for fatigue performance. A macroscopic failure analysis was performed, which evaluated and located the fracture modes obtained, followed by a microscopic failure analysis comprising a detailed scanning electron microscopy (SEM) fractographic analysis.Four distinctive fracture loci were identified and macrofracture mode analysis was performed, showing that all 5-mm implants that fractured were fractured at the abutment neck and screw. In the 3.75-mm group, 44.4% were fractured at the implant neck and 55.5% at the implants second thread. Fifty-two percent of the 3.3-mm fractured implants had it at the implants second tread and 48% at the implants third thread. The implant's metallographic sections revealed that the different fracture loci were located where thin metal cross sections and sharp notches coexist. Using SEM, we were able to characterize the failure micromechanisms and fatigue characterization as transgranular fracture and arrays of secondary parallel microcracks at relatively low magnifications and classic fatigue striations at much higher magnifications.RESULTSFour distinctive fracture loci were identified and macrofracture mode analysis was performed, showing that all 5-mm implants that fractured were fractured at the abutment neck and screw. In the 3.75-mm group, 44.4% were fractured at the implant neck and 55.5% at the implants second thread. Fifty-two percent of the 3.3-mm fractured implants had it at the implants second tread and 48% at the implants third thread. The implant's metallographic sections revealed that the different fracture loci were located where thin metal cross sections and sharp notches coexist. Using SEM, we were able to characterize the failure micromechanisms and fatigue characterization as transgranular fracture and arrays of secondary parallel microcracks at relatively low magnifications and classic fatigue striations at much higher magnifications.The results of this study indicate that proper implant design is crucial to ensure long-term fatigue performance for dental implants. The combination of sharp notches (thread) and narrow metal cross section is quite deleterious for fatigue resistance.CONCLUSIONSThe results of this study indicate that proper implant design is crucial to ensure long-term fatigue performance for dental implants. The combination of sharp notches (thread) and narrow metal cross section is quite deleterious for fatigue resistance.
The purpose of this study was to perform fracture mode analysis for in vitro failed implants in order to evaluate the relation between the fracture mode obtained and the implants' fatigue behavior. Eighty fractured dental implants were analyzed after being tested for fatigue performance. A macroscopic failure analysis was performed, which evaluated and located the fracture modes obtained, followed by a microscopic failure analysis comprising a detailed scanning electron microscopy (SEM) fractographic analysis. Four distinctive fracture loci were identified and macrofracture mode analysis was performed, showing that all 5-mm implants that fractured were fractured at the abutment neck and screw. In the 3.75-mm group, 44.4% were fractured at the implant neck and 55.5% at the implants second thread. Fifty-two percent of the 3.3-mm fractured implants had it at the implants second tread and 48% at the implants third thread. The implant's metallographic sections revealed that the different fracture loci were located where thin metal cross sections and sharp notches coexist. Using SEM, we were able to characterize the failure micromechanisms and fatigue characterization as transgranular fracture and arrays of secondary parallel microcracks at relatively low magnifications and classic fatigue striations at much higher magnifications. The results of this study indicate that proper implant design is crucial to ensure long-term fatigue performance for dental implants. The combination of sharp notches (thread) and narrow metal cross section is quite deleterious for fatigue resistance.
The purpose of this study was to perform fracture mode analysis for in vitro failed implants in order to evaluate the relation between the fracture mode obtained and the implants' fatigue behavior. Eighty fractured dental implants were analyzed after being tested for fatigue performance. A macroscopic failure analysis was performed, which evaluated and located the fracture modes obtained, followed by a microscopic failure analysis comprising a detailed scanning electron microscopy (SEM) fractographic analysis. Four distinctive fracture loci were identified and macrofracture mode analysis was performed, showing that all 5-mm implants that fractured were fractured at the abutment neck and screw. In the 3.75-mm group, 44.4% were fractured at the implant neck and 55.5% at the implants second thread. Fifty-two percent of the 3.3-mm fractured implants had it at the implants second tread and 48% at the implants third thread. The implant's metallographic sections revealed that the different fracture loci were located where thin metal cross sections and sharp notches coexist. Using SEM, we were able to characterize the failure micromechanisms and fatigue characterization as transgranular fracture and arrays of secondary parallel microcracks at relatively low magnifications and classic fatigue striations at much higher magnifications. The results of this study indicate that proper implant design is crucial to ensure long-term fatigue performance for dental implants. The combination of sharp notches (thread) and narrow metal cross section is quite deleterious for fatigue resistance.
Author Machtei, Eli E.
Shemtov-Yona, Keren
Rittel, Daniel
Levin, Liran
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Keywords scanning electron microscopy
stress concentration
striation
implant design
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2014; 16
2011; 38
2010; 30
1997; 8
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References_xml – reference: Sbordone L, Traini T, Caputi S, Scarano A, Bortolaia C, Piattelli A. Scanning electron microscopy fractography analysis of fractured hollow implants. J Oral Implantol 2010; 36:105-111.
– reference: Steinebrunner L, Wolfart S, Ludwig K, Kern M. Implant-abutment interface design affects fatigue and fracture strength of implants. Clin Oral Implants Res 2008; 19:1276-1284.
– reference: Shemtov-Yona K, Rittel D, Levin L, Machtei E. Effect of dental implant diameter on fatigue performance. Part I: mechanical behavior. Clin Implant Dent Relat Res 2014; 16:172-177.
– reference: Norton MR. An in vitro evaluation of the strength of an internal conical interface compared to a butt joint interface in implant design. Clin Oral Implants Res 1997; 8:290-298.
– reference: Khraisat A, Stegaroiu R, Nomura S, Miyakawa O. Fatigue resistance of two implant/abutment joint designs. J Prosthet Dent 2002; 88:604-610.
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– reference: Pjetursson BE, Tan K, Lang NP, Brägger U, Egger M, Zwahlen M. A systematic review of the survival and complication rates of fixed partial dentures (FPDs) after an observation period of at least 5 years. Clin Oral Implants Res 2004; 15:667-676.
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  publication-title: J Oral Implantol
– volume: 8
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– volume: 36
  start-page: 105
  year: 2010
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  article-title: Scanning electron microscopy fractography analysis of fractured hollow implants
  publication-title: J Oral Implantol
– volume: 16
  start-page: 172
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  publication-title: Clin Implant Dent Relat Res
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  start-page: 1294
  year: 2010
  end-page: 1300
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  publication-title: Clin Oral Implants Res
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  start-page: 327
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  publication-title: Int J Oral Maxillofac Implants
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  start-page: 1276
  year: 2008
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  publication-title: Clin Oral Implants Res
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  article-title: An in vitro evaluation of the strength of an internal conical interface compared to a butt joint interface in implant design
  publication-title: Clin Oral Implants Res
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SubjectTerms Dental Implants
implant design
Materials Testing
Microscopy, Electron, Scanning
scanning electron microscopy
stress concentration
striation
Titanium
Title Effect of Dental Implant Diameter on Fatigue Performance. Part II: Failure Analysis
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