Fatigue resistance of two implant/abutment joint designs

Khraisat, Ameen; Stegaroiu, Roxana; Nomura, Sadahiro; Miyakawa, Osamu

doi:10.1067/mpr.2002.129384

Cited by 179 publications

(199 citation statements)

References 8 publications

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“…Concerning the geometry of implant connection (internal vs. external), higher reliability was observed in specimens with internal connection regardless of the abutment diameter. These findings are in agreement with other studies that pointed that deep joints show increased stability favoring structural strength of implant systems [24,32,48]. It should be noted, however, that due to engineering design constraints such as minimum wall thickness for proper mechanical performance of each of the different connection systems, differences in both external and internal features of the implant, abutment, and screw designs will exist.…”

Section: Discussionsupporting

confidence: 92%

“…Since the main challenges in the development of implantabutment connection designs comprises reducing the incidence of mechanical failures while improving the interface between soft tissue and implant-abutment junction [31,32], the evaluation of reliability and failure modes supported by evaluation of stress distribution in each component of platform-switched connections may provide insight into the mechanical behavior of different configurations of implant-abutment connection. Therefore, the present study sought to assess the effect of abutment's diameter shifting (regular and switched-platform) on reliability and failure modes of anatomically correct maxillary central incisor crowns varying the geometry of implant connection (internal and external hexagon).…”

Section: Introductionmentioning

confidence: 99%

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Biomechanical evaluation of internal and external hexagon platform switched implant-abutment connections: An in vitro laboratory and three-dimensional finite element analysis

et al. 2012

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d e n t a l m a t e r i a l s 2 8 ( 2 0 1 2 ) e218-e228Available online at www.sciencedirect.com j o u r n a l h o m e p a g e : w w w . i n t l . e l s e v i e r h e a l t h . c o m / j o u r n a l s / d e m a Objectives. The aim of this study was to assess the effect of abutment's diameter shifting on reliability and stress distribution within the implant-abutment connection for internal and external hexagon implants. The postulated hypothesis was that platform-switched implants would result in increased stress concentration within the implant-abutment connection, leading to the systems' lower reliability.Methods. Eighty-four implants were divided in four groups (n = 21): REG-EH and SWT-EH (regular and switched-platform implants with external connection, respectively); REG-IH and SWT-IH (regular and switched-platform implants with internal connection, respectively).The corresponding abutments were screwed to the implants and standardized maxillary central incisor metal crowns were cemented and subjected to step-stress accelerated life testing. Use-level probability Weibull curves and reliability were calculated. Four finite element models reproducing the characteristics of specimens used in laboratory testing were created. The models were full constrained on the bottom and lateral surface of the cylinder of acrylic resin and one 30 • off-axis load (300 N) was applied on the lingual side of the crown (close to the incisal edge) in order to evaluate the stress distribution (s vM ) within the implant-abutment complex.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Biomechanical evaluation of internal and external hexagon platform switched implant-abutment connections: An in vitro laboratory and three-dimensional finite element analysis

et al. 2012

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“…Given that the ceramic implant will be subjected to a humid environment and mastication in the oral cavity, cyclic fatigue tests are essential in assuring their success. Some recent studies have used cyclic loading to determine the durability of such implants under clinical conditions 17) rather than the static loading conventionally used 18,19) . Grinding, sandblasting, or acid-etching should be used to enhance osseointegration when zirconia is used for the implant body.…”

Section: Introductionmentioning

confidence: 99%

Influence of surface treatment of yttria-stabilized tetragonal zirconia polycrystal with hot isostatic pressing on cyclic fatigue strength

et al. 2013

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Hot isostatic pressing processed yttria-stabilized tetragonal zirconia polycrystal (HIP Y-TZP) has the potential for application to implants due to its high mechanical performance. The aim of this study was to investigate the influence of surface treatment of HIP Y-TZP on cyclic fatigue strength. HIP Y-TZP specimens were subjected to different surface treatments. Biaxial flexural strength was determined by both static and cyclic fatigue testing. In the cyclic fatigue test, the load was applied at a frequency of 10 Hz for 10 6 cycles in distilled water at 37°C. The surface morphology, roughness, and crystal phase of the surfaces were also evaluated. The cyclic fatigue strength (888 MPa) of HIP Y-TZP with sandblasting and acid-etching was more than twice that of Y-TZP as specified in ISO 13356 for surgical implants (320 MPa), indicating the clinical potential of this material.

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“…Other authors 13,21,22 emphasize that fatigue failures are system-dependent and occur in regions of fragility, particularly the screws, and especially in parts of the screw or between parts with and without threads of the abutments.…”

Section: Discussionmentioning

confidence: 99%

“…Khraisat et al 22 reported that between 1,800,000 and 5,000,000 cycles, severe failures occurred in samples subjected to cyclic tests. Other authors 13,21,22 emphasize that fatigue failures are system-dependent and occur in regions of fragility, particularly the screws, and especially in parts of the screw or between parts with and without threads of the abutments.…”

Section: Discussionmentioning

confidence: 99%

Analysis of resistance to fatigue between straight solid and anatomic abutments of Morse taper system

Gois-Santos

Trento

Santos

et al. 2016

Rev. odontol. UNESP

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ResumoContexto: O estudo do fenômeno de fadiga é essencial porque as falhas de implantes geralmente são causadas por este processo. Objetivo: O objetivo deste estudo foi analisar a resistência à fadiga de conjuntos de pilares retos e anatômicos que foram submetidos a cargas cíclicas. Material e método: Foram utilizados 37 implantes cone Morse e 37 pilares, divididos em dois grupos (n = 16: pilares retos, n = 21: pilares anatômicos). Os conjuntos foram submetidos à carga cíclica (5.000.000) usando o equipamento servo-hidráulico. Três conjuntos de cada grupo foram submetidos a testes de flexão para determinar a resistência de carga máxima, o que serviu de parâmetro para comparação dos testes cíclicos. Foram avaliados número de ciclos, carga e momento de flexão. Resultado: Dos 31 pilares ciclicamente testados, 17 (54,8%) fraturaram em menos de 5 milhões de ciclos; 8 (25,8%) destes eram pilares retos, e 9 (29%) eram anatômicos. Um total de 14 amostras (45,2%) resistiu à carga cíclica. De acordo com o teste exato de Fisher, não houve diferença entre os grupos quanto à fratura. Conclusão: Apesar dos pilares retos terem maior carga média e momento de flexão que os anatômicos, os dois tipos de pilares apresentaram desempenho semelhante quanto a resistência à fratura in vitro.Descritores: Implantes dentários; resistência de materiais; fenômenos mecânicos. AbstractBackground: The study of the phenomenon of fatigue is essential because implant failures usually are caused by this process. Purpose: The objective of this study was to examine the fatigue resistance of straight and anatomical abutments joints that were submitted to cyclic loads. Material and method: We used 37 Morse taper implants and 37 abutments, divided into two groups (n= 16: straight abutment, n= 21 anatomical abutment). The sets were submitted to cyclic loading (5 million) using servo-hydraulic equipment. Three sets from each group were subjected to bending tests to determine the maximum load resistance, which served as the parameter for comparison of the cyclic tests. We evaluated number of cycles, load and bending moment. Result: Of the 31 abutments cyclically tested, 17 (54.8%) fractured in fewer than 5 million cycles; 8 (25.8%) of these were straight abutments, and 9 (29%) were anatomical. A total of 14 samples (45.2%) resisted the cyclic loading. According to Fisher's exact test, there was no difference between groups as the fracture. Conclusion: Despite of the straight abutments have higher average load and bending moment on the anatomical, both types of abutments showed similar performance as the fracture strength in vitro.

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Fatigue resistance of two implant/abutment joint designs

Cited by 179 publications

References 8 publications

Biomechanical evaluation of internal and external hexagon platform switched implant-abutment connections: An in vitro laboratory and three-dimensional finite element analysis

Biomechanical evaluation of internal and external hexagon platform switched implant-abutment connections: An in vitro laboratory and three-dimensional finite element analysis

Influence of surface treatment of yttria-stabilized tetragonal zirconia polycrystal with hot isostatic pressing on cyclic fatigue strength

Analysis of resistance to fatigue between straight solid and anatomic abutments of Morse taper system

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