Analysis of load transfer and stress distribution by an implant-supported fixed partial denture

Assif, David; Marshak, B; Horowitz, Amir

doi:10.1016/s0022-3913(96)90486-2

Cited by 61 publications

(60 citation statements)

References 8 publications

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“…They found that to maintain its physiological characteristics of elasticity, it was necessary to freeze the bone in -20ºC saline after removal. 20 Polyurethane is therefore employed because this substrate is used in various research work with extensometry to simulate human bone marrow 10,[22][23][24][25][26][27][28][29] . Such authors state that polyurethane has a modulus of elasticity similar to human bone (Polyurethane: 3.6GPa / medullary bone: 4.0 to 4.5GPa) and is a homogeneous and isotropic substrate.…”

Section: Discussionmentioning

confidence: 99%

“…10,23,24,28,35 In his study, Goll 35 recommends a clinical protocol to be followed when making prosthetic implants. One of the recommendations for measures to avoid mismatch of the prosthetic implant is casting in a single block.…”

Section: Discussionmentioning

confidence: 99%

“…19,22 Extensometer bonding was performed strategically to record microstrain on the polyurethane in the region adjacent to the implant in the cervical direction according some authors. 19,20,[23][24][25][26][27] But another authors 31,32,36,37 have bonded extensometers onto the surface of prosthetic abutments, but bonding in this region is difficult for the following reasons: the circular shape of the abutments makes bonding difficult and can result in errors during reading; the degree of strain suffered by this region is very low, which may mask the load distribution generated on the implant retention substrate; and the region around the implants is the area of the greatest distribution of masticatory load. 19,[25][26][27] When the load is applied to the cantilever, the extensometer of the implant distal nearest to the cantilever shows greater deformation, and the greater the cantilever length, the greater the surface strain on the bone, corroborating the study by Tashkandi et al 19 We could see at times that when applying the load on the cantilever, the bar bent, which may have influenced the lower results found for some extensometers.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Different Abutments and Connections in Deformation Crestal Bone

et al. 2016

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Effect of Different Abutments and Connections in Deformation Crestal Bone

et al. 2016

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“…This array of colored patterns is called isochromatic fringes. Studies with photoelastic analysis have been throughly conducted to determine the stress distribution around natural teeth, abutments of removable partial prosthesis and fixed partial prosthesis 8 ; around endosseous implants under complete dentures 9,14 or to determine stresses around endosseous implants supporting fixed prosthesis 1,6,8,12,13,15,17 . The stress distribution around implants placed in the first molar mandibular area was biomechanically analyzed in a two-dimensional mathematical model according to the work of Canay et al 5 (1996).…”

Section: Introductionmentioning

confidence: 99%

Photoelastic analysis of stress distribution on parallel and angled implants after installation of fixed prostheses

et al. 2004

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bone-resorption may occur. The loading threshold tolerated by the bone is not well-known and the failure of osseointegration can be caused by bone resorption as a result of unfavorable stress concentrations 11 . In accordance to Kohn 16 (1992), tension distribution is one of the important factors related to implant success; the tensions should be transferred to the adjacent bone, preferentially in an orientation and magnitude that keep the tissues viability near a physiologic state. * Graduate Students; **Assistant Professors -Department of Prosthodontics, School of Dentistry, University of São Paulo. ABSTRACT:The longevity of implant-supported prosthetic rehabilitation depends largely on how the masticatory forces are transferred to the implants and surrounding bone. Anatomical conditions, bone morphology and aesthetics usually dictate implant placement in less than ideal positions for prosthetic rehabilitation and sometimes it is possible to find them with different inclinations. The purpose of this paper was to compare, through photoelastic analysis, the stress distribution in a fixed prosthesis with 3 parallel implants, to the stress distribution in the same prosthesis in the existence of an angled central implant. Two photoelastic resin models were made and a polariscope was used in the visualization of isochromatic fringes formed in the models when axial loads of 2 kg, 5 kg and 10 kg were applied to a unique central point of the prosthesis. The presence of inducted tensions (preloads) was observed in the models after applying torque to the retention screws. Preloads were intensified with the incidence of occlusal forces. In the parallel implants, the force dissipation followed the long axis. The angled implant had a smaller quantity of fringes and the stresses were located mostly around the apical region of the lateral implants. DESCRIPTORS: Dental implantation, endosseous; Prosthesis implantation. RESUMO:A longevidade das reabilitações orais implanto-suportadas depende, em grande parte, de como as forças mastigatórias são transferidas aos implantes e ao osso que os circunda. Condições anatômicas, morfologia óssea e estética muitas vezes ditam a colocação de implantes em posições que não são ideais para a reabilitação protética, e podemos encontrá-los com diferentes inclinações. A proposta deste trabalho foi comparar, através de análise fotoelástica, a dissipação de tensões em uma prótese fixa com 3 implantes paralelos entre si com a dissipação de tensões na mesma prótese na existência do implante central angulado. Foram confeccionados dois modelos de resina fotoelástica. Utilizou-se um polariscópio para visualização das franjas isocromáticas que se formaram nos modelos fotoelásticos quando cargas axiais de 2 kg, 5 kg e 10 kg foram aplicadas em um mesmo ponto central da prótese. Verificou-se a indução de tensões (pré-tensões) nos modelos após o apertamento dos parafusos de retenção das próteses. As pré-tensões foram agravadas com a incidência de forças oclusais. Nos implantes paralelos, a dissipação de for...

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“…The birefringence analysis, the strain gauge, and the bond strength studies between the implant and bone tissues, according to Spiekermann 1995, have been the main methods for biomechanical analysis and investigation. The strain gauge technique has been used to evaluate stresses in implantsupported prosthesis both in vitro [10,11], and in vivo [12,13].…”

Section: Introductionmentioning

confidence: 99%

Strain Gauge analysis of non-axial loads in three-element implant-supported prostheses

Sousa¹,

Lelis²,

Santos³

et al. 2013

BDS

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This study evaluated “in vitro”, the microstrain around three external hexagon implants linearly placed after static loadings on non-axial points of Co-Cr superstructures. The implants were inserted into a polyurethane block and their microunit prosthetic abutments were screwed with torque of 20 Ncm. Four strain gauges were linked to the block around the implants. Onto the abutments, Co-Cr superstructures (n = 5) were screwed with torque of 10 Ncm. The static vertical loads of 30 kg were applied for 10 s during 3 repetitions in four non-axial points located perpendicularly to the long axis (A and B) and another two points at the extremity of the superstructure (A` and B`). The data were recorded with the aid of a conditioner of electrical signals and the Strain-Smart software. The results obtained were submitted to Analysis of Variance (ANOVA). It could be concluded that there were no significant differences in the effects of the applications of non-axial loads of this present study (p = 0.6464). Also, there were no differences between the displacement means, 3 mm for A and B; 5 mm for A’ and B’ (p = 0.8731). KeywordsBiomechanics, Dental implant, Dental prosthesis.

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Analysis of load transfer and stress distribution by an implant-supported fixed partial denture

Cited by 61 publications

References 8 publications

Effect of Different Abutments and Connections in Deformation Crestal Bone

Effect of Different Abutments and Connections in Deformation Crestal Bone

Photoelastic analysis of stress distribution on parallel and angled implants after installation of fixed prostheses

Strain Gauge analysis of non-axial loads in three-element implant-supported prostheses

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