Implant Biomechanics in Grafted Sinus: A Finite Element Analysis

Fanuscu, Mete I.; Hùng, Vũ Văn; Poncelet, Bernard

doi:10.1563/0.674.1

Cited by 42 publications

(48 citation statements)

References 19 publications

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“…Decrease in stresses in a 7-mm native bone model in comparison with 3-4-mm models were found and similar values were obtained with 10-mm models. Present findings related to increase in bone strains under laterally axial loading was consistent with findings of other studies [9,15,16].…”

Section: Dıscussıonsupporting

confidence: 93%

Bone strains around apically free versus grafted implants in the posterior maxilla of human cadavers

Çehreli¹,

Akkocaoğlu

Cömert

et al. 2007

Med Bio Eng Comput

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The objective of this study was to compare the bone strains of apically free versus grafted implants in the posterior maxilla. The experiments were undertaken in four edentulous maxillary posterior regions of fresh human cadavers, having a minimum bone height of 8 mm. In each bone fragment, two Ø 4.1 mm x 12 mm Straumann implants were placed, and insertion torque values (ITV) and implant stability quotients (ISQ) of the implants were quantified to determine implant anchorage. Two splinted crowns were fabricated for each experimental model. Strain gauges were bonded on the buccal and sinus floor cortical bones around apically free and grafted implants. Microstrains were recorded by a data acquisition system and corresponding software at a sample rate of 10 KHz under central and buccally oriented lateral-axial static loads of 100 and 150 N in separate cases. The data were compared by independent T test at a significance level set at P<0.05. Bone tissue strains on the buccal cortical areas adjacent to apically free implants were higher than those of apically grafted implants (P<0.05). The differences ranged between 10 and 48 mu epsilon under central and lateral axial loads of 100 and 150 N. The shift in load application from central to buccally oriented lateral axial mode increased strains between 60 and 201 mu epsilon on buccal cortical bone around apically free and grafted implants (P<0.05). Bone strains around anterior implants were higher than those of posterior implants. Microstrains in the sinus floor cortical bone in apically grafted models were slightly higher than apically free models. Bone tissue strains on the buccal cortical areas adjacent to apicallyfree implants are higher than those of apically grafted implants. Sinus lifting, resulting in an enhanced apical support, slightly increases strains at the sinus floor region, but leads to a decrease in bone strains around the collar of supporting implants.

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Section: Dıscussıonsupporting

confidence: 93%

Bone strains around apically free versus grafted implants in the posterior maxilla of human cadavers

Çehreli¹,

Akkocaoğlu

Cömert

et al. 2007

Med Bio Eng Comput

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“…A number of finite element analysis studies showed, that when axial and lateral physiologic forces are applied to the implant, high peak stresses are generated in cortical bone (Fanuscu et al 2004;Himmlova et al 2004;Tada et al 2003). Other in vitro studies show, that loss or absence of cortical bone results in stress transfer to cancellous bone, whose stiffness is 10 times lower, than cortical bone and may not be able to withstand the stresses subjected to the implant, resulting in implant destabilization and subsequent loss (Watzek G. 2004).…”

Section: I31 A) Early Crestal Bone Lossmentioning

confidence: 99%

Marginal bone and soft tissue behavior following platform switching abutment connection/disconnection– a dog model study

Alves

Muñoz

González‐Cantalapiedra

et al. 2014

Clinical Oral Implants Res

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Marginal bone and soft tissue behavior following platform switching abutment connection/disconnection -a dog model study PhD THESIS Célia Coutinho AlvesAutorización do Director / Tutor da Tese (RD 778/1998) RESUMENLa literatura científica parece indicar que la conexión/desconexión del pilar protésico puede provocar alteraciones en la inserción epitelial, causando sangrado y ulceración en el mismo. Esta ruptura mecánica se puede considerar como una herida abierta con la exposición del tejido conjuntivo, lo cual puede resultar en una respuesta inflamatoria y consecuentemente en migración apical epitelial.Esta tesis resume un trabajo de investigación experimental "in vivo" diseñado con el objetivo principal de evaluar histológicamente el comportamiento del tejido óseo marginal, cuando se manipula, repetidamente, el pilar de conexión en implantes "switching-platform" colocados en perros Beagle.El objetivo secundario del estudio fue evaluar el comportamiento marginal de tejido blando tanto histológicamente (anchura bilógica) como clínicamente (cambios en el margen de la encía), y radiográficamente el comportamiento marginal de tejido duro (nivel óseo marginal), variando sólo la estabilidad de la conexión del pilar durante el procedimiento estándar de colocación de implantes Straumann® Bone Level la y su rehabilitación protésica.Se seleccionaron seis perros Beagle adultos fueron seleccionados, y se extrajeron los pre-molares en las posiciones Pm3 y Pm4 del ambos lados izquierdo y derecho, dejando un período de cicatrización de 3 meses. En este momento, se colocaron 24 implantes (BL) (Straumann®, Basilea, Suiza) Ø 3.3 / 8 mm, dos en cada lado y en las regiones Pm3 y Pm4. En uno de los lados (grupo control), se colocaron 12 pilares de cicatrización cónicos Ø 3,6 mm, y en el otro lado (grupo teste) lado, se conectaron 12 pilares multibase Narrow CrossFit TM (NC) (Straumann®, Basilea, Suiza) en el momento de la cirugía de colocación de los implantes. En el grupo test, todos los procedimientos de prótesis se realizaron directamente al pilar multibase pilar sin desconectarlo, y en el grupo control, el pilar multibase se conectó / desconectó cinco veces (en las semanas 6/8/10/12/14) durante los procedimientos protésicos.Posteriormente se confeccionaron 12 puentes fijos metálicos y se atornillaron 14 semanas después de la colocación de los implantes. Una visita de higiene / control fue realizada seis meses después de la colocación de los implantes. Los animales fueran sacrificados a los 9 meses del estudio. Los parámetros clínicos y radiográ-ficos (peri-apicales) se registraron en cada visita. El análisis histométrico se realizó para los 24 implantes. La distancia desde el hombro del pilar multibase al primero contacto del implante con hueso (S-BIC) se definió como variable principal. PhD THESIS Célia Coutinho alves PhD THESIS Célia Coutinho alvesMarginal bone and soft tissue behavior following platform switching abutment connection/ disconnection -a dog model study 16Marginal bone and soft tissue behavior following...

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“…FE models with complex geometric structures can be easily modified to accommodate various assumptions. The quality of the FE model is determined by its concurrence with anatomical and natural conditions [2,11,13,[21][22][23].…”

Section: Discussionmentioning

confidence: 99%

“…For cortical bone, compact bone and bone grafts, Young's modulus is 14 GPa and Poisson's ratio µ = 0.30. For titanium alloy, Young's modulus is 103.4 GPa and Poisson's ratio µ = 0.35 [13].…”

Section: Contact Definitionmentioning

confidence: 99%

Three-Dimensional Finite Element Analysis of Maxillary Sinus Floor Augmentation with Optimal Positioning of a Bone Graft Block

et al. 2018

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Purpose: the aim of the computational 3D-finite element study is to evaluate the influence of an augmented sinus lift with additional inserted bone grafting. The bone graft block stabilizes the implant in conjunction with conventional bone augmentation. Two finite element models were applied: the real geometry based bone models and the simplified geometry models. The bone graft block was placed in three different positions. The implants were loaded first with an axial force and then with forces simulating laterotrusion and protrusion. This study examines whether the calculated stress behavior is symmetrical for both models. Having established a symmetry between the primary axis, the laterotrusion and protrusion behavior reduces calculation efforts, by simplifying the model. Material and Methods: a simplified U-shaped 3D finite element model of the molar region of the upper jaw and a more complex anatomical model of the left maxilla with less cortical bone were created. The bone graft block was placed in the maxillary sinus. Then the von Mises stress distribution was calculated and analyzed at three block positions: at contact with the sinus floor, in the middle of the implant helix and in the upper third of the implant. The two finite element models were then compared to simplify the modelling. Results: the position of the bone graft block significantly influences the magnitude of stress distribution. A bone graft block positioned in the upper third or middle of the implant reduces the quantity of stress compared to the reference model without a bone graft block. The low bone graft block position is clearly associated with lower stress distribution in compact bone. We registered no significant differences in stress in compact bone with regard to laterotrusion or protrusion. Conclusions: maximum values of von Mises stresses in compact bone can be reduced significantly by using a bone graft block. The reduction of stress is nearly the same for positions in the upper third and the middle of the implant. It is much more pronounced when the bone graft block is in the lower third of the implant near the sinus floor, which appeared to be the best position in the present study.

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Implant Biomechanics in Grafted Sinus: A Finite Element Analysis

Cited by 42 publications

References 19 publications

Bone strains around apically free versus grafted implants in the posterior maxilla of human cadavers

Bone strains around apically free versus grafted implants in the posterior maxilla of human cadavers

Marginal bone and soft tissue behavior following platform switching abutment connection/disconnection– a dog model study

Three-Dimensional Finite Element Analysis of Maxillary Sinus Floor Augmentation with Optimal Positioning of a Bone Graft Block

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