Effect of bite force in occlusal adjustment of dental implants on the distribution of occlusal pressure: comparison among three bite forces in occlusal adjustment

Kayumi, Sho; Takayama, Yoshihisa; Yokoyama, Atsuro; Ueda, Nana

doi:10.1186/s40729-015-0014-2

Cited by 23 publications

(21 citation statements)

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“…The knowledge of the masticatory mechanism forces on the system of prosthesis over implant is crucial for failure prevention [4][5][6]. When an implant-supported prosthesis is submitted to a certain load [6][7][8], it promotes bone remodeling [6,9].…”

Section: Introductionmentioning

confidence: 99%

Stress and strain distributions on short implants with two different prosthetic connections – an in vitro and in silico analysis

Tribst

Piva

Rodrigues

et al. 2017

BDS

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101 ResumoObjetivo: Uma biomecânica ideal que minimiza a tensão entre implante e osso pode proporcionar sucesso para implantes osseointegrados. Este estudo avaliou a concentração de deformação no tecido circundante e a tensão nos componentes de dois implantes com diferentes conexões protéticas através de métodos in vitro e in silico. Material e Métodos: Vinte blocos de poliuretano foram divididos em dois grupos (n = 10), seguido da instalação de hexágono interno (IH) (AS Tecnologia -Titanium Fix, São José dos Campos, Brasil) ou de implantes cone morse (LT) (Bicon Dental Implants). Para o método da extensometria (SG), foram colocados quatro sensores ao redor dos implantes. Para a análise por elementos finitos (FEA), o mesmo bloco foi modelado e analisado. Foi aplicada uma carga axial (30 kgf) para ambas as metodologias. Os valores de tensão e deformação foram analisados quanto à correlação com o SG. Resultados: Para SG, LT apresentou uma média de deformação mais agressiva (-932) que IH (-632). Para FEA, a LT mostrou menor tensão (-547) que IH (-1169). Conclusão: Para os dois sistemas implantes, os valores de microdeformação capazes de induzir remodelação óssea indesejada não foram medidos. No entanto, para o implante IH, a presença de um parafuso de retenção tem a desvantagem de concentrar a tensão, enquanto um pilar sólido dissipa a carga axial através do implante, o que sugere um melhor desempenho para o grupo LT. ABsTRACTObjective: An ideal biomechanics minimizes the stress between implant and bone that can provide success for osseointegrated implants. This study evaluated the strain concentration in surrounding tissue and stress in the components of two implants with different prosthetic connections through an in vitro and in silico methods. Methods: Twenty polyurethane blocks were divided into two groups (n=10) followed by the installation of internal hexagon (IH) (AS Technology -Titanium Fix, São José dos Campos, Brazil) or locking taper implants (LT) (Bicon Dental Implants). For strain gauge (SG) method, four sensors were placed around the implants. For finite element analysis (FEA), the same block was modeled and analyzed. An axial load (30 kgf) was applied for both methodologies. The values of stress and strain were analyzed for correlation to SG. Results: For SG, LT presented a mean of strain most aggressive (-932) than IH (-632). For FEA, LT showed less stress (-547) then IH (-1169). Conclusion: For two implant's system, microstrain values capable to induce unwanted bone remodeling were not measured. However, for IH implant, the presence of a retention screw has the disadvantage to concentrate stress while a solid abutment dissipates the axial load through the implant that suggests a better performance for LT group.

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Section: Introductionmentioning

confidence: 99%

Stress and strain distributions on short implants with two different prosthetic connections – an in vitro and in silico analysis

Tribst

Piva

Rodrigues

et al. 2017

BDS

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“…The 3D FEMs were constructed based on those reported by Kasai et al [ 14 ], Kayumi et al [ 15 ] and consisted of a mandible, natural teeth with the periodontal ligament (PDL), and titanium implant(s) with superstructures in the left premolar and molar regions.…”

Section: Methodsmentioning

confidence: 99%

“…They described that the distribution of the occlusal force was greatest at molar region followed by the premolar and anterior region. Our theoretical model was based on Kasai [ 14 ] and Kayumi’s [ 15 ] reports. The theoretical model with natural teeth and no defect in Kayumi’s report and the occlusal force distribution in this model under load 400 N described later are shown in Figs.…”

Section: Methodsmentioning

confidence: 99%

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Significance of mandibular molar replacement with a dental implant: a theoretical study with nonlinear finite element analysis

2018

Self Cite

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BackgroundDental implants are frequently applied to unilateral defects in the mandible. However, implant placement in the molar region of the mandible can be difficult due to anatomical structure. The aim of this study was to evaluate the distribution of occlusal force in a mandibular shortened dental arch (SDA) with implants.MethodsThree-dimensional finite element (FE) models of the mandible with varying numbers of teeth and implants were constructed. Models Im6 and Im67 contained one and two implants in the defect of the left molar region, respectively. Models Im456 and Im4567 contained three and four implants in the defect of the left premolar and molar regions, respectively. Model MT67 contained a defect in the molar region with no implant placed. Model MT7 represented natural dentition without a left second molar, as a control. Modification of the condition of occlusal contacts assuming the intercuspal position was performed before analysis under load 400 N; therefore, the load condition as total force on the occlusal surface was 400 N. FE analyses were subsequently performed under load conditions of loads 100, 200, and 800 N. The distribution of reaction forces on the occlusal surface and the mandibular condyle was investigated.ResultsForce distribution in models Im67 and Im4567 appeared to be symmetrical under all load conditions. Occlusal force distribution in models Im6 and Im456 was similar to that in model MT7. However, the occlusal force at the second premolars on the defect side in those models was larger under loads 100 and 200 N. Conversely, the occlusal force on the first molars was much larger than that in model MT7 under load 800 N.ConclusionsWithin the limitations of this theoretical study, we demonstrated that restoration with the same number of implants as missing teeth will show almost symmetric occlusal force distribution, and it will produce less biomechanically stress for a unilateral defect of the mandible. However, if restoration of a missing second molar with an implant is impossible or difficult, then an SDA with implants may also be acceptable except for individuals with severe bruxism.

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“…However, living tissues are different [19]. In addition, the lateral load, which may occur in lateral movement of the mandible during mastication, was not considered in the FEA [20]. Additionally, a 100% implant-bone interface was simulated, which is impossible in clinical situations [19].…”

Section: Fea and Limitationsmentioning

confidence: 99%

Is bone density or implant design more important in implant stress formation in patients with bruxism?

Ayrancı

Sivrikaya

Ömezli

2017

Biotechnology & Biotechnological Equipment

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The aim of this study was to compare the stresses on cylindrical and conical dental implants under heavy bruxing forces, in D1 and D4 bone densities, using three-dimensional finite element analysis (FEA). Eight different stress models were created according to implant design (cylindrical or conical), bone density (D1 or D4) and load (1000 N, vertical or oblique). The von Mises stresses for each model were compared using FEA. The obtained results showed that D1 bone density and vertical force were associated with the least stress on the implant. Bone density was more important than implant design in stress formation. The results from the two implant types were very similar. The von Mises stress values were greater in the neck region of the implant. We suggest that the implant region should be considered firstly for less stress on the implant.

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Effect of bite force in occlusal adjustment of dental implants on the distribution of occlusal pressure: comparison among three bite forces in occlusal adjustment

Cited by 23 publications

References 22 publications

Stress and strain distributions on short implants with two different prosthetic connections – an in vitro and in silico analysis

Stress and strain distributions on short implants with two different prosthetic connections – an in vitro and in silico analysis

Significance of mandibular molar replacement with a dental implant: a theoretical study with nonlinear finite element analysis

Is bone density or implant design more important in implant stress formation in patients with bruxism?

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