Relationship between the <scp>CT</scp> Value and Cortical Bone Thickness at Implant Recipient Sites and Primary Implant Stability with Comparison of Different Implant Types

Howashi, Miori; Tsukiyama, Yoshihiro; Ayukawa, Yasunori; Isoda-Akizuki, Kei; Kihara, Masafumi; Imai, Yu; Sogo, Motofumi; Koyano, Kiyoshi

doi:10.1111/cid.12261

Cited by 21 publications

(13 citation statements)

References 31 publications

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“…Therefore, primary stability is one of the prerequisites for immediate loading. The design of the implant, quantity and density of the bone, and placement and surgical technique influence primary stability [ 2 3 4 5 6 7 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of implant tilting and the loading direction on the displacement and micromotion of immediately loaded implants: an in vitro experiment and finite element analysis

Sugiura

Yamamoto

Horita

et al. 2017

J Periodontal Implant Sci

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PurposeThe purpose of this study was to investigate the effects of implant tilting and the loading direction on the displacement and micromotion (relative displacement between the implant and bone) of immediately loaded implants by in vitro experiments and finite element analysis (FEA).MethodsSix artificial bone blocks were prepared. Six screw-type implants with a length of 10 mm and diameter of 4.3 mm were placed, with 3 positioned axially and 3 tilted. The tilted implants were 30° distally inclined to the axial implants. Vertical and mesiodistal oblique (45° angle) loads of 200 N were applied to the top of the abutment, and the abutment displacement was recorded. Nonlinear finite element models simulating the in vitro experiment were constructed, and the abutment displacement and micromotion were calculated. The data on the abutment displacement from in vitro experiments and FEA were compared, and the validity of the finite element model was evaluated.ResultsThe abutment displacement was greater under oblique loading than under axial loading and greater for the tilted implants than for the axial implants. The in vitro and FEA results showed satisfactory consistency. The maximum micromotion was 2.8- to 4.1-fold higher under oblique loading than under vertical loading. The maximum micromotion values in the axial and tilted implants were very close under vertical loading. However, in the tilted implant model, the maximum micromotion was 38.7% less than in the axial implant model under oblique loading. The relationship between abutment displacement and micromotion varied according to the loading direction (vertical or oblique) as well as the implant insertion angle (axial or tilted).ConclusionsTilted implants may have a lower maximum extent of micromotion than axial implants under mesiodistal oblique loading. The maximum micromotion values were strongly influenced by the loading direction. The maximum micromotion values did not reflect the abutment displacement values.

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Section: Introductionmentioning

confidence: 99%

Effects of implant tilting and the loading direction on the displacement and micromotion of immediately loaded implants: an in vitro experiment and finite element analysis

Sugiura

Yamamoto

Horita

et al. 2017

J Periodontal Implant Sci

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“…Once the hard and soft tissues of the oral cavity have been digitally recorded, e.g., by intraoral scanners and modern 3D radiograph technology, these data can serve as the basis for further digital process steps [ 1 ]. Before implant surgery, the final position of the implants can be determined virtually using planning software and 3D radiograph images.…”

Section: Introductionmentioning

confidence: 99%

The Digital Abutment Check: An Improvement of the Fully Digital Workflow

Hinz

Ellmann²,

Wegner

et al. 2020

Case Reports in Dentistry

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By using modern digitalization techniques, an existing denture can be digitized and aid the provision of a new implant-supported denture according to a fully digital workflow. This includes fully navigated implant surgery and results in an immediately provided prosthetic restoration. However, even with the current digital workflow, it is challenging to achieve a definitive prosthetic restoration in a single treatment session. In order to achieve a definitive denture in as few treatment sessions as possible, we have implemented the digital abutment test. This test modified the existing data set and determined the final restoration. In the present case, the preexisting maxillary removable complete denture was converted into a fixed immediate restoration using the fully digital workflow. The workflow is divided into two treatment phases, each with three treatment sessions, where part of the second phase involves an innovative digital abutment check. The illustrated case shows an effective use of current digital possibilities. Special attention was also paid to a minimally invasive course of therapy.

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“…The microstructure associated with porous features, such as vascular channels, may have contributed influences to the stress concentrations and stress shielding around implants, yet the importance of these channels in the mechanical behaviour of cortical bone is not well understood. The design and integration of an implant and understanding of the bone‐prosthesis interface are important factors in prosthetic design, but the interaction between prosthesis and cortical bone at a fundamental microstructural level is relatively poorly understood . It is proposed that if one can characterize how the heterogeneity in the microstructure affects the macroscale stress, particularly periprosthetically, this may herald a greater potential for innovative, longer lasting prostheses designs.…”

Section: Introductionmentioning

confidence: 99%

A numerical investigation and experimental verification of size effects in loaded bovine cortical bone

Frame

Wheel

Riches

2017

Numer Methods Biomed Eng

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In this paper, we present 2-and 3-dimensional finite element-based numerical models of loaded bovine cortical bone that explicitly incorporate the dominant microstructural feature: the vascular channel or Haversian canal system. The finite element models along with the representation of the microstructure within them are relatively simple: 2-dimensional models, consisting of a structured mesh of linear elastic planar elements punctuated by a periodic distribution of circular voids, are used to represent beam samples of cortical bone in which the channels are orientated perpendicular to the sample major axis, while 3-dimensional models, using a corresponding mesh of equivalent solid elements, represent those samples in which the canals are aligned with the axis. However, these models are exploited in an entirely novel approach involving the representation of material samples of different sizes and surface morphology. The numerical results obtained for the virtual material samples when loaded in bending indicate that they exhibit size effects not forecast by either classical (Cauchy) or more generalized elasticity theories. However, these effects are qualitatively consistent with those that we observed in a series of carefully conducted experiments involving the flexural testing of bone samples of different sizes. Encouraged by this qualitative agreement, we have identified appropriate model parameters, primarily void volume fraction but also void separation and matrix modulus by matching the computed size effects to those we observed experimentally. Interestingly, the parameter choices that provide the most suitable match of these effects broadly concur with those we actually observed in cortical bone.KEYWORDS cortical bone, finite element analysis, generalized continuum, mechanical behaviour, micropolar (Cosserat) elasticity, size effect

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Relationship between the CT Value and Cortical Bone Thickness at Implant Recipient Sites and Primary Implant Stability with Comparison of Different Implant Types

Abstract: Obtained results suggest that the primary stability of implants could be quantitatively estimated using the CT value preoperatively, indicating the CT value of bone surrounding an implant can contribute considerably to implant planning and design choice in clinical situations.

Cited by 21 publications

References 31 publications

Effects of implant tilting and the loading direction on the displacement and micromotion of immediately loaded implants: an in vitro experiment and finite element analysis

Effects of implant tilting and the loading direction on the displacement and micromotion of immediately loaded implants: an in vitro experiment and finite element analysis

The Digital Abutment Check: An Improvement of the Fully Digital Workflow

A numerical investigation and experimental verification of size effects in loaded bovine cortical bone

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