Innovative implant design for continuous implant stability: A mechanical and histological experimental study in the iliac crest of goats

Background. The immediate placement of a dental implant could represent an option treatment for the rehabilitation of a postextractive missing tooth socket to replace compromised or untreatable teeth, with the advantage of single-session surgery. In this way, the anatomy of the alveolar bone defect, the preservation of the buccal cortical bone, and the primary stability of the fixture represent the critical factors that consent a precise implant placement. Objective. This case report describes a novel fixture design for postextractive alveolar socket immediate implant. Methods. Two patients (25 and 31 years old) were treated for postextractive dental implant placement to replace both central upper incisor teeth with four implants. The residual bone implant gap was not filled with graft or bone substitute. The restoration was provided following a standard loading protocol by a cement-sealed prosthetic abutment. Results. Clinically, all implants positioned showed an excellent insertion torque. No postoperative complications were reported. At 6 months of healing, the buccal cortical bone and the implant stability were present and well maintained. Conclusion. The evidence of this study allows us to underline the possible advantages of this new fixture design for postextractive implant technique.

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Implant stability during osseointegration in irradiated and non-irradiated minipig alveolar bone: an experimental study

Clinical Oral Implants Research ◽

10.1111/j.1600-0501.2007.01457.x ◽

2008 ◽

Vol 19 (2) ◽

pp. 201-206 ◽

Cited By ~ 25

Author(s):

Henk W. D. Verdonck ◽

Gert J. Meijer ◽

Thorsten Laurin ◽

Fred H. Nieman ◽

Christian Stoll ◽

...

Keyword(s):

Experimental Study ◽

Alveolar Bone ◽

Implant Stability

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Does Implant Design Affect Implant Primary Stability? A Resonance Frequency Analysis–Based Randomized Split-Mouth Clinical Trial

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-13-00294 ◽

2015 ◽

Vol 41 (6) ◽

pp. e281-e286 ◽

Cited By ~ 16

Author(s):

Sergio Alexandre Gehrke ◽

Ulisses Tavares da Silva ◽

Massimo Del Fabbro

Keyword(s):

Standard Deviation ◽

Resonance Frequency ◽

Frequency Analysis ◽

Primary Stability ◽

Implant Design ◽

Resonance Frequency Analysis ◽

Implant Stability ◽

The Mean ◽

Group 2 ◽

Group 1

The purpose of this study was to assess implant stability in relation to implant design (conical vs. semiconical and wide-pitch vs narrow-pitch) using resonance frequency analysis. Twenty patients with bilateral edentulous maxillary premolar region were selected. In one hemiarch, conical implants with wide pitch (group 1) were installed; in the other hemiarch, semiconical implants with narrow pitch were installed (group 2). The implant allocation was randomized. The implant stability quotient (ISQ) was measured by resonance frequency analysis immediately following implant placement to assess primary stability (time 1) and at 90 days after placement (time 2). In group 1, the mean and standard deviation ISQ for time 1 was 65.8 ± 6.22 (95% confidence interval [CI], 55 to 80), and for time 2, it was 68.0 ± 5.52 (95% CI, 57 to 77). In group 2, the mean and standard deviation ISQ was 63.6 ± 5.95 (95% CI, 52 to 78) for time 1 and 67.0 ± 5.71 (95% CI, 58 to 78) for time 2. The statistical analysis demonstrated significant difference in the ISQ values between groups at time 1 (P = .007) and no statistical difference at time 2 (P = .54). The greater primary stability of conical implants with wide pitch compared with semiconical implants with narrow pitch might suggest a preference for the former in case of the adoption of immediate or early loading protocols.

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A validated finite element study of stress shielding in a novel hybrid knee implant

10.32920/ryerson.14649990.v1 ◽

2021 ◽

Author(s):

Ziauddin Mahboob

Keyword(s):

Experimental Study ◽

Finite Element ◽

Finite Element Model ◽

Bone Tissue ◽

Stress Shielding ◽

Stress Transfer ◽

Element Model ◽

Implant Design ◽

Polyamide 12 ◽

Compressive Loads

This study (1) proposes a hybrid knee implant design to improve stress transfer to bone tissue in the distal femur by modifying a conventional femoral implant to include a layer of carbon fibre reinforced polyamide 12, and (2) develops a finite element model of the prosthetic knee joint, validated by comparison with a parallel experimental study. The Duracon knee system was used in the experimental study, and its geometry was modelled using CAD software. Synthetic bone replicas were used instead of cadaveric specimens in the experiments. The strains generated on the femur and implant surfaces were measured under axial compressive loads of 2000 N and 3000 N. A mesh of 105795 nodes was needed to obtain sufficient accuracy in the finite element model, which reproduced the experimental reading within 10-23% in six of the eight test locations. The model of the proposed hybrid design showed considerable improvements in stress transfer to the bone tissue at three test flexion angles of 0°, 20°, and 60°.

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Reliability and Correlation of Different Devices for the Evaluation of Primary Implant Stability: An In Vitro Study

Materials ◽

10.3390/ma14195537 ◽

2021 ◽

Vol 14 (19) ◽

pp. 5537

Author(s):

Perry Raz ◽

Haya Meir ◽

Shifra Levartovsky ◽

Maia Peleg ◽

Alon Sebaoun ◽

...

Keyword(s):

In Vitro Study ◽

Implant Design ◽

Implant Stability ◽

High Positive Correlation ◽

Primary Implant ◽

Conical Connection ◽

Vitro Model ◽

Implant Length ◽

Positive Significant Correlation

Our aim was to analyze the correlation between the IT evaluated by a surgical motor and the primary implant stability (ISQ) measured by two RFA devices, Osstell and Penguin, in an in vitro model. This study examines the effect of bone type (soft or dense), implant length (13 mm or 8 mm), and implant design (CC: conical connection; IH: internal hexagon), on this correlation. Ninety-six implants were inserted using a surgical motor (IT) into two types of synthetic foam blocks. Initial measurements for both the peak IT and ISQ were recorded at the point when implant insertion was stopped by the surgical motor, and the final measurements were recorded when the implant was completely inserted into the synthetic blocks using only the RFA devices. Our null hypothesis was that there is a good correlation between the devices, independent of the implant length, design, or bone type. We found a positive, significant correlation between the IT, and the Osstell and Penguin devices. Implant length and bone type did not affect this correlation. The correlation between the devices in the CC design was maintained; however, in the IH design it was maintained only between the RFA devices. We concluded that there is a high positive correlation between the IT and ISQ from a mechanical perspective, which was not affected by bone type or implant length but was affected by the implant design.

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