The effect of thread pattern upon implant osseointegration

Abuhussein, Heba; Pagni, Giorgio; Rebaudi, Alberto; Wang, Hom Lay

doi:10.1111/j.1600-0501.2009.01800.x

Cited by 299 publications

(336 citation statements)

References 32 publications

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“…Besides the advantages of decreased bone resorption, due to the great area of bone available, it would be helpful to achieve or maintain an implant's primary stability [44]. Implant thread design (height and width) is one of the most fundamental elements that affect an implant's primary stability and its ability to resist static and dynamic loading [44].…”

Section: Discussionmentioning

confidence: 99%

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Influence of microthreads and platform switching on stress distribution in bone using angled abutments

Ferraz

Anchieta

Almeida

et al. 2012

Journal of Prosthodontic Research

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Purpose: To evaluate the stress distribution in peri-implant bone by simulating the effect of an implant with microthreads and platform switching on angled abutments through tridimensional finite element analysis. The postulated hypothesis was that the presence of microthreads and platform switching would reduce the stress concentration in the cortical bone. Methods: Four mathematical models of a central incisor supported by an implant (5.0 mm Â 13 mm) were created in which the type of thread surface in the neck portion (microthreaded or smooth) and the diameter of the angled abutment connection (5.0 and 4.1 mm) were varied. These models included the RM (regular platform and microthreads), the RS (regular platform and smooth neck surface), the SM (platform switching and microthreads), and the SS (platform switching and smooth neck). The analysis was performed using ANSYS Workbench 10.0 (Swanson Analysis System). An oblique load (100 N) was applied to the palatine surface of the central incisor. The bone/implant interface was considered to be perfectly integrated. Values for the maximum (s max ) and minimum (s min ) principal stress, the equivalent von Mises stress (s vM ), and the maximum principal elastic strain (e max ) for cortical and trabecular bone were obtained. Results: For the cortical bone, the highest s max (MPa) were observed for the RM (55.1), the RS (51.0), the SM (49.5), and the SS (44.8) models. The highest s vM (MPa) were found for the RM (45.4), the SM (42.1), the RS (38.7), and the SS models (37). The highest values for s min were found for the RM, SM, RS and SS models. For the trabecular bone, the highest s max values (MPa) were observed in the RS model (6.55), followed by the RM (6.37), SS (5.6), and SM (5.2) models. Conclusion: The hypothesis that the presence of microthreads and a switching platform would reduce the stress concentration in the cortical bone was partially rejected, mainly because the microthreads increased the stress concentration in cortical bone. Only platform switching reduced the stress in cortical bone.

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Section: Discussionmentioning

confidence: 99%

“…Currently, implant companies have great interest in developing an ideal crest module [44]. Besides the advantages of decreased bone resorption, due to the great area of bone available, it would be helpful to achieve or maintain an implant's primary stability [44].…”

Section: Discussionmentioning

confidence: 99%

Influence of microthreads and platform switching on stress distribution in bone using angled abutments

Ferraz

Anchieta

Almeida

et al. 2012

Journal of Prosthodontic Research

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“…However, excessive loads result in IJOPRD microfractures, which in turn cause osteoclastogenesis. 29 When the bone remodeling capacity is insufficient to keep pace with the microdamage, these defects accumulate and coalesce to form a bigger defect. 27 As a consequence, the defect formed will fill with fibrous tissues and microorganisms.…”

Section: Discussionmentioning

confidence: 99%

A Three-dimensional Finite Element Analysis of Stress Distribution in the Cortical Bone in Single Tooth Implant and Post Core-treated Tooth subjected to variable Loads

Rao¹,

Arora²,

Hameed³

2017

International Journal of Prosthodontics and Restorative Dentistry

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Purpose: In spite of many advances in the field of prosthetic dentistry, the choice of whether to treat and retain a grossly compromised tooth or to extract and replace with an implant is debatable. Alveolar bone preservation is one of the main criteria to select the treatment option. This is directly affected by the stress generated in the cortical bone under variable loads and is therefore, relevant. Materials and methods:Two three-dimensional finite element models were generated in relation to maxillary second premolar using ANSYS software. Model-I was parallel-tapered titanium implant with screw-retained titanium abutment and porcelain fused to metal (PFM) crown. Model-P was fiber post and composite resin core with PFM crown. Luting cement was resin cement. Both the models were surrounded by homogeneous and isotropic cortical and cancellous bone, and were subjected to variable loads of 300, 400, and 500 N in axial (0°) and nonaxial (15°, 45°) directions. Results: Stress in the cortical bone in megapascal (MPa) inModel-I/Model-P when subjected to variable loads in newtons (N) in axial direction was 300 N -37.6 MPa/47.3 MPa; 400 N -50.2 MPa/63.0 MPa; 500 N -62.7 MPa/63.0 MPa. 15°-300 N -68.5 MPa/65.9 MPa; 400 N -91.3 MPa/87.9 MPa; 500 N -114.2 MPa/87.9 MPa. 45° -300 N -136.3 MPa/88.9 MPa; 400 N -181.8 MPa/118.5 MPa; 500 N -227.2 MPa/118.5 MPa. Conclusion:Within the limitation of this study, it was concluded that on axial loading, both the treatment modalities showed no significant difference, but on nonaxial loading, the cortical bone in the implant model showed to have considerably higher stress than post core-treated tooth model. Hence, given a choice, this study favors retaining and restoring a compromised tooth with post core and crown rather than extracting and replacing with an implant.

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“…Considering that successful establishment and maintenance of osseointegration are affected by biomechanics (1), numerous studies have been conducted on the engineering properties of dental implants, e.g., the types of implant-abutment connections (2)(3)(4).…”

Section: Introductionmentioning

confidence: 99%

External Hexagon Deformation in Implants Subjected to Internal Torque

Magalhães

Naves

Menezes³

et al. 2015

Braz. Dent. J.

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Failures may occur in the connections of dental implants, especially in external hexagon (EH). Due to the deformations in this portion of implants, this study aimed to evaluate the levels of deformation of EH connections subjected to internal toque. Two types of implants were used: N group and S group. Torques of 0, 32, 45, 60 and 80 Ncm were applied to the N group, and torques of 0, 30, 40, 60 and infinite Ncm were applied to the S group implants. The internal distance (ID), internal area (IA) and external area (EA) of the EH were obtained from digital pictures, which were analyzed by a specific software. Statistical analysis was performed by the Scott-Knott test. The results showed that the higher the torque applied, the greater were the changes in the evaluated dimensions in both groups. In the S group, torque levels equal or greater than 40 Ncm and 30 Ncm caused greater deformation of EA and IA respectively, while in the N group, torque levels equal or greater than 60 Ncm and 32 Ncm caused greater deformation of EA and IA respectively. Levels of deformation were greater in the S group as compared with the N group. These findings suggest that the IA, EA and ID of the EH may be affected by different internal torque levels.

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The effect of thread pattern upon implant osseointegration

Abstract: Appraising the current literature on this subject and combining existing data to verify the presence of any association between the selected characteristics may be critical in the achievement of overall implant success.

Cited by 299 publications

References 32 publications

Influence of microthreads and platform switching on stress distribution in bone using angled abutments

Influence of microthreads and platform switching on stress distribution in bone using angled abutments

A Three-dimensional Finite Element Analysis of Stress Distribution in the Cortical Bone in Single Tooth Implant and Post Core-treated Tooth subjected to variable Loads

External Hexagon Deformation in Implants Subjected to Internal Torque

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