General Information about Implant Abutments

Shafie, Hamid R.

doi:10.1002/9781118928547.ch2

Cited by 5 publications

(8 citation statements)

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“…Endosseous dental implants are used to retain and/or support prosthesis for a variety of tooth loss situations [ 3 ]. Brånemark’s historical discovery of implant began with the abutment connection [ 4 ]. Brånemark system was developed for facilitating implant insertion by characteristic external hexagon design feature rather than providing an anti-rotational effect [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…A hexagon is a six-sided shape used at the abutment–implant interface as an anti-rotational feature whereas external connection is a type of connection feature that extends above the coronal portion of an implant. Abutment connections can be external spline or external octagon, but external hex is the most common one [ 4 ]. This configuration has been incorporated in various implant systems and has served well over the years [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, there was little interest in anti-rotational feature. For the facilitation of the surgical placement of implant, the external hex portion was added to the design [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

“…There are advantages as well as disadvantages with external hex connection, these being availability of long-term follow-up data and being well suited and adapted to various implant systems; moreover, if complications arise, due to their extensive use, solutions are found throughout the literature. Shortcomings are high occurrence of screw loosening, rotational misfit, compromised aesthetic result, and microbial seal being inadequate [ 4 ]. In spite of having disadvantages, due to the long-term follow-up data, external hex is still used by some manufacturers, owing to its advantages.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Stress Distribution and Force in External Hexagonal Implant: A 3-D Finite Element Analysis

Bandela

Basany

Nagarajappa

et al. 2021

IJERPH

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Purpose: To analyze the stress distribution and the direction of force in external hexagonal implant with crown in three different angulations. Materials and Methods: A total of 60 samples of geometric models were used to analyze von Mises stress and direction of force with 0-, 5-, and 10-degree lingual tilt. Von Mises stress and force distribution were evaluated at nodes of hard bone, and finite element analysis was performed using ANSYS 12.1 software. For calculating stress distribution and force, we categorized and labeled the groups as Implant A1, Implant A2, and Implant A3, and Implant B1, Implant B2, and Implant B3 with 0-, 5-, and 10-degree lingual inclinations, respectively. Inter- and intra-group comparisons were performed using ANOVA test. A p-value of ≤0.05 was considered statistically significant. Results: In all the three models, overall maximum stress was found in implant model A3 on the implant surface (86.61), and minimum was found on model A1 in hard bone (26.21). In all the three models, the direction of force along three planes was maximum in DX (0.01025) and minimum along DZ (0.002) direction with model B1. Conclusion: Maximum von Mises stress and the direction of force in axial direction was found at the maximum with the implant of 10 degrees angulation. Thus, it was evident that tilting of an implant influences the stress concentration and force in external hex implants.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Thus, there was little interest in anti-rotational feature. For the facilitation of the surgical placement of implant, the external hex portion was added to the design [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluation of Stress Distribution and Force in External Hexagonal Implant: A 3-D Finite Element Analysis

Bandela

Basany

Nagarajappa

et al. 2021

IJERPH

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“…CAD/CAM abutments are widely used. They undoubtedly present the great advantage of the complete customization of shape, dimension and emergence profile [ 2 , 3 ]. On the contrary, stock abutments present the certainty of coupling between components as designed by the manufacturer [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Marginal Vertical Fit along the Implant-Abutment Interface: A Microscope Qualitative Analysis

et al. 2016

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The aim of this study was to qualitatively evaluate the marginal vertical fit along two different implant-abutment interfaces: (1) a standard abutment on an implant and (2) a computer-aided-design/computer-aided-machine (CAD/CAM) customized screw-retained crown on an implant. Four groups were compared: three customized screw-retained crowns with three different “tolerance” values (CAD-CAM 0, CAD-CAM +1, CAD-CAM −1) and a standard titanium abutment. Qualitative analysis was carried out using an optical microscope. Results showed a vertical gap significantly different from both CAD-CAM 0 and CAD-CAM −1, while no difference was found between standard abutment and CAD-CAM +1. The set tolerance in producing CAD/CAM screw-retained crowns plays a key role in the final fit.

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Hybrid-abutment-restoration: effect of material type on torque maintenance and fracture resistance after thermal aging

2020

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Purpose: To evaluate the tightening torque maintenance with zirconia, lithium disilicate, and polyetheretherketone (PEEK) hybrid-abutment-crowns after thermal aging, in addition to assess the fracture resistance of hybridabutment-crowns fabricated with different materials. Materials and methods: Thirty implants were restored with identical hybrid-abutment-crowns, resembling the maxillary first premolar, fabricated from zirconia (Zr), lithium disilicate (L2), or ceramic-reinforced PEEK (PE). The three groups (n = 10) were constructed utilizing a Ti-base. After bonding, each restoration was secured in its respective implant with a torque of 25 Ncm. All restorations were subjected to thermal aging for 7000 cycles. The loosening torque was assessed utilizing the digital torque meter. Each restoration was subjected to fracture testing and the mode of failure was determined. Results: Zr group displayed the highest mean torque loss value (2.70 ± 0.59 Ncm) with the mean loosening torque value of 22.38 ± 0.68 Ncm. PE group displayed the lowest mean torque loss (2.55 ± 0.50 Ncm) with mean loosening torque value of 22.61 ± 0.59 Ncm. There was no significant difference between study groups regarding loosening torque (p = 0.68), torque loss (p = 0.80), and percentage of torque loss (p = 0.79). There was significant difference regarding the mean fracture load value between Zr and PE groups. However, there was no significant difference (p = 0.05) regarding mean fracture load value between L2 and PE groups. Conclusion: The hybrid-abutment-crown material does not affect the torque maintenance after thermal aging. Based on fracture load, zirconia hybrid-abutment-crown can be used, while lithium disilicate and PEEK hybridabutment-crowns may cautiously serve in premolar region.

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General Information about Implant Abutments

Cited by 5 publications

References 0 publications

Evaluation of Stress Distribution and Force in External Hexagonal Implant: A 3-D Finite Element Analysis

Evaluation of Stress Distribution and Force in External Hexagonal Implant: A 3-D Finite Element Analysis

Marginal Vertical Fit along the Implant-Abutment Interface: A Microscope Qualitative Analysis

Hybrid-abutment-restoration: effect of material type on torque maintenance and fracture resistance after thermal aging

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