An Evaluation of Fit in Osseointegrated Implant Components Using Torque/Turn Analysis

Wicks, Russell; Rijk, Waldemar G. de; Windeler, A. Stewart

doi:10.1111/j.1532-849x.1994.tb00157.x

Cited by 19 publications

(10 citation statements)

References 8 publications

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“…In these cases, primary stability into the bone is very important, and this depends on the value of the torque applied during surgical placement. 11,16,17 Misch 14 (2004) established a minimum torque of 30 Ncm so that the implants could obtain primary stability for immediate loading. In other words, to be considered stable, the implant could not turn or show any mobility after the torque of 30 Ncm was reached.…”

Section: Discussionmentioning

confidence: 99%

“…The biomechanical complications reported are loosening or fracturing of the abutment and prostheses screws. [2][3][4][5][6][7][8][9][10][11] Therefore, the external hexagon connection continues to be comprehensively studied with the aim of improving the dimensional machining tolerances of the components, 12 and making this screwed junction more stable. [3][4][5]7,9 The rotational freedom between implant and abutment depends on the hexagon dimensions that are in connection.…”

Section: Introductionmentioning

confidence: 99%

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In vitro integrity of implant external hexagon after application of surgical placement torque simulating implant locking

Davi¹,

Golin

Bernardes

et al. 2008

Braz. oral res.

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The aim of this study was to evaluate the integrity of the external hexagon of an implant system with internal and external hexagons but with prosthetic connection through the external hexagon (Internal Torque, IT) in comparison with that of an implant system with external hexagon with mount (External Hexagon, EH). A device was made to measure the rotational freedom angles between implant and abutment hexagons in 10 implants from each group after the application of surgical placement torques of 45, 60 and 80 Ncm simulating implant locking. The distances between the vertices of the external hexagon were also obtained. Rotational freedom data were subjected to ANOVA and Tukey's test (P < .05) showing no significant difference between the angles of the intact implants (EH -3.31 ± 0.41° and IT -3.30 ± 0.17°) and after application of a 45 Ncm torque (EH -3.27 ± 0.38° and IT -3.31 ± 0.22°). However, after application of a 60 Ncm torque there were significant differences (IT -3.40 ± 0.20° and EH -4.03 ± 0.54°). After application of a 80 Ncm torque, the IT implant presented values of 3.39 ± 0.21° whereas the EH did not support the torque, suffering deformation of its external hexagon. Within the limits of this study, it can be concluded that the IT implant system may be preferable in clinical situations where implant placement within a certain bone density could generate torques higher than 60 Ncm.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In vitro integrity of implant external hexagon after application of surgical placement torque simulating implant locking

Davi¹,

Golin

Bernardes

et al. 2008

Braz. oral res.

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“…Both junctions require a dimensional freedom for an accurate, passive fit of the abutment to implant connection (4,11).…”

Section: Discussionmentioning

confidence: 99%

“…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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“…[1][2][3] Passive prosthesis fit is deemed important as the limited mobility of implants within bone 1-3 might lead, in the presence of prosthesis misfit, to unwanted level of strain at the bone-implant interface and between implant components, such as screw-joint connections. [1][2][3] Passive prosthesis fit is deemed important as the limited mobility of implants within bone 1-3 might lead, in the presence of prosthesis misfit, to unwanted level of strain at the bone-implant interface and between implant components, such as screw-joint connections.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Verification Jig on Framework Fit for Nonsegmented Fixed Implant‐Supported Complete Denture

Ercoli

Geminiani

Feng

et al. 2011

Clin Implant Dent Rel Res

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An Evaluation of Fit in Osseointegrated Implant Components Using Torque/Turn Analysis

Abstract: This study suggests that screw position can be an indicator of fit in dental implant prostheses if the end point of screw rotation is adequately indexed, specific to each assembly and screw.

Cited by 19 publications

References 8 publications

In vitro integrity of implant external hexagon after application of surgical placement torque simulating implant locking

In vitro integrity of implant external hexagon after application of surgical placement torque simulating implant locking

External Hexagon Deformation in Implants Subjected to Internal Torque

The Influence of Verification Jig on Framework Fit for Nonsegmented Fixed Implant‐Supported Complete Denture

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