The UCLA abutment: A four-year review

Lewis, S; Llamas, D; Avera, Sean P.

doi:10.1016/0022-3913(92)90082-l

Cited by 91 publications

(60 citation statements)

References 2 publications

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“…Because of the circular shape of the implant and its smaller diameter, when compared with the root of a natural tooth, a dilemma inevitably occurs of how to construct an artificial crown and abutment system that imitates the natural tooth form (Bichacho, 1998). In the past decades, many abutment designs, such as the UCLA abutment (Lewis et al, 1992) and the DIA anatomic abutment (Daftary, 1995), have been introduced in attempts to resolve the stated complications. However, problems of miscasting, inaccuracy fit and unfavorable antirotational capability cannot be avoided when using these abutments.…”

Section: Introductionmentioning

confidence: 99%

Design of a custom angled abutment for dental implants using computer-aided design and nonlinear finite element analysis

Liao

Dai

et al. 2010

Journal of Biomechanics

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Section: Introductionmentioning

confidence: 99%

Design of a custom angled abutment for dental implants using computer-aided design and nonlinear finite element analysis

Liao

Dai

et al. 2010

Journal of Biomechanics

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“…1,2 It causes inconvenience to the patient and practitioner, and can become financially onerous if it occurs frequently. [3][4][5] Jemt 1 stated that only 69.3% of prostheses had stable gold screws at the first postinsertion examination. Another study specifically examined the incidence of loose occlusal screws in a population of patients whose prostheses had been in use for at least 5 years and reported that 40% of slot-headed occlusal screws and 10% of screws with an internal hexagon were loose.…”

mentioning

confidence: 99%

“…23,24 Some researchers estimate that up to 10% of the initial preload may be lost due to surface imperfections in the first seconds after torque application. 13,21,25 The amount of preload present at the threads of a prosthetic retaining screw 4 depends on the applied torque, the presence and type of lubricant, the physical properties of the materials in contact, and settling of the screw after initial torquing. 26,27 Higher torque usually leads to greater preload values.…”

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confidence: 99%

Influence of Different Maintenance Times of Torque Application on the Removal Torque Values to Loosen the Prosthetic Abutment Screws of External Hexagon Implants

et al. 2013

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PURPOSE: To analyze the torque application on prosthetic abutment screws using different maintenance times, to determine an influence on the removal torque values. MATERIALS AND METH-ODS: A total of 40 external hexagon implants, 40 titanium screws, and 40 customized abutments were used. In group 1, the screws received a torque of 30 N·cm by instant torque application; in groups 2, 3, and 4, torque of 30 N·cm was applied and maintained for 10, 20, and 30 seconds, respectively. Removal torque was performed 10 minutes after torque application. Data were statistically analyzed using 1-way ANOVA and Tukey HSD test ( = 0.05). RESULTS: The mean and standard deviation (±SD) of removal torque values found were 11.61 ± 1.43 N·cm for group 1; 18.64 ± 1.71 N·cm for group 2; 21.62 ± 0.97 N·cm for group 3; and 21.48 ± 1.55 N·cm for group 4. Groups 3 and 4 exhibited statistically higher values than group 2, which demonstrated significantly higher values than group 1 (P < 0.05). CONCLU-SIONS: A torque of 30 N·cm applied for 20 seconds seemed to be the best option when considering the removal torque values of external hexagon implants. DOI: https://doi.org/10.1097/ID.0b013e31829e548dPosted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-89919 Accepted Version Originally published at: Sella, Gustavo Castellazzi; Lopes Pereira Neto, Armando Rodrigues; Maziero Volpato, Cláudia Angela; de Vasconcellos, Diego Klee; Pekkan, Gurel; Özcan, Mutlu (2013). Influence of different maintenance times of torque application on the removal torque values to loosen the prosthetic abutment screws of external hexagon implants. Implant Dentistry, 22 (5) ABSTRACT: (178 WORDS)Purpose: To analyze the torque application on prosthetic abutment screws using different maintenance times, to determine an influence on the removal torque values. Materials and Methods:A total of 40 external hexagon implants, 40 titanium screws and 40 customized abutments were used. In group 1, the screws received a torque of 30 Ncm by instant torque application; in groups 2, 3 and 4, torque of 30 Ncm was applied and maintained for 10, 20 and 30 seconds, respectively. Removal torque was performed 10 minutes after torque application.Data were statistically analyzed using one-way ANOVA and Tukey's HSD test (α = .05). Results:The mean and standard deviation (±SD) of removal torque values found were 11.61±1. The screw loosening may be related to several factors, including: screw tightening, quality of the prosthetic components, screw design, plastic deformation of contact surfaces and lack of passive fit. [10][11][12][13][14][15][16] To prevent this problem, a number of modifications have been used, including modification of the implant body abutment interface (external or internal hexagon or octagon), use of gold screws, torque-controlling devices, screw cements, and the use of a silicone obturator and washers between the prostheses and screws. 1,5,7,8,17,18 Also, centering the occlusal contact, flattening cuspal inclin...

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“…[1][2][3][4] Long-term evaluation of custom-milled abutments suggests that the real concern for the use of the UCLA abutment was not the fit of an individual casting to an implant, but rather the fit of an implant restoration to multiple implants. 5 Many factors may lead to prosthesis failure, such as an inaccurate impression or analog misplacement or a poor fit in the try-in session. 6 -13 Another difficulty with implant abutment is that the same abutment can be positioned in 6 or 12 different positions, depending on the connection design.…”

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confidence: 99%

Multiple Abutment Positional Guide

Carvalho

Ferreira²,

Barboza³

2009

Implant Dentistry

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Custom-made abutments are popular to correct malpositioned implants, enhance esthetics, and improve function. The implant abutment can be positioned in 6 or 12 different positions depending on the connection design. In addition, the number of positions increases exponentially when >1 abutment is to be placed. This report presents the fabrication and use of a multiple abutment positional guide. This device reduces the chair time for construction of implant-supported prostheses by seating the abutments within their correct locations.

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The UCLA abutment: A four-year review

Cited by 91 publications

References 2 publications

Design of a custom angled abutment for dental implants using computer-aided design and nonlinear finite element analysis

Design of a custom angled abutment for dental implants using computer-aided design and nonlinear finite element analysis

Influence of Different Maintenance Times of Torque Application on the Removal Torque Values to Loosen the Prosthetic Abutment Screws of External Hexagon Implants

Multiple Abutment Positional Guide

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