The fit of cast and premachined implant abutments

Byrne, David; Houston, Frank; Cleary, Richard; Claffey, Noel

doi:10.1016/s0022-3913(98)70108-8

Cited by 142 publications

(165 citation statements)

References 11 publications

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“…This finding can be attributed to the use of 5-element arch-shaped frameworks, one-piece casting process (17) and the inherent variations of the burn and casting processes (9) applied in the frameworks of present study.…”

Section: Discussionmentioning

confidence: 68%

“…Some studies have reported that frameworks cast in one piece present distortions that compromise their accurate fit to the implant/abutment interface (3,17). This also occurs when using UCLA castable abutments (9). In the present study, one-piece cast associated to UCLA castable abutments is justified because this set induces the occurrence of misfits for analysis.…”

Section: Discussionmentioning

confidence: 83%

“…In the present study, a great torque loss was observed, some times reaching 70% of torque loss. Such fact could be explained by Byrne et al (9) study, which evaluated the fit of pre-machined, castable and pre-machined changed in laboratory abutments at the implant/abutment interface and between the seating of the inferior screw head and the abutment base. These authors observed better fit and larger number of contacts between the implant platform and abutment in the pre-machined and pre-machined changed in laboratory abutments compared to the castable abutments.…”

Section: Discussionmentioning

confidence: 99%

“…The contact between abutment and implant platform is a key factor because it reduces the load over the abutment screw, warranting a high efficiency of these components (9). Even little misfit could result in changes in screw geometry and incidence of strain over the screws (10).…”

Section: Introductionmentioning

confidence: 99%

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Relation between implant/abutment vertical misfit and torque loss of abutment screws

et al. 2008

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This study investigated whether there is a direct correlation between the level of vertical misfit at the abutment/implant interface and torque losses (detorque) in abutment screws. A work model was obtained from a metal matrix with five 3.75 x 9 mm external hex implants with standard platform (4.1 mm). Four frameworks were waxed using UCLA type abutments and one-piece cast in commercially pure titanium. The misfit was analyzed with a comparator microscope after 20 Ncm torque. The highest value of misfit observed per abutment was used. The torque required to loose the screw was evaluated using a digital torque meter. The torque loss values, measured by the torque meter, were assumed as percentage of initial torque (100%) given to abutment screws. Pearson's correlation (=0.05) between the misfit values (29.08 ± 8.78 µm) and the percentage of detorque (50.71 ± 11.37%) showed no statistically significant correlation (p=0.295). Within the limitations of this study, it may be concluded that great vertical misfits dot not necessarily implies in higher detorque values.

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Section: Discussionmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Relation between implant/abutment vertical misfit and torque loss of abutment screws

et al. 2008

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“…Mechanical failures include screw loosening that is the most common reported complication, especially in single units in premolar and molar areas (Ref 3). Because external loads always amplify dynamic changes in screw joints, misfits and pre-existing deformation within the components will further enhance screw loosening (Ref 4,5). The level of static stresses caused by misfit depends on size, shape, and location of gaps; interabutment distance; and shape, dimensions, and stiffness of the metal of components.…”

Section: Introductionmentioning

confidence: 99%

Effect of Misfit on Preload Maintenance of Retention Screws of Implant-Supported Prostheses

Assunção

Santos

Délben

et al. 2009

J. of Materi Eng and Perform

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The aim of this study was to evaluate the effect of unilateral misfit at different levels on a crown-implantretention screw system of implant-supported crowns. Hexagon castable UCLA abutments were cast in Co-Cr alloy to fabricate 48 metallic crowns divided into four groups (n = 12). Group A: crowns did not present misfit; Groups B, C and D: crowns were fabricated with unilateral misfit of 50, 100, and 200 lm, respectively. The crowns were attached by titanium retention screw with 30 N/cm to external hexagonal osseointegrated implants embedded in acrylic resin. After 2 min, the retention screw of each replica was submitted to detorque evaluation by an analogic torque gauge. Three retention screws were used to perform detorque evaluation at each replica and the procedure was repeated twice with each screw. Each group was submitted to 72 detorque measurements. Data were evaluated by ANOVA and Tukey test (P < 0.05). All groups exhibited significant decrease (P < 0.05) in preload and the lowest decrease occurred in Group A. Groups B, C, and D were statistically significant different from Group A (P < 0.05), but there was no statistically significant difference between Groups B and D (P > 0.05). Crowns with unilateral misfit presented higher preload decrease than crowns completely fitted to osseointegrated implants.

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Prefabricated Implant Abutments

Binon

2014

Clinical and Laboratory Manual of Dental Implant Abutments

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The fit of cast and premachined implant abutments

Cited by 142 publications

References 11 publications

Relation between implant/abutment vertical misfit and torque loss of abutment screws

Relation between implant/abutment vertical misfit and torque loss of abutment screws

Effect of Misfit on Preload Maintenance of Retention Screws of Implant-Supported Prostheses

Prefabricated Implant Abutments

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