Preload and torque removal evaluation of three different abutment screws for single standing implant restorations

Stüker, Rafael Augusto; Teixeira, Eduardo Rolim; Beck, João Carlos Pinheiro; Costa, Nilza Pereira da

doi:10.1590/s1678-77572008000100011

Cited by 74 publications

(76 citation statements)

References 5 publications

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“…Then, in addition to surface roughness, secondary factors such as the material, screw head, and thread design also have to be taken into consideration [5][6][7][8] . Furthermore, several other factors can exert a major influence on screw loosening, such as the structural design of the implant connection, a poor fit with an implant-supported prosthetic crown, and occlusal loading [9][10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

Influence of eccentric cyclic loading on implant components: Comparison between external joint system and internal joint system

Sakamoto

Homma

Takanashi

et al. 2016

Dental Materials Journal

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The purpose of this in vitro study was to investigate the influence of eccentric loading on implant components by measuring screw loosening and observing these components under several load positions and magnitudes. The external and internal joint system implants with butt joint connection were subjected to cyclic loading tests according to the specifications of ISO 14801. Load position was set at 0, 4, or 8 mm, and load was set at 100 or 300 N. On the external joint system, the reverse torque values decreased with distal shift in the loading position and an increase in magnitude of load, and abrasion and deformation on the anti-rotation device were observed. On the internal joint system, no large decrease in reverse torque was observed even though increasing the load position and load, however, abrasion and deformation on the anti-rotation device as well as fracture at implant/abutment connection were observed.

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Section: Introductionmentioning

confidence: 99%

Influence of eccentric cyclic loading on implant components: Comparison between external joint system and internal joint system

Sakamoto

Homma

Takanashi

et al. 2016

Dental Materials Journal

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“…This result suggests that the roughness caused by surface treatment increases the friction between the implant surface and bone, influencing primary stability. 9,18,19 Moreover, when the surface treatment increased bone-implant contact, the likelihood of osseointegration increased. 11 However, the high pullout resistance of implants with treated surfaces compared with those having machined surfaces suggests that the surface influences initial stability even when osseointegration does not occur.…”

Section: Discussionmentioning

confidence: 99%

“…17 In these tests, it was observed that the implants with treated surfaces behaved differently than the machined implants. 18,19 This study aimed to evaluate the insertion torque and the pullout resistance of titanium dental implants with treated and untreated surfaces before osseointegration, and to evaluate the effects of these treatments on primary stability.…”

Section: Introductionmentioning

confidence: 99%

In vitro analysis of the influence of surface treatment of dental implants on primary stability

et al. 2012

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In vitro analysis of the influence of surface treatment of dental implants on primary stability Abstract: Surface treatment interferes with the primary stability of dental implants because it promotes a chemical and micromorphological change on the surface and thus stimulates osseointegration. This study aimed to evaluate the effects of different surface treatments on primary stability by analyzing insertion torque (IT) and pullout force (PF). Eight samples of implants with different surface treatments (TS -external hexagon with acid surface treatment; and MS -external hexagon, machined surface), all 3.75 mm in diameter × 11.5 mm in length, were inserted into segments of artificial bones. The IT of each sample was measured by an electronic torquemeter, and then the pullout test was done with a universal testing machine. The results were subjected to ANOVA (p < 0.05), followed by Tukey's test (p < 0.05). The IT results showed no statistically significant difference, since the sizes of the implants used were very similar, and the bone used was not highly resistant. The PF values (N) were, respectively, TS = 403.75 ± 189.80 and MS = 276.38 ± 110.05. The implants were shown to be different in terms of the variables of maximum force (F = 4.401, p = 0.0120), elasticity in maximum flexion (F = 3.672, p = 0.024), and relative stiffness (F = 4.60, p = 0.01). In this study, external hexagonal implants with acid surface treatment showed the highest values of pullout strength and better stability, which provide greater indication for their use.

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“…9 It might lead to a component failure that demanded a more extensive repair. 10,11 There are several factors that can play critical roles in screw joint stability, including the preload and screw geometry. Screw joint preloading, an important mechanical factor in preventing screw loosening, accumulated in the abutment screw as a product of screw tightening.…”

mentioning

confidence: 99%

Removal torque of a two-piece zirconia abutment with a novel titanium component in an internal connection implant system after dynamic cyclic loading

Lee

2017

J Korean Acad Prosthodont

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IntroductionVarious ceramic materials have been replacing metals in prosthetic fields, including crowns, fixed partial dentures and implant restorations, because of their biocompatibility and optical qualities. When these ceramics were used, the soft tissue appeared more similar to the natural color and the bluish appearance of cervical soft tissues as encountered with metal restorations would be avoided.1 As the esthetic demands of dental patients increase, attempts to use zirconia materials for fabricating monolithic crowns in the posterior region have been widely accepted because of their mechanical properties and biocompatibility. However, when selecting implant abutments for the posterior region, zirconia abutments were not preferred over titanium abutments. 2-4 When using internal connection zirconia abutments, the implant-abutment connection area was vulnerable to cracking or fracture. 5 The development of various zirconia Purpose: The aim of this study was to evaluate screw removal torque of the two-piece zirconia abutment with the novel titanium component compared to the conventional onepiece titanium abutment in the internal connection implant before and after dynamic cyclic loading. Materials and methods: Two types of the abutment assemblies with internal connection were prepared and divided into the groups; titanium abutment-titanium abutment screw assemblies as control, and zirconia abutment-titanium socket-titanium abutment screw assemblies as experimental group. A total of 12 abutments and implants were used of six assemblies each group. Each assembly was tightened to 30 Ncm. A cyclic load of 300 N at an angle of 30 degrees in reference to the loading axis was applied until one million cycles or failure. The removal torque values (RTVs) of the abutment screws were measured with a digital torque gauge before and after cyclic loading. The RTVs of the pre load and post load were analyzed with t-test, and P-values < .05 were considered statistically significant. Results: The assemblies of both groups survived all after the dynamic cyclic loading test without screw loosening. The statistically significant differences were found between the mean RTVs before and after the cyclic loading in both groups (P < .05). The RTV differences for the control and the experimental group were -7.25 ± 1.50 Ncm and -7.33 ± 0.93 Ncm, respectively. Statistical analysis revealed that the RTV differences in both groups were not significantly different from each other (P > .05). Conclusion: Within the limitation of this study, the two-piece zirconia abutment with the titanium component did not show a significant RTV difference of the abutment screw compared to the titanium abutment after dynamic cyclic loading. (J Korean Acad Prosthodont 2017;55:151-5)

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Preload and torque removal evaluation of three different abutment screws for single standing implant restorations

Cited by 74 publications

References 5 publications

Influence of eccentric cyclic loading on implant components: Comparison between external joint system and internal joint system

Influence of eccentric cyclic loading on implant components: Comparison between external joint system and internal joint system

In vitro analysis of the influence of surface treatment of dental implants on primary stability

Removal torque of a two-piece zirconia abutment with a novel titanium component in an internal connection implant system after dynamic cyclic loading

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