Analysis of Dimensional Changes in the Screw and the Surface Topography at the Interface of a Titanium Screw and a Zirconia Abutment Under Cyclic Loading: An In Vitro Study

Dhingra, Ajay; Weiner, Saul; Luke, Allyn; Ricci, John L.

doi:10.11607/jomi.2370

Cited by 14 publications

(24 citation statements)

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“…Zirconia has higher flexural strength and lower modulus of elasticity than alumina, making it a better choice for manufacturing porcelain abutments. According to Dhingra et al, the torque loss of the zirconia abutment was higher than that of the titanium abutment after cyclic loading. However, there was no significant difference.…”

Section: The Factors Contributed To Abutment Screw Looseningmentioning

confidence: 76%

“…According to Dhingra et al, 32 the torque loss of the zirconia abutment was higher than that of the titanium abutment after cyclic loading. However, there was no significant difference.…”

Section: The Geometrical Morphology Materials Used and Manufacturimentioning

confidence: 90%

“…The screw acts like a tensioned spring, and the clamping force it induces between the implant and the abutment holds the two parts together. The preload determines the clamping force to a large extent and is a crucial factor in the stability of the implant‐abutment connection …”

Section: The Mechanism Of the Abutment Screw Looseningmentioning

confidence: 99%

“…The preload determines the clamping force to a large extent and is a crucial factor in the stability of the implant-abutment connection. 24,[30][31][32][33] Bickford 34 divided the process of screw loosening into two stages.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of and factors associated with the loosening of the implant abutment screw: A review

Huang

Wang

2019

J Esthet Restor Dent

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Objective While the loosening of the abutment screw is one of the most common complications in implant‐supported restorations, there is a lack of comprehensive literatures for mechanism of and factors associated with the loosening of the implant abutment screw. The review was to summarize the mechanism of and factors associated with the loosening of the implant abutment screw. Overview A total of 99 relevant articles were included in the literature review. The mechanism of the abutment screw loosening was explained. The factors contributed to abutment screw loosening were divided into five aspects and then expounded respectively. Conclusions The internal connection and abutments with anti‐rotational and conical designs have better resistance to screw loosening. Cantilevers increase the risk of screw loosening. The effect of surface treatment of the abutment screw is unsure. Clinicians need to tighten the abutment screw to the recommended torque while avoiding repeated tightening and loosening, and increase the frequency of follow‐ups to retighten the loosened screws in time. Clinical Significance While the loosening of the abutment screw is one of the most common complications in implant‐supported restorations, there is a lack of comprehensive literatures for mechanism of and factors associated with the loosening of the implant abutment screw. The review was to summarize the mechanism of and factors associated with the loosening of the implant abutment screw, so that clinicians may make better choices in clinical practice.

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Section: The Factors Contributed To Abutment Screw Looseningmentioning

confidence: 76%

“…According to Dhingra et al, 32 the torque loss of the zirconia abutment was higher than that of the titanium abutment after cyclic loading. However, there was no significant difference.…”

Section: The Geometrical Morphology Materials Used and Manufacturimentioning

confidence: 90%

Section: The Mechanism Of the Abutment Screw Looseningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanism of and factors associated with the loosening of the implant abutment screw: A review

Huang

Wang

2019

J Esthet Restor Dent

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“…Screw joint preloading, an important mechanical factor in preventing screw loosening, accumulated in the abutment screw as a product of screw tightening. 12 When the preload falls below a critical level, joint stability may be compromised, and the screw joint may fail. 13,14 Because of the unique dual hex design connecting both the implant fixture and the zirconia abutment, screw loosening is of utmost importance in abutment and prosthetic survival.…”

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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Solid meshing of 3D geological model in finite element analysis: a case study of East Azerbaijan, NW Iran

Farshbaf

Khatib

Nazari

2015

Model. Earth Syst. Environ.

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The aim of this research is ideal solid meshing of a 3D geological body including topography for studies of finite element analysis. In many numerical analyses, solid meshing is abstruse and consumes much time and high CPU usage. This complexity increases with variety of shapes geometry and height heterogeneity of a surface. In geology, this issue is important and usually results to the removing topography. For this order, we try to mesh the topographic surface and create a shell block diagram in which top side is topographic surface. By having mesh spacing from topography, we defined shape functions of linear quadrilateral meshes for shell block. The sweep mesh applying in analytical software makes the block diagram ready for defining solid meshes. Since topographic loading and static analysis closely relate to each other, linear tetrahedron meshes are suitable for static analysis. In this way, with a minimum number of nodes, solid meshing is possible and for sensitive areas, there is enough space to regenerate finer meshes. Therefore, following the procedure of shape function definitions from linear plane to solid elements, we can idealize solid meshing for numerical analysis.

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Analysis of Dimensional Changes in the Screw and the Surface Topography at the Interface of a Titanium Screw and a Zirconia Abutment Under Cyclic Loading: An In Vitro Study

Cited by 14 publications

References 0 publications

Mechanism of and factors associated with the loosening of the implant abutment screw: A review

Mechanism of and factors associated with the loosening of the implant abutment screw: A review

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

Solid meshing of 3D geological model in finite element analysis: a case study of East Azerbaijan, NW Iran

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