Experimental research on the relationship between fit accuracy and fracture resistance of zirconia abutments

Sui, Xinxin; Wei, Huasha; Dashan, Wang; Han, Yijing; Deng, Jing; Wang, Yongliang; Wang, Junjun; Yang, Jianjun

doi:10.1016/j.jdent.2014.02.008

Cited by 22 publications

(17 citation statements)

References 14 publications

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“…Nowadays, zirconia abutments became the most commonly used in the esthetic zone due to its physical, mechanical and acceptable optical properties (Vagkopoulou, Koutayas, Koidis, & Strub, 2009). Several laboratory studies evaluated zirconia abutments for anterior teeth (Alqahtani & Flinton, 2014;Foong, Judge, Palamara, & Swain, 2013;Kerstein & Radke, 2008;Kim, Kim, Brewer, & Monaco, 2009;Sui et al, 2014). The reported fracture resistance ranged from 200 N to 831 N under static loading and from 104 N to 567 N after dynamic loading.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of posterior all‐ceramic hybrid‐abutment‐crowns versus hybrid‐abutments with separate crowns—A laboratory study

Nouh

Kern

Sabet

et al. 2018

Clinical Oral Implants Res

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Objective The purpose of this laboratory study was to evaluate the fatigue resistance, fracture resistance and mode of failure of posterior hybrid‐abutment‐crown vs. hybrid‐abutment with separate crown, both bonded to short titanium bases. Materials and Methods Thirty‐two titanium implants were embedded perpendicularly in auto‐polymerizing resin. Implant‐supported restorations simulating a maxillary first premolar were designed and milled using a CAD/CAM system and divided into 2 groups according to material (n = 16): zirconia (Z) and lithium disilicate (L). Each group was subdivided into two subgroups according to design (n = 8): hybrid‐abutment‐crown (ZS, LS) and hybrid‐abutment with separate crown (ZC, LC). Each group was subjected to 1.2 million cycles of thermo‐mechanical fatigue loading in a dual‐axis chewing simulator at 120 N load. Surviving specimens were subjected to quasi‐static loading in a universal testing machine. Mode of failure was determined under a low magnification optical microscope. Results During chewing simulation, 18.8% of zirconia and 43.8% of lithium disilicate restorations failed. The fracture resistance median values ranged from 3,730 N for group ZC, 3,400 N for group ZS, 1,295 N for group LS to 849 N for group LC. Group ZC had a statistically significant higher fracture resistance than groups LC and LS; however, it did not differ significantly from group ZS (p ≤ 0.05). Failures were seen in both titanium bases and ceramic superstructure. Conclusions Zirconia and lithium disilicate hybrid implant‐supported restorations with short (3 mm) titanium bases failed in a considerable number already during chewing simulation. Therefore, despite their high fracture strength the use in the posterior region should be considered critically.

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Section: Introductionmentioning

confidence: 99%

Mechanical behavior of posterior all‐ceramic hybrid‐abutment‐crowns versus hybrid‐abutments with separate crowns—A laboratory study

Nouh

Kern

Sabet

et al. 2018

Clinical Oral Implants Res

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“…7 Evidence has shown that fabrication tolerance, connection design, abutment material, and insertional torque can all affect the stability and integrity of the implant-abutment interface. Direct techniques such as scanning electron microscopy (SEM), 10 x-ray micro-computed tomography (micro-CT), 11 and synchroton radiography 12 capture 2D or 3D images of the gap directly. 9 The techniques employed for investigating the implant-abutment interface reported in the literature can be classified as direct and indirect ones.…”

mentioning

confidence: 99%

“…16 Good agreement between FE simulation and in vitro measurements of the size of micro-gaps has been reported. 10 Moreover, the process of micro-gap formation, its relationship with the applied load and how leakage is distributed inside the implant has not been studied in detail. Top views of the load adaptor showing the positions and directions (arrows) of the concentrated force applied for centric and eccentric loading (C) F I G U R E 2 In vitro test set up However, the reported micro-gap size varies considerably (from 0 to 135 μm), depending on the technique used.…”

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confidence: 99%

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Contact analysis of gap formation at dental implant‐abutment interface under oblique loading: A numerical‐experimental study

Fok

Aparicio

et al. 2019

Clin Implant Dent Rel Res

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Purpose: To develop numerical and experimental methods for investigating the formation of micro-gaps and the change in contact area at the implant-abutment interface of two different connector designs under oblique cyclic loading.Materials and Methods: Samples (n = 10 per group) of two-piece implant systems with the conical connection (group A) and the external hexagonal connection (group B) were subjected to cyclic loading with increasing load amplitudes up to 220 N.After loading, the samples were scanned using micro-CT, with silver nitrate as a highcontrast penetrant, and the level of leakage was assessed using a discrete scoring system. Three-dimensional finite element (FE) analyses of the two implant systems were also conducted to reveal the micro-gap formation process, especially bridging of the internal abutment screw space. The experimental and numerical results for the bridging load were then compared.Results: 90% of the samples in group A showed leakage into the internal implant space at a load of around 100 N; while over 80% of those in group B did so at a load of around 40 N. This agreed with the FE analysis, which showed bridging of the internal implant space at loads similar to those measured for the two implant systems.Residual gaps of less than 1.49 μm were predicted for group A only after unloading. Conclusions:The FE-predicted loads for bridging agreed well with those found experimentally for leakage to occur. The conical connection showed more resistance against formation of micro-gaps at the implant-abutment interface than the external hexagonal connection. Although the minimum load required to bridge the internal implant space was within the range of human biting force, the relation between bacterial invasion and micro-gaps needs further research. K E Y W O R D S finite element analysis, implant connection design, implant-abutment micro-gap, microcomputed tomography

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“…14 Decreasing the microgap size at the implant to abutment interface improved the fracture resistance of zirconia abutments in vitro, which may have been due to a subsequent reduction in micromotion. 14 Implant angulation is another factor that has affected the fracture resistance of zirconia in vitro. 15 For this study, abutments were custom milled from monolithic zirconia to restore implants placed at different apical positions or angles to the direction of occlusal force.…”

mentioning

confidence: 99%

Load to failure of different zirconia abutments for an internal hexagon implant

Yılmaz

Salaita²,

Seidt

et al. 2015

The Journal of Prosthetic Dentistry

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Experimental research on the relationship between fit accuracy and fracture resistance of zirconia abutments

Cited by 22 publications

References 14 publications

Mechanical behavior of posterior all‐ceramic hybrid‐abutment‐crowns versus hybrid‐abutments with separate crowns—A laboratory study

Mechanical behavior of posterior all‐ceramic hybrid‐abutment‐crowns versus hybrid‐abutments with separate crowns—A laboratory study

Contact analysis of gap formation at dental implant‐abutment interface under oblique loading: A numerical‐experimental study

Load to failure of different zirconia abutments for an internal hexagon implant

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