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Comparison of fracture strength and failure mode of different ceramic implant abutments.
J Prosthet Dent. 2017 Apr; 117(4):499-506.JP

Abstract

STATEMENT OF PROBLEM

The whitish color of zirconia (ZrO2) abutments offers favorable esthetics compared with the grayish color of titanium (Ti) abutments. Nonetheless, ZrO2 has greater opacity, making it difficult to achieve natural tooth color. Therefore, lithium disilicate (LaT) abutments have been suggested to replace metal abutments.

PURPOSE

The purpose of this in vitro study was to evaluate the fracture strength and failure mode of single-tooth implant restorations using ZrO2 and LaT abutments, and to compare them with titanium (Ti) abutments.

MATERIAL AND METHODS

Five different types of abutments, Ti; ZrO2 with no metal base; ZrO2 with a metal base (ZrT); LaT; and LaT combination abutment and crown (LcT) were assembled on 40 Ti implants and restored with LaT crowns. Specimens were subjected to quasistatic loading using a universal testing machine, until the implant-abutment connection failed. As bending of the metal would be considered a clinical failure, the values of force (N) at which the plastic deformation of the metal occurred were calculated, and the rate of deformation was analyzed. Statistical analysis was done using the Mann-Whitney U test (α=.05).

RESULTS

Group ZrO2 revealed the lowest resistance to failure with a mean of 202 ±33 N. Groups ZrT, LaT, and LaC withstood higher forces without fracture or debonding of the ceramic suprastructure, and failure was due to deformation of metal bases, with no statistically significant differences between these groups regarding the bending behavior.

CONCLUSIONS

Within the limitations of this in vitro study, it was concluded that LaT abutments have the potential to withstand the physiological occlusal forces that occur in the anterior region and that ZrO2 abutments combined with Ti inserts have much higher fracture strength than pure ZrO2 abutments.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Elsayed A
Assistant Professor, Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University at Kiel, Kiel, Germany. Electronic address: aelsayed@proth.uni-kiel.de.
Wille S
Research Associate, Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University at Kiel, Kiel, Germany.
Al-Akhali M
Research Associate, Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University at Kiel, Kiel, Germany.
Kern M
Professor and Chair, Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University at Kiel, Kiel, Germany.

MeSH

Dental AbutmentsDental Implant-Abutment DesignDental PorcelainDental Restoration FailureDental Stress AnalysisHumansTitaniumZirconium

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

27769518

Citation

Elsayed, Adham, et al. "Comparison of Fracture Strength and Failure Mode of Different Ceramic Implant Abutments." The Journal of Prosthetic Dentistry, vol. 117, no. 4, 2017, pp. 499-506.
Elsayed A, Wille S, Al-Akhali M, et al. Comparison of fracture strength and failure mode of different ceramic implant abutments. J Prosthet Dent. 2017;117(4):499-506.
Elsayed, A., Wille, S., Al-Akhali, M., & Kern, M. (2017). Comparison of fracture strength and failure mode of different ceramic implant abutments. The Journal of Prosthetic Dentistry, 117(4), 499-506. https://doi.org/10.1016/j.prosdent.2016.06.018
Elsayed A, et al. Comparison of Fracture Strength and Failure Mode of Different Ceramic Implant Abutments. J Prosthet Dent. 2017;117(4):499-506. PubMed PMID: 27769518.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Comparison of fracture strength and failure mode of different ceramic implant abutments. AU - Elsayed,Adham, AU - Wille,Sebastian, AU - Al-Akhali,Majed, AU - Kern,Matthias, Y1 - 2016/10/18/ PY - 2015/12/23/received PY - 2016/06/22/revised PY - 2016/06/22/accepted PY - 2016/10/23/pubmed PY - 2018/3/1/medline PY - 2016/10/23/entrez SP - 499 EP - 506 JF - The Journal of prosthetic dentistry JO - J Prosthet Dent VL - 117 IS - 4 N2 - STATEMENT OF PROBLEM: The whitish color of zirconia (ZrO2) abutments offers favorable esthetics compared with the grayish color of titanium (Ti) abutments. Nonetheless, ZrO2 has greater opacity, making it difficult to achieve natural tooth color. Therefore, lithium disilicate (LaT) abutments have been suggested to replace metal abutments. PURPOSE: The purpose of this in vitro study was to evaluate the fracture strength and failure mode of single-tooth implant restorations using ZrO2 and LaT abutments, and to compare them with titanium (Ti) abutments. MATERIAL AND METHODS: Five different types of abutments, Ti; ZrO2 with no metal base; ZrO2 with a metal base (ZrT); LaT; and LaT combination abutment and crown (LcT) were assembled on 40 Ti implants and restored with LaT crowns. Specimens were subjected to quasistatic loading using a universal testing machine, until the implant-abutment connection failed. As bending of the metal would be considered a clinical failure, the values of force (N) at which the plastic deformation of the metal occurred were calculated, and the rate of deformation was analyzed. Statistical analysis was done using the Mann-Whitney U test (α=.05). RESULTS: Group ZrO2 revealed the lowest resistance to failure with a mean of 202 ±33 N. Groups ZrT, LaT, and LaC withstood higher forces without fracture or debonding of the ceramic suprastructure, and failure was due to deformation of metal bases, with no statistically significant differences between these groups regarding the bending behavior. CONCLUSIONS: Within the limitations of this in vitro study, it was concluded that LaT abutments have the potential to withstand the physiological occlusal forces that occur in the anterior region and that ZrO2 abutments combined with Ti inserts have much higher fracture strength than pure ZrO2 abutments. SN - 1097-6841 UR - https://www.unboundmedicine.com/medline/citation/27769518/Comparison_of_fracture_strength_and_failure_mode_of_different_ceramic_implant_abutments_ DB - PRIME DP - Unbound Medicine ER -