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International Journal of Implant Dentistry
Published in: International Journal of Implant Dentistry 1/2020

Open Access 01-12-2020 | Research

Hybrid-abutment-restoration: effect of material type on torque maintenance and fracture resistance after thermal aging

Authors: Walid Al-Zordk, Ahmed Elmisery, Mohamed Ghazy

Published in: International Journal of Implant Dentistry | Issue 1/2020

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Abstract

Purpose

To evaluate the tightening torque maintenance with zirconia, lithium disilicate, and polyetheretherketone (PEEK) hybrid-abutment-crowns after thermal aging, in addition to assess the fracture resistance of hybrid-abutment-crowns fabricated with different materials.

Materials and methods

Thirty implants were restored with identical hybrid-abutment-crowns, resembling the maxillary first premolar, fabricated from zirconia (Zr), lithium disilicate (L2), or ceramic-reinforced PEEK (PE). The three groups (n = 10) were constructed utilizing a Ti-base. After bonding, each restoration was secured in its respective implant with a torque of 25 Ncm. All restorations were subjected to thermal aging for 7000 cycles. The loosening torque was assessed utilizing the digital torque meter. Each restoration was subjected to fracture testing and the mode of failure was determined.

Results

Zr group displayed the highest mean torque loss value (2.70 ± 0.59 Ncm) with the mean loosening torque value of 22.38 ± 0.68 Ncm. PE group displayed the lowest mean torque loss (2.55 ± 0.50 Ncm) with mean loosening torque value of 22.61 ± 0.59 Ncm. There was no significant difference between study groups regarding loosening torque (p = 0.68), torque loss (p = 0.80), and percentage of torque loss (p = 0.79). There was significant difference regarding the mean fracture load value between Zr and PE groups. However, there was no significant difference (p = 0.05) regarding mean fracture load value between L2 and PE groups.

Conclusion

The hybrid-abutment-crown material does not affect the torque maintenance after thermal aging. Based on fracture load, zirconia hybrid-abutment-crown can be used, while lithium disilicate and PEEK hybrid-abutment-crowns may cautiously serve in premolar region.
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Metadata
Title
Hybrid-abutment-restoration: effect of material type on torque maintenance and fracture resistance after thermal aging
Authors
Walid Al-Zordk
Ahmed Elmisery
Mohamed Ghazy
Publication date
01-12-2020
Publisher
Springer Berlin Heidelberg
Published in
International Journal of Implant Dentistry / Issue 1/2020
Electronic ISSN: 2198-4034
DOI
https://doi.org/10.1186/s40729-020-00220-y

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