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Mechanical stability of fully personalized, abutment-free zirconia implant crowns on a novel implant-crown interface.
J Dent. 2022 06; 121:104121.JD

Abstract

OBJECTIVES

To test the failure load and failure mode of a novel implant-crown interface specifically designed for the fabrication of fully personalized, abutment-free monolithic zirconia CAD-CAM crowns compared to conventional implant-abutment interfaces involving prefabricated or centrally manufactured abutments for zirconia CAD-CAM crowns.

METHODS

Implants (N=48) were divided into groups (n=12) according to different implant-abutment interface designs: (1) internal implant connection with personalized, abutment-free CAD-CAM crowns (Abut-Free-Zr), (2) internal conical connection with customized, centrally manufactured zirconia CAD-CAM abutments (Cen-Abut-Zr), (3) prefabricated titanium base abutments from manufacturer 1 (Ti-Base-1), (4) additional prefabricated titanium base abutments from manufacturer 2 (Ti-Base-2). All specimens were restored with a screw-retained monolithic zirconia CAD-CAM molar crown and subjected to thermomechanical aging (1.200.000 cycles, 49 N, 1.67 Hz, 30° angulation, thermocycling 5-50°C). Static load until failure was applied in a universal testing machine. Failure modes were analyzed descriptively under digital microscope. Mean failure load values were statistically analyzed at a significance level of p<0.05.

RESULTS

All specimens survived thermomechanical aging. The mean failure loads varied between 1332 N (Abut-Free-Zr) and 1601 N (Ti-Base-2), difference being significant between these groups (p<0.05). No differences between the other groups were seen. The predominant failure mode per group was crown fracture above implant connection (Abut-Free-Zr, 75%), abutment fracture below implant neck (Cen-Abut-Zr, 83%), crown fracture leaving an intact abutment (Ti-Base-1/Ti-Base-2 100%).

CONCLUSIONS

Implant-crown interface with fully personalized, abutment-free monolithic CAD-CAM zirconia crowns exhibited similar failure loads as conventional implant-abutment interfaces (except group Ti-Base-2) involving CAD-CAM crowns with prefabricated or centrally manufactured abutment.

CLINICAL SIGNIFICANCE

The new implant connection simplifies the digital workflow for all-ceramic implant reconstructions. The specific design of the implant-crown interface allows the fabrication of fully personalized, abutment-free zirconia implant crowns both in-house and in-laboratory without the need of a prefabricated abutment or central manufacturing.

Links

Publisher Full Text (DOI)

Authors+Show Affiliations

Hjerppe J
Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, CH-8032 Zurich, Switzerland. Electronic address: jenni.hjerppe@zzm.uzh.ch.
Jung RE
Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, CH-8032 Zurich, Switzerland.
Hämmerle CH
Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, CH-8032 Zurich, Switzerland.
Özcan M
Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, CH-8032 Zurich, Switzerland.
Mühlemann S
Clinic of Reconstructive Dentistry, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, CH-8032 Zurich, Switzerland.

MeSH

Computer-Aided DesignCrownsDental AbutmentsDental Implant-Abutment DesignDental Restoration FailureDental Stress AnalysisMaterials TestingTitaniumZirconium

Pub Type(s)

Journal Article

Language

eng

PubMed ID

35395344

Citation

Hjerppe, Jenni, et al. "Mechanical Stability of Fully Personalized, Abutment-free Zirconia Implant Crowns On a Novel Implant-crown Interface." Journal of Dentistry, vol. 121, 2022, p. 104121.
Hjerppe J, Jung RE, Hämmerle CH, et al. Mechanical stability of fully personalized, abutment-free zirconia implant crowns on a novel implant-crown interface. J Dent. 2022;121:104121.
Hjerppe, J., Jung, R. E., Hämmerle, C. H., Özcan, M., & Mühlemann, S. (2022). Mechanical stability of fully personalized, abutment-free zirconia implant crowns on a novel implant-crown interface. Journal of Dentistry, 121, 104121. https://doi.org/10.1016/j.jdent.2022.104121
Hjerppe J, et al. Mechanical Stability of Fully Personalized, Abutment-free Zirconia Implant Crowns On a Novel Implant-crown Interface. J Dent. 2022;121:104121. PubMed PMID: 35395344.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mechanical stability of fully personalized, abutment-free zirconia implant crowns on a novel implant-crown interface. AU - Hjerppe,Jenni, AU - Jung,Ronald E, AU - Hämmerle,Christoph Hf, AU - Özcan,Mutlu, AU - Mühlemann,Sven, Y1 - 2022/04/05/ PY - 2021/09/09/received PY - 2022/03/24/revised PY - 2022/04/03/accepted PY - 2022/4/9/pubmed PY - 2022/5/26/medline PY - 2022/4/8/entrez KW - CAD-CAM KW - Crown KW - Dental implants KW - Monolithic KW - Personalized KW - Prosthodontics KW - Zirconia SP - 104121 EP - 104121 JF - Journal of dentistry JO - J Dent VL - 121 N2 - OBJECTIVES: To test the failure load and failure mode of a novel implant-crown interface specifically designed for the fabrication of fully personalized, abutment-free monolithic zirconia CAD-CAM crowns compared to conventional implant-abutment interfaces involving prefabricated or centrally manufactured abutments for zirconia CAD-CAM crowns. METHODS: Implants (N=48) were divided into groups (n=12) according to different implant-abutment interface designs: (1) internal implant connection with personalized, abutment-free CAD-CAM crowns (Abut-Free-Zr), (2) internal conical connection with customized, centrally manufactured zirconia CAD-CAM abutments (Cen-Abut-Zr), (3) prefabricated titanium base abutments from manufacturer 1 (Ti-Base-1), (4) additional prefabricated titanium base abutments from manufacturer 2 (Ti-Base-2). All specimens were restored with a screw-retained monolithic zirconia CAD-CAM molar crown and subjected to thermomechanical aging (1.200.000 cycles, 49 N, 1.67 Hz, 30° angulation, thermocycling 5-50°C). Static load until failure was applied in a universal testing machine. Failure modes were analyzed descriptively under digital microscope. Mean failure load values were statistically analyzed at a significance level of p<0.05. RESULTS: All specimens survived thermomechanical aging. The mean failure loads varied between 1332 N (Abut-Free-Zr) and 1601 N (Ti-Base-2), difference being significant between these groups (p<0.05). No differences between the other groups were seen. The predominant failure mode per group was crown fracture above implant connection (Abut-Free-Zr, 75%), abutment fracture below implant neck (Cen-Abut-Zr, 83%), crown fracture leaving an intact abutment (Ti-Base-1/Ti-Base-2 100%). CONCLUSIONS: Implant-crown interface with fully personalized, abutment-free monolithic CAD-CAM zirconia crowns exhibited similar failure loads as conventional implant-abutment interfaces (except group Ti-Base-2) involving CAD-CAM crowns with prefabricated or centrally manufactured abutment. CLINICAL SIGNIFICANCE: The new implant connection simplifies the digital workflow for all-ceramic implant reconstructions. The specific design of the implant-crown interface allows the fabrication of fully personalized, abutment-free zirconia implant crowns both in-house and in-laboratory without the need of a prefabricated abutment or central manufacturing. SN - 1879-176X UR - https://www.unboundmedicine.com/medline/citation/35395344/Mechanical_stability_of_fully_personalized_abutment_free_zirconia_implant_crowns_on_a_novel_implant_crown_interface_ DB - PRIME DP - Unbound Medicine ER -