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Clinical performance of tooth- or implant-supported veneered zirconia single crowns: 42-month results

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Abstract

Objectives

The objective of this clinical study was to compare and assess the clinical performance of tooth-supported and implant-supported zirconia single crowns with sintered veneering caps.

Methods

In this prospective study, 118 patients with a total of 220 single crowns placed on 106 teeth (69 vital teeth, 37 endodontically treated teeth) and 114 implants in molar and premolar regions were examined during a mean observation period of 42 months. The restorations were evaluated for technical failures such as veneering porcelain fractures (chipping), surface quality, marginal fit, and the interface quality of the coping and sintered veneering. The soft tissue status was assessed using the modified Silness and Löe’s plaque and gingival index (mPI) and the modified Muhlemann sulcus bleeding index (mSBI). Tooth-supported crowns were checked for secondary caries and hypersensitivity during the follow-up period. Recalls were performed every 6 months.

Results

The 3-year Kaplan-Meier success probability was 98.2% and 100% for implant- and tooth-supported crowns, respectively. A significant difference could be detected between the implant-supported and tooth-supported zirconia single crowns, in terms of their chipping rate (p = 0.039). Veneering material fractures were recorded on two implant-supported restorations (1.8%). No veneering fractures occurred on tooth-supported single crowns. The plaque and gingival index and sulcus bleeding index showed stable and healthy soft peri-implant and periodontal tissues. Neither loss of vitality nor secondary caries occurred on tooth-supported crowns.

Conclusions

Zirconia-based single crowns with a sintered veneering cap showed promising clinical results on both tooth and implant abutments; however, the dental implants were more prone to complications. In terms of clinical significance, high-strength ceramic with a sintered veneering cap can be recommended for prosthetic treatment of both tooth- and implant-supported single crowns in molar regions.

Clinical relevance

This study provides valuable information for further application of all-ceramic restorations.

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Author information

Authors and Affiliations

  1. Private Dental Office, Weinstraße 4, 80333, Munich, Germany

    Friederike Cantner, Claudio Cacaci & Peter Randelzhofer

  2. Department of Oral and Maxillofacial Surgery, St. Josefshospital, Kurfürstenstr. 69, 47829, Krefeld-Uerdingen, Germany

    Thomas Mücke

  3. Private Dental Office, Briennerstrße 7, 80333, Munich, Germany

    Jan Hajtó

  4. Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, University Charité Berlin, Assmannshauser Strasse 4-6, 14197, Berlin, Germany

    Florian Beuer

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  1. Friederike Cantner
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Correspondence to Florian Beuer.

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The authors declare they have no competing interests.

Ethical approval

The requirements of the Helsinki Declaration were observed and the patients given informed consent. The ethical board of the Munich University (number 434/24) has reviewed and approved the study design.

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Informed consent was obtained from all individual participants included in this study.

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Cantner, F., Cacaci, C., Mücke, T. et al. Clinical performance of tooth- or implant-supported veneered zirconia single crowns: 42-month results. Clin Oral Invest 23, 4301–4309 (2019). https://doi.org/10.1007/s00784-019-02878-0

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