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  • Zi crowns and 3-unit...

Zi crowns and 3-unit PFDPs fabricated using the specific CAD-CAM system show good clinical outcomes

Written By : Dr. Shravani Dali |Medically Reviewed By : Dr. Kamal Kant Kohli Published On 2022-12-07T20:00:55+05:30  |  Updated On 8 Dec 2022 1:02 PM IST
Zi crowns and 3-unit PFDPs fabricated using the specific CAD-CAM system show good clinical outcomes
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Zi crowns and 3-unit PFDPs fabricated using the specific CAD-CAM system show good clinical outcomes according to a recent study published in the Journal of Dentistry.

The aim of this retrospective clinical study was to evaluate the survival and the occurrence of technical and biological complications in bi-layered zirconia-based (Zi) single crown and 3-unit fixed dental prostheses (FDPs). Also, the study aimed to analyze the effects of tooth vitality (vital versus non-vital), abutment location (anterior versus posterior), and luting cement (self-adhesive resin versus resin-reinforced glass ionomer) on clinical outcomes.

A total of 147 prostheses (in 94 patients) placed by undergraduate dental students in a university dental center during the period 2015–2021 were examined clinically using modified United States Public Health Service (USPHS) and California Dental Association (CDA) criteria. The mean duration of follow-up was 37 months (range, 6 - 63 months) for the single crowns (n = 77) and 25 months (range, 6 - 68 months) for the 3-unit FDPs (n = 70). Data were descriptively analyzed to determine the types and rates of complications based on USPHS and CDA criteria. The Kaplan-Meier survival estimation method was used to determine the cumulative survival and success rates of the prostheses (α=0.05). Differences in clinical outcomes (survival or failure) according to tooth vitality, luting cement, and location were statistically analyzed using cross-tabulations and Х2 test (α=0.05).

Results

  • The Kaplan-Meier cumulative survival rate was estimated as 96% for the Zi 3-unit FDPs after 5.5 years, and 90% for the Zi single crowns after 4.8 years.
  • The 5-year estimated success rate was 68% for both 3-unit FDPs and single crowns. Seven (9.1%) 77Zi single crowns and 70 2 (2.9%) Zi 3-unit FDPs were recorded as failures with occlusal roughness being the most commonly-observed complication (crowns: 4 [5.6%]; 3-unit FDPs: 8 [11.4%]).
  • In terms of clinical outcomes, statistically significant differences were found between all included vital and non-vital teeth (p = .006), and cement types (p = .028).
  • Taking single crowns alone, significant differences in clinical outcomes according to tooth vitality were noted (p = .036), but not for PFDPs.
  • The location of the prostheses did not produce any significant differences in the clinical outcomes, for both prostheses types independently or combined (p > .05).

The estimated cumulative survival rates in this study for single crowns and 3-unit Zi FDPs concurred with the ranges reported in systematic reviews. Zi-based prostheses on vital teeth produced better clinical outcomes than those placed on non-vital teeth, and type of luting cement influenced the final clinical outcome.

Reference:

Reem Alfadhli, Yara Alshammari, Mirza Rustum Baig, Ridwaan Omar. Clinical outcomes of single crown and 3-unit bi-layered zirconia-based fixed dental prostheses: An upto 6- year retrospective clinical study: Clinical outcomes of zirconia FDPs, Journal of Dentistry, Volume 127, 2022, 104321, ISSN 0300-5712. https://doi.org/10.1016/j.jdent.2022.104321.

Keywords:

Reem Alfadhli, Yara Alshammari, Mirza Rustum Baig, Ridwaan Omar, Clinical, outcomes, single, crown, 3-unit, bi-layered, zirconia-based, fixed, dental, prostheses, upto 6- year, retrospective, clinical study, Clinical, outcomes, zirconia, FDPs, Journal of Dentistry

ZirconiaCeramiccrownPartial fixed dental prosthesisSurvivalFailureComplicationsJournal of Dentistry
Source : Journal of Dentistry
Dr. Shravani Dali
Dr. Shravani Dali

    Dr. Shravani Dali has completed her BDS from Pravara institute of medical sciences, loni. Following which she extensively worked in the healthcare sector for 2+ years. She has been actively involved in writing blogs in field of health and wellness. Currently she is pursuing her Masters of public health-health administration from Tata institute of social sciences. She can be contacted at editorial@medicaldialogues.in.

    Dr. Kamal Kant Kohli
    Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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