Clinical evaluation of posterior zirconia-based and porcelain-fused-to-metal crowns with a vertical preparation technique: an up to 5-year retrospective cohort study.

Publisher: Elsevier Country of Publication: England NLM ID: 0354422 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-176X (Electronic) Linking ISSN: 03005712 NLM ISO Abbreviation: J Dent Subsets: MEDLINE

Publication: Kidlington : Elsevier
Original Publication: Bristol, Eng., Wright.

Zirconium*/chemistry ; Crowns* ; Periodontal Index* ; Tooth Preparation, Prosthodontic*/methods; Humans ; Retrospective Studies ; Male ; Female ; Middle Aged ; Adult ; Dental Porcelain/chemistry ; Metal Ceramic Alloys/chemistry ; Dental Plaque Index ; Dental Abutments ; Treatment Outcome ; Dental Prosthesis Design ; Cohort Studies ; Dental Restoration Failure ; Aged ; Follow-Up Studies

Objective: To evaluate the clinical conditions of single-unit posterior restorations on teeth prepared without finishing line, after 5.6 years of clinical service.
Materials and Methods: 50 crowns (25 zirconia-based (Zr) and 25 porcelain-fused-to-metal (PFM)) were selected from 34 patients. The restorations were evaluated according to the California Dental Association (CDA) Quality Criteria, and periodontal variables were studied in the abutment teeth compared with the unrestored contralateral teeth. Variables were examined using Mann-Whitney and Pearson´s Chi-Square tests (α = 0.05). The success of the prosthesis was calculated using Kaplan-Meier test.
Results: CDA Quality Criteria was considered satisfactory-excellent in all restorations except for one of them, due to chipping on a PFM crown. At, 66 months, the success rates for PFM and Zr crowns were 85.7 % and 100 %, respectively. The plaque index (PI) showed that the restored abutment teeth accumulated significantly less plaque than the control teeth, but the gingival index (GI) was statistically higher in the abutment teeth. In 80 % of cases the probing depth (PB) was ≤3 mm. In addition, in 21 % of the cases, gingival recession was less than 2 mm. The restoration material had a statistically significant effect on GI and PB, with Zr crowns showing less inflammation and less deep pockets than PFM restorations. On the contrary, greater gingival recession was found at the margins of the Zr crowns when compared to the PFM. No statistical differences were found between the two materials in the GI.
Conclusions: Cemented crowns on vertical preparations show good clinical behavior after 5 years. The periodontal parameters (PI, GI, PD) of the Zr restorations are significantly better than those of PFM, with the exception of gingival recession.
Clinical Relevance: The use of restorations on vertically prepared teeth is a suitable alternative to classical horizontal preparations.
Competing Interests: Declaration of competing interest Mario Gonzalez-Bonilla declares that he has no conflict of interest. Santiago Berrendero declares that he has no conflict of interest. Belen Moron-Conejo declares that she has no conflict of interest. Francisco Martinez-Rus declares that he has no conflict of interest. Maria Paz Salido declares that she has no conflict of interest.
(Copyright © 2024 The Author(s). Published by Elsevier Ltd.. All rights reserved.)

Keywords: Crown; Periodontal parameters; Porcelain-fused-to-metal; Vertical preparation; Zirconia

C6V6S92N3C (Zirconium)
S38N85C5G0 (zirconium oxide)
12001-21-7 (Dental Porcelain)
0 (Metal Ceramic Alloys)

Date Created: 20240330 Date Completed: 20240812 Latest Revision: 20240821

20240821

10.1016/j.jdent.2024.104953

38554803