Resistance to Fracture of Zirconia Abutments with Different Angulations: Impact of Implant Platform Diameter.
Journal
European journal of dentistry
ISSN: 1305-7456
Titre abrégé: Eur J Dent
Pays: Germany
ID NLM: 101303672
Informations de publication
Date de publication:
Oct 2020
Oct 2020
Historique:
pubmed:
10
7
2020
medline:
10
7
2020
entrez:
10
7
2020
Statut:
ppublish
Résumé
The aim of this study was to assess the impact of implant platform diameters on ultimate force to failure of zirconia abutments with different angulation. Forty-two zirconia abutments with either 0 degree (ST) or 15-degree (AN) angulation were assembled on tapered internal connection titanium implants (Direct's Legacy; 13 mm Implant Direct, LLC, Las Vegas, United States) with a platform diameter of Ø3.0, Ø3.5, and Ø4.5 mm (14 per group). Zirconia crowns (Ceramill Zolid; Amann Girrbach GmbH) were fabricated and cemented using self-adhesive resin cement (MaxCem Elite, Kerr). The specimens were thermomechanically loaded (TCML= 6,000 cycles of 5 to 50°C for 2 minutes/cycle followed by cyclic loading 600,000 cycles) followed by static loading until fracture. The data of load (N) at which fracture occurred were statistically analyzed by using Kruskal-Wallis analysis of variance and Mann-Whitney U tests at 5% significance level. Higher load to fracture was reported for zirconia crowns in straight abutments groups and a platform of 4.5, 3.5, and 3 mm diameter was 438.2± 85.4, 345.5± 71.3, and 331.1± 59.1 N, respectively. However, the groups restored with zirconia crowns in angulated abutments groups and a platform of 4.5, 3.5, or 3 mm diameter showed a fracture load of 411.4 ± 49.8, 354.2 ± 52.5, and 302.8 ± 52.5 N, respectively. Straight and angulated zirconia abutments presented similar load to fracture on 3 and 3.5 mm platform diameters yet being significantly less for 4.5 mm diameter.
Identifiants
pubmed: 32645732
doi: 10.1055/s-0040-1709947
pmc: PMC7535972
doi:
Types de publication
Journal Article
Langues
eng
Pagination
517-524Déclaration de conflit d'intérêts
None declared.
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