Journal article
Fracture strength, pull-out bond strength, and volume of luting agent of tooth-colored CAD-CAM post-and-cores
The Journal of prosthetic dentistry, Vol.129(4), pp.599-606
04/2023
DOI: 10.1016/j.prosdent.2022.06.012
PMID: 36127164
Abstract
Little is known about the fracture strength, retention, and adaptation of post-and-cores fabricated with novel tooth-colored materials by computer-aided design and computer-aided manufacturing (CAD-CAM).
The purpose of this in vitro study was to investigate the fracture strength, pull-out bond strength (POBS), and volume of luting agent of endodontically treated premolars restored with post-and-cores milled from different CAD-CAM materials.
Post spaces were prepared in 80 human premolars in which post-and-cores fabricated with polyetheretherketone (PK; Ceramill PEEK), nanohybrid composite resin (BB; Brava Block), polymer-infiltrated ceramic (EN; VITA Enamic), and fiber-reinforced epoxy resin (GF; Fiber Cad Post & Core) CAD-CAM materials were luted (n=20). All specimens were subjected to thermal aging (3000 cycles at 5 °C and 55 °C with a 20-second dwell time). Half of the specimens were subjected to mechanical fatigue (250 000 cycles at 5 Hz) before fracture strength testing, while the other half was submitted to POBS testing and volume of luting agent measurement. Fracture strength data were analyzed by 1-way ANOVA, while POBS and volume of luting agent data were submitted to Kruskal-Wallis followed by the Bonferroni-Dunn multiple comparison tests. The correlation between POBS and the volume of luting agent was determined by the Spearman test (α=.05).
POBS of GF was significantly higher than that for PK (P<.001); however, failure load (P=.160) and volume of luting agent (P=.390) values did not differ. EN showed the highest percentage of catastrophic failures (20%), while PK exhibited only core deformations. POBS and cement film volume were not significantly correlated (P>.05).
Different CAD-CAM materials did not influence the fracture strength and volume of luting agent of post-and-cores. Post-and-cores made with PEEK blocks showed lower bond strength to intracanal dentin than those made with fiber-reinforced epoxy resin blocks. No significant correlation was found between bond strength and the volume of luting agent.
Details
- Title: Subtitle
- Fracture strength, pull-out bond strength, and volume of luting agent of tooth-colored CAD-CAM post-and-cores
- Creators
- Hiromi Saisho - University of Iowa, Family DentistryGabriela Marcolina - Pontifícia Universidade Católica do ParanáFabricio Perucelli - Pontifícia Universidade Católica do ParanáRogério Goulart da Costa - Professor, Dental Prosthesis Course, Federal Institute of Paraná (IFPR), Curitiba, PR, BrazilEvelise Machado de Souza - Pontifícia Universidade Católica do ParanáRodrigo Nunes Rached - Pontifícia Universidade Católica do Paraná
- Resource Type
- Journal article
- Publication Details
- The Journal of prosthetic dentistry, Vol.129(4), pp.599-606
- Publisher
- Elsevier Inc
- DOI
- 10.1016/j.prosdent.2022.06.012
- PMID
- 36127164
- ISSN
- 0022-3913
- eISSN
- 1097-6841
- Language
- English
- Date published
- 04/2023
- Academic Unit
- Family Dentistry
- Record Identifier
- 9984655347302771
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