Objectives: The aim was to investigate the influence of cusp inclinations and curvatures on the failure behaviour and fracture resistance of veneered zirconia crowns.
Materials And Methods: Five groups (n = 8/group) of zirconia-based molar crowns were fabricated by modifying cusp inclination (S, steep = 45°; M, medium = 30°; F, flat = 10°) and curvature (P, pointed; R, round; O, round-oblate). Combinations MP, MR, SP, SR and FO were investigated. All crowns were fixed on polymethylmethacrylate teeth, thermally cycled and mechanically loaded. Failures were monitored and fracture resistance was determined after ageing. Crowns were fractographically analysed with scanning electron microscopy.
Results: Chipping during thermal cycling and mechanical loading (TCML) was observed in groups MR (1×), SP (6×) and SR (3×). Defect sizes varied between 0.12 mm(2) (MR) and 17.28 mm(2) (SP). Failures started from occlusal contacts. Mean fracture varied significantly between 1,354.2 ± 360.0 N (SR) and 3,155.8 ± 444.4 N (FO).
Conclusions: Cusp inclination and curvature influenced failures during TCML and fracture loads. Crowns with medium cusp inclination and pointed or round curvature are recommended for clinical application as they revealed high resistance to chipping. Steep inclination, especially in combination with pointed curvature, was shown to increase chipping rates and areas and to decrease fracture force.
Clinical Relevance: The results show the necessity of considering design parameters of the veneer in order to reduce failures of zirconia-based crowns.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1007/s00784-013-1029-9 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Three-dimensional finite element analysis of occlusal stress on maxillary first molars with different marginal morphologies restored with occlusal veneers.
BMC Oral Health
November 2024
Department of Prosthodontics, School of Stomatology, Guizhou Medical University, Affiliated Stomatology Hospital of Guizhou Medical University, Guiyang, Guizhou Province, 550004, China.
Article Synopsis
- A study was conducted to investigate the effectiveness of different edge designs for occlusal veneers on maxillary first molars, emphasizing the need for standardized clinical protocols due to varying research outcomes.
- The research involved creating 3D models of teeth and testing three edge designs (SFL, CFL, SCI) with varying thicknesses (0.5 mm and 1.0 mm), using finite element analysis to assess stress distribution under bite forces.
- Results showed that increased veneer thickness raised stress in SFL and CFL designs, while SCI saw reduced stress; however, SCI also risked exceeding adhesive strength, suggesting potential issues with this design in clinical settings.*
A retrospective study on the influence of inclination of cusp on implant marginal bone height in patients with periodontal disease.
Acta Odontol Scand
September 2024
Department of Periodontology, The Affiliated Nantong Stomatological Hospital of Nantong University, Nantong, Jiangsu province, P.R. China.
To investigate the correlation between the marginal bone height of implants in the posterior maxilla of patients with periodontal disease and the inclination of cusp, providing a theoretical basis for the occlusal design of implant restorations in such patients. Methods: A total of 80 patients with periodontal disease who underwent implant restoration in the posterior maxilla (55 men and 25 women; mean age 56.66 ± 12.
View Article and Find Full Text PDFModeling fracture in multilayered teeth using the finite volume-based phase field method.
J Mech Behav Biomed Mater
September 2024
Computing Center for Geotechnical Engineering, Department of Civil Engineering, Zhejiang University, Hangzhou, 310058, China. Electronic address:
The present work, utilizing the finite volume-based phase field method (FV-based PFM), aims to investigate the initiation and propagation of cracks in the second molar of the left mandible under occlusal loading. By reconstructing cone beam computed tomography scans of the patient, the true morphology and internal mesostructure of the entire tooth are implemented into numerical simulations, including both 2D slice models and a realistic 3D model. Weibull functions are introduced to represent the tooth's heterogeneity, enabling the stochastic distribution characteristics of mechanical parameters.
View Article and Find Full Text PDFCraniomandibular transverse tomographic evaluation after anterior open bite orthodontic treatment with miniplates anchorage.
Prog Orthod
May 2024
Division of Oral Radiology, Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic, R. Dr. José Rocha Junqueira, 13-Pte. Preta, Campinas, São Paulo, SP, 13045-755, Brazil.
Background: Skeletal anterior open bite (SAOB) represents one of the most complex and challenging malocclusions in orthodontics. Orthodontic treatment supported by miniplates enable to reduce the need for orthognathic surgery. Transverse dimension may be affected by intrusion biomechanics.
View Article and Find Full Text PDFStatic and dynamic stress analysis of different crown materials on a titanium base abutment in an implant-supported single crown: a 3D finite element analysis.
BMC Oral Health
May 2024
Department of Prosthodontics, Faculty of Dentistry, Istanbul Okan University, Istanbul, Türkiye.
Background: This Finite Element Analysis was conducted to analyze the biomechanical behaviors of titanium base abutments and several crown materials with respect to fatigue lifetime and stress distribution in implants and prosthetic components.
Methods: Five distinct designs of implant-supported single crowns were modeled, including a polyetheretherketone (PEEK), polymer-infiltrated ceramic network, monolithic lithium disilicate, and precrystallized and crystallized zirconia-reinforced lithium silicates supported by a titanium base abutment. For the static load, a 100 N oblique load was applied to the buccal incline of the palatal cusp of the maxillary right first premolar.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!