Short fibre-reinforced composite for extensive direct restorations: a laboratory and computational assessment
| Autor: | Jan De Munck, Jos Vander Sloten, Bart Van Meerbeek, Diogo Pedrollo Lise, Annelies Van Ende, Bruno de Castro Ferreira Barreto, Siegfried Jaecques, Pedro Yoshito Noritomi |
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| Rok vydání: | 2015 |
| Předmět: |
Dental Stress Analysis
Materials science Surface Properties Finite Element Analysis Composite number 02 engineering and technology Dental Caries In Vitro Techniques Composite Resins Stress (mechanics) 03 medical and health sciences Posterior Tooth 0302 clinical medicine Flexural strength Materials Testing Humans von Mises yield criterion Bicuspid Dental Restoration Failure Composite material Dental Restoration Permanent General Dentistry 030206 dentistry 021001 nanoscience & nanotechnology Dentin-Bonding Agents Fracture (geology) Tukey's range test 0210 nano-technology Failure mode and effects analysis |
| Zdroj: | Clinical Oral Investigations. 20:959-966 |
| ISSN: | 1436-3771 1432-6981 |
| DOI: | 10.1007/s00784-015-1576-3 |
| Popis: | The objective of the study was to evaluate the effectiveness of a short fibre-reinforced composite (FRC) applied in combination with a conventional filler composite (CFC) on the fatigue resistance, fracture strength, failure mode and stress distribution, for restorations of premolars under two loading angles. Thirty-two inferior premolars received extensive cavities with removal of the lingual cusp. Teeth were restored directly using ‘FRC (EverX Posterior, GC) + CFC (G-aenial, GC)’ or ‘CFC only’ and received two fatigue/fracture loadings at two different angles (0°/45°) (n = 8). Data were submitted to two-way ANOVA (α = 5 %) and Tukey test. Failure mode was analysed using SEM. Four 3D finite element (FE) models were constructed and static, linear and elastic analyses were performed. Maximum principal and von Mises stresses were evaluated. All specimens survived the mechanical fatigue simulation. No statistical difference in fracture resistance was recorded between FRC + CFC and CFC only, considering both loading angles (p = 0.115). However, the 0° loading showed a statistical significant higher strength than the 45° loading (p = 0.000). Failure mode analysis revealed more repairable fractures upon 0° loading, versus more root fractures (unrepairable) upon 45° loading. FE revealed a higher amount of stress upon 45° loading, with tensile stress being imposed to the lingual cervical area. The fracture strength was not increased using the FRC. Loading at a 45° decreased significantly the fracture resistance. The restoration of extensive cavities in posterior tooth is a challenge for the clinicians and the choice of the material that increases the fracture strength of tooth-restoration complex is required. |
| Databáze: | OpenAIRE |
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