European Journal of Prosthodontics and Restorative Dentistry

Influence of Short Fiber Reinforced Composites on Fracture Resistance of Single-Structure Restorations

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Cover Date

December 2020

Print ISSN

0965-7452

Electronic ISSN

2396-8893

Vol

28

Issue

4

Abstract

Objective: The aim was to determine the load-bearing capacity of anterior crowns prepared using two types of single-structure short fibre-reinforced composites (SFRCs). Furthermore, fracture toughness (FT), flexural strength (FS) and flexural modulus (FM) of tested composites were measured. Methods: Seven groups of composite crowns were designed for an upper central incisor (n=8/group). Two groups were CAD/CAM fabricated made of Cerasmart 270 and experimental single-structure SFRC blocks. Two groups were 3D-printed made of GC Temp PRINT and Pro3dure GR-17 composites. Two groups were made of conventional light-cured composites (Essentia and Gradia Plus). The last group was a single-structure SFRC made of commercial flowable SFRC (everX
Flow). Crown restorations were loaded until fracture. Failure-modes were then visually examined. FT, FS and FM were determined for each tested composite (n=8). The data were analysed using analysis of variance (p=0.05) followed by Tukey’s post-hoc test. Results: ANOVA revealed that crowns made of experimental SFRC blocks had significantly higher load-bearing capacities (1650 ±230 N) (p<0.05) among all the groups tested. Experimental SFRC blocks exhibited the highest FT (2.9 MPa m1/2) and FS (245.8 MPa) values (p<0.05) among tested composites. Conclusion: CAD/CAM fabricated restorations
made of experimental SFRC blocks demonstrated encouraging performance related to their fracture-behaviour.

Keywords
3D-Printing
Fracture Behavior
Single-Structure Restoration
Anterior Crown
Fiber Composite