Premium
Model System for Measuring the Effects of Position and Curvature of Fiber Reinforcement Within a Dental Composite
Author(s) -
Rashidan Nayereh,
Esmaeili Vahid,
Alikhasi Marzieh,
Yasini Sara
Publication year - 2010
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2009.00567.x
Subject(s) - composite material , materials science , crosshead , flexural strength , reinforcement , toughness , fiber , composite number , distilled water , tension (geology) , fiber reinforced composite , flexural modulus , compression (physics) , chemistry , chromatography
Abstract Purpose: The aim of this study was to compare the effect of fiber curvature and position on flexural strength (FS), toughness, and elastic modulus in a dental flowable composite test specimen. Methods and Materials: Test specimens made of composite resin (Denfil Flow) were reinforced with preimpregnated glass fibers (Interlig). Control specimens (group A) did not contain fiber reinforcement. Fibers were placed with different positions and orientations into the test specimens (2 mm × 2 mm × 25 mm) (groups B, C, D). The test specimens (n = 10) were stored in distilled water for 3 days at 37°C before testing in a three‐point loading test (ISO 10477) at a crosshead speed of 1 mm/min to determine FS, flexural modulus (FM), and toughness. Data were analyzed with 1‐way analysis of variance and Tukey HSD (σ= 0.05). Results: The FM varied from 4.7 ± 0.5 to 6.7 ± 0.5 GPa. The lowest flexural strength and toughness values in reinforced specimens resulted from compression side fiber reinforcement (132 ± 12 MPa, 21 ± 4 MJ) and the highest from curved fiber reinforcement (174 ± 8 MPa, 83 ± 28 MJ), though this was not statistically significant from tension‐side reinforcement. Although the toughness of the curved reinforced group was significantly higher than other groups, the flexural strength of curved reinforcement was not significantly higher than tension‐side reinforcement. Conclusion: Position and fiber orientation influenced the flexural strength, FM, and toughness. The most effective in increasing toughness was curved placement of fibers.