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Flexural and diametral tensile strength of composite resins
Della Bona, Álvaro; Benetti, Paula; Borba, Márcia; Cecchetti, Dileta.
  • Della Bona, Álvaro; University of Passo Fundo. School of Dentistry. Passo Fundo. BR
  • Benetti, Paula; Federal University of Pelotas. School of Dentistry. Operative Dentistry. Pelotas. BR
  • Borba, Márcia; University of São Paulo. School of Dentistry. Dental Materials. São Paulo. BR
  • Cecchetti, Dileta; University of Passo Fundo. Institute of Biological Sciences. Passo Fundo. BR
Braz. oral res ; 22(1): 84-89, Jan.-Mar. 2008. tab
Article in English | LILACS | ID: lil-480589
ABSTRACT
This study evaluated the flexural strength (sf) and the diametral tensile strength (st) of light-cured composite resins, testing the hypothesis that there is a positive relation between these properties. Twenty specimens were fabricated for each material (Filtek Z250- 3M-Espe; AM- Amelogen, Ultradent; VE- Vit-l-escence, Ultradent; EX- Esthet-X, Dentsply/Caulk), following ISO 4049 and ANSI/ADA 27 specifications and the manufacturers’ instructions. For the st test, cylindrical shaped (4 mm x 6 mm) specimens (n = 10) were placed with their long axes perpendicular to the applied compressive load at a crosshead speed of 1.0 mm/min. The sf was measured using the 3-point bending test, in which bar shaped specimens (n = 10) were tested at a crosshead speed of 0.5 mm/min. Both tests were performed in a universal testing machine (EMIC 2000) recording the fracture load (N). Strength values (MPa) were calculated and statistically analyzed by ANOVA and Tukey (a = 0.05). The mean and standard deviation values (MPa) were Z250-45.06 ± 5.7; AM-35.61 ± 5.4; VE-34.45 ± 7.8; and EX-42.87 ± 6.6 for st; and Z250-126.52 ± 3.3; AM-87.75 ± 3.8; VE-104.66 ± 4.4; and EX-119.48 ± 2.1 for sf. EX and Z250 showed higher st and sf values than the other materials evaluated (p < 0.05), which followed a decreasing trend of mean values. The results confirmed the study hypothesis, showing a positive relation between the material properties examined.
Subject(s)

Full text: Available Index: LILACS (Americas) Main subject: Composite Resins / Dental Materials / Dental Restoration, Permanent Language: English Journal: Braz. oral res Journal subject: Dentistry Year: 2008 Type: Article Affiliation country: Brazil Institution/Affiliation country: Federal University of Pelotas/BR / University of Passo Fundo/BR / University of São Paulo/BR

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Full text: Available Index: LILACS (Americas) Main subject: Composite Resins / Dental Materials / Dental Restoration, Permanent Language: English Journal: Braz. oral res Journal subject: Dentistry Year: 2008 Type: Article Affiliation country: Brazil Institution/Affiliation country: Federal University of Pelotas/BR / University of Passo Fundo/BR / University of São Paulo/BR