Radiant exposure effects on physical properties of methacrylate - and silorane-composites

Autor(es)

Anderson Catelan ^[1] ; Yoshio Kawano ^[2] ; Paulo Henrique dos Santos ^[3] ; Gláucia Maria Bovi Ambrosano ^[4] ; Ana Karina Bedran-Russo ^[5] ; Flávio Henrique Baggio Aguiar ^[6]

Afiliação do(s) autor(es)

^[1] Universidade Estadual de Campinas. Piracicaba Dental School. Department of Restorative Dentistry - Brasil

^[2] Universidade de São Paulo. Institute of Chemistry. Department of Fundamental Chemistry - Brasil

^[3] Universidade Estadual Paulista. Araçatuba Dental School. Department of Dental Materials and Prosthodontics - Brasil

^[4] Universidade Estadual de Campinas. Piracicaba Dental School. Department of Social Dentistry - Brasil

^[5] University of Illinois at Chicago. College of Dentistry. Department of Restorative Dentistry - Estados Unidos

^[6] Universidade Estadual de Campinas. Piracicaba Dental School. Department of Restorative Dentistry - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Braz. J. Oral Sci.; v. 13, n. 3, p. 168-174, 2014-09-00.

Resumo

AIM: To evaluate the effect of different radiant exposures on the degree of conversion (DC), Knoop hardness number (KHN), plasticization (P), water sorption (WS), and solubility (S) of different monomer resin-based composites. METHODS: Circular specimens (5 x 2 mm) were manufactured from methacrylate and silorane composite resins, and light-cured at 19.8, 27.8, 39.6, and 55.6 J/cm2, using second-generation LED at 1,390 mW/cm2. After 24 h, DC was obtained using a FT-Raman spectrometer equipped with a Nd:YAG laser, KHN was measured with 50-g load for 15 s, and P was evaluated on the top and bottom surfaces by the percentage of hardness reduction after 24 h immersed in absolute alcohol. WS and S were determined according to ISO 4049. Data were subjected to statistical analysis (α=0.05). RESULTS: Methacrylate material presented higher DC, KHN, P, and WS than silorane (p<0.05). There was no difference in the S values (p>0.05). The increased radiant exposures improved only the KHN (p<0.05). In general, top surfaces showed higher DC and KHN than bottom, for both materials (p<0.05). The increase of the radiant exposure did not improve most physical properties of the composites and were monomer-base dependent. CONCLUSIONS: Chemical composition of the composite resins resulted in different physical properties behavior and could affect the clinical longevity of dental restorations, but overall these properties were not influenced by the different radiant exposures evaluated in the study. (AU)

• Processo FAPESP: 10/05666-9 - Influência da densidade de energia nas propriedades físicas e resistência de união de dois sistemas restauradores
• Beneficiário: Anderson Catelan
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/15076-4 - Influência da densidade de energia nas propriedades físicas e resistência de união de dois sistemas restauradores
• Beneficiário: Flávio Henrique Baggio Aguiar
• Modalidade de apoio: Auxílio à Pesquisa - Regular