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Microhardness homogeneity of RBCs light-cured with a multiple-peak LED and surface characterization after wear
Sahadi, Beatriz Ometto; Nima, Gabriel; Andre, Carolina Bosso; Sebold, Maicon; Palma-Dibb, Regina Guenka; Faraoni, Juliana Jendiroba; Giannini, Marcelo.
  • Sahadi, Beatriz Ometto; University of Campinas. Piracicaba Dental School. Department of Restorative Dentistry. Piracicaba. BR
  • Nima, Gabriel; University of Campinas. Piracicaba Dental School. Department of Restorative Dentistry. Piracicaba. BR
  • Andre, Carolina Bosso; Federal University of Minas Gerais. School of Dentistry. Department of Restorative Dentistry. Belo Horizonte. BR
  • Sebold, Maicon; University of Campinas. Piracicaba Dental School. Department of Restorative Dentistry. Piracicaba. BR
  • Palma-Dibb, Regina Guenka; University of São Paulo. Ribeirão Preto School of Dentistry. Department of Restorative Dentistry. Ribeirão Preto. BR
  • Faraoni, Juliana Jendiroba; University of São Paulo. Ribeirão Preto School of Dentistry. Department of Restorative Dentistry. Ribeirão Preto. BR
  • Giannini, Marcelo; University of Campinas. Piracicaba Dental School. Department of Restorative Dentistry. Piracicaba. BR
Braz. dent. j ; 32(3): 92-104, May-June 2021. tab, graf
Article in English | LILACS, BBO | ID: biblio-1345500
ABSTRACT
Abstract This in vitro study evaluated the effect of the beam homogeneity of a multiple-peak light-curing unit on the surface microhardness and the effect of toothbrushing wear on the microhardness, surface roughness, roughness profile, volume loss, and gloss retention of incremental and bulk-fill resin-based composites (RBCs). A LED light-curing unit (VALO) with four LEDs at the tip end (405, 445, 465A, and 465B nm emission peak) was used according to each manufacturer-recommended time to obtain disks (n=10) of six RBCs Estelite Sigma Quick, Charisma Classic, Tetric EvoCeram Bulk Fill, Filtek Z250, Filtek Supreme Ultra, and Filtek Bulk Fill. Microhardness values were obtained according to each LED positioning of the light-curing unit on the top surface of the RBCs and were analyzed before and after toothbrushing regarding microhardness, surface roughness, roughness profile, volume loss, and gloss retention. Microhardness was considered homogeneous on the top surface regardless of the type of RBC or wavelength tested (p>0.05). Overall, toothbrushing did not reduce the microhardness of the RBCs but influenced the gloss values for most RBCs (p<0.001). Charisma Classic presented the greatest surface roughness and roughness profile after toothbrushing (p<0.05). Volume loss did not differ among RBCs (p>0.05). In conclusion, different wavelengths of the LED did not affect the top surface microhardness, regardless of the RBCs tested; and bulk-fill composites presented similar surface changes (microhardness, surface roughness, roughness profile, volume loss, and gloss retention) when compared to conventional composites after toothbrushing.
RESUMO
Resumo Este estudo in vitro avaliou a homogeneidade do feixe de um fotopolimerizador de múltiplos picos na microdureza superficial e o efeito da escovação na microdureza, rugosidade superficial, perfil de rugosidade, perda de volume e retenção do brilho de compósitos a base de resina (RBCs) incrementais ou bulk-fill. Um fotopolimerizador LED (VALO) com quatro LEDs na ponteira (405, 445, 465A e 465B nm de pico de emissão) foi usado de acordo com o tempo recomendado por cada fabricante para obtenção de discos (n=10) de seis RBCs Estelite Sigma Quick, Charisma Classic, Tetric EvoCeram Bulk Fill, Filtek Z250, Filtek Supreme Ultra e Filtek Bulk Fill. Os valores de microdureza foram obtidos seguindo o posicionamento de cada LED na superfície superior das amostras e foram analisados antes e após a escovação quanto a microdureza, rugosidade superficial, perfil de rugosidade, perda de volume e retenção do brilho. A microdureza foi considerada homogênea no topo da superfície, independentemente do tipo de RBCs ou comprimento de onda testados (p>0.05). No geral, a escovação não reduziu a microdureza das RBCs, mas influenciou o brilho para a maioria das RBCs (p<0.001). Charisma Classic apresentou os maiores valores de rugosidade superficial e perfil de rugosidade após a escovação (p<0.05). A perda de volume não diferiu entre as RBCs (p>0.05). Em conclusão, os diferentes comprimentos de onda do LED não alteraram a microdureza do topo da superfície, independentemente das RBCs testadas; e as resinas bulk-fill apresentaram alterações superficiais similares (microdureza, rugosidade superficial, perfil de rugosidade, perda de volume e manutenção do brilho) quando comparadas às resinas convencionais após a escovação.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Composite Resins / Dental Materials Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2021 Type: Article Affiliation country: Brazil Institution/Affiliation country: Federal University of Minas Gerais/BR / University of Campinas/BR / University of São Paulo/BR

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Full text: Available Index: LILACS (Americas) Main subject: Composite Resins / Dental Materials Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2021 Type: Article Affiliation country: Brazil Institution/Affiliation country: Federal University of Minas Gerais/BR / University of Campinas/BR / University of São Paulo/BR