Influence of resin cement and thermocycling on milled lithium disilicate ceramic microshear bond strength.

Autor:	Paloco EA; Universidade Pitágoras Unopar, Faculdade de Odontologia, Departamento de Odontologia Restauradora, Londrina, Brasil., Berger SB; Universidade Pitágoras Unopar, Faculdade de Odontologia, Departamento de Odontologia Restauradora, Londrina, Brasil., Lopes MB; Universidade Pitágoras Unopar, Faculdade de Odontologia, Departamento de Odontologia Restauradora, Londrina, Brasil., Favaro JC; Universidade Pitágoras Unopar, Faculdade de Odontologia, Departamento de Odontologia Restauradora, Londrina, Brasil., Gonini-Júnior A; Universidade Estadual de Londrina, Faculdade de Odontologia, Departamento de Odontologia Restauradora, Londrina, Brasil., Piauilino AI; Universidade de Cuiabá , Faculdade de Odontologia, Departamento de Odontologia, Cuiabá, Brasil., Borba AM; Universidade de Cuiabá , Faculdade de Odontologia, Departamento de Odontologia, Cuiabá, Brasil., Guiraldo RD; Universidade Pitágoras Unopar, Faculdade de Odontologia, Departamento de Odontologia Restauradora, Londrina, Brasil. rdguiraldo@gmail.com.
Jazyk:	angličtina
Zdroj:	Acta odontologica latinoamericana : AOL [Acta Odontol Latinoam] 2021 Dec 31; Vol. 34 (3), pp. 226-232.
DOI:	10.54589/aol.34/3/226
Abstrakt:	The aim of this study was to compare the microshear bond strength of different resin cements to CAD/CAM-created lithium disilicate ceramics after 24 hours and after 1 year (10,000 thermocycles). Forty (40) ceramic bars were subjected to pretreatment comprising airborne abrasion with aluminum oxide particles, etching with 10% hydrofluoric acid and Monobond N application. Bars were divided into 4 groups (n = 10), based on cement type: light-cured Variolink Esthetic LC (VLC) and dual-cured Variolink N (VN) at two different times: after 24 hours and after 1 year. Silicone molds were used to prepare cement cylinders on a ceramic surface. The set was stored in distilled water at 37ºC, for 24 hours or subjected to 10,000 thermocycles. The molds were removed and microshear bond strength was tested. Data were submitted to two-way analysis of variance and Tukey's test (α = 0.05). Based on the comparison between cement values at different aging times (p = 0.035), VN after 24 hours (27.10 ± 0.92) and after 1 year (20.62 ± 1.25) presented significantly higher values than VLC after 24 hours (14.79 ± 0.76) and after 1 year (6.61 ± 0.81). Bond strength recorded for both cements after 24 hours (VN: 27.10 ± 0.92 and VLC: 14.79 ± 0.76) was significantly higher than the one recorded after 1 year (VN: 20.62 ± 1.25 and VLC: 6.61 ± 0.81). The thermocycling reduced the values observed for both investigated cements; bond strength was greater for dual-cure resin cement than for light-cured resin cement. Competing Interests: The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article (Sociedad Argentina de Investigación Odontológica.)
Databáze:	MEDLINE
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