Biaxial flexure strength and physicochemical characterization of a CAD/CAM lithium disilicate ceramic: effect of etching time, silane, and adhesive applications.

Autor: da Silva SEG; Department of Dentistry, Federal University of Rio Grande Do Norte (UFRN), Av. Salgado FilhoLagoa Nova, Natal, RN, CEP, 178759056-000, Brazil., de Araújo GM; Department of Dentistry, Oral Science, Federal University of Rio Grande Do Norte (UFRN), Av. Salgado FilhoLagoa Nova, Natal, RN. CEP, 178759056-000, Brazil., Souza KB; Institute of Science and Technology, Univ Estadual Paulista - UNESP, Francisco Jose Longo, Av. Eng, Sao Jose dos Campos, SP, 777, Brazil., Moura DMD; Department of Dentistry, State University of Rio Grande Do Norte (UERN), Rua Almino Afonso, 478 - Centro - Mossoró/RN CEP: 59.610-210, Rio, Brazil., Aurélio IL; Department of Restorative Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil., May LG; Department of Restorative Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul, Brazil., Vila-Nova TEL; School of Dentistry, University of Pernambuco (UPE), Recife, Pernambuco, Brazil., Zhang Y; School of Dental Medicine, Department of Preventive and Restorative, University of Pennsylvania, Philadelphia, PA, 19104, USA., de Assunção E Souza RO; Department of Dentistry, Federal University of Rio Grande Do Norte (UFRN), Av. Salgado FilhoLagoa Nova, Natal, RN, CEP, 178759056-000, Brazil. rodrigoothavio@gmail.com.
Jazyk: angličtina
Zdroj: Clinical oral investigations [Clin Oral Investig] 2022 Nov; Vol. 26 (11), pp. 6753-6763. Date of Electronic Publication: 2022 Aug 18.
DOI: 10.1007/s00784-022-04635-2
Abstrakt: Objective: To evaluate the effect of different acid etching time and bonding agent (silane and/or adhesive system) on biaxial flexural strength and physico-chemical properties of a lithium disilicate ceramic.
Material and Methods: One hundred twenty ceramic discs were made and divided into 8 groups (n = 15) according to factors "etching time" (20 and 120 s) with hydrofluoric acid (HF) and "bonding agent" (C, no bonding agent; S, silane, A, adhesive; and SA, silane + adhesive). After surface treatment, a resin cement layer was applied to the surface and all specimens were subjected to biaxial flexural strength (BFS) test with treated surfaces loaded in tension (1 mm/min). The Weibull analyses and complementary analyses were also performed. Statistical analysis was done with 2-way ANOVA and the Tukey test (α = 0.05).
Results: ANOVA revealed that the factors "etching time" (p = 0.0003) and "bonding agent" (p = 0.007) were statistically significant. In the overall analysis, the HF120S group (272.02 ± 35.30 A MPa) presented significantly higher BFS than that of HF120C (218.45 ± 17.15 CD MPa) and HF20S (228.40 ± 37.83 BCD MPa). On the other hand, the HF20A group (208.92 ± 31.16 D MPa) had significantly lower BFS than HF120S (272.02 ± 35.30 A ), HF120A (254.42 ± 26.87 ABC ) and HF120SA (259.30 ± 36.55 AB ) groups (Tukey). The Weibull modulus (m) of all groups was significantly different from each other (p = 0.000).
Conclusions: Regardless of etching time, the application of silane alone is sufficient to increase the flexural strength of glass ceramic, eliminating the need for the application of adhesive systems. Moreover, if only silane or adhesive is applied, 120-s HF application should increase the flexural resistance of the lithium disilicate ceramic.
Clinical Significance: Applications of adhesive systems after silanization can be suppressed from the surface treatment protocol of glass ceramics, since it does not improve their mechanical strength.
(© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
Externí odkaz: