Efecto del grabado con ácido fluorhídrico en cerámicas de disilicato de litio. Revisión sistemática.

Abstract

Introduction: Lithium disilicate ceramic is a material that needs pre-conditioning to create the roughness necessary to place the cement. Hydrofluoric acid is considered the gold standard, currently this acid is available in different concentrations and is applied at different times, the roughness and flexural strength of the ceramic will depend on this. Objective: To determine the effect of etching with hydrofluoric acid at different etching concentrations and times on the surface appearance and resistance of lithium disilicate ceramics. Materials and methods: This research is a systematic review, 340 articles were found, then several articles were discarded according to the inclusion and exclusion terms, leaving a total of 41 articles, which were used for this research. Results: In 32 articles they agreed that the ideal etching time is 20 seconds, in 19 articles it was found that the ideal hydrofluoric acid concentration is 5%, in 22 of 39 articles they indicated that the best method of processing ceramics is For IPS e.Max CAD, the highest levels of roughness in the ceramics were the ceramics etched with 9.6% acid for 60 seconds and the lithium disilicate ceramics etched at 5% for 20 seconds gave the best result in resistance to abrasion. bending between 370 to 460 MPa. Conclusions: It is necessary for lithium disilicate ceramics to be etched with 5% hydrofluoric acid, for an etching time of 20 seconds, this protocol will not have a negative effect on the flexural strength of the ceramic