Nd:YAG Laser to obtain Irregularities on the Inner Surface of Porcelain.
The aim of this study was to evaluate the inner surface of two ceramic systems: IPS Empress II (Ivoclar Vivadent, Germany) and In-Ceram Alumina (Vita Zahnfabrick, Germany) submitted to surface treatments, especially by Nd:YAG laser.



Fifty samples were prepared in pellet form for each ceramic system according to manufacturers' specifications. The samples were stored at room temperature and then be subjected to surface treatment: without treatment (T0) (control), hydrofluoric acid-etched (T1), hydrofluoric acid-etched associated with the airborne particle-abraded (T2); CoJet system (T3), Nd:YAG laser (T4). The data were performed the statistical analysis by ANOVA and Tukey's test (p < 0.001).



The group control (T0) of the ceramics, the analysis showed the lowest roughness values; for the System Alumina In-Ceram, treatment with hydrofluoric acid (T1), associated with hydrofluoric acid and airborne particle-abraded (T2) and Nd:YAG laser (T4), had no statistically significant difference, whereas for the IPS Empress System II treatment with hydrofluoric acid (T1) and hydrofluoric acid associated with airborne particle-abraded (T2), had no statistically significant difference between the system and also CoJet (T3) and hydrofluoric acid associated with the airborne particle-abraded (T2). Photomicrographs of scanning electron microscopy showed different characteristics to the treatments for each ceramic system.



The IPS Empress II had the appearance of favoring the retention when treated with hydrofluoric acid, as well as its association with the airborne particle-abraded. Uncertainty in Alumina, treatment with hydrofluoric acid associated with the airborne particle-abraded and CoJet system and provided a surface with irregularities. With respect to the laser further studies should be performed for parameters that are ideal for your application.



The ceramic restorations are attractive due of their excellent esthetics and the ability to stay for long periods. However, the retention of ceramic requires further study.
Department of Restorative Dentistry, Universidade Estadual Paulista, Araraquara, Sao Paulo, Brazil.
Thiago Soares
TS
Porto
Department of Restorative Dentistry, Universidade Estadual Paulista, Araraquara, Sao Paulo, Brazil.
Betina Grehs
BG
Porto
Department of Restorative Dentistry, Universidade Estadual Paulista, Araraquara, Sao Paulo, Brazil.
Edson Alves
EA
de Campos
Department of Restorative Dentistry, Universidade Estadual Paulista, Araraquara, Sao Paulo, Brazil.
Sizenando de Toledo
Sde T
Porto-Neto
Department of Postgraduate Program in Dentistry, CEUMA University, Sao Luis, MA, Brazil.
Monica Barros
MB
da Silva
Department of Conservative Dentistry and Endodontics, MS Ramaiah Dental College and Hospital, Bengaluru, Karnataka India.
Shilpa H
SH
Bhandi
Department of Dentistry, University of Cuiaba, Postgraduation in Integrated Sciences, Cuiaba, MT, Brazil.
Mateus Rodrigues
MR
Tonetto
Department of Restorative Dentistry, Universidade Estadual Paulista, Araraquara, Sao Paulo, Brazil.
Welingtom
W
Dinelli
Professor, Department of Postgraduate Program in Dentistry, CEUMA University, Rua Josue Montello, s/n, Zip Code: 65.075-120 Sao Luis, MA, Brazil, e-mail: matheus.bandeca@utoronto.ca.
Matheus Coelho
MC
Bandeca
D000134:Acid Etching, Dental / Q000379:methods; D003776:Dental Porcelain / Q000737:chemistry*; D006858:Hydrofluoric Acid / Q000737:chemistry; D053844:Lasers, Solid-State; D008422:Materials Testing / Q000379:methods; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties
D003776:Dental Porcelain; D006858:Hydrofluoric Acid
Ceramics; Laser; Scanning electron microscopy.