Influence of aluminum oxide sandblasting associated with Nd:YAG or Er:YAG lasers on shear bond strength of a feldspathic ceramic to resin cements.
OBJECTIVE
This in vitro study evaluated the influence of the surface pretreatment of a feldspathic ceramic on the shear bond strength of two different resin cements.


BACKGROUND
Although several conventional surface treatments have been used on feldspathic ceramic, few studies have investigated the effects of an alternative surface treatment, the association of aluminum oxide sandblasting with Nd:YAG and Er: YAG lasers.


METHODS
Sixty samples made of a feldspathic ceramic were divided into three groups (n = 20) and treated with (1) controlled-air abrasion with Al(2)O(3) + 10% hydrofluoric acid (HF), (2) Al(2)O(3) + Er:YAG laser, and (3) Al(2)O(3) +Nd:YAG laser. Afterward, silane (Dentsply) was applied on each treated surface. Each of the three main groups was divided into two subgroups (n = 10), where a different resin cement was employed for each subgroup. It was built a cylinder with resin cement (RelyX Arc) in subgroup (A) and with self-adhesive cement (RelyX U100) in subgroup (B). After 24 h at 37 degrees C, the prepared specimens were submitted to shear bond strength test and stereoscopic evaluation to determine the type of failure.


RESULTS
Bond strength mean values were not statistically significant for the surface treatment methods or resin cements.


CONCLUSIONS
The null surface treatment proposed with aluminum oxide sandblasting associated with the Er:YAG or Nd:YAG laser and using cementation with self-adhesive cement can be an alternative bonding technique for feldspathic ceramic, since it was as effective as the conventional treatment with aluminum oxide sandblasting and hydrofluoric acid using the conventional resin cement.
Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, Brazil.
Stella
S
da Silva Ferreira
Fernando Seishim
FS
Hanashiro
Wanessa Christine
WC
de Souza-Zaroni
Miriam Lacalle
ML
Turbino
Michel Nicolau
MN
Youssef
D000537:Aluminum Oxide / Q000737:chemistry; D000538:Aluminum Silicates / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods; D045662:Dental Etching / Q000379:methods*; D003776:Dental Porcelain; D006801:Humans; D066298:In Vitro Techniques; D053844:Lasers, Solid-State; D008422:Materials Testing; D017680:Potassium Compounds / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry
D000538:Aluminum Silicates; D017680:Potassium Compounds; D019279:Resin Cements; D003776:Dental Porcelain; C016447:feldspar; D000537:Aluminum Oxide