Effect of surface treatments on the shear bond strength of luting cements to Y-TZP ceramic

Autor(es)

Sciasci, Plinio ^[1] ; Abi-Rached, Filipe Oliveira ^[2] ; Adabo, Gelson Luis ^[2] ; Baldissara, Paolo ^[3] ; Fonseca, Renata Garcia ^[2]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, UNESP, Araraquara Dent Sch, Dept Diag & Surg, BR-14801903 Sao Paulo - Brazil

^[2] Sao Paulo State Univ, UNESP, Araraquara Dent Sch, Dept Dent Mat & Prosthodont, BR-14801903 Sao Paulo - Brazil

^[3] Univ Bologna, Dept Oral Sci, Div Prosthodont, Alma Mater Studiorum, Bologna - Italy

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PROSTHETIC DENTISTRY; v. 113, n. 3, p. 212-219, MAR 2015.
• Citações Web of Science: 13

Resumo

Statement of problem. Because zirconia is a glass-free material, alternative surface treatments such as airborne-particle abrasion or silica coating should be used for long-term bonding. However, these surface treatments in combination with different bonding agents and luting cements have not yet been studied. Purpose. The purpose of the study was to evaluate the effect of surface treatments on the shear bond strength (SBS) of luting cements to Y-TZP ceramic. Material and methods. Zirconia disks (N=240) were airborne-particle abraded with the following particles (n=48): 50 mu m Al2O3; 120 mu m Al2O3; 30 gm silica-coated Al2O3 (Rocatec Soft); 120 mu m Al2O3+110 mu m silica-coated Al2O3 (Rocatec Plus); and Rocatec Plus. After silanization of the zirconia surface, composite resin disks were bonded with (n=12) RelyX Luting 2; RelyX ARC; RelyX U100; and Panavia F. The bonded specimens were thermocycled (10 000 cycles) and tested for SBS. Failure mode was determined with a stereomicroscope (x20). The morphology and elemental composition of airborne-particle abraded surfaces were evaluated with scanning electron microscopy (x500) and energy-dispersive x-ray spectroscopy (x50). Results. Surface treatments, cements, and their interaction were significant (P<.001). For RelyX ARC, Rocatec Soft and Rocatec Plus provided the highest SBS. In general, surface treatments did not influence the SBS of RelyX U100 and Panavia F. Regardless of the cement, no significant difference was found between 50 mu m and 120 mu m Al2O3 particles, between Rocatec Soft and Rocatec Plus, or between Rocatec Plus and 120 mu m Al2O3 particles+Rocatec Plus. All groups showed adhesive failures. Different particle sizes provided differences in morphological patterns. The elemental composition comprised Al and Al/Si for alumina and silica-abraded zirconia. Conclusions. Particle size did not influence the SBS of the groups abraded exclusively with alumina or silica-coated particles. RelyX ARC was more surface-treatment dependent than RelyX U100 or Panavia F. (AU)

• Processo FAPESP: 11/14461-4 - Efeito de tratamentos de superfície na caracterização química superficial da zircônia e na resistência de união com diferentes cimentos
• Beneficiário: Renata Garcia Fonseca
• Modalidade de apoio: Auxílio à Pesquisa - Regular