Micro-morphological changes prior to adhesive bonding: high-alumina and glassy-matrix ceramics

• Main Authors: Marco Cícero Bottino (Author), Mutlu Özcan (Author), Paulo Guilherme Coelho (Author), Luiz Felipe Valandro (Author), José Carlos Bressiani (Author), Ana Helena Almeida Bressiani (Author)
• Format: Book
• Published: Sociedade Brasileira de Pesquisa Odontológica, 2008-06-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.
• Notes: 10.1590/S1806-83242008000200011; 1806-8324
• Keywords: Air abrasion; dental; Hydrofluoric acid; Acid etching; dental; Ceramics; Dentistry; RK1-715
• Source: Brazilian Oral Research, Vol 22, Iss 2, Pp 158-163 (2008)

The aim of this study was to qualitatively demonstrate surface micro-morphological changes after the employment of different surface conditioning methods on high-alumina and glassy-matrix dental ceramics. Three disc-shaped high-alumina specimens (In-Ceram Alumina, INC) and 4 glassy-matrix ceramic specimens (Vitadur Alpha, V) (diameter: 5 mm and height: 5 mm) were manufactured. INC specimens were submitted to 3 different surface conditioning methods: INC1 - Polishing with silicon carbide papers (SiC); INC2 - Chairside air-borne particle abrasion (50 µm Al2O3); INC3 - Chairside silica coating (CoJet; 30 µm SiOx). Vitadur Alpha (V) specimens were subjected to 4 different surface conditioning methods: V1 - Polishing with SiC papers; V2 - HF acid etching; V3 - Chairside air-borne particle abrasion (50 µm Al2O3); V4 - Chairside silica coating (30 µm SiOx). Following completion of the surface conditioning methods, the specimens were analyzed using SEM. After polishing with SiC, the surfaces of V specimens remained relatively smooth while those of INC exhibited topographic irregularities. Chairside air-abrasion with either aluminum oxide or silica particles produced retentive patterns on both INC and V specimens, with smoother patterns observed after silica coating. V specimens etched with HF presented a highly porous surface. Chairside tribochemical silica coating resulted in smoother surfaces with particles embedded on the surface even after air-blasting. Surface conditioning using air-borne particle abrasion with either 50 µm alumina or 30 µm silica particles exhibited qualitatively comparable rough surfaces for both INC and V. HF acid gel created the most micro-retentive surface for the glassy-matrix ceramic tested.