title: Shear bond strength of resin cement bonded to alumina ceramic after treatment by aluminum oxide sandblasting or silica coating.
abstract: OBJECTIVE
  To evaluate the shear bond strength and bond durability between a dual-cured resin cement (RC) and a high alumina ceramic (In-Ceram Alumina), subjected to two surface treatments.
  
  
  METHODS
  Forty disc-shaped specimens (sp) (4-mm diameter, 5-mm thick) were fabricated from In-Ceram Alumina and divided into two groups (n = 20) in accordance with surface treatment: (1) sandblasting by aluminum oxide particles (50 μm Al(2) O(3) ) (SB) and (2) silica coating (30 μm SiO(x) ) using the CoJet system (SC). After the 40 sp were bonded to the dual-cured RC, they were stored in distilled water at 37°C for 24 hours. After this period, the sp from each group were divided into two conditions of storage (n = 10): (a) 24 h-shear bond test 24 hours after cementation; (b) Aging-thermocycling (TC) (12,000 times, 5 to 55°C) and water storage (150 days). The shear test was performed in a universal test machine (1 mm/min).
  
  
  RESULTS
  ANOVA and Tukey (5%) tests noted no statistically significant difference in the bond strength values between the two surface treatments (p = 0.7897). The bond strengths (MPa) for both surface treatments reduced significantly after aging (SB-24: 8.2 ± 4.6; SB-Aging: 3.7 ± 2.5; SC-24: 8.6 ± 2.2; SC-Aging: 3.5 ± 3.1).
  
  
  CONCLUSIONS
  Surface conditioning using airborne particle abrasion with either 50 μm alumina or 30 μm silica particles exhibited similar bond strength values and decreased after long-term TC and water storage for both methods.
authors: Department of Dental Materials and Prosthodontics, São Paulo State University, São José dos Campos, Brazil. sheilapestana@hotmail.com
authors: Sheila Pestana
authors: SP
authors: Passos
authors: Luiz Felipe
authors: LF
authors: Valandro
authors: Marco Antonio
authors: MA
authors: Bottino
authors: Maria Jacinta Moraes Coelho
authors: MJ
authors: Santos
authors: Gildo Coelho
authors: GC
authors: Santos
mesh_terms: D020906:Air Abrasion, Dental; D000537:Aluminum Oxide; D020099:Coated Materials, Biocompatible; D001840:Dental Bonding; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D006358:Hot Temperature; D006868:Hydrolysis; D008422:Materials Testing; D019279:Resin Cements; D033081:Shear Strength; D012822:Silicon Dioxide; D013499:Surface Properties
chemical_list: D020099:Coated Materials, Biocompatible; C483026:In-Ceram Alumina; D019279:Resin Cements; D003776:Dental Porcelain; D012822:Silicon Dioxide; D000537:Aluminum Oxide