title: Aluminum Oxide Sandblasting of Hexagonal Coping and Abutment: Influence on Retention and Marginal Leakage Using Temporary Cements.
abstract: OBJECTIVE
  To compare the tensile strength and marginal leakage of prefabricated abutments/copings, with or without surface sandblasting with aluminum oxide, luted with a calcium hydroxide-based temporary cement (CH, Dycal; Dentsply, Petrópolis, RJ, Brazil) or a noneugenol zinc oxide cement (ZO, Temp Bond NE; Kerr, Orange, CA).
  
  
  METHODS
  A total of 48 CeraOne abutment analogs and respective copings were divided into 6 groups (n = 8) according to the component that was sandblasted: the coping only, coping + abutment or no sandblasting and the temporary cement used: CH or ZO. After cementation, the samples underwent 500 thermal cycles (5°C ± 2°C and 55°C ± 2°C) and were subsequently immersed in an aqueous solution of 0.5% basic fuchsine dye for 24 hours. Next, the tensile test was performed, and microleakage was assessed qualitatively. Data were analyzed using Mann-Whitney, Kruskal-Wallis tests, followed by the Student-Newman-Keuls test (α = 0.05).
  
  
  RESULTS
  CH cement showed a tensile strength (245.6 N) significantly higher than that of the ZO (18.1 N). Sandblasting both abutment and coping increased tensile strength by 1.7 times. Marginal leakage was not influenced by sandblasting; however, CH presented less microleakage.
  
  
  CONCLUSIONS
  Aluminum oxide sandblasting of the coping and abutment favored the tensile strength of temporary cements and the CH showed a higher tensile strength and less microleakage than did the ZO cement.
authors.affiliation: *Research Assistant, Department of Operative Dentistry, São Leopoldo Mandic Institute and Dental Research Center, Campinas, São Paulo, Brazil. †Professor, Department of Molecular Biology, São Leopoldo Mandic Institute and Dental Research Center, Campinas, São Paulo, Brazil. ‡Professor, Department of Operative Dentistry, São Leopoldo Mandic Institute and Dental Research Center, Campinas, São Paulo, Brazil.
authors.forename: Jaime Yoshiaki
authors.initials: JY
authors.lastname: Okuyama
authors.forename: Rui Barbosa
authors.initials: RB
authors.lastname: de Brito
authors.forename: Fabiana Mantovani Gomes
authors.initials: FM
authors.lastname: França
mesh_terms: D000537:Aluminum Oxide / Q000627:therapeutic use; D002126:Calcium Hydroxide / Q000627:therapeutic use; D000044:Dental Abutments; D003738:Dental Cements / Q000627:therapeutic use*; D059605:Dental Implant-Abutment Design; D003763:Dental Leakage / Q000517:prevention & control*; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported / Q000379:methods; D003799:Dental Stress Analysis; D005054:Eugenol / Q000627:therapeutic use; D008903:Minerals / Q000627:therapeutic use; D013718:Tensile Strength; D015034:Zinc Oxide / Q000627:therapeutic use
chemical_list: D003738:Dental Cements; D008903:Minerals; D005054:Eugenol; C025702:Dycal; C076899:Temp-Bond; D000537:Aluminum Oxide; D002126:Calcium Hydroxide; D015034:Zinc Oxide