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Brazilian Journal of Oral Sciences
versão On-line ISSN 1677-3225
Braz. J. Oral Sci. vol.9 no.2 Piracicaba Abr./Jun. 2010
ORIGINAL ARTICLE
Influence of preparation height and luting agent type on crown retention in molars
Marcelo MarchioriI; Cezar Augusto GarbinII; Lilian RigoIII; Daniel Becker NunesI; Genaro Marcial Mamani GilapaIV
ISpecialist in Dental Prosthesis, Postgraduate Program, Dental school, Uningá, Brazil
IIPhD, Dental School, University of Pernambuco; Coordinator of the Postgraduate Program, Dental School, Uningá, Brazil
IIIPhD, Dental School, University of Pernambuco; Professor of Scientific Methodology, Postgraduate Program, Dental school, Uningá, Brazil
IVPhD, Professor, Electromechanical Production Engineering Course, Federal Technological University of Paraná, Brazil
ABSTRACT
AIM: Mechanical characteristics of the preparation along with luting agent are significant elements on the maintenance of fixed prostheses. This study aimed at assessing the retention of metal complete crowns luted with two different luting agents under different preparation height.
METHODS: Forty human third molars were selected and prepared to receive total crowns, and were randomly divided in 4 groups: (1) 5-mm preparation height (PH) and RelyX U100 self-adhesive resin cement (SA); (2) 5-mm PH and zinc phosphate (ZP); (3) 3-mm PH and SA; and (4) 3-mm PH and ZP. Crowns were cast in nickel-chromium alloy. The tensile strength was tested in a universal testing machine.
RESULTS: Mean tensile strength values to crown displacement (kgf) and standard deviation were 39.6 (13.0) for group 1; 16.9 (8.1) for group 2; 32.2 (7.9) for group 3; and 10.6 (3.2) for group 4. Overall, the crowns cemented with SA presented significantly higher mean tensile strength values than ZP, and the 5-mm PH presented significantly higher mean tensile strength values than 3-mm PH.
CONCLUSIONS: The self-adhesive resin cement and higher preparation height improved crown retention.
Keywords: crown retention, luting agents, preparation design.
Full text available only in PDF format.
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Correspondence to:
Lilian Rigo
Av. Major João Schell, 1121
Vila Santa Terezinha
Passo Fundo, RS – CEP 99020-020
Phone: +55 (54) 33131081
E-mail: lilianrigo@via-rs.net
Received for publication: October 27, 2009
Accepted: June 16, 2010
