title: Retention of crowns cemented on implant abutments with temporary cements.
abstract: This study was to examine the retentive force of crowns to implant abutments with commercial temporary cements. Six different temporary cements were investigated. Cast crowns were cemented to the abutments using each cement and their retentive forces to abutments were determined 7 or 28 days after cementing (n=10). The retentive force of the cements to abutments varied widely among the products [27-109 N (7-day), 18-80 N (28-days)]. The retentive force of all the cements was not reduced as the time elapsed, except for two products tested. The polycarboxylate cements and paste-mixing type eugenol-free cements revealed comparable retentive force after 28 days of storage. The powder-liquid type cements showed a positive correlation (p<0.05) between the retentive force and the shear strength, while a negative correlation (p<0.05) was obtained for paste-mixing type cement between the retentive force and compressive strength. Mechanical strength of temporary cements could not be a prominent predicting factor for retention of the crowns on the abutments.
authors.affiliation: Division of Dental Biomaterials Science, Department of Restorative and Biomaterials Sciences, Meikai University School of Dentistry.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Nagasawa
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Hibino
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nakajima
mesh_terms: D003442:Crowns; D000044:Dental Abutments; D003738:Dental Cements / Q000737:chemistry*; D017268:Dental Prosthesis Retention; D003799:Dental Stress Analysis; D005054:Eugenol / Q000737:chemistry; D008422:Materials Testing; D013499:Surface Properties; D015034:Zinc Oxide / Q000737:chemistry; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: D003738:Dental Cements; C078077:Freegenol; C534026:HY-Bond Zinc; D005054:Eugenol; C076899:Temp-Bond; D015036:Zinc Phosphate Cement; D015034:Zinc Oxide