In Vitro Tensile Strength of Luting Cements on Metallic Substrate

Abstract

The aim of this study was to determine the tensile strength of crowns cemented on metallic substrate with four different types of luting agents. Twenty human maxillary molars with similar diameters were selected and prepared to receive metallic core castings (Cu-Al). After cementation and preparation the cores were measured and the area of crown's portion was calculated. The teeth were divided into four groups based on the luting agent used to cement the crowns: zinc phosphate cement; glass ionomer cement; resin cement Rely X; and resin cement Panavia F. The teeth with the crowns cemented were subjected to thermocycling and later to the tensile strength test using universal testing machine with a load cell of 200 kgf and a crosshead speed of 0.5 mm/min. The load required to dislodge the crowns was recorded and converted to MPa/mm(2). Data were subjected to Kruskal-Wallis analysis with a significance level of 1%. Panavia F showed significantly higher retention in core casts (3.067 MPa/mm(2)), when compared with the other cements. Rely X showed a mean retention value of 1.877 MPa/mm(2) and the zinc phosphate cement with 1.155 MPa/mm(2). Glass ionomer cement (0.884 MPa/mm(2)) exhibited the lowest tensile strength value. Crowns cemented with Panavia F on cast metallic posts and cores presented higher tensile strength. The glass ionomer cement showed the lowest tensile strength among all the cements studied.

Effect of GLUMA desensitizer on the retention of full metal crowns cemented with Rely X U200 self-adhesive cement

“…Retention is an important factor in determining the success and clinical service of FPDs 1. The retention of crown is based on the presence of two almost parallel vertical surfaces from tooth preparation; Al-Omari et al suggested that the mean convergence angle between 22.4 and 25.3 degrees was clinically acceptable 2.…”

Shear bond strength of luting cements to fixed superstructure metal surfaces under various seating forces

“…GIC has low tensile strength and fracture resistance and the studies confirmed that it establishes no chemical bond with noble metal alloys. 2 28 45 46 However, it has been reported that the passive oxide layer formed on the surface increases the bond strength of glassionomer cements to base metal alloys. 47 These reports correlate with the results of our study.…”

Tensile Strength of Resin Cements Used with Base Metals in a Simulating Passive Cementation Technique for Implant-Supported Prostheses

“…The oxide layer formed over cp titanium produces a firm oxide adherent layer that does not influence the bond strength of self-adhesive resin cements (25). However, the bond strength of the cements varies depending on the prosthodontic substrate, indicating that selection of these cements should be dictated by the substrate (26) Certain properties of resin cements compared are superior to other types of cements, like greater fracture resistance (18,27,28), good adherence to dental structures and alloys provided by adhesive systems (29,30), low solubility in oral fluids, in addition to the reduced leakage in restorations (29), make the resin cements agents of choice for cementation. It is claimed that there is no established value of load considered ideal for clinical success of prosthesis retention (30).…”