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Quintessence Int 38 (2007), No. 9     31. Aug. 2007
Quintessence Int 38 (2007), No. 9  (31.08.2007)

Online Article, Page 797, PubMed:17873972


Online Article: Diametral tensile strength of dual-curing resin cements submitted exclusively to autopolymerization
Fonseca, Renata Garcia / Artusi, Thais Paci / Santos, Juliana Gomes dos / Adabo, Gelson Luis
Objectives: To evaluate, at different times, the diametral tensile strength (DTS) of dual-curing resin cements that were not photopolymerized.
Method and Materials: Equal amounts of base and catalyst pastes of Panavia F (Kuraray), Variolink II (Vivadent), Rely X (3M ESPE), and Enforce (Dentsply) were mixed and inserted into cylindrical molds (4 3 2 mm) (n = 10). Cements were not photopolymerized. DTS test was performed in a testing machine at 30 minutes, 1 hour, 24 hours, and 7 days. The specimens were stored in light-proof containers with distilled water at 37°C until the time of assay. An autopolymerizing resin cement (Cement-It, Jeneric Pentron) and a zinc phosphate cement served as controls. One-way analysis of variance (ANOVA) and Tukey test were performed separately for each cement and for each time (P < .05).
Results: All cements showed an increase in DTS when tested at 1 and 24 hours. Tests at 24 hours and 7 days revealed no statistically significant differences. In all groups, the zinc phosphate cement had the lowest DTS mean values (2.1 MPa, 3.6 MPa, 6.5 MPa, and 6.9 MPa), while Cement-It (35.1 MPa, 33.6 MPa, 46.9 MPa, and 46.3 MPa) and Enforce (31.9 MPa, 31.7 MPa, 43.4 MPa, and 47.6 MPa) presented the highest DTS mean values.
Conclusion: All cements presented maximal strength at 24 hours. The dual-curing resin cements, even when nonphotopolymerized, demonstrated higher DTS than the zinc phosphate cement and similar or lower values than the autopolymerizing resin cement.

Keywords: autopolymerization, diametral tensile strength, dual-curing resin cements, mechanical properties, metallic restorations, polymerization modes