Diametral tensile strength of micro-hybrid composite resins

*0585 Diametral tensile strength of micro-hybrid composite resins*
G.C. LOPES¹, J. ZUCCO², C. DE LUCCA³, L. BARATIERI², and L. VIEIRA⁴, ¹Universidade do Sul de Santa Catarina, NUPEBIO, Universidade Federal de Santa Catarina, Florianópolis, Brazil, ²Universidade Federal de Santa Catarina, Florianópolis, Brazil, ³Universidade Federal De Santa Catarina, Florianópolis, Brazil, ⁴Universidade do Sul de Santa Catarina, Florianópolis, Brazil Objective: To evaluate the diametral tensile strength (DTS) of micro-hybrid composite. Methods: Cylindrical specimens of composite resins were prepared from a split metal mould bipartite of 4mm diameter x 6mm high. Each composite were inserted until completed foal the cylinder (n=8). A polyester matrix was positioned behind the composite resin and the photo-polymerization done during 40 seconds each increment of 2mm (600mW/cm2). The composite resins tested were: Z-250(Z2.3M), Arabesk(Ar.Voco), Miris(Mi.Coltène), Vitalescence(Vi.Ultradent), NaturalLook(Na.DFL), EsthetX(Ex.Dentsply), Point4(P4.Kerr), Venus(Ve.Kulzer), Prodigy(Pr.Kerr), TetricCeram(Tc.Vivadent). Two microfill resin composites [A110(Al.3M) and Micronew(Mn.Bisco)] and one nanofilled [Supreme (Su.3M)] were take as negative control. A hybrid resin was used as positive control [(Clearfil AP-X (AP.Kuraray)]. The cylinders were stored in water for 24 hours and positioned horizontally between two metallic bases in a universal test machine (Instron 4444) with a compressive force at 1mm/min. Data were analyzed with one-way ANOVA and Scheffé (p<0.05%). Results: The DTS [mean(±SD)] were: Su=49.9±3.8a, Z2=48.1±6.7a, Ap=47.0±4.0a, Tc=45.7±2.8ab, Vi=45.1±6.4ab, Ex=44.6±6.6ab, Na=43.5±4.3ab, Ve=43.3±8.5ab, P4=43.2±4.4ab, Mn=39.8±6.8abc, Pr=38.8±6.1bc, Ar=38.2±8.4bc, Mi=37.2±6.9bc, A1=31.9±6.6c. Means with the same letter are not statistically different at p<0.05. Conclusion: The difference in filler rate or compositional characteristics may be more important on its DTS than size and distribution filler characteristics of composite resins tested.
Seq #78 - Composition, Physical Properties, and Fatigue 10:15 AM-11:30 AM, Thursday, 11 March 2004 Hawaii Convention Center Exhibit Hall 1-2
Back to the Dental Materials: VI - Polymer Materials-Mechanical Properties and Degradation Program Back to the IADR/AADR/CADR 82nd General Session (March 10-13, 2004)
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