| 0273 Core Rebuilding Using Quartz/Carbon Fiber Posts: in Vitro Study | ||
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L. ROVATTI1, A. DALLARI1, B. DALLARI2, and P.N. MASON3, 1 University of Verona, Modena, Italy, 2 CLOPD University of Modena- Reggio Emilia, Italy, 3 University of Padova, Mestre (VE), Italy The possibility of using quartz fiber endodontic posts instead of carbon fiber post also in the rebuildings of molar teeth is still under investigation.Objectives:the aim of this in vitro study is to evaluate the resistance to 90° applied forces of composite cores rebuilt by using 1 or 3 carbon fiber posts and 1 or 3 quartz fiber posts.Methods:20 model teeth (Frasaco AG-3ZPUK-46),divided into 4 groups of 5 elements were sectioned at the same level and rebuilt with composite under identical forms(Composipost Core Form, RTD)using fiber-reinforced posts as following:Group A:1 carbon fiber post (Endocomposipost, RTD).Group B:1 quartz fiber post(Endolightpost,RTD).Group C:3 carbon fiber posts.Group D:3 quartz fiber posts.Shear Bond Strength Test(SBST)with Instron machine was performed with forces perpendicular to long axis ofteeth.Results:the average resistence was:Group A:10.03 MPa.Group B:18.43 MPa.Group C:20.80 MPa. Group D:32.10 MPa. Conclusion:1)a higher resistance to SBST of composite cores built onto quartz fiber posts is evident;2)using 3 instead of 1 carbon fiber post the resi-stance is doubled;3)using 3 instead of 1 quartz fiber post the resistance increases of 75%.The above results suggest that the use of 3 quartz fiber posts in composite rebuildings of molar teeth leads to the highest resistance to 90°-applied loads,and seems to be the right choice in complex post-endodontic restorations.
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| Seq #27 - Dental Materials: Bonding, Posts 2:00 PM-3:30 PM, Friday, 27 August 2004 Crowne Plaza Hotel SEDIR II | ||
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