title: Resistance to condensation of 'condensable' resin composites as evaluated by a mechanical test.
abstract: This study compared the resistance-to-condensation forces of recently introduced condensable resin composites to that of amalgams and conventional resin composites. Using the flat platens of a servohydraulic testing machine, cylindrical specimens of each material 2.8 mm in diameter and 5.5 mm in length were compressed diametrally over two seconds to a thickness of 0.75 mm. Peak forces generated during compression were recorded. This method ranked the various classes of restorative material for resistance to condensation in the same order as most clinicians subjectively reported, with the highest forces observed with admixed dental amalgams, followed in order by spherical amalgams, condensable resin composites and conventional resin composites. Although peak forces observed with the condensable resin composites were generally higher than those observed with conventional resin composites, these were significantly lower than the peak forces observed with amalgams.
authors.affiliation: Section of Operative Dentistry, Department of Adult Restorative Dentistry, University of Nebraska Medical Center, College of Dentistry, 40th and Holdrege Streets, PO Box 830740, Lincoln, NE 68583-0750, USA.
authors.forename: W W
authors.initials: WW
authors.lastname: Brackett
authors.forename: D A
authors.initials: DA
authors.lastname: Covey
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D003722:Dental Alloys / Q000737:chemistry; D003723:Dental Amalgam / Q000737:chemistry; D003799:Dental Stress Analysis / Q000295:instrumentation; D006801:Humans; D008422:Materials Testing; D011312:Pressure; D012822:Silicon Dioxide; D013223:Statistics as Topic; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D015040:Zirconium
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; C113049:Solitaire composite resin; C403464:SureFil packable composite; C083568:Z100 composite resin; C033470:Dispersalloy; C031360:Sybraloy; D012822:Silicon Dioxide; D003723:Dental Amalgam; C039734:Durafill; C095809:Contour (dental amalgam); D015040:Zirconium