A comparison of wire- and Kevlar-reinforced provisional restorations.
Stainless steel wire 0.036 inch in diameter was compared with Kevlar 49 polyaramid fiber as a means of reinforcing a four-unit posterior provisional fixed restoration with 2 pontics. Three reinforcement patterns for wire and two for Kevlar 49 were evaluated and compared with the control, which was an unreinforced provisional restoration. A central tensile load was placed on the cemented provisional restoration and the variables were measured: (1) the initial stiffness; (2) the load at initial fracture; and (3) the unit toughness, or the energy stored in the beam at a point where the load had undergone a 1.0-mm deflection. Statistical analysis showed (1) the bent wire configuration had a significantly higher initial stiffness (P < or = .05), (2) there was no difference between designs for load at initial fracture, and (3) the bent wire had a significantly higher unit toughness value (P < or = .05).
Powell
D B
DB
Department of Restorative Dentistry, University of Washington, Seattle 98195.
Nicholls
J I
JI
Yuodelis
R A
RA
Strygler
H
H
D000704:Analysis of Variance; D003799:Dental Stress Analysis; D003779:Denture Design; D003833:Denture, Partial, Temporary; D006801:Humans; D008422:Materials Testing; D011108:Polymers; D013193:Stainless Steel
C039578:Kevlar Aramid fibers; D011108:Polymers; D013193:Stainless Steel