The stress reducing capacity of unfilled resin in a Class V cavity.
This study examined the stress reducing capacity of varying thicknesses of unfilled resin in a Class V cavity. A two dimensional plane strain mesh of a Class V cavity, 3 mm in diameter and 2 mm deep, was produced and the thickness of the unfilled resin layer was varied from 0 to 80 microm. A polymerization shrinkage of 1.5% was applied to the composite resin and the interfacial forces examined. The maximum shear stresses were found to occur along the pulpal floor of the restoration at the unfilled resin-dentine interface. The maximum shear stress values varied from 11.1 to 22.4 MPa and the shear stresses decreased by up to 38% as the thickness of the unfilled resin increased to 80 microm.
Rees
J S
JS
Department of Restorative Dentistry, University of Bristol Dental School, UK.
O'Dougherty
D
D
Pullin
R
R
D003188:Composite Resins; D003198:Computer Simulation; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D003804:Dentin; D020342:Finite Element Analysis; D006801:Humans; D008422:Materials Testing; D008962:Models, Theoretical; D011108:Polymers / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry*; D013314:Stress, Mechanical; D013718:Tensile Strength
D003188:Composite Resins; D011108:Polymers; D012117:Resins, Synthetic