title: Effect of restorative materials on cuspal flexure.
abstract: The purposes of this study were (1) to establish a methodology for determining surface strains in two locations of the same tooth under intact, prepared, and restored conditions and (2) to compare the effects on stiffness of different restorative materials in a tooth subjected to cuspal loading. Two linear strain gauges were mounted on each of 30 extracted maxillary premolar teeth. Teeth were mounted in poly(methyl methacrylate) resin and randomly assigned to one of three study groups according to the restorative material and application technique to be used. Statistical analysis indicated a statistically significant interaction between restorative material and tooth condition at both proximal and buccal sites and a statistically significant difference in stiffness between teeth restored with Tenure/Marathon V and those restored with either amalgam or Scotchbond 2/P-50 at the proximal site. Results suggest that the methods employed provide a useful, nondestructive means of testing the same tooth under various conditions.
authors.affiliation: Department of Mechanical and Aerospace Engineering, State University of New York at Buffalo, School of Engineering and Applied Sciences, USA.
authors.forename: J
authors.initials: J
authors.lastname: Medige
authors.forename: Y
authors.initials: Y
authors.lastname: Deng
authors.forename: X
authors.initials: X
authors.lastname: Yu
authors.forename: E L
authors.initials: EL
authors.lastname: Davis
authors.forename: R B
authors.initials: RB
authors.lastname: Joynt
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid / Q000502:physiology*; D017438:Bisphenol A-Glycidyl Methacrylate; D001732:Bite Force; D003188:Composite Resins; D003722:Dental Alloys; D003723:Dental Amalgam; D003793:Dental Restoration, Permanent / Q000009:adverse effects* / Q000379:methods; D003799:Dental Stress Analysis; D006801:Humans; D016014:Linear Models; D008422:Materials Testing; D008689:Methacrylates; D011897:Random Allocation; D019279:Resin Cements; D014082:Tooth Fractures / Q000209:etiology*
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; D008689:Methacrylates; D019279:Resin Cements; C074670:Marathon composite resin; C065771:P50 composite resin; C067788:scotchbond 2; C074811:Tenure adhesive; D017438:Bisphenol A-Glycidyl Methacrylate; D003723:Dental Amalgam; C072894:Valiant PhD