title: Mechanical properties of direct core build-up materials.
abstract: OBJECTIVE
  This work was undertaken to measure mechanical properties of a diverse group of materials used for direct core build-ups, including a high copper amalgam, a silver cermet cement, a VLC resin composite and two composites specifically developed for this application.
  
  
  METHODS
  Compressive strength, elastic modulus, diametral tensile strength and flexural strength and modulus were measured for each material as a function of time up to 3 months, using standard specification tests designed for the materials.
  
  
  RESULTS
  All the materials were found to meet the minimum specification requirements except in terms of flexural strength for the amalgam after 1 h and the silver cermet at all time intervals.
  
  
  CONCLUSIONS
  There proved to be no obvious superior material in all respects for core build-ups, and the need exists for a specification to be established specifically for this application.
authors.affiliation: Turner Dental School, University Dental Hospital of Manchester, UK. combe001@gold.tc.umn.edu
authors.forename: E C
authors.initials: EC
authors.lastname: Combe
authors.forename: A M
authors.initials: AM
authors.lastname: Shaglouf
authors.forename: D C
authors.initials: DC
authors.lastname: Watts
authors.forename: N H
authors.initials: NH
authors.lastname: Wilson
mesh_terms: D000704:Analysis of Variance; D016722:Cermet Cements / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D019245:Compressive Strength; D003722:Dental Alloys / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D004548:Elasticity; D008422:Materials Testing; D018583:Pliability; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry; D018709:Statistics, Nonparametric; D013718:Tensile Strength
chemical_list: D016722:Cermet Cements; D003188:Composite Resins; C400043:Coradent; D003722:Dental Alloys; D003764:Dental Materials; D019279:Resin Cements; C072650:Duralloy; C073466:Prisma APH; C079578:Ti-Core composite resin