Mechanical properties of direct core build-up materials.
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.
Combe
E C
EC
Turner Dental School, University Dental Hospital of Manchester, UK. combe001@gold.tc.umn.edu
Shaglouf
A M
AM
Watts
D C
DC
Wilson
N H
NH
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
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