Parapulpal pins and their effects on the fracture resistance of pin-retained cores.
The bending characteristics of various parapulpal pins, the retention of a parapulpal pin in different core buildup materials, and the fracture resistance of pin-retained cores were investigated in an in-vitro study. In amalgam and composite cores, the use of parapulpal pins produced an increase in fracture resistance. The highest fracture resistance values were observed in amalgam cores, and the lowest fracture strength was exhibited by cores of glass ionomer cements (GICs) containing metallic particles. The different parapulpal pins and their flexural rigidity had little effect on the fracture resistance of the pin-retained cores. For extensive pin-retained cores it appears advisable to use GICs with restraint and, particularly in the case of large-scale bridge reconstructions, only after critical examination of the loading conditions.
Haller
B
B
Department of Operative Dentistry and Periodontology, University of Würzburg, Germany.
Götze
W
W
Weiss
G
G
D000497:Alloys; D002858:Chromium Alloys / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003723:Dental Amalgam / Q000737:chemistry; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry; D003772:Dental Pins; D003793:Dental Restoration, Permanent; D004548:Elasticity; D004867:Equipment Design; D004868:Equipment Failure; D005899:Glass Ionomer Cements / Q000737:chemistry; D008422:Materials Testing; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
D000497:Alloys; D002858:Chromium Alloys; D003188:Composite Resins; D003764:Dental Materials; D005899:Glass Ionomer Cements; C031462:titanium alloy (TiAl6V4); D003723:Dental Amalgam; D014025:Titanium