Measurement of hydrostatic pressures during simulated post cementation.
Tooth sensitivity and fracture after cementation of posts for endodontically treated teeth have been a problem. This investigation developed an in vitro method of measuring intraradicular hydrostatic pressures created during simulated post cementation. The testing apparatus consisted of a pressure transducer and brush recorder connected to precision milled post spaces in a Plexiglas block. Cast post and cores were fabricated and cemented with three different luting agents: resinous cement, glass ionomer cement, and zinc phosphate cement. Mean hydrostatic pressures (psi) recorded during post cementation were zinc phosphate cement, 22.67; resinous cement, 19.77; and glass ionomer cement, 17.66. Zinc phosphate cement created substantially greater hydrostatic pressures than either the resinous or glass ionomer cements. This in vitro system was capable of discriminating intraradicular hydrostatic pressures among different classes of luting agents.
Morando
G
G
Naval Dental School, Bethesda, Md. USA.
Leupold
R J
RJ
Meiers
J C
JC
D000704:Analysis of Variance; D002484:Cementation / Q000009:adverse effects; D003738:Dental Cements / Q000009:adverse effects / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation* / Q000379:methods; D003807:Dentin Sensitivity / Q000209:etiology / Q000503:physiopathology; D005899:Glass Ionomer Cements; D006801:Humans; D006874:Hydrostatic Pressure; D008277:Magnesium Oxide; D008961:Models, Structural; D011076:Polycarboxylate Cement; D011176:Post and Core Technique / Q000009:adverse effects; D012117:Resins, Synthetic; D014082:Tooth Fractures / Q000209:etiology / Q000503:physiopathology; D014092:Tooth Root / Q000503:physiopathology; D014160:Transducers, Pressure; D015034:Zinc Oxide; D015036:Zinc Phosphate Cement
D003738:Dental Cements; D005899:Glass Ionomer Cements; D011076:Polycarboxylate Cement; D012117:Resins, Synthetic; D008277:Magnesium Oxide; D015036:Zinc Phosphate Cement; C040235:Ketac-cem; D015034:Zinc Oxide