The repeatability of human dentine permeability measurement in vitro.
OBJECTIVE
The aim of this study was to determine the repeatability of apparatus designed to assess dentine permeability at two different pressures.


METHODS
Forty-five human coronal tooth portions were prepared and permeability was measured at two separate time points, 5h apart, at 14 cm H2O pressure and then at 100 cm H2O pressure. Repeatability was determined using the limits of agreement (LOA) method.


RESULTS
The results showed equal mean permeability of 0.6 microl at both time 1 and time 2 at 14 cm H2O pressure, and 2.7 and 2.5 microl at time 1 and time 2, respectively, at 100 cm H2O pressure. At 14 cm H2O pressure, the LOA were (-0.4, 0.4)microl and at 100 cm H2O pressure the LOA were (-0.2, 0.6)microl.


CONCLUSIONS
Although repeatability measurement at 14 cm H2O pressure appeared to be acceptable, the higher permeability values at 100 cm H2O pressure may make the latter the pressure of choice despite the small bias.
Elgalaid
Taher O
TO
Glasgow Dental Hospital and School, 378 Sauchiehall Street, Glasgow G2 3JZ, UK. taher33@hotmail.com
Creanor
Steve L
SL
Creanor
Siobhan
S
Hall
Andrew F
AF
D003762:Dental Instruments; D003804:Dentin / Q000187:drug effects / Q000601:surgery; D003806:Dentin Permeability; D004867:Equipment Design; D006801:Humans; D008963:Molar / Q000737:chemistry; D011312:Pressure; D014867:Water
D014867:Water