title: In vitro evaluation of dynamic fluid displacement in dentinal tubules activated on pin placement.
abstract: The use of cemented, friction-lock, and self-threading pins for improving retention has been essential for treatment in restorative dentistry, with the self-threading pin considered to be the most retentive. Cavity varnish has been suggested to prevent microleakage around pins. This study investigated the insertion of a self-threading pin when the pinhole was filled with a liquid dye. The results showed that pinholes filled with dye before pin placement had measurable dye displacement. Pinholes without pins displayed no measurable dye displacement through the dentin; this was also true when the dye fluid was removed before the pin placement. However, the dye in pinholes was displaced toward the path of least resistance, and fluid in a pinhole can contribute to crazing of the dentin during placement.
authors.affiliation: Department of Restorative Dentistry, University of Texas Health Science Center, Dental School, San Antonio.
authors.forename: T
authors.initials: T
authors.lastname: Hummert
authors.forename: D
authors.initials: D
authors.lastname: Kaiser
mesh_terms: D003763:Dental Leakage / Q000473:pathology; D003772:Dental Pins; D003782:Dental Pulp / Q000648:ultrastructure; D003804:Dentin / Q000502:physiology / Q000648:ultrastructure*; D005069:Evaluation Studies as Topic; D006801:Humans; D011312:Pressure; D012212:Rheology; D012394:Rosaniline Dyes; D013499:Surface Properties
chemical_list: D012394:Rosaniline Dyes; C025485:basic fuchsin