title: Machining human dentin by abrasive water jet drilling.
abstract: The aim of this experimental in-vitro study was to investigate the machining of human dentin using an abrasive water jet and to evaluate the influence of different abrasives and water pressures on the removal rate. Seventy-two human teeth had been collected after extraction and randomly divided into six homogeneous groups (n=12). The teeth were processed in the area of root dentin with an industrial water jet device. Different abrasives (saccharose, sorbitol, xylitol) and water pressures (15 or 25 MPa) were used in each group. Dimensions of dentin removal were analysed using a stripe projection microscope and both drilling depth as well as volume of abrasion were recorded. Morphological analyses of the dentin cavities were performed using scanning electron microscopy (SEM). Both drilling depth and volume of abrasion were significantly influenced by the abrasive and the water pressure. Depending on these parameters, the drilling depth averaged between 142 and 378 μm; the volume of abrasion averaged between 0.07 and 0.15 mm3. Microscopic images revealed that all cavities are spherical and with clearly defined margins. Slight differences between the abrasives were found with respect to the microroughness of the surface of the cavities. The results indicate that abrasive water jet machining is a promising technique for processing human dentin.
authors.affiliation: Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Hannover, Germany.
authors.forename: Philipp
authors.initials: P
authors.lastname: Kohorst
authors.affiliation: Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Hannover, Germany.
authors.forename: Sven
authors.initials: S
authors.lastname: Tegtmeyer
authors.affiliation: Institute of Materials Science, Leibniz University Hannover, Garbsen, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Biskup
authors.affiliation: Institute of Materials Science, Leibniz University Hannover, Garbsen, Germany.
authors.forename: Friedrich-Wilhelm
authors.initials: FW
authors.lastname: Bach
authors.affiliation: Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Hannover, Germany.
authors.forename: Meike
authors.initials: M
authors.lastname: Stiesch
mesh_terms: D003804:Dentin / Q000473:pathology* / Q000648:ultrastructure; D006801:Humans; D008855:Microscopy, Electron, Scanning; D011312:Pressure / Q000009:adverse effects*; D013012:Sorbitol / Q000009:adverse effects; D013395:Sucrose / Q000009:adverse effects; D014867:Water / Q000009:adverse effects*; D014993:Xylitol / Q000009:adverse effects
chemical_list: D014867:Water; D013012:Sorbitol; D013395:Sucrose; D014993:Xylitol
keywords: Water jet; abrasive; dentin; machining; removal rate; scanning electron microscopy