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dental material

cutting removing material by shearing-off process, results in somewhat smooth surface, accomplished by metal burs and hand instruments-burs usually made of carbon steel or tungsten carbide
abrasion wearing away of a surface, produces irregular grooves or scratches
recontouring reducing areas that are too bulky &/or overextended in order to blend with the normal contours of the tooth that has been restored
finishing process of producing the final shape and contour of a restoration-smooths overal surface of restorations to the tooth
polishing abrasion of a surface to reduce the size of the scratches until the surface appears shiny-high luster
abrasive material doing the wearing or abrading, may be on burs, disks, stones, wheels or strips abrasives may also be mixed with liquids to form a paste or slurry
Types of abrasives: chalk calcium carbonate-teeth, gold, amalgam restorations, plastics
Types of abrasives: Pumice volcanic glass-variety of grits: used in sealant placement: enamel, gold foil, dental amalgam, acrylic denture bases in labs
Types of abrasives: sand (quartz) bonded to paper disks for grinding metals and plastics
Types of abrasives: cuttle (quartz) bonded to paper disks for grinding metals and plastics
types of abrasives: garnet manganese, magnesium, iron, colbalt, aluminum-coated disks for plastics and metal alloys
types of abrasives: emery aka corundum, aluminum oxide-find on arbor bands that attach to a lab lathe for grinding custom trays and acrylic appliances
types of abrasives: aluminum oxide has replaced emery for several uses, disks and strips, rubber wheels and points; adjust enamel finish metal alloys and ceramic materials
types of abrasives: silex quartz -prophy paste-used on teeth in mouth
types of abrasives: tin oxide yucky taste-used for tarnished gold
types of abrasives: rouge iron oxide-polishing agent for gold and noble metal, only used in the lab setting-NOT IN THE MOUTH
bonded and coated abrasives used in dentistry: diamond burs diamond chips bonded to a shaft
bonded and coated abrasives used in dentistry: stones various shapes and sizes
bonded and coated abrasives used in dentistry: rubber wheels or points
bonded and coated abrasives used in dentistry: disks or strips abrasives bonded to pater metal or plastic disks and strips
bonded and coated abrasives used in dentistry: powders used in conjunction with water, alcohol, glycerin, mouthwash, brushes, rubber cups, felt cones or wheels, cloth wheels
factors affecting rate of abrasion: hardness harder abrasive particles=more abrasion: abrasives heat up objects being abrded during use=softens material=increased abrasion
factors affecting rate of abrasion: size larger particles (grit) produce deeper scratches=more abrasion
factors affecting rate of abrasion: shape irregularly shaped particles=more abrasion
factors affecting rate of abrasion: pressure increased pressure=more abrasion
factors affecting rate of abrasion:speed faster=more abrasion
factors affecting rate of abrasion: lubrication water is most used lubricant-paste/slurry
why do we polish-reduce adhesions smooth surface so plaque, stain and calculus won't stick as easily
why do we polish- make surface enamel feel smooth, increase esthetics-shiny
why do we polish-reduce corrosion and tarnish extends lifetime of restorations
process of polsihing when the surface acquires a smooth shiny layer it is considered polished. shiny layer is known as polish: fine scratches are filled in by the finer particulate being removed from the surface-this layer=microcrystalline aka polish layer or Beilby layer
rationale for amalgam polishing (we don't do it anymore) refine anatomy & occlusion, eliminate surface irregularities, eliminate overhangs & undercontoured proximal surfaces-create a smooth shiny surface that is asthetically pleasing
contraindications of amalgam polishing fractures present (in amalgam)-open margins-recurrent decay-less than 24 hrs since plcmt (low copper b/c it must finish setting up)-spherical high copper can be finished in the same apt
precautions when amalgam polishing must maintain centric occlusal contacts(don't alter occlusion): avoid excessive heat-could damage pulp, excess heat brings mercury to the surface of amalgam-WEAKENS RESTORATION AND RELEASES VAPORS
determining marginal adequacy margins of amalgam should be flush with the tooth surface
supramarginal restoration w/o overextension extends straight up
supramarginal restoration w/ overextension of amalgam goes up and over the tooth surface
submarginal below the margin
adjusting enamel use finishing bur to resolve submarginal discrepancy of 0.2mm or less
open margin gap between tooth structure and amalgam
overcontoured (or undercarved) lump in amalagam
undercontoured or (overcarved) too deep, must to it over
impregnated rubber points/ cupts system (Shofu) brownie-greenie-supergreenie
margination process of eliminating submarginal discrepancies
what distinguishes the green point and cup from the supergreen? yellow band on supergreenie
when using a bur which way should it be moved tooth to amalgam
Created by: jfgwinn