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Radiodensity Restorative Material - Dental Ceramic, BDS SCENARIO 13,…
Radiodensity Restorative Material - Dental Ceramic
Radiodensity
Radiolucent
Less dense structure which allow x-ray beam to pass through
appears dark/black
Radiopaque
structure that do not allow x-ray beam to pass through
appears white
Radiodensity of Restorative materials
indirect
Stainless steel
some appear "see through"
Gold crown
radiopaque with smooth contours & regular borders
Acrylic
least dense, slightly radiopaque & most radiolucent
Metal porcelain
metal -> radiopaque, porcelain -> slightly radiopaque
All ceramic
slightly radiopaque
direct
Amalgam filling
radiopaque
Glass Ionomer Cement
radiopaque but not as amalgam
Composite resin
radiolucent (partially)
Temporary fillings
radiopaque but more translucent than metal
Dental Ceramic
definition
ceramic material that exhibits adequate strength, durability, and color that is used intraorally to restore anatomic form and function and esthetics
usage
inlays onlays, Single crowns, Ceramic orthodontic brackets, Short span bridges, veneers, metal ceramics, Artificial denture teeth
properties
mechanical properties
high compressive strength
low tensile strength
stiff and brittle
high hardness
physical properties
good thermal insulators
CTE: 12 x 10^-6/ºC
translucent (glassy ceramics)
opaque (crystalline ceramics)
Biological properties
biocompatible
chemical properties
chemically inert
remain stable over long time periods
classification
Indication
Feldspathic porcelain, aluminous porcelain, leucite glass-ceramic, lithium disilicate glass-ceramic, alumina, glass-infiltrated spinel, glass-infiltrated, glass-infiltrated alumina, glass-infiltrated zirconia, zirconia
Firing temperature
high-fusing, medium-fusing, low-fusing, ultralow fusing
Fabrication technique
Stacking
condensation
Sintering
cooling
composition
feldspar
glass-matrix formation, acts as binder of other component
kaolin
acts a s binder and increase moldability
quartz
high fusion temp., adds strength and hardness
phase
Silicate Glass/ Amorphous pahse
SiO2 forming (SiO4)4-, silicate glass contains metal cations as modifiers or fluxers
Crystal Phase
ionic compounds, binary arrangement (Al2O3 or ZrO2), compounds with 1 O useful as fluxer and with formula X2O3 useful as stabilizers
BDS SCENARIO 13
Vivian (2106717783)