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Indirect Metal restoration & Radio anatomy, Dyandra Wirahana Hasan -…
Indirect Metal restoration & Radio anatomy
Radio Anatomy
Normal structure of OCF in radioanatomy
we must understand the normal structure of OCF, the understanding of extraoral radiographic projection by looking at every technical aspect
aspect
identified in the submentovertex (SMV) projection
waters projection
posteroanterior cephalometric projection
open-mouth reverse-Towne projection
lateral cephalometric projection
normal anatomy
For instance, a bilateral mandibular radiolucency may indicate
normal anatomy, such as extensive submandibular gland fossa.
Abnormal conditions are more commonly unilateral. For instance,
fibrous dysplasia commonly is unilateral.
commonly the anatomy are bilateral
definition
Radioanatomy is anatomy discipline which involves the study of anatomy through the use of radiographic films. The x-ray film represents two-dimensional image of a three-dimensional object due to the summary projection of different anatomical structures onto a planar surface.
Indirect metal restoration
Classification
noble metal
Definition
metal that are resistance to tarnish and corrosion
composition
Pd (Palladium)
Pt ( Platinum)
Rh (rhodium)
Au (Gold)
Ru (ruthenium)
Ir (Iridium)
Os (osnium)
base metals
Definition
also known as non-noble metals and it is highly active in our oral cavity.
Function
it aims to protect alloy from corrosion
Composition
Cobalt
Nickle
Copper
Chromim
Iron
Manganese
Result
Crowns
Bridges
Dental implants
inlays
onlays
veneers
Definition
A process that cannot be fabricated inside the mouth and instead must be fabricated outside of the mouth before being placed on the affected tooth. thus process use kinds of material but indirect metal restoration are classified into three type
classification based on
Gold Alloy Classification
type 2
Characteristic
77% gold
has medium strength
Functions
to make inlay and onlay with moderate stress
3/4 crowns and full crowns
type 3
characteristic
72% of gold
age harden and great stress resistance
hard
Functions
to make crowns
inlay
bridge
type 1
characteristic
contain 98-99% of gold
easily burnished
soft
functions
to make inlays
class 5 restoration
site low in stress
type 4
characteristic
69% of gold
for very high stress area
very hard
functions
Bridges
Removable Partial Denture framework
long span bridges
Alloy Classification
Based on Description
Crown and Bridges Alloys
Removable Partial Denture Alloys
Metal Ceramic Alloys
Based on High Noble
High Noble alloy
The high noble alloys must have at least 40% gold and at least 60% of noble metals. the noble metals is resistant to corrasion and tarnish
Noble Alloy
noble alloy have at least than 25% of the noble metal element and highly reactive in oral cavity
base metal alloy
noble alloy have less than 25% of the noble metal element and highly reactive in oral cavity
Dyandra Wirahana Hasan - 2106717682