Make use of my presentation with a twist. Learn how this presentation works. It has a game in it. Enjoy and make your students learn on different types of saw :)
Different types of materials ranging from high carbon steel to ceramics and diamonds are used as cutting tools in the metalworking industry.Visit www.littlehamptoncuttingtools.com
Make use of my presentation with a twist. Learn how this presentation works. It has a game in it. Enjoy and make your students learn on different types of saw :)
Different types of materials ranging from high carbon steel to ceramics and diamonds are used as cutting tools in the metalworking industry.Visit www.littlehamptoncuttingtools.com
WOOD - As a Material
types - hard wood, soft wood, description, manufactured boards, joining methods, adhesives used, types of adhesives, types of hardware, screws used, types of nails, joints, all the joinery sketches, knock down fittings and everything about wood.
Making Sense of Tactile Indicators: A User-Friendly GuideEminent Tactiles
We offer various products including, Accessibility products, Architectural products, Street furniture and Engineering components. Even though our prime focus is on tactile indicators for
accessibility, Cement paver blocks, wheel stops, and handrails are familiar architectural products that we design with utmost care.
Industrial Arts: Enhancing and Decorating Finished ProductsJackie Vacalares
This MELC-Based lesson for EPP/TLE 6 is under the component Industrial Arts. In this lesson, I show the importance and different ways of enhancing and decorating bamboo, wood, and metal products.
The structure and composition of teeth is perfectly adapted to the functional demands of the mouth and are superior in comparison to any artificial material… So first of all, DO NO HARM.
POST AND CORE RESTORATIONS
CONTENTS
History
Alterations in endodontically treated teeth
Pre Treatment assessment
Definitions and Classifications
Materials Aspects
Biomechanical principles
Historical Update
20th century: the modern face
1960:Core concept
1961: Ferrule concept
1967: Peter Kurer:Kurer post
1970: Baraban: Parapost
1980: Aesthetic Posts
1990: Duret: Composipost
1994: Sandhaus Pasche: zirconia post
2000 : All Ceramic posts
How are endodontically treated teeth different?
Loss of tooth structure results in loss of stiffness
5% in ideal access cavity
40%- for class II
60%- for MOD
Coronal dentin
Stress bearing areas
Radicular dentin removed
Caries, destruction
How are endodontically treated teeth different?
Altered physical characteristics:
Moisture : 9% less (Helfer et al)
Collagen: Decreased (Rivera et al)
14% reduction in strength
Altered esthetic characteristics
Altered light refraction
Degradation of pulp tissue
Medicaments, fillings
Loss of proprioception
Indications: why do we need posts?
Resistance
Retention
PRE TREATMENT ASSESSMENT
Endodontic evaluation
Periodontal evaluation
Restorative evaluation
Esthetic evaluation
Prosthetic evaluation
Endodontic evaluation
Dense uniform three dimensional obturation of the root canal system.
Fluid impervious apical seal.
Periodontal evaluation
Periodontal disease should be treated prior to placement of definitive restorations.
If there is substantial loss of tooth structure, crown lengthening procedures should be considered to maintain the BIOLOGIC WIDTH.
Any destruction in this width leads to resorption of the alveolar crest, which is not desirable.
Biologic width relates to the amount of tooth structure coronal to the osseous crest upto the gingival attachment apparatus. It is about 2.04mm.
Restorative evaluation
Amount of remaining tooth structure
Anatomical position of the tooth
Functional load on tooth
Esthetic evaluation
Must be done before initiation of post endodontic therapy.
Discoloration from gutta percha can be visible in the coronal aspects of root filled teeth.
Tooth coloured posts should be used in anterior regions.
Prosthetic Evaluation
Extent of tooth destruction.
Method and material used in core build up.
Anterior teeth
Minimal damage: no complete coverage
Composite resin, GIC
Moderate to severe damage:
Post n core, full coverage crown
(Smith and Schuman)
Esthetic considerations
Type of canal
Posterior teeth
Require occlusal coverage
Minimal damage
Moderate damage:
Cuspal coverage
Full coverage
Pin retained amalgam
Severe damage
BASIC COMPONENTS OF A POST AND CORE SYSTEM
DEFINITIONS (GPT)
POST/ DOWEL is a relatively rigid, restorative material placed in the root of the non vital teeth. The foremost purpose
At Venus Enterprise, we are one of the leading brass fittings manufacturers in India engaged in manufacturing and exports of high quality brass components.
1. Materials & Processes
Design & Technology @ ISP
Plywood
Thin veneers (layers) of
wood are stuck together
with the grain in the
opposite direction to the
ones next to it. Plywood is
used to make drawer
bottoms, toys and interior
doors.
2. Resistant Materials
Design & Technology @ ISP
Chipboard
Chipboard is made by gluing
and compressing together
thousands of tiny particles
of wood. Chipboard is used
for kitchen cupboards and
furniture. It is not very
strong.
3. Resistant Materials
Design & Technology @ ISP
Blockboard
Blocks/strips of wood are
glued side by side. A thin
veneer (layer) is then stuck
on to both sides. Blockboard
is often used to make
modern furniture. It is not
as strong as plywood.
4. Resistant Materials
Design & Technology @ ISP
MDF
Tiny particles of wood are
glued together under high
pressure to form a dense,
solid board. Kitchen units
and decorative mouldings
are made from MDF. MDF
has a very smooth finish.
5. Resistant Materials
Design & Technology @ ISP
Hardboard
Hardboard is made by
gluing and compressing
pulped wood. It is used to
cover the backs of
cupboards. One side is
smooth and the other side
is rough. This is a thin
manufactured board.
6. Resistant Materials
Design & Technology @ ISP
Mahogany
Mahogany is a hardwood
which is reddish brown in
colour. Its is used to make
staircases and high quality
furniture.
7. Resistant Materials
Design & Technology @ ISP
Beech
Beech is pinkish brown in
colour with small gold
flecks. It is a close-grained
hardwood which is used to
make workbenches and
wooden mallets.
8. Resistant Materials
Design & Technology @ ISP
Parana Pine
Parana pine is a pale yellow
colour with attractive
reddish brown streaks. It is a
strong, smooth, straight-
grained softwood used for
best quality interior joinery,
i.e. staircases and built-in
furniture.
9. Resistant Materials
Design & Technology @ ISP
Aluminium
A soft, lightweight, rust-free
metal that is easy to bend
and shape. It is used to
make a variety of products,
including aircraft parts and
drinks cans.
10. Resistant Materials
Design & Technology @ ISP
Mild Steel
A dull grey metal that is
used to make products such
as nuts and bolts, stools and
car bodies. It is one of the
softest and cheapest steels.
11. Resistant Materials
Design & Technology @ ISP
Stainless Steel
A shiny, rustproof and stain
proof metal that is used to
make cutlery and good
quality saucepans. This is a
hard metal that does not
blunt easily.
12. Resistant Materials
Design & Technology @ ISP
Brass
Brass is an alloy of copper
and Zinc. It is a heavy and
fairly hard metal that is used
to make nameplates and
musical instruments.
13. Resistant Materials
Design & Technology @ ISP
Copper
Quite a tough, but easily
shaped metal that does not
rust. It is used to make
copper pipes and electrical
wires. Its is often used in
the form of sheets and
tubes.
14. Resistant Materials
Design & Technology @ ISP
Cast Iron
A heavy, hard and brittle
metal that can be melted
and poured into intricate
moulds to make vices and
anvils.
15. Resistant Materials
Design & Technology @ ISP
Tool Steel
A hard, strong metal that
resists bending and twisting.
It is used to make quality
tools such as screwdrivers
and hammer heads.
16. Resistant Materials
Design & Technology @ ISP
Acrylic
Acrylic can be easily bent
into simple forms. It is
available in transparent,
opaque and translucent
sheets, blocks, rods and
tubes.
17. Resistant Materials
Design & Technology @ ISP
Expanded Polystyrene
This is used as white
granular packaging to
prevent damage to fragile
goods. It is lightweight and
easily cut and shaped.
18. Resistant Materials
Design & Technology @ ISP
Rigid PVC
A strong, stiff and rigid
plastic that is used for
drainpipes.
19. Resistant Materials
Design & Technology @ ISP
Flexible PVC
Flexible PVC is used for
inflatable dinghies, hose
pipes, shoes and upholstery
material.
20. Resistant Materials
Design & Technology @ ISP
Reforming Process
This involves changing the
material by melting or
chemical mixing. Injection
moulding plastics and
casting metals are good
examples of this process.
21. Resistant Materials
Design & Technology @ ISP
Wasting Process
This is the process of
removing material.
Examples include sawing,
filing, drilling etc.
22. Resistant Materials
Design & Technology @ ISP
Fabrication Process
This is the process of joining
materials together.
Fabrication uses fastening
methods to hold products
together i.e. rivets, nuts and
bolts, screws etc.
23. Resistant Materials
Design & Technology @ ISP
Deforming Process
Deforming changes the
shape of the material
without wasting. For
example, when forging
metal, bending wood or
vacuum forming plastics.
24. Resistant Materials
Design & Technology @ ISP
Dovetail Nailing
By hammering nails in at
angles, we can make them
harder to pull out. This
increases the strength of
the joint.
25. Resistant Materials
Design & Technology @ ISP
Butt Joint
Butt joints are held together
using glue and nails. This is
the simplest joint to make.
26. Resistant Materials
Design & Technology @ ISP
Lap Joint
This is one of the simplest
joints that relies mostly on
glue to hold it together.
27. Resistant Materials
Design & Technology @ ISP
Dowel Joint
This joint uses wooden pins,
called dowels, to increase
mechanical strength. The
pins push into the holes and
are held in place using PVA
glue.
28. Resistant Materials
Design & Technology @ ISP
Comb Joint
Comb joints mesh together
like the fingers on your
hands. It is a strong wood
joint due to the large gluing
surface area.
29. Resistant Materials
Design & Technology @ ISP
Dovetail Joint
A dovetail joint is one of the
strongest wood joints. It
cannot be pulled apart
easily as the dovetails
interlock to add mechanical
strength.
30. Resistant Materials
Design & Technology @ ISP
Seasoning Wood
Seasoning means reducing
the moisture content of
timber to around 10%. The
wood is left in the open air
or put into large ovens
(kilns).
