non colored filling material
DESCRIPTION
Non colored filling material - Dental MATERIALTRANSCRIPT
University of Mosul - College of dentistry
Non colored filling material
Rami Bassam
2nd Stage Mosul University Dentistry College
e
Done By
University of Mosul - College of dentistry
Dental Filling A dental restoration or dental filling is a dental restorative material used to restore the function, integrity and morphology of missing tooth structure.The structural loss typically results from caries. filling materials : * they are classified into direct and indirect
University of Mosul - College of dentistry
NONCOLORED FILLING MATERIALS
Non colored (tooth colored) restoration material have been used to replace missing tooth structure and to modify tooth of decayed of previously filled tooth color and thus enhancing tooth facial esthetic
Patients use white fillings because they want their teeth to look natural when they laugh, talk and smile.
University of Mosul - College of dentistry
Non colored filling materials
Resin based filling material
2. Composite materials
1.Acrylic resin
Silicate based filling material
University of Mosul - College of dentistry
Silicate Based Filling Material
Silicates were the earliest of the direct tooth colored filling materials. It was used extensively to replace carious teeth for the anterior
region It has a good appearance ,and available in a variety of tooth-like
shade that help in close matching with surrounding tooth substance
Composition
It was supplied as powder and liquid system
Powder: Sodium alumino - silicate glass with 20% calcium fluoride.Liquid: 50% phosphoric acid, H20, Buffering agent
University of Mosul - College of dentistry
Properties 1-The setting reaction is rather slow and protracted
2-During the early stages of setting the material is very sensitive to moisture
3-Silicates are good thermal insulators and expand and contract at about the same rate as tooth substance
4-Silicates are very brittle materials
5-The silicates show no adhesion to tooth substance
University of Mosul - College of dentistry
Advantage1-Anticariogenic: fluoride release lead to less chance for
caries development
2-Good thermal insulator
3-Coefficient of thermal expansion near to that of tooth structure
4 -Easily manipulated
University of Mosul - College of dentistry
Disadvantages1 -Pulpal irritation due to low pH (5-3.5).
2 -Brittle and has weak mechanical properties.3 -Shrinkage on setting.
4 -Discoloration.5 -High solubility and disintegration.
University of Mosul - College of dentistry
Acrylic Resin The self cure acrylic resin for anterior restoration was developed to over come the problems associated with silicate cement
Composition : 1 -Powder: polymer ( poly methylmethacrylate beads )
2 -liquid :Monomer (methyl methacrylate)
University of Mosul - College of dentistry
Advantage1 -Less soluble than silicate over a wide range of pH.
2 -Less irritant to the dental pulp than silicate but it has residual methyl methacrylate which is irritant to the pulp.
3 -Less brittle than silicate.4 -Has the ability to match the color of the tooth.
5 -Some products which contain fluoride (anticariogenic)
University of Mosul - College of dentistry
Disadvantages
1-Temperature rise during setting caused by highly exothermic
polymerization reaction necessitate the use of protective cavity base material
which is calcium hydroxide.Products containing Eugenol should be avoided.
2 -Undergo a considerable setting contraction which the fluids can penetrate
University of Mosul - College of dentistry
Composite Fillings Composte filling (white filling) are the most common type of
fillings and very popular because of tooth colored appearance that can be matched to the shade of existing teeth
They are esthetically add superior to amalgam filling
University of Mosul - College of dentistry
Composition A composite filling is made of dimethacrylates
and assorted filler-particles such as fine-grained
glass, ceramic, quartz powder and silicate.
University of Mosul - College of dentistry
University of Mosul - College of dentistry
Advantage 1 – good esthetics
2 – insultive . Low thermal conductivity 3 -conservation tooth structure removal
4 - reparable
University of Mosul - College of dentistry
Disadvantages1 -More difficult , time consuming and costly
2 -Technique sensitive
3-High coefficient of thermal expansion
4 -Discoloration
5 -Have no good bonding with tooth substance (chemical and mechanical means of retention)
6. -Composite fillings carry a risk of causing pain and/or heat sensitivity after fitting. These
are common problems which usually subside with time, and can only be avoided by
having a cavity liner put in place before the composite filling is inserted
University of Mosul - College of dentistry
The physical properties is Composite filling materials enhanced by the addition of the filler which
Advantages of adding fillers
1 -Polymerization shrinkage is reduced, as compared with unfilled due to less
resin is present in a composite. Although shrinkage is varies from one product
to another.2 -Water sorption and CTE are significantly reduced.
3 -Mechanical properties such as compressive strength, tensile strength,abrasive resistance and modulus of elasticity are improved.
4 -Optical properties (color match ) are improved
University of Mosul - College of dentistry
Classification of composite filling materials
Classification according to the method of activation
Chemical cured
Light cured
Ultra violet
Visible light cure
High intensity light cure
Light emitting diodes
Dual cured
University of Mosul - College of dentistry
Chemical cured:
also called self cured or two component system .
These resins are supplied as two pastes system with one paste containing tertiary amines as activator and other containing benzyl peroxidase as initiator .
When the two systems are mixed together the polymerization is initiated .
University of Mosul - College of dentistry
University of Mosul - College of dentistry
A-ultra violet light cure :
An alternative way to chemical cured was introduced that use the ultraviolet light to initiate
polymerization .
University of Mosul - College of dentistry
:Disadvantage 1-posibility of retina and soft tissue damage
2-it requires 60 sec. to cure depth of 1.5 mm
3-desity of light source reduced with the time
University of Mosul - College of dentistry
B-visible light cure : which is most popular method for curing
system used now days . they are integral part of modern adhesive
dentistry as they are used to cure resin based composite restorative
University of Mosul - College of dentistry
University of Mosul - College of dentistry
Advantages: 1-longer working time
2-reduced porosity
3-take 20-40 sec.to cure in depth of 1.5 mm
4-reduced waste of material
5- better resistance to wear and abrasion
University of Mosul - College of dentistry
C-high intensity light cure they recently been marked that are capable of curing resin composite more quickly than visible light . They increase the polymerization rate ,very short exposure time and ensure deep curing
University of Mosul - College of dentistry
D-light emitting diodes
advantages : 1- it can run or rechargeable battery power 2-bulb life of the light is at least 10 times longer
than that of visible light 3-produce less heat as compared to that of visible
light
University of Mosul - College of dentistry
Dual cured system
It combines self curing and light curing system
University of Mosul - College of dentistry
Composite classification according to mean particle size of major filler
Hybrid composite
Conventional composite
Microfill composite
University of Mosul - College of dentistry
Type I: Macro filled composite resin
This type is also known as conventional or traditional. Because of the relatively large particle size
this group exhibits a pattern of unacceptable wear both of itself and of the opposing tooth
University of Mosul - College of dentistry
Type II: Micro filled composite resin:
The fillers in this material are amorphous silica particles of 0.04mm average diameter. With such small filler particles
they are translucent and highly aesthetic but high filler loading is difficult to achieve.
The wear resistance is low and they cannot sustain a high filler loading.
University of Mosul - College of dentistry
Type III: Hybrid composite resin:
These are also known as small particle composites. They contain a combination of macrofiller paricles with a proportion of microfiller particles
are probably the most common used composite resins. The main variation is in the proportion and distribution of the various particle sizes because this will control the ability to fill the resin and increase the percentage loading.
•
University of Mosul - College of dentistry
Comparison between Amalgam and Composite Amalgam
1.Expand with age
2.possibly cracking the tooth and requiring repair and filling replacement .
3.chance of leakage of filling is less.
4.Life span average 12 years
Composite
1.can be made of color matching the tooth
2.the surface can be polished after the filling procedure has been completed.
3.shrink with age 4. Life span average 7
years