1. Keren Shay & Miki Babich
Group:14

2. Back round about composite
Dental composite resins are types of synthetic 
resins which are used in dentistry as restorative
material or
adhesives.
The term composite refers to a 3D structure of at least
2 chemically different materials
The binding resin and the filling material are called
phases
Composite resins are most commonly 
composite cavity restorations when used with dentin 
and enamel bonding techniques restore the tooth
back to near its original physical integrity

3. Steps in Composite restoration
1.local anasthesia 
2.Preparation of operating site
3.Shade selection
4.Isolation of operationg site
5.Tooth preparation
6.Preliminary steps of enamel & dentin bonding
7.Matrix placement
8.Insertind the composite
9.Contouring the composite
10.Polishing the composite

4. Tooth preporation
Tooth preparation often defines restoration 
strength.
Small tooth defects which receive minimal 
force require minimal tooth preparation
because only bond streng this required to
provide retention and resistance.
In larger tooth defects where maximum forces 
are applied, mechanical retention and
resistance with increased bond area can be
required to provide adequate strength.

5. Tooth preparation ,by instrument high speed, 
requires adequate access to remove caries,
removal of caries by low-speed, elimination of
weak tooth structure that could fracture, beveling
of enamel to maximize enamel bond strength,
and extension into defective areas such as
stained grooves and decalcified area,
which provides retention for the restoration. 

6. Acid burning method & bonding: 
After cavity preparation and cleaning ion the enamel 
margins of the cavity the doctor put acid (phosphoric acid
50%). After burning doctor washes and dries the surface.
The enamel should
look like chuck.
The main advantage of using composite resin materials is
that a complete seal can be achieved if acid etching of
the enamel cavity wall is performed prior to insertion of
the materials. Acid etching results in a ragged, porous
cavity wall and enamel surface which provides retention
for the restoration.
The composite itself can't enter the small hollows in 
the enamel, to solve this doctor uses bonding agent.
Bonding agent attaches to enamel mechanically,

7. The preparation should be as narrow as technically
possible without
any bevel in the occlusal fissure area and straighted 
walls
Matrix systems are placed to contain materials within 
the tooth and form proper interproximal contours and
contacts
Enamel and dentin bonding is completed 
Composite shrinks when cured so large areas must be 
layered to minimize negative forces
Generally any area thicker than 2 mm requires layering 
Composite curing when touching multiple walls creates 
dramatic stress and should be avoided.
Composite built in layers replicate tooth structure by 
placing dentin layers first and then enamel layers
Final contouring with hand instruments is ideal to 
minimize the trauma of shaping with burs

8. when working with UV light or visible light there is no
limit on time.
In chemical activation the working time is 60-90sec.
Hardening time – in most composite 3 min in this 
time the composite must remain untouched, after
this time the doctor can polish the composite
Matrix systems are removed and refined shaping 
and occlusal adjustment done with a 245 bur and a
flame shaped finishing bur.
Interproximal buccal and lingual areas are trimmed 
of excess with a flame shaped finishing bur.
Final polish is achieved with polishing cups, 
points,sandpaper disks and polishing paste.

10. refrences
http://www.docstoc.com/docs/60040658/DENT 
AL-COMPOSITEppt---DENTAL-
COMPOSITES
http://en.wikipedia.org/wiki/Dental_composite 
http://www.aboutcosmeticdentistry.com/proced 
ures/dental_fillings/index.html
http://www.slideshare.net/bijousolo/dental- 
materials-presentation