Composite

COMPOSITE RESIN RESTORATION

2. CONTENTS
Introduction
History
Definition
Indications
Contraindications
Advantages
Disadvantages
Classification
Composition
Types of composites
Recent advances
• Mode of supply
• Curing and curing lamps
• Properties
• Clinical techniques
• Finishing and polishing
• Repair of composites
• Tunnel restorations
• Sandwich technique
• Conclusion
• References

3. INTRODUCTION
Composite resins are a class of mature and well
established restorative materials that have their
own indication in anterior and posterior teeth.
Dental composites have continued to evolve with
the development of smaller particle sizes, better
bonding systems, curing refinements and sealing
systems. Although composites are now well
accepted in general practice, the complex steps
involved have hindered their full success.

4. HISTORICAL DEVELOPMENT
During the first half of the 20th century, silicates
were the only tooth coloured esthetic material
available for cavity restoration.
Acrylic resins similar to those used for custom
impression trays and dentures replaced silicates
during the late 1940s and the early 1950s because of
their tooth like appearance , insolubility in oral fluids,
ease of manipulation and low cost.

5.  In 1956, Dr. R.L. Bowen developed a polymer based on
dimethacrylate chemistry.
This polymer was generally known as Bis-GMA or
Bowen resin, was made up from the combination of
bisphenol – A and glycidyl methacrylate.

6. 1956 - Bowen Resin
1960 - Traditional or
Macrofilled composites
1970 - Mircofilled and Light
initiated composites
1980 - Posterior composites
1990 - Hybrid, Flowable,
Packable, Compomers
2000 - Nanofilled composites

7. DEFINITION
SKINNER’S
A highly cross linked polymeric material reinforced by a
dispersion of amorphous silica, glass, crystalline or organic
resin filler particles and/or short fibers bonded to the matrix
by a coupling agent.
DCNA
A 3 dimensional combination of at least two chemically
different materials with a distinct interface separating the
components.

8. STURDEVANT
In materials and science word composite refers to
a solid formed from two or more distinct phases
that have been combined to produce properties
superior to or intermediate to those of individual
constituents.

9. INDICATIONS
Class I, II, III, IV, V, VI
core buildups
Sealants and preventive resin
restorations
Esthetic enhancement
procedures
Cements
Veneering metal
crowns/bridges
Temporary restorations
Periodontal splinting
Non carious lesions
Enamel hypoplasia
Composite inlays
Repair of old composite
restoration
Patients allergic to metals

10. CONTRAINDICATIONS
Isolation
Occlusion
Subgingival area/root surface
Poor oral hygiene
High caries index
Habits (bruxism)
Operator abilities

11. ADVANTAGESEsthetics
Conservation
Less complex
Used almost universally
Strengthening
Bonded to tooth
structure
Repairable
No corrosion
No health hazard
Cheaper then porcelain

12. DISADVANTAGES
Polymerization shrinkage
Technique sensitive
Higher coeff. Of thermal expansion
Difficult, time consuming
Increased occlusal wear
Low modulus of elasticity
Lack of anticariogenic property
Staining
Costly

13. CLASSIFICATION
SKINNER’S (10
th
ed)
Traditional composites (Macrofilled) 8-12mm
Small particle filled composite – 1-5mm
Microfilled composite – 0.04 – 0.4 mm
Hybrid composite – 0.6 – 1 mm

14. •ANUSAVICE (-11
th
ed)

15. STURDEVANT
Classification of composites based on the filler particle
size
Megafill- in this one or two large glass inserts 0.5 to 2 mm
in size are placed into composites at points of occlusal
contact.
Macrofill- particle size range between 10 to 100 µm in
diameter
Midifill - particle size range between 1 to 10 µm in
diameter, also called traditional or conventional
composites.
Minifill - particle size range between 0.1 to 1 µm in
diameter
Microfill - particle size range between 0.01 to 0.1 µm
Nanofill - particle size range between 0.005 to 0.01 µm

16. As per filler size

18. According to CRAIG:
TYPE I:
Class 1 – Macrosized particles – 8-25µ
Class 2 – Mini size particles – 1-8µ
Class 3 – Micro size particles – 0.04-0.2µ
Class 4 – Blend of macro and micro – 0.04-10µ
TYPE II
Class 1: Macrosized 10-20µm (organic particles
in unreinforced resin matrix).
Class 2: Macrosize unreinforced particles 10-
20µ (organic in reinforced resin matrix 0.04-
0.2µ organic).

23. MODE OF PRESENTATION

24. METHODS OF
POLYMERIZATION

25. COMPOSITION

27. Resin matrix

28. Inorganic Fillers

29. FILLER SHAPES
Large spherical
particles
Large irregularly
shaped particles
Blends

30. Filler particles are most commonly produced by
grinding or milling quartz or glasses to produce
particles ranging in size from 0.1-100um.
Submicron silica particles of colloidal size
(0.04um),referred to as microfillers, are obtained
by a pyrolytic or precipitation process.In these
processes a silicon compound is burned in an O2
and H2 atmosphere to form macromolecule
chains of SiO2.

31. Material Used:

32. Classification of fillers
i): Quartz: It is made by grinding or milling quartz, was used in
early composites.it is chemically inert.
Because of its hardness it was difficult to grind to a finer size &
was difficult to polish, causes abrasion of opposing tooth
structure.
ii) SILICA :obtained by a pyrolytic or precipitation
process.Apart from reinforcing the composite ,it also helps in
high scattering and light transmission.
Forms of silica: Forms of silica:
- Pure silica.
- Fused silica.
- colloidal silica.

33. iii) GLASSES: Aluminosilicates & Borosilicates.provides
radiopacity.
Other fillers:
Tricalcium phosphate & Zirconium
dioxide.
Recently fluoridefluoride fillers like: Yittrium trifluoride &
Yitterbium trifluoride are introduced.

- to ensure acceptable esthetics of composite translucency
of fillers should be similar to tooth structure.

34. Coupling agents
H2O

36. Activator-initiator system

37. HEAT ,LIGHT AND SOME CHEMICALS CAUSES
DECOMPOSITION OF BP RESULTING IN FREE
RADICALS THAT INITIATE POLYMERISATION .
HENCE IT IS RECOMMENDED THAT COMPOSITE
SHOULD STORED IN COOL ,DARK ,CLEAN
ENVIORNMENT .
USES-RESTORATIONS AND LARGE FOUNDATION
STRUCTURES THAT ARE NOT EASILY CURED WITH A
LIGHT SOURCE.

39. THESE COMPOUND ABSORBS
LIGHT(VISIBLE AND UV) AND
GENERATE FREE RADICALS .
FOR SYSTEM USING
ULTRAVIOLET LIGHT
INITATION BENZION ALKYL
ESTER IS USED AS
INITIATORS.
FOR SYSTEMS USING VISIBLE
LIGHT A DIAKETONE SUCH
AS CAMPHOROQUINONE
(APP.0.2%) IS USED .
CQ ABSORBS BLUE LIGHT
(400-500NM),PRODUCES AN
EXCITED STATE OF
CQ+AMINE FREE
RADICALS.

40. INHIBITORS
Butylated hydroxytoluene (BHT)-0.01%
4 –Methoxy phenol (PMP)
Extends storage life and provides sufficient working
time
 THESE COMPOUNDS ARE USED IN AMOUNTS OF
0.1 % OR LESS
OPTICAL MODIFIERS
Pigments-metal oxides
Opacifiers-titanium dioxide & aluminum oxide-0.001-
0.007%
Darker shade & opacifier-thin layers
UV light absorbers

41. TYPES OF COMPOSITES

42. TRADITIONAL COMPOSITES

44. SMALL PARTICLE COMPOSITES

46. MICROFILLED COMPOSITES

47. Prepolymerized paricles(organic fillers)+colloidal silica+monomer
microfilled composite paste

49. HYBRID COMPOSITES

51. Nanofilled Composites
These particles are extremely small (0.005- 0.01 µm)
and virtually invisible.
Their particle size is below range of wavelength of light
and thus they do not absorb or scatter visible light.
Nanofiller offers means of incorporating
radiopacifiers that do not interfere with esthetic
properties

52. THANK YOU
“The world hates change, yet it is the only thing
that has brought progress.”
-Charles Kettering

54. FLOWABLE
COMPOSITES
Created for special handling properties – Fluid
injectibility.
Introduced in 1996, the flowable composites are
characterized by the presence of filler particles that
have a particle size similar to hybrid composite but
the filler content is reduced which results in
viscosity
They were launched to improve handling
characteristics of existing composites

55. PROPERTIES
Filler size 0.6-1 µm
Filler content 30-55 wt%
Compressive strength 210-300 MPa
Elastic modulus 4-8 GPa
Flexural strength 70-120 MPa
Depth of cure 6 mm

57. PACKABLE COMPOSITES
Based on newly introduced concept called
PRIMM(Polymer rigid inorganic matrix material)
System consist of a resin and a ceramic component
Filler phase instead of being incorporated are ground
particles present as a continuous network of ceramic fibers
Fibers composed of alumina & silica which are
superficially fused to each other at specific sites to
generate a continuous network of small components

58. Silanization of the fibrous network is done by infiltration with
BiSGMA resin
Consistency of PRIMM based composite is similar to freshly
triturated mass of amalgam
PROPERTIES
Inorganic filler 65-81 wt %
Compressive strength 220-300 MPa
Flexural strength 85-100 MPa
Tensile strength 40-45 MPa
Elastic modulus 3-13 GPa
Depth of cure 6 mm

59. Antibacterial Composites
Composites that offer antibacterial properties are promising
since several studies have shown that a greater amount of
bacteria and plaque accumulate on the surface of resin
composite than on the surface of other restorative material /
enamel surface.
Imazato et al 1994 incorporated a non-releasing newly
synthesized monomer MDPB with anti-bacterial properties
into resin composites.

60. MDPB is methacryloxy decyl pyridinium bromide. It was
found to be effective against various streptococci
However, its activity against other important species in
plaque formation like Actinomyces still needs to be
investigated
Silver has also been added in composites to make it
antibacterial

61. NANOCOMPOSITES
Inorganic Phase – nanosized – 0.1 to 100 nm.
Increased overall filler level.
Are unable to scatter or absorb visible light.
Nanofillers - usually invisible and offer the
advantage of optical property improvement
-Mitra et al., 2003

62. ORMOCERS
“Organically Modified Ceramics.”
Chemically- Methacrylate Substituted Alkosilanes ie.,
Organic -Inorganic Copolymers.
Based on organically modified heteropolysiloxanes.
Filler particles are incorporated into this cross-
linked inorganic and organic network matrix.

63. PROPERTIES
Compressive strength: 410 MPa
Filler Content: 77-80%
Polymerization shrinkage: 1.97 Vol. %
Elastic modulus: 13-14 GPa
Polish ability: high gloss
Color stability: no discoloration ISO 4049

64. COMPOMERS
Polyacid modified resins:
Mc Lean & Nicholson defined it as:
“Materials that may contain either or both of the
essential components of a glass ionomer cement
but at levels insufficient to promote the acid-base
curing reaction in the dark.”
Compomer monomers contain acidic functional acidic functional
groupsgroups that can participate in an acid/base glass
ionomer reaction following polymerization of the
resin molecule

65. A resin polymerization takes place resin polymerization takes place with the compomers
after the material has set completely. The glass-glass-
ionomer reaction(acid/base) may then occurionomer reaction(acid/base) may then occur in the presence
of water. In the presence of water from the oral cavity, the
acid functional groups, which are attached to the monomer
units, and have now become part of the polymerized material
are able to react with the base (glass) to stimulate the glass
ionomer reaction. Fluoride is released Fluoride is released as a result of this
reaction.

66. Paste containing Ca, Al, F silicate glass filler in
dimethacrylate monomers with acrylic acid like
molecules.
Set by polymerization & then delayed acid/base reaction.
Good strength, biocompatible, low solubility.
Have higher wear than composite, lower F release than
conventional GIC.

67. INDICATIONS:INDICATIONS:
Sealing and filling of occlusal pits and fissures.
Restoration of deciduous teeth.
Minimal cavity preparation or tunnel preparation
As a liner - cariostatic action is required.
Core-build – up.
Repair of defective margins in restorations.
 Class V repairs.
 Erosion
 Retrograde filing materials

68. GIOMERS
Hybrid of Glass Ionomers & composites.
Advantages of both.
Resin based & Contain Pre-reacted Glass Ionomer
particles.
Flourosilicate Glass + Polyacrlylic acid & resin.
Giomers employ the use of (PRG) technology to form a
stable phase of GIC in the restoration and are also
known as PRG composites

69. Giomers are light polymerized and require bonding
system for adherence to enamel and dentin. The bonding
system currently available is known as Reactmer bond
(Shofu Inc. Kyoto, Japan).
Reactmer bond is the glass ionomer based,
tricurable, all-in-one, filled adhesive based on PRG
technology and consists of UDMA, HEMA, PRG filler,
fluoroaluminosilicate glass, acetone, water and initiator.

70. SMART COMPOSITES
Ivoclair introduced a material in 1998 named
Ariston pHC (pH control).
 Releases Fluoride & Ca Hydroxide when the
pH in restoration in the material is less than 5.5

71. Smart composites work based on the newly developed
alkaline glass filler which will reduce secondary caries
formation at the margin of a restoration by inhibiting
bacterial growth. This results in a reduced
demineralization and a buffering of the acid produced by
caries forming microorganisms

72. Composition
The paste consists of mixture of different types of
dimethacrylate (20.8 wt %),
Inorganic fillers Ba, Al and F silicate glass filler (1 μm)
Ytterbium triflouride
Silicon dioxide
Alkaline Ca silicate glass (1.6 μm) in dimethacrylate
monomers.
It is filled 80% by weight and 60% by volume.

73. CEROMERS
Ceramic Optimised Resins
Laboratory processed inlays , onlays.
Some manufacturers – with fiber reinforcement for
short span bridges
Three-dimensionally loaded fillers in a
polymer matrix of which two are fluoride
releasing

74. Material consists of a paste containing

75. Indications
Class I and II posterior restorations (stress bearing areas)
Class III and IV anterior restorations
Class V restorations cervical caries, root erosion, abfraction,
wedge-shaped defects
Inlays/onlays with extraoral post-tempering

76. INDIRECT COMPOSITES
Art glass
Bell glass HP
Clearfil CR inlay
Coltene inlay system
Cristobal
Sculpture
Targis
True vitality
Visio gem

77. MODE OF SUPPLY
For chemical cure-
syringes/tubs
For light cure-
spills/syringe/compules

78. CURING
CHEMICAL ACTIVATION
cold curing or self curing
Advantages
Even polymerization-75%
Disadvantages
Oxygen inhibition
No control over Working time

79. LIGHT
ACTIVATION
UV light
Visible light
Advantages
Easy to use, single paste
Less porosity
Less sensitive to oxygen
Command polymerization
Colour stability, colors can be
optimized
Better mech properties
Setting time –faster cure
–Disadvantages
•Increments
•Time consuming
•Poor accessibility
•Variable exposure
•Sensitive to ambient light
•Shrinkage
•Ocular damage
• Cost

80. Comparison
Chemical Light cure
Polymerization is central Peripheral
Curing is one phase Is in increments
Sets within 45 seconds Sets only after light activation
No control over working time Working time under control
Shrinkage towards centre of bulkShrinkage towards light source
Air may get incorporated Less chance of air entrapment
More wastage of material Less wastage
Not properly finished Better finish

81. DUAL CURING
2 light cure pastes-syringes/tubs
Combines chemical and light curing
Disadvantages- air inhibition,porosity
Use-cementation of bulky ceramic inlays
EXTRAORAL CURING
Use- a chemical or light cured composite used to
produce an inlay on a tooth or die

82. CURING LAMPS…
1970’s-”Nuva Light”
360-400nm
Types of devices
4 sources of light
440-490nm
CURING
SYSTEMS
UV LIGHT VISIBLE LIGHT

83. Counter top units
Gun type units-features
Types of devices…

84. Quartz-Tungsten-Halogen units
CONVENTIONAL HALOGEN
CURING LAMPS
E.g.: Optilux 500
Advantages
Less cost
Simple, well known
technology
Little/no heat

85. Disadvantages
Slow cure time
Plug into electricity
Large, cumbersome
Decreased output
Replace lamp
Halogen gas
protects filament by:
oxidation
re-deposits tungsten
to filament by:
 Halogen CycleLight guides

86. Plasma Arc units
Advantages
Curing time-3 sec
Short procedure
Disadvantages
Heat production
High cost
Large, bulky
Two tungsten electrodes
Pressurized chamber
Contains xenon gas
High-voltage spark
It ionizes xenon gas

87. Argon laser units
ADVANTAGES
Correct wavelength
Deeper & faster curing
Better mech properties
Decreased sensitivity to curing tip
distance
Less post-op sensitivity & discomfort
DISADVANTAGES
Increased shrinkage, brittleness
Marginal leakage
Heat increase on surface
Expensive
Bulky equipment

88. LED units
ADVANTAGES
Cordless,light weight
Long lasting
No heat
Moderate curing time
Quiet
DISADVANTAGES
New technology
Slower than PAC
Batteries must be recharged
Higher cost
Low intensity
Narrow emission spectrum
440-490 nm
peak at 470 nm
near absorption max activation
of camphoroquinone
efficient

89. First
generation
high cost
low
irradiance
< 300
mW/cm
2
increase
exposure
time
Second
generation
Single large
surfaced emitting
LED chips
lower cost
higher irradiance
> 600 mW/cm
2
similar to
halogen
High heat
production
Third
Generation
1 or more low-
powered chips
that emit a
second
frequency

90. Optical Safety
Do not look directly at light
Protection recommended
glasses
Shields
May impair ability
to match tooth shades

91. Degree of conversion
% of C-C double bonds that have been
converted to single bonds to form
polymeric resin
 Strength, wear resistance
Avg 50-60%, light cure-44-75%
Cross linked , pendant, free groups
Factors
Light curing: more shrinkage stress
Staining
Sensitivity
Secondary caries

92. polymerization shrinkage
Value: 1- 4% , stress: 17MPa
Prevents bonding to dentin-
strength required
Causes stress to develop
Externally: interface of restoration
& tooth
Internally: between filler and resin

93. Factors affecting stress development
Restorative technique
Modulus of resin elasticity
Polymerization rate
Cavity configuration

94. Cavity configuration [C-FACTOR]
BONDED WALLS
UNBONDED WALLS
C=
During curing, shrinkage leaves the bonded
surfaces in a state of stress, while the free surfaces
relax some of the stresses by contracting inward
toward the bulk of the material.
Use of incremental/layering technique

95. Two walled cavity Three walled cavity
C=

2 Bonded
4 Unbonded
C-FACTORC-FACTOR 0.50.5
CAVITY CLASSCAVITY CLASSIVIV
C=
3Bonded
3Unbonded
C-FACTORC-FACTOR 11
CAVITY CLASSCAVITY CLASSIIIIII

96. Four walled cavity Five walled cavityFour walled cavity Five walled cavity
C=C=
C-FACTORC-FACTOR 22
CAVITY CLASSCAVITY CLASSIIII
4Bonded4Bonded
2Unbonded2Unbonded
C=C=
C-FACTORC-FACTOR55
CAVITY CLASSCAVITY CLASS I I
5Bonded5Bonded
1Unbonded1Unbonded

97. REDUCTION OF RESIDUAL STRESS
Reduction in vol contraction by alteration of chemistry
Low shrink monomers
Clinical techniques
Curing rate control
Incremental build-up
Resin based composite systems
Dentin-enamel adhesive systems
Using material which flows
Material with low modulus of elasticity
Introduction of air bubbles

98. CHARACTERISTIC
PROPERTY
Unfilled
acrylicTraditional
Small
particle
HybridMicro filled
Size (mm) - 8-12 0.5-3 0.4-1.00.04-0.4
Inorganic filler (vol
%) 0 60-70 65-77 60-65 20-59
Inorganic filler (wt
%) 0 70-80 80-90 75-80 35-67
Compressive
strength (MPa) 70 250-300350-400300-350 250-350
Tensile strength
(MPa) 24 50-65 75-90 40-50 30 -50
Elastic modulus
(GPa) 2.4 8-15 15-20 11-15 3-6
TEC (ppm/ °C) 92.8 25-35 19-26 30-40 50-60
Water sorption
(mg/cm
2
) 1.7 0.5-0.70.5-0.60.5-0.7 1.4-1.7
Curing shrinkage
(vol%) 8-10
-
2-3 2-3 3-4
Radio
opacity(mm\Al) 0.1 2-3 2-3 2-4 0.5-2

99. OTHER PROPERTIES

103. CLINICAL TECHNIQUE…
Local anesthesia
Preparation of operating
site
Shade selection
Isolation
Rubber dam
Cotton rolls
Gingival retraction cord
Preoperative wedging
INITIAL PROCEDURES

104. Tooth preparation
CONVENTIONAL
DESIGN
Conventional Tooth Preparation
are those typical for amalgam
restoration
walls in butt joint junction (90º)
with the restorative material
Indications-
i. Preparations located on root
surfaces.
ii.Moderate to large class I
or class II restorations.

106. MODIFIED
Scooped out preparation
Modified preparations are
indicated for the initial
restoration of smaller,
cavitated, carious lesions
usually surrounded by
enamel & for correcting
enamel defects.

107. This design is indicated when
only proximal surface is
faulty with no lesion present
on the occlusal surface.
•BOX-ONLY •FACIAL/
LINGUAL SLOT
• Design for restoring
proximal lesions on
posterior teeth.

108. Shade selectionShade selection
Composite shade is selected by working with a clean,
moist tooth prior to placement of a rubber dam.
Shade selection should be
done prior to prolonged
drying of teeth because
dehydrated tooth becomes
lighter in shade as result of
decrease in translucency.

109. Samples from the shade guide should be applied parallel with
the tooth whose color is being matched, not in front of it (it
will appear lighter), and not behind it (it will appear darker)
Shade selected acc. to
manufactures shade guide or
VITA shade guide.
Natural light is preferable.

Shade tab is holded near the
teeth to be restored & is partially
covered with lip or operator thumb.

110. To choose accurate color - small amt. of selected
color shade material is placed on the tooth, in close
proximity to the area to be restored & cured.
Isolation of operating field
a) Rubber dam
b) Cotton rolls with or without retraction cord

111. RESTORATIVE TECHNIQUERESTORATIVE TECHNIQUE
1. 1. Preliminary steps for enamel & dentin bonding:Preliminary steps for enamel & dentin bonding:
 Both liquid & gels etchants are available(32 to 37%).

Acid etching is done for 15-30secs.

Following this it has to be thoroughly
rinsed with a water spray for 5-15secs.

Later the surface should be dried with
air or cotton pellets. The etched enamel
appears frosty white.

115. Bonding
Use low viscosity resin which will flow into etched
enamel pores & dentinal tubules to form resin tags.
Act as intermediary between tooth and composite.

The bonding agent is applied using a microbrush.

The manufacturer's instructions are followed regarding the no.of coats to be applied and the curing time.(usually 20secs
labially and lingually each)
20 - 30
sec.
Apply ample Apply ample
amounts, amounts,
leave leave
undisturbedundisturbed
Remove Remove
solvent with solvent with
air-syringeair-syringe

116. 
It penetrates the irregularities on enamel and bonds
micromechanically by formation of resin tags.

On dentin, it penetrates the collagen network and the dentinal tubules.
CURING:
Two categories of technique are commonly used in
curing polymers:
continuous and discontinuous.

117. The continuous cure refers to a light-cure sequence
in which the light is on continuously.
 There are four types of continuous curing:
uniform continuous cure, step cure, ramp cure, and
high-energy pulse . Continuous curing is conducted
with halogen, arc, and laser lamps.
 The discontinuous cure is also called soft cure,
which commonly uses a pulse delay.
Distance from a tooth to initiate a cure, and then
moving it close to the restoration for the duration of
appropriate exposure.

118. In uniform continuous curing intensity is kept
uniform over the time

119. In step curing intensity is increased in sudden step over
the time.

120. Ramp curing is where the intensity continuously
increases over the time

121. In high energy pulse the high intensity is
kept for shorter exposure time.

123. 3. Insertion of composite3. Insertion of composite
Can be inserted with the help of hand instruments or syringe
or guns.
Material is inserted in increments in thickness of 1-2mm

124. Different designs of increment placementDifferent designs of increment placement
1.Three increment design
one flat increment at gingival &
occlusal wall & two oblique
increments both at proximal
box occlusal box.
1
st
increment thinner than 1.00mm.
2. Horizontal layering design
small increments placed
horizontally one above the
other, starting from gingival wall
to occlusal wall.

125. 3. Oblique layering design
Each increment is placed obliquely
starting from any sides & curing
is done from all three sides.
4. U-shaped layering design
At base, both gingival & occlusal
gingival, U-shaped increment is given

126. 5. Vertical layering techq.
Increments are placed in vertical
fashion starting from one wall
& carried on to another wall & curing
is done from behind the wall.
6. Layering techq. in the proximal box
& curing each increment by inserting
the fiber-optic microtip into composite.

127. FINISHING &
POLISHING OF COMPOSITES

128. REPAIR OF COMPOSITES
OLDER
RESTORATION
Etch, primer,
adhesive, composite
Bond strength- 50%
FRESHLY
POLYMERIZED
If not yet contoured
Directly place
composite
If contoured and
polished
Re-etch, adhesive,
composite

129. TUNNEL RESTORATIONS
Jinks in 1963 introduced this as a conservative
approach for CLASS II.
Hunt & Knight modified the technique
INDICATIONS
Pt. with high esthetic demand, low caries rate with
small proximal caries without involvement of the
marginal ridge.

130. CONTRAINDICATIONS
Large proximal caries involving marginal ridges.
Marginal Ridges under excess occlusal loads.
Difficulty in access
Proximal
Caries
Tunnel Tunnel
Prep. Prep.
Round burRound bur
GIC GIC
placedplaced ComposiComposi
te over te over
GICGIC

131. ADVANTAGES
Marginal ridge is preserved
Reduced microleakage
Adjucent tooth preserved
DISADVANTAGES
Poor visibility & lack of caries removal
Marginal ridge may be undermined
Prep. may extend closer to pulp than desired

132. SANDWICH TECHNIQUE
Developed by McLean.
Laminate or Bilayed technique.
Large Class III, IV, V & Class I, II.
COMPOSITECOMPOSITE
GICGIC
GIC
COMPOSITECOMPOSITE

133. In close sandwich the GIC is placed over pulpal floor and
axial wall then composite is placed and cured on the GIC
In open sandwich the GIC is placed on the gingival seat
and on that
composite is cured till
the occlusal level

134. ADVANTAGES
Favourable pulpal response due to biocompatibility of
GIC.
Fluoride release minimizes recurrent caries.
 Less composite, less polymerisation shrinkage.
DISADVANTAGES
Time consuming.
Technique sensitive.
Adhesion of composite with GIC is a worry.

135. CONCLUSION
Composites have acquired a prominent place among the
filling materials employed in direct techniques. Their
considerable aesthetic possibilities give rise to a variety of
therapeutic indications, which continue to grow as a result
of the great versatility of the presentations offered.
Nonetheless, it should not be forgotten that they are
highly technique-sensitive, hence the need to control
certain aspects: correct indication, good isolation, choice
of the right composite for each situation, use of a good
procedure for bonding to the dental tissues and proper
curing are essential if satisfactory clinical results are to be
achieved.

136. REFERENCES…
Phillips’: Science of dental materials
Sturdevant : Art and science of operative dentistry
Vimal Sikri : Textbook of operative dentistry
Marzouk : Operative dentistry - modern theory and practice
Craig: Dental marterials
Charbeneau : Principles & practice of operative dentistry
Goldstein : Esthetics in dentistry