compositepreparation1

1. Principles of cavity
preparation for
composite
restorations
Dr. SV.SATISH
Professor & HOD
Dept of Conservative Dentistry & Endodontics
Navodaya Dental College

2. Clinical technique of composite restoration
C.Initial clinical procedures,
D.Tooth preparation for composite
E.Restorative technique for composite
F.Repairing composite restorations
Fahad will complete C and D

3. Clinical technique
• Initial clinical procedures,
1. Local anesthesia - patient is more relaxed
- reduced salivation
2. Preparation of operating site –
• clean the operating site with slurry of pumice to
remove any debris, plaque , pellicle, and
superficial stains . Calculus removal
– Prophy pastes containing flavoring agents, or fluorides
act as contaminants and should be avoided to prevent a
possible conflict with the acid-etch technique.

4. 3.Shade selection
• Color varies with
translucency,
thickness of enamel
and dentin, age of the
patient, presence of
any external or
internal stains
• Different color zones
are present - incisal
third is lighter and
translucent than
cervical third. Middle

8. Vita Lumin:
•
• B = reddish yellow
• C = grey shades
A= reddish brown B1A1 B2 D2 A2 C1 C2 D4 A3 D3 B3 A3.5 B4 C3 A4 C4

9. 3D Master

10. 1. Determineshadeat the start of an appointment
(before the tooth is subjected to dehydration)
2. Use either natural light(not direct sunlight) or a colour
corrected artificial light source.
3. Drape the patient with a neutral colored cover if
clothing is bright
4. Assess value by squinting. The reduced amount of light
entering the eye allows the retinal rods to better
distinguish degrees of lightness and darkness. (Vita
Lumin shade tabs set in order of value )
5. Make rapid comparisons with shade tabs (no more than
5 seconds each viewing) Make the selection
rapidly to avoid eye fatigue

11. • If more time (more
than 30) required
then look at
complimentary colors
(blue/violet) this
revitalizes and
resensititze the
color receptors in
the eye

12. 6. Choose the dominant hue and chroma within the value
range chosen. The canines - useful guide to assessing
hue.
7. Compare selected tabs under different conditions eg
wet vs dry, different lip positions, artificial and natural
light from different angles.
8. Look carefully for colour characterisation such as
stained imbrication lines, white spots, neck
colouration, incisal edge translucency

13. Automated Shade
Selection

14. B.Tooth preparation for composite
4.Cavity preparation

15. Tooth preparation
principles and criteria
External Outline form
• Extent is determined by size, shape, and location of
defect .
• should include all Caries, any fault, defective, old friable
tooth structure.
• Removal of discolored tooth structure as required for
esthetics.
• Create prepared enamel margin of 90° or greater by
giving bevel wherever required.
• Create 90° cavosurface on root surfaces
• Pulpally, no uniform depth is needed
• Depth should be sufficient to identify and remove caries
or existing restoration.

16. RETENTION
4. Micromechanical retention by etching of enamel and
dentin.
5. Mechanical undercuts when margins terminate in
cementum.

17. Advantages of beveling.
3. Increase in surface area because stronger
enamel to resin bond
5. Ends of enamel rods are etched.
7. Esthetic blending due to cavosurface bevel.

19. Cavity designs for composite cavity
preparation
• Conventional
• Beveled conventional
• Modified
• Box shape
• Facial/lingual slot

20. CONVENTIONAL
similar to that of cavity preparation for amalgam
restoration.
A uniform depth of the cavity with 90° cavosurface
margin is required
INDICATIONS
6. Moderate to large class I and class II restorations
7. Preparation is located on root surfaces.
8. Old amalgam restoration being replaced

21. BEVELED CONVENTIONAL
2. Similar to conventional cavity design
3. Have some beveled enamel margins.
INDICATIONS
6. Composite is used to replace existing restoration.
(class III, IV, V)
8. Restore large area
Rarely used for posterior composite restorations

23. Combined design

24. MODIFIED
2. No specified wall configuration.
3. No Specified pulpal or axial depth.
4. All parameters determined by extent of caries.
5. Conserve tooth and obtain retention (MICRO
MECHANICAL).
6. Scooped out appearance
INDICATIONS
• small, cavitated, carious lesion surrounded by
enamel
• correcting enamel defects.

26. BOX ONLY
• When only Proximal
surface is faulty and
no lesion on occlusal
surface

27. FACIAL OR LINGUAL SLOT
2. Lesion is proximal but access is possible through
facial or lingual surface
3. Cavosurface is 90 or greater.
4. Direct access for removal of caries.

33. 5. Isolation of operating site
- Rubber dam
- cotton rolls
- retraction cord
6 . Pulp protection
- Calcium hydroxide, GIC , RMGI
- ZnOE is contraindicated

34. 7. Matrix placement
• Two types of matrices are available
- Polyester matrix
- metal matrix
• Various matrix retainer which can be used
are
- Tofflemire retainer
- Compound supported metal matrix
- Sectional matrix system- palodent contact

37. • Polyester matrix
- used especially CLASS III, CLASSIV ,CLASS V
cavities
Advantage - they allow the light to pass
Disadvantage - they are not rigid and get deform during
placement of rigid material and contact cannot be
properly restored
• Metal matrix
- Ultrathin metal matrices 001- .002 inch are used
- Band should be precontoured outside the mouth