cavity preparation of primary teeth

1. Topic – Classification Of Cavity Cutting
Submitted by-
Sanjita Sharma
Roll No. 61 (Batch- G)
BDS – 3rd (2017-18)
Guided by-
Dr. Binti Rani Chand

3. Definition
 Cavity Preparation is designed to
remove carious enamel and/or dentin
and restore the anatomic form of the
tooth with a durable and biocompatible
material.

4. G.V. Black’s Classification Of
Cavity Preparation

5. Class I Cavity
For caries involving pits, fissures
and defective grooves.
Locations:
 Occlusal Surface of Molars
and Premolars
 Occlusal 2/3rd of buccal and
lingual surfaces of molars
 Lingual surfaces of anterior
teeth.

6. Class II Cavity
 For caries lesions formed on the
proximal surfaces of the bicuspids and
molars.

7. Class III Cavity
 Carious lesions found on the proximal
surface of anterior teeth that do not
involve necessitate the removal of the
incisal angle.

8. Class IV Cavity
 Carious lesions found on the proximal
surfaces of anterior teeth that involves
the incisal angle.

9. Class V Cavity
 Carious lesions found at the gingival 3rd
of the facial and lingual surfaces of the
anterior and posterior teeth.

10. Class VI Cavity (Simon’s
Modification)
 Carious lesions involving cuspal tips and
incisal edges of teeth.

11. Other Modifications
I. Charbeneu’s Modification :
 Class II: Cavities on single proximal
surfaces of bicuspids and molars.
 Class VI: Cavities both mesial and distal
proximal surfaces of posterior teeth that
will share a common occlusal isthmus.
 Lingual surfaces of upper anterior teeth.
 Any other unusually located pit or fissure
involved with decay.

12. II. Sturdevant’s Classification
 Simple Cavity: Cavity involving only one
tooth surface.
 Compound Cavity: Cavity involving two
surfaces of a tooth.
 Complex Cavity: Cavity involving more than
two surfaces of a tooth.

13. III. Finn’s Modification of
Black’s Cavity Preparation for
primary teeth
 Class I: Cavities involving pits and fissures of molar
teeth and the buccal and lingual pits of all teeth
 Class II: Cavities involving proximal surfaces of molar
teeth with access established from the occlusal surface.
 Class III: Cavities involving proximal surfaces of anterior
teeth, which may or may not involve a labial or lingual
extension.
 Class IV: Cavities of proximal surfaces of an anterior
tooth, which involves the restoration of an incisal angle.
 Class V: Cavities present on the cervical 3rd of all teeth,
including proximal surface where the margin of ridge is
not included in the cavity preparation.

14. Baume’s Classification
 A) Pit And Fissure Cavities
 B) Smooth Surface Cavities

15. Mount And Hume
Classification (1998)
 This new system defines the extent and
complexity of a cavity and at the same
time encourages a conservative
approach to the preservation of tooth
structure.
 This system is designed to utilize the
healing capacity of enamel and dentin.

16. Three Sites of Carious
Lesions
Site 1:
Pits, fissures and enamel defects of
occlusal surfaces of posterior or other
smooth surfaces.
Site 2:
Proximal enamel immediately below areas
in contact with adjacent teeth.
Site 3:
The Cervical 1/3rd of the crown or,
following gingival recession, the exposed
root.

18. Four Sizes of Carious
Lesions
Size 1:
Minimal involvement of dentin just beyond
treatment by remineralization.
Size 2:
Moderate involvement of dentin. Following cavity
preparation, remaining enamel is sound, well
supported by dentin and not likely to fail under
normal occlusal load. The remaining tooth
structure is sufficiently strong to support the
restoration.

19. Size 3:
The cavity is enlarged beyond moderate.
The remaining tooth structure is weakened
to the extend that cusps or incisal edges are
split, or are likely to fail or left exposed to
occlusal or incisal load. The cavity needs to
be further enlarged so that the restoration
can be designed to provide support and
protection to the remaining tooth structure.
Size 4:
Extensive caries with bulk loss of tooth
structure has already occurred.