Asalaam Alekum
11/12/2014
Class III, IV & V Composite Cavity
Preparations
Dr. Gaurav Garg (M.D.S.)
Lecturer, College of Dentistry
Al Zulfi, M.U.
Contents
 General considerations- Indications & Contraindications
 Clinical Technique
Initial clinical procedures
b. Class III cavity preparation
c. Class IV cavity preparation
d. Class V cavity preparation
 References & Suggested readings
a.
Indications
 Esthetic prominent areas
 Operating area can be adequately isolated to attain an
effective bond
 Tooth preparations have all-enamel margins (Best).
Contraindications
 Operating area that cannot be adequately isolated
 Class V restorations in areas that are not esthetically critical
 Restorations that extend onto the root surface.
CLINICAL TECHNIQUE
INITIAL CLINICAL PROCEDURES
 Anesthesia may be necessary for patient comfort, and if
used, will help decrease the salivary flow during the
procedure
 Occlusal assessments should be made to help in properly
adjusting the restoration's function and in determining the
tooth preparation design.
 The shade must be selected before the tooth dehydrates
 Proper Isolation to permit effective bonding
Class III Cavity preparation
 Cavity Designs:
A.
Conventional- when caries is
entirely on root surface
C
B.
Beveled Conventional- When
the cavity is large & have enamel
margins. Bevel is given at an angle
of 45° to the cavosurface
B
C.
Modified- When the carious
lesion is small & easily accessible
Class III Cavity preparation
D. Combination design- cavity margins both on
enamel (beveled) & dentin
Enamel Bevel
Gingival retention groove
Approach to class III lesion
Bur is held perpendicular to
enamel surface, and initial
opening is made close to
adjacent tooth at
incisogingival level of caries.
B. Correct angle of entry is
parallel to enamel rods on
mesiolingual angle of tooth.
C. Incorrect entry overextends
lingual outline.
D. Same bur or diamond is used
to enlarge opening for caries
removal and convenience
form while establishing initial
axial wall depth.
A.
Lingual Approach
Class IV cavity preparation
 Cavity Designs:
A. Beveled conventional
B. Modified
Class V cavity preparation
 Cavity designs:
A. Conventional
B. Beveled
conventional
Beveled conventional
C. Combination
D. Modified
Modified
References & Suggested reading
 Sturdevant's art & science of operative dentistry-2006-
Theodore M. Roberson, Harald O. Heymann, Edward J. Swift, Jr.
 Principles of operative dentistry (2005)- A.J.E. Qualtrough, J.D.
Satterthwaite, L.A. Morrow and P.A. Brunton.
 Fundamentals of Operative Dentistry- 2nd Edition- Summitt &
Robbins