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Class III, IV & V Composite Cavity Preparations

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Presentation on theme: "Class III, IV & V Composite Cavity Preparations"— Presentation transcript:

1 Class III, IV & V Composite Cavity Preparations
11/12/2014 Asalaam Alekum Class III, IV & V Composite Cavity Preparations Dr. Gaurav Garg (M.D.S.) Lecturer, College of Dentistry Al Zulfi, M.U.

2 Contents General considerations- Indications & Contraindications
Clinical Technique Initial clinical procedures Class III cavity preparation Class IV cavity preparation Class V cavity preparation References & Suggested readings

3 Indications Esthetic prominent areas
Operating area can be adequately isolated to attain an effective bond Tooth preparations have all-enamel margins (Best).

4 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.


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

7 Class III Cavity preparation
Cavity Designs: Conventional- when caries is entirely on root surface Beveled Conventional- When the cavity is large & have enamel margins. Bevel is given at an angle of 45° to the cavosurface Modified- When the carious lesion is small & easily accessible C B

8 Class III Cavity preparation
D. Combination design- cavity margins both on enamel (beveled) & dentin Enamel Bevel Gingival retention groove

9 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. Correct angle of entry is parallel to enamel rods on mesiolingual angle of tooth. Incorrect entry overextends lingual outline. Same bur or diamond is used to enlarge opening for caries removal and convenience form while establishing initial axial wall depth. Lingual Approach

10 Class IV cavity preparation
Cavity Designs: Beveled conventional Modified

11 Class V cavity preparation
Cavity designs: Conventional Beveled conventional Combination Modified Beveled conventional Modified

12 References & Suggested reading
Sturdevant's art & science of operative dentistry 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


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