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.

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

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: 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

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. 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

Class IV cavity preparation Cavity Designs: Beveled conventional Modified

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

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