Contraindications The main contraindication for use of composite for Class III, IV, and V restorations is an operating area that cannot be adequately isolated. The reverse order would be followed when the restorative material is inserted.
9: Class III, IV, and V Direct Composite and Glass Ionomer Restorations
Class 3 Prep Flashcards
The cutting instrument is directed perpendicular to the enamel surface but at an entry angle that places the neck portion of the bur or diamond instrument as far into the embrasure next to the adjacent tooth as possible; light pressure and intermittent cutting brush stroke are used to gain access into the preparation. A, Incisogingival section showing axial wall 0.
Extensions should be minimal, including only the tooth structure that is compromised by the extent of the caries lesion or defect.
Obtaining access to the defect may include removal of sound enamel to access carious dentin. The facial enamel is conserved for enhanced esthetics.
B, Isolated area of operation. Lesion extending onto root surface.
Composite class 3 and class 5. B, Isolated area of operation.
No matrix is needed for class V restorations because the contour can be controlled as the composite restorative material is being inserted. The rubber dam is first stretched gingivally on the side from which the wedge is insertedthen released gradually during wedge insertion Fig.
The matrix usually is applied and stabilized with a wedge before application of the adhesive because it helps contain the adhesive components to the prepared tooth.