essay 15 - class V cavity prepartion for composite materials - indications, stages of prepartion, comparative evaluation of class V cavities for composite materials, amalgam and indirect restorations

what are class V prepartions?

• restorations on gingival third of facial or lingual surfaces of all teeth

Indication for class V cavity preparation for composite materials

• most class V lesions in aesthetic zones

• lesions that can be adequately isolated

• shallow or moderate caries with enamel margins

contraindication for class V cavity preparation for composite materials

• poor isolation (e.g excessive gingival bleeding)

• deep root lesions with no enamel margin

• low aesthetic demand areas where amalgam is sufficient

Modified class V preparation for composite (most common)

• used for small/moderate lesions

• ‘‘scooped out’’ form

• no groove retention

• minimal depth: -0.2mm into dentin, only if needed

• no sharp line angles, walls may be divergent

Conventional class V preparation for composite

• used for root surface lesions

• 90 degree cavosurface margin, 0.75 mm depth

• may include groove retention if needed

Bevelled conventional class V preparation for composite

• for larger lesions with enamel margins or to replace a defective conventional preparation

• Initial 90 degree prep, followed by 0.25-0.5 mm enamel bevels

• Bevels made with flame-shaped or round diamond

• enhances bonding and aesthetics

retention used for composite

• micromechanical bonding

• etched enamel + adhesive = strong bond

• bevels increase surface are, reduce microleakage

• groove retention only for root areas or large preps