Class III restorations are indicated for defects located on the proximal surface of anterior teeth that do not affect the incisal edge. Part of the facial or the lingual surfaces also may be involved in Class III restorations. Class V restorations are indicated to restore defects on the facial or lingual cervical one third of any tooth. The Class III amalgam restoration is rarely used. Its use has been supplanted by tooth-colored restorations primarily composite , which have become increasingly wear-resistant and color-stable.
Class III Cavity Preparation
9: Class III, IV, and V Direct Composite and Glass Ionomer Restorations | Pocket Dentistry
It also presents information about any differences in these classes of restorations when a glass ionomer type of material is used for the restoration. The specific material qualities and properties that make composite the best material for most Class III, IV, and V restorations relate mainly to esthetics. Other qualities include adequate strength and the benefits of bonding to tooth structure, often resulting in removal of less tooth structure during preparation. Many Class V restorations that are in esthetically prominent areas also are appropriately restored with composite or other tooth-colored materials. In all of these instances, the operating area must be isolated adequately to attain an effective bond.
15: Class III and V Amalgam Restorations
When teeth develop carious lesions or undergo fracture or loss of substance due to abrasion or erosion, cavity preparation is warranted. Cavity preparation designs vary according to extent of damage and the type of restorative material to be used. Special drilling instruments are used at varying speeds in combination with hand instruments for cavity preparation. The challenge with cavity preparations is that they must be completed with great care so that all important design features are incorporated while at the same time avoiding encroachment onto the underlying vital pulpal tissues which are contained as a core within the teeth.
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