Different Designs of Class V Cavity Preparations

Class V Tooth Preparations

• The groove retention form is used to provide additional retention for the restoration in Class V tooth preparations.
• Retention grooves on the incisal aspect are rarely required in Class V cavity preparations because the occlusal surface of the tooth provides sufficient retention.
• Glass ionomer material is the material of choice for restoring Class V cavities when the lesion is close to the pulp or when aesthetics is not a concern.
• Glass ionomer material is preferred over resin modified glass ionomer (RMGI) in certain cases due to its superior biocompatibility and ability to release fluoride.
• A fissure bur can be used to define the internal angles in cavity preparations.
• The initial axial depth inside the DEJ (Dentino-Enamel Junction) for the preparation is 0.2 mm.
• The facial and lingual walls of the preparation provide no inherent retention.
• A 1/4 round bur is used to prepare two retention grooves.
• The purpose of Class V tooth preparation for small or moderate lesions or defects is to remove decay, prepare the tooth for restoration, and prevent further decay.
• Beveling is performed all around except at the gingival margin.
• The overall form of small or moderate Class V tooth preparations is conical.
• The primary determinant for the outline form of a Class V amalgam tooth preparation is the shape and size of the lesion.
• The recommended axial depth for cavo-surface margins in Class V amalgam tooth preparations is 0.5 mm.
• A round bur is indicated for areas inaccessible to a fissure bur.
• Class V tooth preparations are located on the facial or lingual surfaces of the tooth.
• The recommended taper of the fissure bur for entering the caries lesion is 12-15°.
• The enamel is considerably thicker occlusally and incisally than cervically.
• The axial depth should be at least 0.2 mm inside the DEJ for Class V amalgam tooth preparations.
• The primary factor affecting the outline form for Class V amalgam tooth preparations is the shape and size of the lesion.
• A fissure bur may be used for the initial tooth preparation in Class V amalgam tooth preparations.
• The recommended total axial depth for Class V amalgam tooth preparations is 1.5-2 mm.
• The primary factor affecting the outline form for Class V amalgam tooth preparations is the shape and size of the lesion.
• The recommended axial depth inside cementum for cavo-surface margins in Class V amalgam tooth preparations is 0.5 mm.