Class 2. Step 2 Primary resistance form. Final cavity preparation stage. Keep the bur parallel to the long axis of the tooth. Class I, II, and VI Direct Composite Restorations. Black’s Classification Of Cavity PPT. Class 1. Two outline forms can be appreciated Black's classification system defines five classes of cavity (the sixth class was added later): Class I cavities are in the pits and fissures (cracks) in your teeth. Class 2. Extend the no.330 bur into the proximal surfaces. Displaying class 1 cavity preparation for amalgam PowerPoint Presentations. Use a no.330 bur to extend the occlusal outline through the marginal ridge. Academia.edu is a platform for academics to share research papers. Class 4: Proximal surfaces of anterior teeth involving incisal angle. 1-7 Because of the improved physical properties of composites and bonding systems, studies typically report successful results for their use in posterior teeth. Class 5: Gingival third of facial or lingual surfaces of all teeth. Class 6: Cusps of posterior teeth. Depending on the cuspal incline, the depth of the prepared external walls is 1.5 to 2 mm (Fig. www.FourthMolar.com Class II cavity preparation for amalgum restoration. Class 5. Class 6. This restoration shows an old amalgam that needs to be replaced with composite. G.v. G.V. Step 3 Primary retention form. When a Class II carious lesion exists without involvement of the occlusal, a slot cavity is prepared which is essentially the proximal portion of the Class II preparation. The depth of the preparation is modified as needed so that the pulpal wall is established 0.1-0.2 mm into dentin. 14-3, D and E). Presentation Summary : Cavity preparation is the mechanical alternation of defective, injured or diseased tooth in order to best receive a restorative material that will reestablish a. Posterior composite restorations were introduced in the late 1960s and early 1970s. Class 4. It is the placement of cavity margins in the positions they will occupy in the final preparation, except for finishing enamel walls and margins and preparing an initial depth of 0.2 – 0.8mm pulpally of DEJ or normal root surface position. Then place your cavity liner into the preparation before placement of a microhybrid or nanofill dental composite so you can clearly identify the composite on an X-Ray. CLASS I. Class 3. After the amalgam is removed, the tooth is prepped. Stages and Steps in Cavity Preparation. Initial cavity preparation stage. Amalgam Cavity Preparation Class 1 - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. Place bonding agent in a thin layer. Initial cavity preparation stage Step 1 Outline form and initial depth. Move the bur in a pendulating motion from lingual to buccal. Complete a class 1 cavity outline. Class II cavities are on the sides and chewing surfaces of your premolars and molars in the back of your mouth. Class 1. Black proposed a classification of carious lesions. 14-3, D and E). The 1.5 mm pulpal depth is measured at the central fissure (Fig.