PPT-Tooth Preparation for silver amalgam restorations

1 2 3 4 INITIAL DEPTH 5 OUTLINE FORM FOR MANDIBULAR FIRST MOLAR 6 Outline Form Establishing outline form means 1 Placing preparation margins in positions they will occupy in the final preparation except for finishing enamel walls and margins. A Class II preparation. No. 245 Bur . Pear shaped bur No. 330. INITIAL DEPTH. Initial depth is 1.5 mm from the central pit or 0.2-0.5 mm into dentin or 2mm from the prepared . buccal. and lingual walls.. Dr . Rakesh. Kumar . Yadav. INTRODUCTION. Most of the teeth can be restored with amalgam and composite but if large crown portion lost due to caries or some other reasons, the remaining tooth structure is decrease and difficult to obtained resistance and retention form so prepare dentine lock and slot but when these retention features are insufficient to provide desired retention then pin supported restorations are used. . Cl. Ι :. - Pits . and fissure caries. - Upper . anterior teeth palatal pits. - Posterior . teeth . occlusal. . surface. Cl. ΙΙ:. Posterior teeth proximal . surface.  . Cl. ΙΙΙ . :. Anterior teeth proximal surface ( not involving the . Class I Amalgam Restoration. Conservative Approach. Cavity width : . ¼ intercuspal distance (1 – 1.5 mm).. Depth : . 1.5 – 2 mm. Indications. Moderate to large restorations.. Restorations that are not in . why. it is . banned. in . Norway. Dental amalgam. Anette. . &. Jenny. Scandinavia. ban . the. . use. . of. amalgam. In 1998 proposed a law that would gradually discontinue the use of mercury. principles cavity preparation. Dr. . AbdulAziz. . N. . Maher. Definition of tooth preparation. Mechanical alteration . of . defective. ,. injured. , or . diseased. tooth to best . receive. restorative material . Introduction. Dental . amalgam has been in use for more than 175 years and has been used for hundreds of millions of restorations. .. This . material is used to restore teeth with . decay.. It . is one of the materials used for direct restorations include, silver amalgam, composite resin and gold foil.. A Class II preparation. No. 245 Bur . Pear shaped bur No. 330. INITIAL DEPTH. Initial depth is 1.5 mm from the central pit or 0.2-0.5 mm into dentin or 2mm from the prepared . buccal. and lingual walls.. MSc.operative. dentistry. Terminology. Silver paste. an alloy, one of the constituent of . which is mercury. an alloy made by mixing Hg with . Ag . dental amalgam alloy. components. 1. Silver ( Ag) 48- 70%. INDEX. INTRODUCTION. OBJECTIVES OF CAVITY PREPARATION. FACTORS AFFECTING CAVITY PREPARATION. TERMINOLOGY. CLASSIFICATION. PRINCIPLES OF CAVITY PREPARATION. TOOTH PREPARATION-BEYOND G.V.BLACK. CONCLUSION. Dr. S. Mukhtar-un- Nisar Andrabi. Assistant Professor. . Conservative . Dentistry & Endodontics . Contents. Introduction . Historical Perspective. Indications & Contraindications . Advantages & Disadvantages . Syed. . Mukhtar. Un . Nisar. . Andrabi. Introduction . Complex posterior restorations are used to replace . missing tooth . structure of teeth that have fractured or are . severely involved . with caries or existing restorative material. Dr. . . KaramAhmed. Operative Dentistry. Conservative Dentistry. It’s the art and science of . diagnosis,. . treatment. and . prognosis. of defects of teeth. Such treatment should result in:. Goals. Assistant Professor,. Conservative Dentistry & Endodontics. Overview. History. Basic composition. Basic setting reactions. Classifications . Manufacturing. Variables in amalgam . performance. History .