Planning and Making Crowns and Bridges

Planning and Making Crowns and Bridges

Language: English

Pages: 336

ISBN: 0415398509

Format: PDF / Kindle (mobi) / ePub

This highly successful text, which has achieved wide acclaim among practitioners and is a recommended text in the major dental schools, has again been revised and updated to keep it at the forefront of clinical practice. As before, the intention is to help solve real clinical problems by guiding dentists to make the right initial decision and then carry it through. This new edition includes significantly expanded material on veneers and implants in particular, so as to help dentists advise patients in their choice of what to do and how to make informed choices

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production of porcelain crowns using the die of the tooth (Figure 1.16a). The chair-side system consists in milling a porcelain inlay from a design produced in a computer from a three-dimensional video image of the prepared tooth. This, of course, requires a very complex, sophisticated and expensive piece of equipment (Figure 1.16b). It is too soon to say whether this approach to dental restorations (CAD/CAM or computer-aided design/computer aided manufacture) will be revolutionary or will stay

crown Figure 2.5 Post shapes. a Cast gold post and core (tapered-smooth shape). The surface has been grit-blasted to improve retention. a b A parallel-sided, serrated post system. This manufacturer produces five diameters ranging from 0.9 to 1.75 mm. This is the middle of the range, 1.25 mm diameter. From the left: a twist drill with a rubber disc which can be moved up and down to set the length, a smooth plastic impression post, a stainless steel serrated post which can be used in the direct

problem with retention. Crown lengthening usually involves the removal of healthy alveolar bone, and is therefore destructive, and is quite uncomfortable for the patient. Alternative means of improving retention should therefore be used whenever possible, and crown lengthening should be reserved for those cases where part of the purpose is to move the gingival margin apically for aesthetic reasons or where alternative means of retention are considered to have a poor prognosis. Related to the

single porcelain powders. Others find the combination of shades on the commercial shade guides confusing, and grind off the neck (which often has surface stain added) and incisal portions, leaving a single body shade. Planning the impression The impression technique should be decided before preparing the tooth. Some impression materials are better used in a special tray, and this is made on the study cast. Other impression materials can be used in stock trays. If a stock tray is used it must be

nozzle adapted with a fine curved tip for direct use in the mouth. f The automix gun being used in the mouth. g A mixing machine for polyether impression material. 160 Clinical techniques for making crowns h Material being delivered directly into a stock tray. i A disposable plastic syringe being used to place impression material. are mixed together. The reversible hydrocolloid is based on agar. It is melted in a water bath and sets on cooling. The teeth must be dry for elastomeric

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