Cast bridge

Inl y Casting Waxes. The three types of inlay casting waxes, ie, types A, B, and C, are used to produce wax patterns for the lost wax casting process in the production of cast gold inlays, crowns, and bridges. Some inlay wax is also used to produce patterns for acryflc restorations. 

Type IV, extra hard (partial denture) alloys, are indicated where high strength, hardness, and stiffness are requked. They are harder, stronger, and less ductile than the type III alloys. These partial-denture alloys are used for cast removable partial dentures, precision-cast fixed bridges, certain three-quarter crowns, saddles, bars, arches, and clasps. 

Cobalt—Chromium Alloys. Co—Cr and Ni—Cr alloys are used predominately for the casting of removable partial dentures fixed partial dentures (bridges), crowns, and inlays are also cast. Because of high hardness, corrosion resistance, and wear resistance cobalt-chromium alloys are used for bite adjustments and as serrated inserts in plastic teeth used in fliU dentures. These alloys are well tolerated by the body and also are used for dental implants and orthopedic implant alloys. 

Ni—Cr alloys primarily contain nickel with ca 12% or more of chromium. They are used mainly for the casting of fixed partial dentures (bridges), crowns, or inlays, either with or without aesthetic porcelain or plastic veneers (Table 10). However, some of them are used for removable partial dentures. 

Casting of Ti alloys for crowns and bridges is done in investment molds that have been allowed to cool almost to room temperatures after firing. The castings are cleaned in electrolytic solutions or in special chemical polishing solutions that impart a bright smooth surface finish to the casting... 

Uses. Dental solders and fluxes are used to join orthodontic wires, fasten attachments to partial dentures, repair castings units, and join crown and bridge units either before or after the appHcation of porcelain. They may also be used to repair fixed and removable dental appHances. 

Fig. 1.4. Magdalene Bridge built in 1 823 an the site of the ancient Saxon bridge over the Cam. The present cast-iron arches carried, until recently, loads far in excess of those envisaged by the designers. Fortunately, the bridge has now undergone a well-earned restoration.

Figures 40-43 compare the position of the bridging carbonyl group in each diastereomeric pair and the effects of stereochemistry on their force-area curves at 25°C. It is clear that there is a large effect of stereochemistry on the energetics of compression and expansion for a wide variety of ketodiacid surfactants all of the ketodiadds in this study showed a dependence of the shapes of their IT/A isotherms on their stereochemistry. Several facts are striking. In every case there is a sharp differentiation between the behavior of films cast from meso- and ( )-isomers. The isotherms for the...

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