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At least 1,639 records · Page 91Linked to original sources
PubMed1976

The use of plaster casts in the treatment of fractures of the femoral shaft.

In order to relieve the pressure on an overworked fracture service, the early mobilization of patients with fractures of the femoral shaft in plaster casts was investigated. The cast is designed to have a weight-relieving function and to mould the soft tissues of the thigh around the fracture. Using this method, 40 patients were discharged from hospital in an average of 44 days from injury and all their fractures healed rapidly and successfully.

Adolescent↗
PubMed1984

The recovery of quadriceps function in patients treated by cast bracing.

The recovery of quadriceps function in patients treated by cast bracing has been assessed in fifty-four patients. The isometric strength and dynamic endurance of the quadriceps muscle were measured at an average of 2 years 8 months after the fracture. The literature is reviewed and a simple method of measurement is described. The results indicate that the recovery of quadriceps function after cast bracing in an unselected group of patients compares favourably with that after open and closed nailing techniques.

Adolescent↗
PubMed1986

Cast-brace treatment of ankle sprains.

Forty-two severely sprained ankles treated by a cast-brace have been reviewed. This method was devised to avoid the disadvantages of immobilization. Diagnosis was based on the history and clinical signs. Strain films were taken in 31 patients but it is submitted that this investigation may be misleading unless general anaesthesia is used. The results of the treatment by cast-brace compare favourably with those by other methods and it is considered that patients were able to return to sport in a shorter time.

Ankle Injuries↗
PubMed1979

A comparison of the casting accuracy of base metal and gold alloys.

The casting accuracy of three alloys was compared, and statistically significant differences in the dimensions of each alloy were demonstrated when the frameworks were compared to their respective master casts. There are certain problems with the accuracy of each alloy studied; thus framework try-in appointments and wrought wire clasps soldered to the finished framework are advocated.

Chromium↗
PubMed1979

Casting a gold alloy to embedded precision attachment metals.

The technique for casting a gold alloy to embedded attachment metals has been described. The joints of gold alloy cast to commercially available attachment metals were examined with a metallurgic and a scanning electron microscope. The investigation indicated that an uninterrupted gapless joint is possible, and that some diffusion occular along the interfaces with some attachment metals. In view of these findings, it is concluded that this technique can be recommended as a dental laboratory procedure.

Dental Alloys↗
PubMed1980

The cast aluminum denture base. Part I: Rationale.

Experiments with various casting techniques have been done, and aluminum base dentures have been made for many patients. The subjective clinical response from patients wearing aluminum dentures has not been different from patients wearing acrylic resin dentures. However, Brudvik and Holt have stated that they have had marked clinical success in using aluminum bases. A literature review on using aluminum as a denture base material has been presented, and the rationale for its use has been discussed. In part II, a technique will be described that can be used for casting aluminum denture bases.

Aluminum↗
PubMed1984

Preliminary observations on clinical use of a base metal casting alloy.

A study was conducted to develop a laboratory technique and to evaluate the clinical efficacy of a base metal casting alloy. Slight modification of recommended investing procedures is required to produce consistently well-fitting castings with the test alloy. After 12 months of clinical service, the test alloy did not differ from the control alloy in tarnish, untoward gingival response, resistance to abrasion, or tooth sensitivity.

Chemical Phenomena↗
PubMed1985

Radiographic detection of porosities in removable partial denture castings.

The purpose of this study was to discern the existence of structural defects in removable partial denture frameworks by means of radiographs. A simple technique was described using a dental radiograph unit and routine periapical dental films. All components of removable partial denture castings were radiographed with different angulations. The visibility of defects was clear. Structural defects were located and classified in two brands of removable partial denture base metal alloys (Ticonium and Nobilium) commonly used in fabrication of removable partial denture castings. The technique described is simple, inexpensive, not time-consuming, and can be implemented with minimum instrumentation. Future studies with this radiographic method for investigation of internal defects in fixed prostheses or dental implants are recommended.

Chromium Alloys↗
PubMed1985

Laboratory accuracy in casting removable partial denture frameworks.

An attempt was made to compare the clinical accuracy of two types of cast metals used in the fabrication of removable partial dentures as they were prepared by commercial laboratories. No comparison of the metals could be made, because the discrepancies that were found were too gross and were related to technical error. Suprabulge clasps were placed in less undercut than prescribed. Infrabulge clasps were placed in more undercut than prescribed. The laboratories produced better accuracy when they were informed of the purpose of the cast frameworks than when the frameworks were made without the knowledge that their work would be tested. One laboratory produced better results than the other under similar conditions.

Chromium Alloys↗
PubMed1985

Duplicate casts in fabrication of temporary removable partial dentures.

The use of blocked-out duplicate casts in the fabrication of temporary removable partial dentures has been described. Temporary removable partial dentures produced in this controlled manner fit properly and aid in minimizing intraoral damage. Accuracy of fit is assured because all relief is accomplished by block out on the surveyor during the laboratory phase rather than by random grinding of the prosthesis at insertion. In addition, the original cast is salvaged and can be used as a meaningful reference during the finishing process in the laboratory (Fig. 5).

Dental Casting Technique↗
PubMed1986

Accuracy of one-piece castings, preceramic and postceramic soldering.

An investigation was conducted to evaluate the relative accuracy of one-piece castings of FPDs of three, four, and five units with those assembled by preceramic soldering and postceramic soldering. The preceramic soldered FPDs were subjected to six simulated porcelain firing cycles to assure a homogeneous sample. A total of 15 FPDs, five of each length, were evaluated for each test condition. A three-piece aluminum mold with stainless steel dies, which allowed for varying the length of the prosthesis, was used to fabricate the FPDs in 52% gold-palladium alloy. Marginal discrepancies of the castings on the dies were compared for the three test techniques. The mesiodistal length of the FPDs that were pre- and postsoldered were also measured at the occlusal and at the gingival margins and compared with the restorations before soldering.

Dental Casting Technique↗
PubMed1987

The cast glass-ceramic restoration.

The use of Dicor cast glass-ceramic material for fixed prosthodontic complete crowns has been described. The advantages of this material are chemical and physical uniformity, marginal accuracy, uncomplicated fabrication from wax-up to casting, ceramming, and coloring, ease of adjustment, excellent esthetics resulting from natural translucency, light absorption, light refraction, and natural color for the crown, and its inherent resistance to bacterial plaque.

Color↗
PubMed1989

Veterans Administration Cooperative Studies Project No. 147/242. Part VII: The mechanical properties of metal ceramic alloys as cast and after simulated porcelain firing.

Comparison of mechanical properties of seven metal ceramic alloys in as-cast and heat-treated conditions resulted in significant differences. Tested alloys included one Au-Pd (control), three palladium-based, and three nickel-based alloys. Mechanical properties included strength, elongation, modulus, and microhardness. Twenty-four tensile bars were cast for each alloy. Twelve of the 24 bars for each alloy were randomly selected for heat treatment by the Ceramco technique. After heat treatment the Au-Pd alloy became stronger and harder and showed an increased elongation. The effects of heat treatment on the strength of the palladium-based alloys were variable, showing a decrease in hardness and an increase in elongation. The nickel-based alloys were weakened by the heat treatment and showed a decrease in hardness and an increase in elongation. Heat treatment did not significantly affect the modulus of any of the tested alloys.

Chemical Phenomena↗
PubMed1990

An experimental study on the influence of the derived casts on the accuracy of different recording materials. Part I: Plaster, impression compound, and wax.

An experimental study was conducted to analyze the accuracy of transferring jaw relations with recording materials and the derived casts. A specific measuring system was designed to determine three-dimensional deviations of the condyles of an articulator. Four interocclusal recording materials were analyzed after various storage periods. The results indicated that the accuracy of the derived cast had a critical influence on the accuracy of the transferred jaw relations. None of the materials were reliable; the most accurate material generated deviations of approximately 300 microns.

Analysis of Variance↗
PubMed1990

Multidimensional internal setting expansion of a phosphate-bonded casting investment measured with strain gauges.

Strain gauges were used to determine the setting expansion of phosphate-bonded casting investments. The gauges were placed at the approximate site of the wax pattern. The isotropy of the expansion was evaluated with multidirectional strain gauges that measured the difference in expansion in two orthogonal directions. A large difference was found between the setting expansion measured externally (1% to 1.5%) and the method described here (0.01%). For casting rings lined with a nonasbestos layer, no statistically significant differences were found in the setting expansion parallel to the long axis of the ring and the expansion in the direction perpendicular to the long axis.

Dental Casting Investment↗
PubMed1990

Slip-cast zirconia dental roots with tunnels drilled by laser process.

Zirconia was used in this study for implant dental roots because of its superior properties over other materials used as dental roots in mechanical strength, toughness, workability, and biocompatibility. Zirconia blades were formed by the slip casting method and tunnels were drilled in the laser processing. The results indicate that (1) the slip casting method has made it possible to form a complicated artificial dental root with an accurate shape and size; (2) the zirconia blade has adequate strength in occlusion; (3) the neodymium: yttrium-aluminum-garnet (Nd:YAG) laser machine can drill many tunnels of the same size in diameter by using it repeatedly under the same conditions of power, pulse width, and focus; (4) zirconia is a recommended material for laser processing from the standpoint of toughness and less heat conductivity; and (5) the opacity of zirconia to x-ray penetration presents better observation during and after implantation than other ceramics.

Biocompatible Materials↗
PubMed1990

A simplified technique for fabricating esthetic cast metal occlusal surfaces for dentures.

This article describes a simplified method for making esthetic cast metal occlusal surfaces. Monoplane posterior acrylic resin block teeth, cast in a nickel-chrome alloy, are coated with silane and an esthetic composite resin veneer is applied to the buccal surface. These veneered posterior metal teeth are incorporated in the wax setup and the dentures are processed and finished. The dentist's routine technique for delivering dentures to the patient can be followed.

Composite Resins↗
PubMed1991

A two-stage impression technique for the indirect fabrication of multiple cast dowel and cores.

Making an accurate impression of root canals prepared for cast dowel and cores can be impeded by the number of teeth involved and the working time of the impression material. These factors aside, the technique described can be used to obtain a detailed full-arch impression that precisely captures remaining tooth structure and all canal spaces. The two-stage technique involves first fitting tapered plastic sprues and making individual canal impressions. A full-arch pickup impression is then made to capture the individual canals. This simple and easily correctable procedure ensures an accurate master cast on which dowels and cores can be indirectly made.

Dental Casting Technique↗