PubMed Health⌕ Search

Biomedical subjects

M Goldfogel

Publications and source records attributed to M Goldfogel.

13 recordsLinked to original sources
PubMed1994

Restoring a failed prefabricated post and core with a sleeve casting: a clinical report.

A clinical case is described, and a technique is explained for making a custom sleeve cast post and core to salvage a fractured crown previously treated with an unretrievable prefabricated post. The restorative problem was to design and fabricate some sort of cast post and core that could be cemented to the remaining post. The amalgam and cement in the pulp chamber and coronal portion of the root canal were carefully removed so that a direct pattern could be made to form a tube which would surround the coronal part of the existing post like a sleeve. This sleeve casting was designed to provide attachment for a core to support a new restoration. This direct pattern technique results in a retained core that joins the already cemented post and provides a sound core for the retention of a new crown.

Crowns↗
PubMed1994

A technique for developing a master cast with previously made dies.

This article describes a technique for preparing final working casts to be used in the laboratory phase of restorative treatment. The goal is to produce accurate working casts that have stable dies which are easily removed from the base and reliably replaced. Most casts with removable dies are made from a single master impression. However, individual dies are sometimes made previously from individual tooth (preparation) impressions. In such cases, transfer copings are required to relate the dies and produce the final working cast. Hollow plastic casting sprues are used as temporary dowels in this technique until a transfer coping pickup impression has been made. After the dies are seated and secured in the transfer coping pickup impression, the plastic casting sprues are replaced with conventional brass dowel pins. This technique ensures well-placed dowel pins that will facilitate easy and accurate withdrawal and replacement of the dies.

Dental Casting Technique↗
PubMed1991

Transfer copings made of a visible light-cured resin.

The treatment of complex fixed partial dentures and multiple-unit castings often requires intermediate procedures for the transfer of tooth relationships from the patient's mouth to the working model. Transfer copings used when multiple teeth have been prepared and the individual dies require accurate seating on the working cast. Transfer copings are commonly made of autopolymerizing acrylic resins. The use of these materials may present difficulty. A technique for making transfer copings by use of a visible light-cured resin is presented.

Acrylic Resins↗
PubMed1990

Direct technique for the fabrication of a visible light-curing resin provisional restoration.

A properly fabricated provisional restoration will, among other things, provide acceptable esthetics. Although many materials have been used for provisional restorations, when esthetics is of primary concern, the choice is limited to tooth-colored resin materials. Recently, a tooth-colored, light-activated urethane dimethacrylate resin has been developed. This material has been reported to be useful for many prosthetic applications, including the indirect fabrication of provisional restorations. This paper presents a technique for the direct fabrication of single-unit provisional restorations using this material. The physical properties of this resin and the advantages and disadvantages of the technique are also discussed.

Acrylic Resins↗
PubMed1985

Dimensional change of acrylic resin tray materials.

Twelve commonly used acrylic resin tray materials were compared for linear curing shrinkage. Three of the 12 were found to expand slightly during the first few hours, which had the effect of reducing the net shrinkage. All trays, however, exhibited shrinkage during the 24-hour test period. Therefore, autopolymerizing acrylic resin tray materials should not be used for an impression the same day that they are made unless the tray is boiled as suggested by Pagniano et al. This agrees with research already completed even though the magnitude of shrinkage was considerably less than that reported in previous studies.

Acrylic Resins↗
PubMedDate not supplied

All-porcelain labial margin for ceramometal crowns.

The elimination of the labiogingival metal collar of a porcelain-fused-to-metal (PFM) restoration is an attempt to achieve an improved esthetic result. In their expectation of a more cosmetic tooth restoration, patients may influence dentists to use the all-porcelain labial margin to avoid metal showing in the final restoration. Success of this type of restoration depends upon proper tooth preparation. The all-porcelain margin requires a 1.2-mm wide labiogingival shoulder of approximately 70 or 90 degrees wrapping into the interproximal area. Much of the effectiveness of the restoration depends upon the design of the metal substructure. The following change is made in the design of this substructure for this modified PFM crown: the labiogingival portion of the metal is finished back to the gingival-pulpal line angle with the metal against the axial wall being from 0.3 mm to 0.5 mm thick. This allows for 0.2 to 0.3 mm of opaque and 0.7 to 1.0 mm of shoulder porcelain. The direct lift-off technique is a useful method of achieving clinically acceptable all-porcelain margins. Such restorations may give excellent results.

Crowns↗