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Biomedical subjects

C Passon

Publications and source records attributed to C Passon.

6 recordsLinked to original sources
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↗
PubMedDate not supplied

The effect of multiple layers of die-spacer on crown retention.

The application of die-spacer to crown preparation dies prior to the fabrication of the cast crown is an acceptable procedure to improve the fit of the restoration. Previous studies have shown that the retention of the restoration will be improved, unchanged, or reduced when an appropriate thickness of die-spacer is used. No studies have determined the effect on retention if excessive die-spacer is used. This study evaluated the effect of increasing die-spacer thickness on the retention of cast full crowns. Cast copings were fabricated on dies coated with either 0, 4, 8, 12, or 16 coats of die-spacer, cemented on the respective teeth, and removed using an Instron Universal Testing Machine. There were no statistically significant differences (P < or = 0.05) between the mean force required to remove the cemented copings. It appears that increasing the application of die-spacer up to 16 coats (151 micrometers) does not adversely affect the retention of cemented cast copings.

Analysis of Variance↗
PubMedDate not supplied

Enhanced prosthetics using the gingival mask.

The removal and trimming of working model dies destroys important soft tissue information. Features such as the gingival sulcus, interdental papilla, and ridge form are often destroyed. The loss of these features makes the fabrication of correct restoration contours difficult. Using the gingival mask will restore vital soft tissue as well as hard tissue information. This paper discusses the gingival mask, its advantages and disadvantages, and describes the direct and indirect methods of fabrication. Whatever method is employed, the gingival mask will prove to be a valuable adjunct for improving the quality and esthetic values of the fixed prosthesis.

Dental Impression Technique↗