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Results for “DENTAL IMPRESSION MATERIALS”

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At least 415 records · Page 23Linked to original sources
PubMed1987

A study of bubbles in a rubber elastomer manipulated under clinical conditions.

One hundred addition reaction silicone impressions were made by students and faculty members using two types of syringes with two syringe tip sizes. A count of the bubbles in the impressions revealed a total of 439 with only one impression completely free of bubbles in either the posterior or anterior test regions. Faculty members, presumably more experienced, confirmed the last out-fewer bubbles hypothesis developed in a previous laboratory investigation, but some students did not. A pneumatically activated syringe produced no fewer bubbles than did the conventional hand-powered syringe but most of the students and faculty members thought it was advantageous. Half believed that more practice with it would be beneficial. We recommend that practicing dentists try to minimize bubbles by extruding the first part of the syringe contents onto the mixing pad or in a distant intraoral location before injecting around the critical tooth preparations.

Air↗
PubMed1987

Infection control during elastomeric impressions.

This technique uses an individual applicator per application of an elastomeric adhesive to an acrylic resin tray. To help prevent contamination of the adhesive in the bottle, the Toothette toothbrush should not be dipped into the bottle a second time. A sufficient quantity of adhesive is absorbed with a single immersion into the adhesive to coat an entire tray. The uniformity of the surface application is more easily controlled compared with that of a brush applicator. Because only one immersion is required to coat a tray and the Toothette toothbrush is discarded after one application, cross-contamination of patients is prevented.

Communicable Disease Control↗
PubMed1988

An alternative method of border molding.

An alternative method of border-molding using a syringe to place the impression compound is more efficient and allows border molding of an entire quadrant at a time. This method enables the dentist to deliver an even flow and control the amount of impression compound expressed in a neater and clearer manner.

Dental Impression Materials↗
PubMed1989

Interocclusal wax impressions for use in provisional and associated fixed prosthodontic procedures.

A procedure is presented for the construction of a direct provisional acrylic resin restoration by means of an interocclusal wax impression. This technique requires no preparation or laboratory time and quickly results in a restoration that accurately covers all margins of the preparation and restores proper contact, contour, and occlusion. This procedure can also be used for large restorations, immediate fixed partial dentures, final impressions of preparations, provisional crowns to fit existing removable partial dentures, and some office emergencies.

Acrylic Resins↗
PubMed1989

An improved technique for bite mark impressions.

This article demonstrates a technique for making a custom tray over a bite mark and making an accurate impression of the mark. This technique is cleaner and easier than previously published methods, and causes no undue thermal trauma to living patients.

Bites and Stings↗
PubMed1991

Bacterial contamination in reversible hydrocolloid conditioning units.

Four hydrocolloid conditioning units were randomly tested for bacterial contamination. All were contaminated beyond the United States Army's acceptable limit of potability. The predominant bacteria were identified. A discussion of clinical significance and proposals for aseptic technique are presented.

Bacteria↗
PubMed1991

The transmandibular implant: prosthodontic treatment considerations.

The transmandibular implant (TMI) is a type of transosteal implant designed for use in the edentulous mandible. The implant is composed of a gold-based alloy. The TMI is a loaded implant in that the prosthesis is supported by the implant. A transitional type of prosthesis, for insertion following surgery can be made either by altering the patient's existing mandibular complete denture or by making a new denture. The completed prosthesis is retained by clips held in the mandibular denture with autopolymerizing acrylic resin. The clips engage Dolder bar segments, which are a part of the implant suprastructure, and provide the necessary retention for the mandibular complete denture.

Acrylic Resins↗
PubMed1992

An impression technique to make a new master cast for an existing removable partial denture.

When the master cast for a removable partial denture is lost and a well-fitting framework remains, it may be necessary to replace the master cast. A two-step impression procedure is described that combines the altered-cast technique and the use of a modified disposable tray. Finger pressure is maintained on the major connector throughout the making of both impressions, to prevent framework movement and loss of contact with prepared rest seats.

Acrylic Resins↗
PubMed1992

Comparison of vertical movement occurring during loading of distal-extension removable partial denture bases made by three impression techniques.

Although the altered-cast impression technique attains stability and controlled tissue support for distal-extension removable partial dentures, the procedure is time-consuming and technique-sensitive. This study clinically compared the vertical displacement of distal-extension removable partial dentures made from different impression techniques. The impressions studied were the altered-cast impression, an impression made from a border-molded custom tray, and a stock tray irreversible hydrocolloid impression that served as a control. A post hoc analysis, using a Tukey Q-test, exhibited significance (p less than 0.01) between the two impression techniques after intraoral loading was performed. Although statistically significant, the 0.19 mm difference between the impression techniques may or may not be clinically relevant. Additional research is required in this area.

Alginates↗
PubMed1992

An alternative immediate complete denture impression technique.

An alternative immediate denture impression technique for extremely mobile teeth, utilizing amalgam condensers, has been presented. The apically applied pressure on the mobile teeth minimizes the risk of accidental tooth extraction during impression removal.

Alginates↗
PubMed1993

Evaluation of three impression techniques for osseointegrated oral implants.

The purpose of this in vitro investigation was to determine the accuracy of gypsum casts produced from impressions made with polyether, polyether and impression plaster, or polyether and acrylic resin for the fabrication of osseointegrated implant prostheses. Strain gauges were attached to a master framework to determine the passivity of fit of the framework to sample casts made by the three impression techniques. Strain values were statistically compared by one way analysis of variance and Duncan's multiple range test. A statistically significant difference was found between the three impression techniques tested (p < 0.05). The results of this investigation revealed that none of the impression techniques resulted in an absolutely passive framework fit. However, of the techniques tested, the polyether alone resulted in the closest duplication of the master cast.

Acrylic Resins↗