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Biomedical subjects

R von Krammer

Publications and source records attributed to R von Krammer.

At least 19 recordsLinked to original sources
PubMed2000

Cast posts that fit at first try.

The following article describes a procedure that permits the retention of a cast post that will fit passively in the canal at first try. By means of an indirect method, an elastic cast was poured in the master impression and an exact duplicate of the future dowel was formed with self-curing acrylic resin. A stone cast made from a second pour of the impression was then used to adjust the pattern in the laboratory. Posts made with the use of this system routinely sit passively in the root canal without the need of adjustments at the chair. The interval employed in obtaining and adjusting an acrylic resin pattern mentioned in the above way represents less time and effort than trying to make a cast fit in the canal, especially in the case of patients who require multiple posts in the same arch.

Acrylic Resins↗
PubMed1999

Procedure for obturating the access canal and preventing the loosening of the abutment screw in an implant-retained fixed prosthesis.

Silicone plugs used for obturating the access canal to retaining screws also act as antirotational devices for the screws; however, the procedures to obtain such an effect are complex and blind. The purpose of this article is to describe a method that would simplify the procedure and allow for checking of results. The proposed procedure is simple, efficient, and its results can be verified.

Dental Abutments↗
PubMed1997

A practical system for evaluating casting results in fixed restorations.

A practical and economical system of casting testers, formed by simple constituents that can be found anywhere, has been developed. Pattern formation is a quick procedure, and because the testers are small and imitate forms familiar to dental technicians, they can incorporate them easily into their daily work routine. Results can be interpreted without the use of any apparatus, because they are based on the principle of "all or nothing." The proposed system was field tested in 13 commercial dental laboratories, and the percentage of successes obtained affirmed that the goals of the procedure are attainable and valid.

Crowns↗
PubMed1996

A time-saving method for indirect fabrication of cast posts and cores.

Cast posts obtained from wax patterns often require tedious adjustments in the mouth to seat them passively in the prepared root canals. An indirect method that uses an elastic cast for the fabrication of resin patterns has been developed. A stone cast made from a second pour of the impression of the prepared canals is then used to adjust the patterns in the dental laboratory. Posts made with the use of this indirect method routinely seat in the root canals without adjustments at the chair. The procedure is especially useful for patients who require multiple posts in the same arch.

Acrylic Resins↗
PubMed1990

Avoidance of cast breakage during removal from the impression.

Breakage of a dental cast during its removal from the impression may result in inaccuracies in the finished appliance. The origin and prevention of the factors that can lead to cast breakage are found in the diagnostic phase. Casts of isolated teeth that are long, have marked gingival recession, and have a narrow clinical neck are prone to fracture. If casts of these types of teeth cannot be avoided, measures can be taken to prevent fracture. Wax can be used to thicken teeth with narrow clinical necks or to block out interproximal spaces in adjacent teeth without proximal contacts. The materials used to make the impressions and casts should also be chosen carefully. Methods of removing the cast to avoid fracture include the use of a soldering iron to cut the tray. Once the tray is sectioned, the impression material is free to elongate, and the cast can be removed easily.

Dental Casting Technique↗
PubMed1989

Accurately positioning a duplicate cast on the surveying table.

The path of insertion must be registered in such a way that it can be easily transmitted to the dental technician who then should also be able to transfer the original information from the master cast directly to any necessary duplicate casts. A system is presented that fulfills these requirements by means of simple tridimensional markings on the master cast, easily reproducible, and whose accuracy is not affected by the volumetric changes of duplicating and/or cast materials.

Dental Casting Technique↗
PubMed1988

A two-stage impression technique for distal-extension removable partial dentures.

Partially edentulous mouths with distal-extension ridges present the challenge of correctly registering two tissues as dissimilar as teeth and edentulous ridges. A technique is described that makes it possible to make impressions with a combination of different impression materials within the same tray and have a firm support that assures even distribution of the impression material and faithfulness of reproduction.

Dental Impression Materials↗
PubMed1988

An extrusion technique for handling autocuring acrylic resins.

The extrusion technique is a convenient way to place uncured resin material uniformly on flat and curved surfaces and establish precise borders. It prevents waste of material and avoids the contact of unpolymerized resin with the hands.

Acrylic Resins↗
PubMed1985

Reprints and photocopies as sources of information: how to make the best use of them.

The acquisition of information is a permanent endeavour in professional life. The strategies presented here will help dentists to perform this task expediently and with the least cost. A model for requesting reprints is suggested. It has evolved as a result of the writer's experience both as an author and a solicitor of information.

Copying Processes↗