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Biomedical subjects

R K Fenster

Publications and source records attributed to R K Fenster.

9 recordsLinked to original sources
PubMed1990

The effect of three different surface treatments on the tensile strength of the resin bond to nickel-chromium-beryllium alloy.

The effect of three different metal surface treatments on the tensile strength of the resin bond to non-noble nickel-chromium-beryllium alloy was studied by bonding metal to metal. Chemical etching of the metal for 1 hour obtained the highest strength, followed by air-abraded bond specimens. Lowest strength was obtained with the gel-etch method. All resulted in clinically acceptable values.

Acid Etching, Dental↗
PubMed1981

A comparative study of the centrifugal and vacuum-pressure techniques of casting removable partial denture frameworks.

A study was undertaken to evaluate two techniques for casting accuracy on removable partial denture frameworks: centrifugal casting and vacuum-pressure casting. A standard metal die with predetermined reference points in a horizontal plane was duplicated in refractory investment. The casts were waxed, and castings of nickel-chrome alloy were fabricated by the two techniques. Both the casts and the castings were measured between the reference points with a measuring microscope. With both casting methods, the differences between the casts and the castings were significant, but no significant differences were found between castings produced by the two techniques. Vertical measurements at three designated points also showed no significant differences between the castings. Our findings indicate that dental laboratories should be able to use the vacuum-pressure method of casting removable partial denture frameworks and achieve accuracy similar to that obtained by the centrifugal method of casting.

Chromium↗
PubMed1980

An occlusal prosthesis to assure airway patency in the comatose patient.

Ruminatory reflex chewing activities in the comatose patient and the associated prostheses used in their treatment have been well documented in the literature. The comatose patient, whose condition is further complicated by the need for oral-endotracheal intubation, requires the aid of a prosthesis which will allow for long-term patency of the tube to maintain proper ventilation.

Adult↗
PubMed1980

Vital root retention in humans: a final report.

A research protocal for submucosal vital root retention in humans has been developed based on laboratory animal studies. Procedures, patient management, and statistical results have been reported in a series of three articles. Changes in techniques have also been reported, along with explanation of a flowchart for tooth root retention and alveolar ridge preservation. Some ideas for future investigations are presented. Vital root retention in humans appears to be a valid means of retaining residual bony ridge tissues to a greater degree than when patients are rendered totally edentulous.

Alveolar Process↗
PubMed1979

Vital root retention in humans: an interim report.

A protocol based upon findings in laboratory animal studies was established for the retention of vital roots for overdenture support in humans. Ten patients with a mean age of 54.5 years and a postsurgical mean time of 11.1 months had 45 vital teeth buried submucosally under complete overdentures. Of the 45 teeth, 37 remained vital, seven were endodontically treated due to acute pulpal response following surgery, and one tooth has been extracted. A mean interproximal bone loss of 1.1 mm had occurred at the time the data were tabulated for this report. This project included a cross section of patient types, tooth selection, and surgical and prosthodontic management that varied slightly from the methods utilized in earlier patient treatment. The inclusion of maxillary teeth, the increased thoroughness of root surface roundings, and the utilization of root canal therapy with subsequent reburying of apulpally involved teeth expanded the scope of this research. A final report on this project will be forthcoming when all patients have been followed for a 24-month period.

Adult↗
PubMed1979

The effect of various clasping systems on the mobility of abutment teeth for distal-extension removable partial dentures.

Three clasping systems were placed in five patients, and measurements of abutment tooth mobility were made. These data were compared to previously established baselines and statistically analyzed. The findings of the study are: 1. There was no difference in abutment tooth mobility during the 4-week test period with each of the three clasping systems. The important factor may have been the fit of the distal-extension denture base over the residual ridge, which provides the stability to prevent increases in abutment mobility. 2. Any mobility increases were in a buccal direction only, or toward the flexible retentive clasp arm. There was never any change in lingual mobility. 3. All five patients chose the I-bar retainer as the design of choice due to its increased resistance to dislodgment. Periodic recall of distal-extension removable partial denture patients is mandatory to ensure proper stress distribution and prevent increases in abutment tooth mobility.

Dental Abutments↗
PubMed1978

Vital root retention in humans: a preliminary report.

With increasing experience in the technique, it has become apparent that more generous contouring of the retained root after amputation is desirable. The effect is to produce a more rounded ridge instead of the "boxy" one that would result from mere horizontal sectioning of the crown structure. The surgical sectioning of vital teeth, followed by anequate mucoperiosteal eversion suturing, has proved to be successful. Periodontal evaluation of each tooth seems to be paramount to success or failure. Accurate impression-making and postsurgical treatment including soft acrylic resin relines and removal of pressure spots appear to be next in importance. Age of the patient, condition of the clinical crowns, and length of surgical procedures did not seem to affect normal healing in the patients involved in the project.

Adult↗
PubMedDate not supplied

Dimensional accuracy of two denture base processing methods.

The mucosal surfaces of maxillary complete dentures processed using the SR-Ivocap injection technique and the Lucitone heat-polymerized compression molding technique were compared to a metal master impression to determine if one method of denture processing produced a more accurate denture base. Comparisons were made before and after polishing the prepared bases to determine if changes occur as a result of this procedure. The dental comparator, described by Rupp and others in 1957, was used to compare selected points on the palatal surface of the denture bases. No statistical differences were found in the accuracy of the denture bases processed using either of the two techniques.

Dental Casting Technique↗