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Biomedical subjects

H Nemetz

Publications and source records attributed to H Nemetz.

12 recordsLinked to original sources
PubMed1992

Effect of tray space on the accuracy of monophasic polyvinylsiloxane impressions.

The effect of tray space on the dimensional accuracy and stability of impressions made from four brands of monophasic polyvinyl siloxane material was assessed on the recovered stone casts by quantitative and qualitative methods. In general, both evaluation methods agreed that tray space and repeat pour did not affect the accuracy of the dies for individual castings. But disagreement was observed in the findings for fixed partial dentures (FPDs). Quantitative measurement of the interpreparation (IP) dimensions did suggest the possibility of a potential problem when a FPD is cast in one piece because of a significantly reduced distance between the two abutments. However, from the findings of this study it can be concluded that a rigid stock tray can be used with a monophasic polyvinyl siloxane impression material.

Analysis of Variance↗
PubMed1992

Effect of eugenol-containing endodontic sealer on retention of prefabricated posts luted with adhesive composite resin cement.

Reported studies have implicated eugenol in the reduction in retention of restorations luted with chemically cured composite resin cement. This study investigated the effect of residual eugenol in the root canal on the retention of ParaPost dowels cemented with Panavia EX composite resin. An attempt was also made to identify and to determine the most effective cleansing procedure. Findings of this study demonstrated a substantial decrease in retention of posts luted with Panavia composite resin cement in the presence of eugenol. Irrigation with ethyl alcohol (ethanol) or etching with 37% phosphoric acid gel was found to be effective in restoring the resistance to dislodgment of the posts, but alcohol produced the most consistent and reliable results.

Acetone↗
PubMed1991

The tilted molar: a prosthetic and periodontal dilemma.

The tilted molar presents both prosthetic and periodontal problems. Typically, the loss of a lower first molar or second premolar produces a space and allows the molar, distal to the space, to tilt mesially. The major tilting force is produced by the opposing occlusion. Although a tightly locked occlusion can prevent excessive movement, once the tooth begins to tilt, the vector of force tends to increase the tilting. The severity of both prosthetic and periodontal problems is directly related to the amount of tilting and treatment becomes complex when adjacent teeth begin to migrate.

Dental Abutments↗
PubMed1988

Reversible hydrocolloid: the standard of excellence.

Reversible hydrocolloid is the oldest elastic dental impression material and, with the appropriate methodology, the advantages outweigh the disadvantages. Skill, care, and comprehension of the physical properties of the materials ensure success.

Agar↗
PubMed1987

The efficacy of resin-compatible cavity varnishes in reducing dentin permeability to free monomer.

The effectiveness of three resin-compatible cavity varnishes in reducing the dentin permeability to free monomer liquid was evaluated by means of a dentin disk mounted within a pressurized split-chamber diffusion device filled with low-viscosity aliphatic dimethacrylate. Substantial reduction in dentin permeability was obtained with all of the products tested (Microjoin, Cavi-Line, and Universal). This study suggests their likely effectiveness as a protective barrier against permeation of free monomer into the dental pulp.

Collodion↗
PubMed1987

Bond strength of composite to metal mediated by metal adhesive promoters.

The effectiveness of three metal primers in promoting the adhesive bond of composites to alloy systems commonly used in making ceramometal restorations was investigated. The results of this study indicated that the bond strengths attained with these tested metal primers are in general not high. Further research is needed for the development of a metal primer with an improved adhesive strength. Until then, dentists should continue to use the current methods of undercutting and roughening the metal surface in order to achieve additional retention.

Adhesives↗
PubMed1985

Review and survey of medicaments used with gingival retraction cords.

Data from a survey of 495 dentists indicate that most dentists used the mechanical-chemical method of gingival-deflection; 79.39% of those used cord containing epinephrine. It can be concluded that potentially significant amounts of epinephrine can be absorbed systemically from the local anesthetic solution, that secretion of endogenous epinephrine in response to stress occurs, often at levels sufficient to cause measurable changes in hemodynamic variables, and that absorption of epinephrine from impregnated strings occurs. The amount of absorption will vary with the exposure of the vascular bed, the length and concentration of the impregnated cord, and the length of time of application. It is possible that the actual total amount of circulating catecholamine would be cumulative, and the corresponding cardiovascular response would be related to the total amount of epinephrine in the bloodstream, regardless of the source. When the fact that we usually have inadequate data on the cardiovascular status of our patients is considered, as well as the tendency to make impressions of multiple prepared teeth, the continued use of epinephrine cord in dentistry must be viewed with alarm. Equally effective astringent gingival deflection agents such as alum, aluminum sulfate, and aluminum chloride exert no systemic effects. Therefore, there is little indication for use of epinephrine-containing retraction cords. Adequate medical evaluation, careful use of anesthetics that contain epinephrine, and sedative techniques when indicated will assure the safety of our patients.

Adult↗
PubMedDate not supplied

Acute inositol does not attenuate m-CPP-induced anxiety, mydriasis and endocrine effects in panic disorder.

Many anti-panic drugs, administered chronically, can block pharmacologically-induced "panic attacks"; acutely they often exacerbate panic disorder. Theories of action need to account for this biphasic effect. Chronic inositol had previously shown efficacy against panic disorder. The authors investigated the effect of a single dose of 20 g inositol on an m-CPP challenge in a double-blind placebo-controlled crossover trial in panic-disorder patients. Seven patients had robust psychological, physiological and endocrine responses to 0.08 mg m-CPP i.v.; inositol had virtually no effect on these responses, although it had some acute effects during the evening before the challenge. A similar trial involving chronic inositol would be of interest.

Anti-Anxiety Agents↗